San Bruno Weather
Town • San Francisco Bay Area
San Bruno climbs from the flats beside SFO and El Camino Real up a series of hillside neighborhoods toward Skyline Boulevard. Above them is Sweeney Ridge, the National Park Service ridge it shares with Pacifica. Interstate 380 cuts through the middle of town on its way from Interstate 280 to the airport. The BART station sits beside the Tanforan shopping center, and San Mateo County's Junipero Serra Park, off Crystal Springs Road, looks out over the runways and the bay.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
San Bruno weather today and through the year
It's 53°F at San Bruno right now (feels like 50°F), with 4 mph wind and a comfort score of 77. Monday's forecast high at San Bruno is 57°F, 6°F below the mid November normal of 63°F. The best window today is 8 AM to 11 AM, at about 55°F with a 5 mph wind (comfort 58).
September is the warmest month at San Bruno, with an average high of 71°F. January is the coldest, with an average low of 45°F. December is the wettest month (4.8 in.), out of about 23.1 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at San Bruno are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 11 AM to 2 PM in August, and 11 AM to 2 PM in July.
San Bruno occupies the south side of the San Bruno Gap, the low pass between San Bruno Mountain and Sweeney Ridge that lets ocean air cross the Peninsula. On summer afternoons the sea breeze comes in off the coast, crosses the saddle, and runs down through town toward the bay. That makes San Bruno windier and cooler than Burlingame or San Mateo a few miles south, where higher hills block the flow.
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 San Bruno in the next few days
No active National Weather Service alerts for this location.
Best time to go
The best window today is 8 AM to 11 AM, at about 55°F with a 5 mph wind (comfort 58).
Best day this week
Of the next 7 days, Friday looks best for San Bruno, with a 61°F high and midday comfort near 80. Thursday looks weakest (47).
Rain
Next good chance of rain: today (74%, about 0.28 in.).
Live weather map
Weather around San Bruno right now
Overcast and 53° at San Bruno right now.
About the live weather map for San Bruno
The map centers on San Bruno 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.
San Bruno vs nearby places
Typical summer conditions compared with San Bruno, 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 San Bruno |
|---|---|---|---|---|---|
| South San Francisco | 1.7 mi | -2°F | 20% | 13 mph | a very similar climate |
| Millbrae | 2.6 mi | +2°F | 13% | 10 mph | a very similar climate |
| Burlingame | 4 mi | +3°F | 9% | 9 mph | a very similar climate |
| Montara | 8.4 mi | -14°F | 60% | 8 mph | more summer morning fog (60% vs 15% of morning hours) and about 14°F cooler on summer afternoons |
| Moss Beach | 9 mi | -13°F | 66% | 9 mph | more summer morning fog (66% vs 15% of morning hours) and about 13°F cooler on summer afternoons |
| Half Moon Bay | 11.6 mi | -8°F | 64% | 8 mph | more summer morning fog (64% vs 15% of morning hours) and about 8°F cooler on summer afternoons |
Places with a climate like San Bruno's
- Sausalito (16 mi away): nearly the same temperatures every month
- Corte Madera (21 mi away): nearly the same temperatures every month
- Ring Mountain Preserve (20 mi away): nearly the same temperatures every month
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the San Bruno climate comparisons mean
These cards compare recent conditions at San Bruno 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 San Bruno 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.
