Belmont Weather
Town • San Francisco Bay Area
Belmont starts on the flats along El Camino Real and the Caltrain line between San Mateo and San Carlos. From there it climbs west through hillside neighborhoods to the edge of San Francisco's Peninsula Watershed lands, with Waterdog Lake in the higher foothills. Ralston Hall, the mansion of Bank of California founder William Ralston, stands on the Notre Dame de Namur University campus. East of Highway 101, a bridge near the Belmont Sports Complex connects to the Bay Trail along Belmont Slough.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Belmont weather today and through the year
It's 54°F at Belmont right now (feels like 51°F), with 7 mph wind and a comfort score of 78. Monday's forecast high at Belmont is 57°F, 7°F below the mid November normal of 64°F. The best window today is noon to 3 PM, at about 52°F with a 3 mph wind (comfort 58).
September is the warmest month at Belmont, with an average high of 76°F. December is the coldest, with an average low of 42°F. January is the wettest month (4.0 in.), out of about 19.8 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Belmont are September, August, and July. The best hours are usually 10 AM to 1 PM in September, 11 AM to 2 PM in August, and 10 AM to 1 PM in July.
In Belmont, the weather depends on how far up the hill you live. The flats near El Camino Real behave much like San Carlos next door, sunny on most summer afternoons with a moderate breeze off the bay. The upper neighborhoods and Waterdog Lake sit close to the ridge above the Crystal Springs valley. On summer evenings they are the first to feel cool ocean air arriving through the Highway 92 gap, with more wind and sometimes fog drifting over the crest.
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 Belmont in the next few days
No active National Weather Service alerts for this location.
Best time to go
The best window today is noon to 3 PM, at about 52°F with a 3 mph wind (comfort 58).
Best day this week
Of the next 7 days, Friday looks best for Belmont, with a 61°F high and midday comfort near 79. Thursday looks weakest (51).
Rain
Next good chance of rain: today (78%, about 0.24 in.).
Live weather map
Weather around Belmont right now
Overcast and 54° at Belmont right now.
About the live weather map for Belmont
The map centers on Belmont 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.
Belmont vs nearby places
Typical summer conditions compared with Belmont, 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 Belmont |
|---|---|---|---|---|---|
| San Carlos | 1.2 mi | +2°F | 7% | 10 mph | a very similar climate |
| Foster City | 2.7 mi | -12°F | 14% | 12 mph | about 12°F cooler on summer afternoons |
| Redwood City | 3.2 mi | +3°F | 13% | 10 mph | a very similar climate |
| Half Moon Bay | 9.2 mi | -12°F | 64% | 8 mph | more summer morning fog (64% vs 13% of morning hours) and about 12°F cooler on summer afternoons |
| Moss Beach | 13 mi | -16°F | 66% | 9 mph | more summer morning fog (66% vs 13% of morning hours) and about 16°F cooler on summer afternoons |
| Pacifica | 13.2 mi | -19°F | 56% | 9 mph | about 19°F cooler on summer afternoons and more summer morning fog (56% vs 13% of morning hours) |
Places with a climate like Belmont's
- Vallejo (40 mi away): similar temperatures through the year
- Los Altos (13 mi away): similar temperatures through the year
- San Anselmo (35 mi away): similar temperatures through the year
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Belmont climate comparisons mean
These cards compare recent conditions at Belmont 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 Belmont 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.
Belmont weather by month
September is the warmest month at Belmont, with an average high of 76°F. December is the coldest, with an average low of 42°F. January is the wettest month (4.0 in.), out of about 19.8 in. a year. Morning fog peaks in December, when fog or low cloud covers 17% of the hours from 6 to 10 AM. June has the clearest middays, with clouds covering about 20% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Belmont are September, August, and July. The best hours are usually 10 AM to 1 PM in September, 11 AM to 2 PM in August, 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 | 59°F | 42°F | 4.0 in | 8 | 11% | 34% | 5 mph | 9.9 h | 60 |
| Feb | 61°F | 44°F | 3.9 in | 8 | 10% | 28% | 7 mph | 10.8 h | 61 |
| Mar | 64°F | 46°F | 3.0 in | 7 | 8% | 32% | 8 mph | 11.9 h | 65 |
| Apr | 66°F | 47°F | 1.4 in | 5 | 7% | 27% | 10 mph | 13.2 h | 72 |
| May | 69°F | 51°F | 0.6 in | 3 | 8% | 29% | 12 mph | 14.2 h | 74 |
| Jun | 73°F | 53°F | 0.1 in | 2 | 11% | 20% | 12 mph | 14.7 h | 86 |
| Jul | 75°F | 55°F | 0.0 in | 0 | 15% | 21% | 12 mph | 14.5 h | 87 |
| Aug | 75°F | 55°F | 0.0 in | 1 | 13% | 21% | 11 mph | 13.6 h | 88 |
| Sep | 76°F | 54°F | 0.1 in | 1 | 12% | 22% | 9 mph | 12.3 h | 90 |
| Oct | 73°F | 51°F | 0.9 in | 4 | 10% | 21% | 7 mph | 11.1 h | 84 |
| Nov | 64°F | 46°F | 1.9 in | 6 | 10% | 24% | 6 mph | 10.1 h | 76 |
| Dec | 59°F | 42°F | 3.9 in | 8 | 17% | 35% | 5 mph | 9.6 h | 58 |
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 Belmont's weather different
When the fog burns off
1 PMwhen December fog usually thins (18% foggy at 9 AM)
Fog or low cloud covers Belmont in 18% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (7%).
