Gilroy Weather
Town • San Francisco Bay Area
Gilroy is the southernmost city in Santa Clara County, at the bottom of the valley. Highway 101 meets the roads over Hecker Pass to the coast and Pacheco Pass to the Central Valley here. Its visitor bureau calls it the crossroads of the Bay Area, Central Coast, and Central Valley. The town is known for garlic, a historic walkable downtown, Gilroy Gardens on Hecker Pass Highway, and the Gilroy Premium Outlets.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Gilroy weather today and through the year
It's 51°F at Gilroy right now (feels like 48°F), with 3 mph wind and a comfort score of 75. Monday's forecast high at Gilroy is 56°F, 11°F below the mid November normal of 67°F. No fog in the forecast for today at Gilroy. In November, 12% of morning hours here are foggy on average. The best window today is 8 AM to 11 AM, at about 61°F with a 5 mph wind (comfort 84).
August is the warmest month at Gilroy, with an average high of 84°F. December is the coldest, with an average low of 38°F. January is the wettest month (4.3 in.), out of about 19.7 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Gilroy are June, September, and July. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in July.
Gilroy is the closest Santa Clara Valley city to Monterey Bay, and that shapes its afternoons. The Pajaro River cuts a low gap through the hills to the south. On summer days the sea breeze pushes up that gap from Watsonville and spills into the south end of the valley. Afternoons get hot, but the breeze often arrives late in the day and cools the evenings.
Forecast updated November 15, 2026 at 4:00 AM PST. Climate figures come from NOAA 1991-2020 normals. Hourly patterns come from NOAA's HRRR hourly analysis from September 2014 to April 2026.
What to expect at Gilroy in the next few days
No active National Weather Service alerts for this location.
Fog
No fog in the forecast for today at Gilroy. In November, 12% of morning hours here are foggy on average.
Best time to go
The best window today is 8 AM to 11 AM, at about 61°F with a 5 mph wind (comfort 84).
Best day this week
Of the next 7 days, Friday looks best for Gilroy, with a 59°F high and midday comfort near 73. Wednesday looks weakest (45).
Rain
Next good chance of rain: Monday (95%, about 0.36 in.).
Live weather map
Weather around Gilroy right now
Overcast and 51° at Gilroy right now.
About the live weather map for Gilroy
The map centers on Gilroy and stacks fog, satellite clouds, and precipitation radar on one view. Clouds come from the GOES-West satellite and rain from NOAA radar, and both show current conditions. Fog comes from our HRRR-based fog model, and the slider steps through its forecast for the next 12 hours.
Dots mark nearby places with their current temperature, colored by comfort score. Use the layer buttons to turn any layer off, or open the full map for every destination in the region.
Nearby Temperature Comparison
Conditions at nearby San Francisco Bay Area destinations
Tip: Bay Area temperatures can change by 20 to 30°F over a short distance because of microclimates.
Gilroy vs nearby places
Typical summer conditions compared with Gilroy, from the same NOAA HRRR hourly record. The list shows the closest places, then nearby places whose climate differs the most.
| Place | Distance | Summer afternoons | Morning fog | Afternoon wind | Compared with Gilroy |
|---|---|---|---|---|---|
| Morgan Hill | 9.8 mi | +1°F | 25% | 8 mph | a very similar climate |
| Watsonville | 12.3 mi | -16°F | 34% | 9 mph | about 16°F cooler on summer afternoons and more summer morning fog (34% vs 15% of morning hours) |
| Henry W. Coe State Park | 12.6 mi | same | 12% | 11 mph | about 56% more rain a year and windier summer afternoons (11 vs 6 mph) |
| Capitola | 21.3 mi | -15°F | 36% | 8 mph | about 15°F cooler on summer afternoons and more summer morning fog (36% vs 15% of morning hours) |
| Scotts Valley | 24.8 mi | -8°F | 46% | 7 mph | about 88% more rain a year and more summer morning fog (46% vs 15% of morning hours) |
| Santa Cruz Main Beach | 25 mi | -18°F | 33% | 12 mph | about 18°F cooler on summer afternoons and windier summer afternoons (12 vs 6 mph) |
Places with a climate like Gilroy's
- Sunnyvale (36 mi away): nearly the same temperatures every month
- Cupertino (34 mi away): nearly the same temperatures every month
- Rancho San Antonio (36 mi away): nearly the same temperatures every month
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Gilroy climate comparisons mean
These cards compare recent conditions at Gilroy with the available local baseline. Temperature and year-to-date rainfall use long-term normals when available. Fog, sunshine, wind, and comfort use the matching recent or modeled baseline identified on each card.