San Bruno weather by month
September is the warmest month at San Bruno, with an average high of 71°F. January is the coldest, with an average low of 45°F. December is the wettest month (4.8 in.), out of about 23.1 in. a year. Morning fog peaks in December, when fog or low cloud covers 17% of the hours from 6 to 10 AM. October has the clearest middays, with clouds covering about 24% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at San Bruno are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 11 AM to 2 PM in August, and 11 AM to 2 PM in July.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 58°F | 45°F | 4.5 in | 9 | 13% | 36% | 5 mph | 9.9 h | 58 |
| Feb | 60°F | 46°F | 4.5 in | 9 | 9% | 29% | 7 mph | 10.7 h | 61 |
| Mar | 62°F | 48°F | 3.3 in | 7 | 9% | 33% | 9 mph | 11.9 h | 64 |
| Apr | 64°F | 49°F | 1.6 in | 5 | 8% | 30% | 11 mph | 13.2 h | 70 |
| May | 66°F | 51°F | 0.7 in | 3 | 9% | 35% | 12 mph | 14.2 h | 71 |
| Jun | 68°F | 53°F | 0.2 in | 2 | 13% | 26% | 12 mph | 14.8 h | 80 |
| Jul | 69°F | 55°F | 0.0 in | 1 | 17% | 30% | 11 mph | 14.5 h | 83 |
| Aug | 70°F | 56°F | 0.1 in | 1 | 16% | 28% | 11 mph | 13.6 h | 86 |
| Sep | 71°F | 55°F | 0.1 in | 1 | 12% | 28% | 10 mph | 12.3 h | 89 |
| Oct | 69°F | 53°F | 1.1 in | 4 | 9% | 24% | 8 mph | 11.1 h | 83 |
| Nov | 63°F | 49°F | 2.4 in | 6 | 9% | 26% | 6 mph | 10.1 h | 69 |
| Dec | 58°F | 45°F | 4.8 in | 9 | 17% | 38% | 5 mph | 9.6 h | 57 |
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 San Bruno's weather different
Among the 163 San Francisco Bay Area towns we track, San Bruno has the 3rd-mildest winter nights.
- #3of 163
mildest winter nightsamong San Francisco Bay Area towns
When the fog burns off
2 PMwhen December fog usually thins (20% foggy at 9 AM)
Fog or low cloud covers San Bruno in 20% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. April mornings are the least foggy (8%).
When the wind picks up
1 PMwhen afternoon wind builds, February–October
From February through October, wind at San Bruno typically builds after 1 PM. In June it peaks around 5 PM, averaging 13 mph with 27% of those hours windy, while mornings average 5 mph.
Microclimate
−14°FMontara, 8.4 mi away, on summer afternoons
Montara, 8.4 miles away, runs about 14°F cooler than San Bruno on summer afternoons. It also has far more summer morning fog, 60% of morning hours compared with 15%.
Daylight
9.6–14.8 hof daylight, Dec to Jun
Days at San Bruno range from about 9.6 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:34 PM, and in mid-December around 4:58 PM.
Seasons at San Bruno
- Warm seasonJul 8 – Oct 24 · highs 69°F+
The warm season lasts about 3.6 months, from Jul 8 to Oct 24, when the average high is 69°F or warmer. Highs peak around Sep 8 at about 71°F.
- Cool seasonNov 29 – Feb 28 · highs 61°F or lower
The cool season runs from Nov 29 to Feb 28, when the average high is 61°F or lower. The coldest nights come around Jan 8, with an average low near 45°F.
- Rainy seasonNov 12 – Apr 5 · 81% of the year's rain
The rainy season runs from Nov 12 to Apr 5, when a day has at least a 20% chance of measurable rain. That stretch brings 81% 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 Oct 30 and half of its annual total by Jan 24.
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, San Bruno averaged no days at 90°F or hotter and no freezing nights. It averaged 15 days a year with at least half an inch of rain and 3 afternoons with wind of 20 mph or more at 2 PM. About 66 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Oct 3, 2026 (86°F) and the coldest night was Feb 10, 2025 (44°F). The wettest day was Nov 23, 2024 (2.84 in.), and the strongest 2 PM gust was 49 mph on Mar 12, 2025.
- 0days at 90°F or hotter
- 0nights at or below freezing
- 15days with ½ in. of rain or more
- 3afternoons with 20+ mph wind
- 66mornings with 3+ hours of fog or low cloud
- Hottest day86°FOct 3, 2026
- Coldest night44°FFeb 10, 2025
- Wettest day2.84 inNov 23, 2024
- Strongest 2 PM gust49 mphMar 12, 2025
What shapes San Bruno's weather
San Bruno spans a lot of elevation, and that splits its weather. The western neighborhoods up toward Skyline Boulevard and Sweeney Ridge sit near the top of the marine layer, the cool, damp ocean air that carries summer fog. They often stay misty or drizzly on summer mornings, while the flats near El Camino and the airport tend to clear sooner. On many evenings the overcast returns first to the hilltops.
Sweeney Ridge catches the full force of the sea breeze above San Bruno. Its exposed summit can be clear and sunny or wrapped in cloud, depending on how deep the layer of ocean air is that day. Conditions can change within an afternoon.
In fall the sea breeze weakens, and September brings San Bruno its warmest days. Winter storms bring heavier rain to the upper hillsides than to the bayside flats.
Tips for visiting San Bruno
Pack sunscreen and a layer for Sweeney Ridge
The park service says most trails are fully exposed. If it is cold and cloudy, bring an extra layer and expect wind, since weather often changes over an afternoon.
Start from Sneath Lane
San Bruno's access to Sweeney Ridge is via Sneath Lane to the Sneath Trail. Other routes start at Skyline College or on the Pacifica side.
Watch planes from Quail Loop
The 1.1-mile Quail Loop Trail in Junipero Serra Park climbs about 220 feet to views of the bay, SFO, and Mount Diablo.
Ride BART to Tanforan
San Bruno BART is next to the Tanforan shopping center and business district, with SamTrans buses at the station.
San Bruno through the seasons
- Spring (March–May)
- Hills turn green and the afternoon gap wind starts to build. Clear spring mornings give the best long views from Sweeney Ridge.
- Summer (June–August)
- Summer is often gray, breezy, and cool, especially on the upper hillsides. The airport flats often clear by midday while the ridge stays in cloud.
- Fall (September–October)
- Fall is San Bruno's warmest and calmest stretch, and the most reliable time for clear views of the bay from the ridges.
- Winter (November–February)
- Rain arrives with southerly winds ahead of storms. Sweeney Ridge's trails are fully exposed, so bring layers for wind and cold.
Activities and the weather that matters
- Hiking Sweeney Ridge: A clear, calm day gives views to both the ocean and the bay from the roughly 1,200-foot summit. Fog and wind can roll in by afternoon.
- Visiting the Portolá Discovery Site: The ridgetop monument marks where Portolá's expedition first saw San Francisco Bay. You need a clear day to see what they saw.
- Picnics in Junipero Serra Park: The park's hillside views reach San Bruno Mountain, SFO, the bay, and Mount Diablo. Go on a sunny, low-wind day.
- Shopping at Tanforan: The shopping center is an easy indoor fallback on cold, windy, or rainy days.
Official sources and current conditions
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 | 79 | 59.8° / 52° | 6.5h | 3d | 4.45" | 19 |
| December 2024 | 70 | 58° / 50.8° | 5.2h | 10d | 5.32" | 12 |
| January 2025 | 82 | 57.4° / 48.4° | 6.5h | 2d | 0.16" | 21 |
| February 2025 | 75 | 58.2° / 49° | 6.7h | 6d | 6.2" | 12 |
| March 2025 | 81 | 58.6° / 49.9° | 8.5h | 1d | 1.81" | 21 |
| April 2025 | 87 | 61° / 51.2° | 9.4h | 0d | 0.37" | 23 |
| May 2025 | 89 | 62.6° / 52.7° | 12h | 1d | 0.13" | 27 |
| June 2025 | 88 | 62.5° / 53.9° | 12.1h | 3d | 0" | 27 |
| July 2025 | 89 | 64.6° / 56.6° | 11h | 1d | 0" | 31 |
| August 2025 | 91 | 68.2° / 58.5° | 10.8h | 3d | 0.08" | 29 |
| September 2025 | 91 | 69.5° / 60.9° | 9.4h | 1d | 0.08" | 29 |
| October 2025 | 89 | 67.1° / 58.1° | 7.7h | 2d | 1.13" | 26 |
| November 2025 | 79 | 61.9° / 54.1° | 6.5h | 6d | 3.62" | 15 |
| December 2025 | 69 | 56.4° / 49.9° | 4.9h | 12d | 4.09" | 8 |
| January 2026 | 77 | 59° / 50.4° | 6.6h | 2d | 5.05" | 20 |
| February 2026 | 78 | 60.5° / 51.5° | 6.5h | 3d | 3.97" | 17 |
| March 2026 | 93 | 67.9° / 54.7° | 9.4h | 1d | 0.02" | 27 |
| April 2026 | 85 | 62.5° / 53.6° | 9.2h | 2d | 3.69" | 23 |
| May 2026 | 88 | 63.1° / 54.1° | 11.3h | 5d | 0.46" | 27 |
| June 2026 | 92 | 65.9° / 56.2° | 11.9h | 2d | 0" | 30 |
| July 2026 | 91 | 66.4° / 57.9° | 11.2h | 5d | 0" | 31 |
| August 2026 | 91 | 67.4° / 58.3° | 10.8h | 7d | 0" | 31 |
| September 2026 | 93 | 69.2° / 59.3° | 9.8h | 3d | 0.02" | 30 |
| October 2026 | 91 | 68.9° / 57.5° | 8.2h | 2d | 0.15" | 29 |
Climate Trends
Average Temperature by Month
About the San Bruno climate charts
The temperature chart compares average monthly highs and lows at San Bruno, 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 San Bruno. 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 San Bruno, the warmest typical hour is 3 PM in September (75°F). The coldest is 6 AM in January (47°F).