Positive and negative differences describe how Gilroy departs from its own usual pattern. They should not be read as a direct comparison with another city or as a forecast beyond the period shown.
Gilroy weather by month
August is the warmest month at Gilroy, with an average high of 84°F. December is the coldest, with an average low of 38°F. January is the wettest month (4.3 in.), out of about 19.7 in. a year. Morning fog peaks in December, when fog or low cloud covers 23% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 6% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Gilroy are June, September, and July. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in July.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 61°F | 39°F | 4.3 in | 9 | 16% | 26% | 5 mph | 9.9 h | 63 |
| Feb | 64°F | 41°F | 3.8 in | 8 | 13% | 21% | 6 mph | 10.8 h | 65 |
| Mar | 67°F | 43°F | 3.1 in | 7 | 13% | 25% | 7 mph | 11.9 h | 70 |
| Apr | 71°F | 45°F | 1.3 in | 5 | 11% | 22% | 7 mph | 13.1 h | 78 |
| May | 75°F | 49°F | 0.5 in | 3 | 10% | 18% | 8 mph | 14.2 h | 81 |
| Jun | 80°F | 53°F | 0.1 in | 1 | 12% | 9% | 7 mph | 14.7 h | 85 |
| Jul | 83°F | 56°F | 0.0 in | 0 | 17% | 6% | 6 mph | 14.4 h | 83 |
| Aug | 84°F | 56°F | 0.1 in | 1 | 17% | 7% | 6 mph | 13.5 h | 83 |
| Sep | 83°F | 53°F | 0.1 in | 1 | 13% | 10% | 6 mph | 12.3 h | 85 |
| Oct | 78°F | 49°F | 0.9 in | 4 | 10% | 11% | 5 mph | 11.1 h | 82 |
| Nov | 67°F | 42°F | 1.8 in | 6 | 12% | 15% | 5 mph | 10.1 h | 80 |
| Dec | 60°F | 38°F | 3.8 in | 8 | 23% | 26% | 5 mph | 9.6 h | 62 |
Morning fog is the share of hours from 6 to 10 AM with fog or low cloud. Midday cloud is the average from 11 AM to 3 PM, and afternoon wind is the average from 1 to 5 PM. The highlighted rows are the most comfortable months.
What makes Gilroy's weather different
Among the 163 San Francisco Bay Area towns we track, Gilroy has the 2nd-calmest summer afternoons.
- #2of 163
calmest summer afternoonsamong San Francisco Bay Area towns
When the fog burns off
11 AMwhen December fog usually thins (26% foggy at 8 AM)
Fog or low cloud covers Gilroy in 26% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 11 AM. May mornings are the least foggy (10%).
When the wind picks up
2 PMwhen afternoon wind builds, March–October
From March through October, wind at Gilroy typically builds after 2 PM. In May it peaks around 4 PM, averaging 9 mph with 3% of those hours windy, while mornings average 4 mph.
Hot hours
3 habove 85°F on a typical August afternoon
In August, the average temperature stays at or above 85°F for 3 hours a day.
Daylight
9.6–14.7 hof daylight, Dec to Jun
Days at Gilroy range from about 9.6 hours in December to 14.7 hours in June. In mid-June the sun sets around 8:27 PM, and in mid-December around 4:54 PM.
Seasons at Gilroy
- Warm seasonJun 28 – Sep 28 · highs 81°F+
The warm season lasts about 3.1 months, from Jun 28 to Sep 28, when the average high is 81°F or warmer. Highs peak around Aug 8 at about 84°F.
- Cool seasonNov 28 – Feb 26 · highs 65°F or lower
The cool season runs from Nov 28 to Feb 26, when the average high is 65°F or lower. The coldest nights come around Dec 8, with an average low near 38°F.
- Rainy seasonNov 20 – Mar 31 · 79% of the year's rain
The rainy season runs from Nov 20 to Mar 31, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain.
The dark line marks today. Season dates come from the smoothed daily NOAA 1991-2020 normals. Counting from Oct. 1, a typical year has its first inch of rain by Nov 3 and half of its annual total by Jan 25.
Days per year and extremes (Nov 1, 2024 to Oct 31, 2026)
This record runs from Nov 1, 2024 to Oct 31, 2026. Over this record, Gilroy averaged 33 days a year at 90°F or hotter and 8 nights a year at or below freezing. It averaged 12 days a year with at least half an inch of rain and 0 afternoons with wind of 20 mph or more at 2 PM. About 73 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (105°F) and the coldest night was Jan 28, 2025 (26°F). The wettest day was Feb 14, 2025 (2.72 in.), and the strongest 2 PM gust was 34 mph on Feb 13, 2025.
- 33days at 90°F or hotter
- 8nights at or below freezing
- 12days with ½ in. of rain or more
- 0afternoons with 20+ mph wind
- 73mornings with 3+ hours of fog or low cloud
- Hottest day105°FSep 9, 2026
- Coldest night26°FJan 28, 2025
- Wettest day2.72 inFeb 14, 2025
- Strongest 2 PM gust34 mphFeb 13, 2025
What shapes Gilroy's weather
Hecker Pass and Mount Madonna block most of the marine layer, the sheet of low cloud that forms over the cold ocean, to the west. The fog that sits over Watsonville and the Pajaro Valley in the morning usually stops short of town. When the onshore push is strong, low clouds do sometimes slip through the gap and give Gilroy a gray start.
The Diablo Range to the east is the source of Gilroy's driest weather. During fall offshore events, when wind blows from the interior toward the coast, hot, dry air comes down through the Pacheco Pass area. It brings the driest air of the year and raises fire danger in the surrounding hills.
Winter nights can be cold. On clear, calm nights cold air settles on the flat valley floor and the outlying fields. Dawn is often much colder than the afternoon, and frost is common. The city's storm-safety page warns that winter systems can bring heavy rain, strong wind, flooding, landslides, and power outages.
Tips for visiting Gilroy
Know where to cool off
During extreme heat, Santa Clara County may open cooling centers, and the Gilroy Library at 350 W. 6th Street typically serves as one during regular hours.
Sign up for local alerts
The city posts emergency notices through Nixle and points residents and visitors to AlertSCC for countywide warnings.
Avoid flooded roads in storms
Heavy rain can flood or block roads and cause power outages and landslides. Check 511 for road conditions before driving the passes.
Plan Caltrain trips around commute runs
Gilroy's Caltrain timetable shows trains heading north in the early morning and returning south in the evening, so plan a day trip around that pattern.
Shop and eat indoors in the afternoon
Summer afternoons are the hottest part of the day. Save the outlets, tasting rooms, and downtown restaurants for the heat of the day and go outside early or late.
Gilroy through the seasons
- Spring (March–May)
- Spring brings green hills and mild days, with the afternoon Monterey Bay breeze getting stronger as the season goes on.
- Summer (June–August)
- Summer is hot and dry, with a late-day breeze off Monterey Bay that cools the evenings.
- Fall (September–October)
- Heat can return in September and early October when the sea breeze weakens or offshore wind sets up. Fire danger stays high until the first rain.
- Winter (November–February)
- Winter is the rainy season, with occasional flooding and frosty cold snaps. Santa Clara County may open warming centers in severe cold, and the Gilroy Library is typically one during business hours.
Activities and the weather that matters
- Gilroy Gardens: The park is a full outdoor day, most comfortable in spring, early summer mornings, or after the late-afternoon breeze arrives.
- Wine tasting on Hecker Pass and in Uvas Valley: Warm, dry fall days are classic tasting weather. In midsummer, aim for late afternoon, after the breeze arrives.
- Outlet shopping: The outlets are a good choice on the hottest afternoons, but parking lots are exposed to full sun.
Official sources and current conditions
- Visit Gilroy
- City of Gilroy: Hot Weather Safety
- City of Gilroy: Storm and Cold Weather Safety
- Caltrain: Gilroy station
Numbers on this page come from NOAA data. The text draws on the official sources linked above.
Historical Climate Data
Long-term weather patterns and climate data
Data sources: Recent temperatures come from NOAA URMA and recent precipitation from NOAA Stage IV. Fog, cloud, wind, humidity, and sunshine come from NOAA HRRR, and long-term baselines from NOAA 1991-2020 climate normals.