- Fog: Fog or low cloud covers San Bruno in 20% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. April mornings are the least foggy (8%).
- Wind: From February through October, wind at San Bruno typically builds after 1 PM. In June it peaks around 5 PM, averaging 13 mph with 27% of those hours windy, while mornings average 5 mph.
- Cloud Cover: October middays are the clearest at San Bruno (24% average cloud cover), and December middays are the cloudiest (38%).
- Solar Radiation: The strongest typical sun at San Bruno comes at 1 PM in June, averaging 918 W/m².
How to read the hourly heatmaps for San Bruno
This heatmap shows how average temperature at San Bruno 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 San Bruno. 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 San Bruno 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 San Bruno 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 San Bruno 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 San Bruno
- October 2026 recap: October 2026 at San Bruno averaged a high of 69°F, close to the 1991-2020 normal of 69°F. It brought 0.15 in. of rain, compared with a normal of 1.06 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 22.1 in. of rain to San Bruno, 95% of the 23.1 in. normal.
Location Details
San Bruno weather questions
Everything you need to know about weather and visiting San Bruno
What is the weather like at San Bruno today?
It's 53°F at San Bruno right now, with a comfort score of 77 (great). Monday's forecast high at San Bruno is 57°F, 6°F below the mid November normal of 63°F. The best window today is 8 AM to 11 AM, at about 55°F with a 5 mph wind (comfort 58).
What is the best month to visit San Bruno?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at San Bruno are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 11 AM to 2 PM in August, and 11 AM to 2 PM in July. The warm season lasts about 3.6 months, from Jul 8 to Oct 24, when the average high is 69°F or warmer. Highs peak around Sep 8 at about 71°F.
What are the warmest and coldest months at San Bruno?
September is the warmest month at San Bruno, with an average high of 71°F. January is the coldest, with an average low of 45°F.
When does the fog burn off at San Bruno?
Fog or low cloud covers San Bruno in 20% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 2 PM. April mornings are the least foggy (8%).
When is it windiest at San Bruno?
From February through October, wind at San Bruno typically builds after 1 PM. In June it peaks around 5 PM, averaging 13 mph with 27% of those hours windy, while mornings average 5 mph.
How much rain does San Bruno get?
December is the wettest month (4.8 in.), out of about 23.1 in. a year. The rainy season runs from Nov 12 to Apr 5, when a day has at least a 20% chance of measurable rain. That stretch brings 81% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 22.1 in. of rain to San Bruno, 95% of the 23.1 in. normal.
How does San Bruno weather compare with Montara?
Montara, 8.4 miles away, runs about 14°F cooler than San Bruno on summer afternoons. It also has far more summer morning fog, 60% of morning hours compared with 15%.
What kind of place is San Bruno?
San Bruno climbs from the flats beside SFO and El Camino Real up a series of hillside neighborhoods toward Skyline Boulevard. Above them is Sweeney Ridge, the National Park Service ridge it shares with Pacifica. Interstate 380 cuts through the middle of town on its way from Interstate 280 to the airport. The BART station sits beside the Tanforan shopping center, and San Mateo County's Junipero Serra Park, off Crystal Springs Road, looks out over the runways and the bay.
What is San Bruno weather like in November?
November at San Bruno averages a high of 63°F and a low of 49°F, with 2.4 in. of rain over about 6 rainy days. Afternoon wind averages 6 mph.
More about San Bruno 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.
- National Park Service, Sweeney Ridge (accessed 2026-10-27)
- San Mateo County Parks, Quail Loop Trail (Junipero Serra Park) (accessed 2026-10-27)
- San Mateo County Parks, Junipero Serra Park (accessed 2026-10-27)
- BART, San Bruno station (accessed 2026-10-27)
Rendered 2026-11-15T12:16:25.250Z.