Climate Overview
Based on NOAA 30-year temperature/rain normals (1991-2020) with recent fog/sun baseline
🌟 Best Months to Visit
⚠️ Challenging Months
Monthly Breakdown
| Month | Comfort | High/Low | ☀️ Sun | 🌫️ Fog | 💧 Rain | Perfect |
|---|---|---|---|---|---|---|
| November 2024 | 84 | 66.5° / 42° | 6.7h | 2d | 2.9" | 24 |
| December 2024 | 77 | 64° / 42.3° | 5.5h | 9d | 3.51" | 16 |
| January 2025 | 87 | 63.3° / 35.8° | 7.2h | 2d | 0.18" | 26 |
| February 2025 | 81 | 64.3° / 42.5° | 7h | 2d | 6.51" | 17 |
| March 2025 | 84 | 64.5° / 44° | 8.2h | 3d | 3.43" | 22 |
| April 2025 | 92 | 69.6° / 46.8° | 9.8h | 5d | 0.54" | 28 |
| May 2025 | 93 | 78.9° / 50.2° | 11.8h | 0d | 0.06" | 30 |
| June 2025 | 95 | 81.3° / 51.3° | 12.4h | 2d | 0" | 30 |
| July 2025 | 93 | 81.2° / 54.8° | 11.6h | 5d | 0" | 31 |
| August 2025 | 89 | 88.3° / 56.4° | 11h | 2d | 0" | 28 |
| September 2025 | 89 | 84° / 59.5° | 9.7h | 2d | 0.69" | 26 |
| October 2025 | 90 | 75.8° / 51.4° | 8.1h | 2d | 1.19" | 29 |
| November 2025 | 80 | 67.8° / 47.1° | 6.6h | 6d | 4.44" | 18 |
| December 2025 | 79 | 62.5° / 43.9° | 5.8h | 11d | 2.33" | 16 |
| January 2026 | 86 | 65.7° / 40.3° | 7.2h | 2d | 3.29" | 25 |
| February 2026 | 81 | 67.5° / 43.8° | 6.6h | 5d | 5.27" | 18 |
| March 2026 | 93 | 80.9° / 48.6° | 9.8h | 1d | 0.02" | 30 |
| April 2026 | 90 | 72.1° / 48.2° | 9.7h | 1d | 2.55" | 26 |
| May 2026 | 94 | 76.7° / 51.8° | 11.5h | 2d | 0.39" | 30 |
| June 2026 | 94 | 81.6° / 54.7° | 12.2h | 0d | 0" | 30 |
| July 2026 | 92 | 86.2° / 57.2° | 11.5h | 0d | 0" | 29 |
| August 2026 | 91 | 85.8° / 57.8° | 10.9h | 1d | 0" | 30 |
| September 2026 | 91 | 83.5° / 55.4° | 10h | 0d | 0.02" | 27 |
| October 2026 | 86 | 81.7° / 51.6° | 8.5h | 1d | 0.28" | 22 |
Climate Trends
Average Temperature by Month
About the Gilroy climate charts
The temperature chart compares average monthly highs and lows at Gilroy, showing both the seasonal cycle and the typical day-to-night range. The comfort chart summarizes how often the combined weather pattern is favorable rather than judging temperature alone.
Precipitation shows the total recorded or modeled rainfall for each month at Gilroy. Sunshine compares average bright-sky hours with the daylight available, while fog shows the average number of morning fog or low-cloud hours per day. Switch between the chart tabs to compare the same months across each measure.
Hourly Temperature, Fog, Wind, Cloud Cover, and Solar Radiation Patterns
Average local hour by month from 2014-09-30 to 2026-04-30
- Temperature: At Gilroy, the warmest typical hour is 3 PM in August (86°F). The coldest is 7 AM in January (43°F).
- Fog: Fog or low cloud covers Gilroy in 26% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 11 AM. May mornings are the least foggy (10%).
- Wind: From March through October, wind at Gilroy typically builds after 2 PM. In May it peaks around 4 PM, averaging 9 mph with 3% of those hours windy, while mornings average 4 mph.
- Cloud Cover: July middays are the clearest at Gilroy (6% average cloud cover), and January middays are the cloudiest (26%).
- Solar Radiation: The strongest typical sun at Gilroy comes at 1 PM in July, averaging 1005 W/m².
How to read the hourly heatmaps for Gilroy
This heatmap shows how average temperature at Gilroy changes by hour and month. Read left to right for the seasons and top to bottom for the time of day. Warmer colors mark the usual afternoon peaks, and cooler colors show overnight and winter lows.
This heatmap shows when fog or low cloud is most likely at Gilroy. Darker cells mark the months and hours when fog has been most common. They help separate overnight or morning fog from cloud that tends to linger into the afternoon.
This heatmap shows the typical hourly wind pattern at Gilroy through the year. It makes recurring afternoon wind, calmer overnight periods, and seasonal changes easier to compare than a single daily wind value.
This heatmap shows average cloud cover at Gilroy for every month and hour. Use it to see whether cloudiness is mainly an overnight and morning pattern or commonly persists during the part of the day you plan to visit.
This heatmap shows the average solar radiation reaching Gilroy by month and hour. Brighter cells indicate the strongest typical sun, while muted cells can reflect nighttime, shorter winter days, cloud cover, smoke, or terrain shading.
Each cell combines one month with one local hour. Hover over or focus on a cell for its value and sample coverage. The red marker shows the current month and hour.
How recent months compared at Gilroy
- October 2026 recap: October 2026 at Gilroy averaged a high of 82°F, 4°F warmer than the 1991-2020 normal of 78°F. It brought 0.28 in. of rain, compared with a normal of 0.88 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 19.5 in. of rain to Gilroy, 99% of the 19.7 in. normal.
Location Details
Gilroy weather questions
Everything you need to know about weather and visiting Gilroy
What is the weather like at Gilroy today?
It's 51°F at Gilroy right now, with a comfort score of 75 (great). Monday's forecast high at Gilroy is 56°F, 11°F below the mid November normal of 67°F. The best window today is 8 AM to 11 AM, at about 61°F with a 5 mph wind (comfort 84).
What is the best month to visit Gilroy?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Gilroy are June, September, and July. The best hours are usually 10 AM to 1 PM in June, 10 AM to 1 PM in September, and 10 AM to 1 PM in July. The warm season lasts about 3.1 months, from Jun 28 to Sep 28, when the average high is 81°F or warmer. Highs peak around Aug 8 at about 84°F.
What are the warmest and coldest months at Gilroy?
August is the warmest month at Gilroy, with an average high of 84°F. December is the coldest, with an average low of 38°F.
When does the fog burn off at Gilroy?
Fog or low cloud covers Gilroy in 26% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 11 AM. May mornings are the least foggy (10%).
When is it windiest at Gilroy?
From March through October, wind at Gilroy typically builds after 2 PM. In May it peaks around 4 PM, averaging 9 mph with 3% of those hours windy, while mornings average 4 mph.
How much rain does Gilroy get?
January is the wettest month (4.3 in.), out of about 19.7 in. a year. The rainy season runs from Nov 20 to Mar 31, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 19.5 in. of rain to Gilroy, 99% of the 19.7 in. normal.
What kind of place is Gilroy?
Gilroy is the southernmost city in Santa Clara County, at the bottom of the valley. Highway 101 meets the roads over Hecker Pass to the coast and Pacheco Pass to the Central Valley here. Its visitor bureau calls it the crossroads of the Bay Area, Central Coast, and Central Valley. The town is known for garlic, a historic walkable downtown, Gilroy Gardens on Hecker Pass Highway, and the Gilroy Premium Outlets.
What is Gilroy weather like in November?
November at Gilroy averages a high of 67°F and a low of 42°F, with 1.8 in. of rain over about 6 rainy days. About 12% of morning hours are foggy. Afternoon wind averages 5 mph.
More about Gilroy weather
Guides that explain the weather here and nearby
Data sources and methods
- Monthly temperatures and precipitation: NOAA 1991-2020 normals.
- Fog, cloud, wind, sun, and comfort by hour and month: NOAA's HRRR hourly analysis from September 2014 to April 2026.
- Daily records and recent months: NOAA URMA and HRRR analyses, plus NOAA Stage IV precipitation.
- Nearby comparisons and regional rankings use the same hourly HRRR summaries for every destination in the region.
- Alerts: National Weather Service. Tides and ocean temperature: NOAA CO-OPS, where shown.
- All statements on this page are computed from these datasets, apart from the “What shapes the weather” guide, which cites its sources inline.
- City of Gilroy, Hot Weather Safety (accessed 2026-10-27)
- City of Gilroy, Storm and Cold Weather Safety (accessed 2026-10-27)
- Caltrain, Gilroy station timetable (accessed 2026-10-27)
- Visit Gilroy (official visitor site) (accessed 2026-10-27)
Rendered 2026-11-15T12:16:20.840Z.