When the wind picks up
1 PMwhen afternoon wind builds, February–October
From February through October, wind at Belmont typically builds after 1 PM. In June it peaks around 5 PM, averaging 14 mph with 27% of those hours windy, while mornings average 5 mph.
Microclimate
−12°FHalf Moon Bay, 9.2 mi away, on summer afternoons
Half Moon Bay, 9.2 miles away, runs about 12°F cooler than Belmont on summer afternoons. It also has far more summer morning fog, 64% of morning hours compared with 13%.
Daylight
9.6–14.7 hof daylight, Dec to Jun
Days at Belmont range from about 9.6 hours in December to 14.7 hours in June. In mid-June the sun sets around 8:30 PM, and in mid-December around 4:57 PM.
Seasons at Belmont
- Warm seasonJul 1 – Sep 30 · highs 74°F+
The warm season lasts about 3 months, from Jul 1 to Sep 30, when the average high is 74°F or warmer. Highs peak around Sep 8 at about 76°F.
- Cool seasonNov 27 – Mar 2 · highs 63°F or lower
The cool season runs from Nov 27 to Mar 2, when the average high is 63°F or lower. The coldest nights come around Dec 8, with an average low near 42°F.
- Rainy seasonNov 19 – Mar 29 · 77% of the year's rain
The rainy season runs from Nov 19 to Mar 29, when a day has at least a 20% chance of measurable rain. That stretch brings 77% 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 2 and half of its annual total by Jan 26.
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, Belmont averaged 10 days a year at 90°F or hotter and no freezing nights. It averaged 12 days a year with at least half an inch of rain and 2 afternoons with wind of 20 mph or more at 2 PM. About 53 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (98°F) and the coldest night was Feb 10, 2025 (38°F). The wettest day was Nov 23, 2024 (1.96 in.), and the strongest 2 PM gust was 49 mph on Mar 12, 2025.
- 10days at 90°F or hotter
- 0nights at or below freezing
- 12days with ½ in. of rain or more
- 2afternoons with 20+ mph wind
- 53mornings with 3+ hours of fog or low cloud
- Hottest day98°FSep 9, 2026
- Coldest night38°FFeb 10, 2025
- Wettest day1.96 inNov 23, 2024
- Strongest 2 PM gust49 mphMar 12, 2025
What shapes Belmont's weather
Belmont sits at a turning point in the Peninsula's change from cooler north to warmer south. San Mateo, a few miles north, gets more of the cool air coming through the San Bruno and Crystal Springs gaps. Redwood City, a few miles south, sits behind higher mountains and warms up more. Belmont lands in between, so a summer day that feels hot in Redwood City is usually milder here.
On clear winter nights after a storm, cold air drains off the hills and settles in the canyon bottoms and low spots near the bay. Those low spots chill faster than the slopes above them. The hillside streets also catch a little more rain than the flats as storms lift over higher ground.
Tips for visiting Belmont
Take Caltrain to El Camino Real
Belmont station is at 995 El Camino Real, with an elevator, bike racks and bike lockers, and SamTrans bus connections.
Cross Highway 101 to the Bay Trail
A bike and pedestrian bridge near the Belmont Sports Complex leads to the Bay Trail along Belmont Slough and into Foster City and Redwood Shores.
Time a slough walk with the tide
Check a tide table before a slough walk, because bay tides change Belmont Slough's water level and look a great deal. The slough widens as it nears the bay.
Bring a layer for the hills
Hillside streets and trails toward Waterdog Lake can be windy and cool on summer evenings while the flats are still warm.
Belmont through the seasons
- Spring (March–May)
- Spring brings green hills and mild, breezy afternoons. It is the best season for walks in the western foothills before the grass dries.
- Summer (June–August)
- Summer afternoons are sunny on the flats most days. The upper hills get the evening wind and sometimes fog spilling over the ridge.
- Fall (September–October)
- September is the warmest month, and fall winds are lighter than summer's, with clear views from the hills across the bay.
- Winter (November–February)
- Winter is the rainy season. Clear nights between storms are coldest in the canyon bottoms and low spots near the bay.
Activities and the weather that matters
- Biking the Bay Trail: The levee along Belmont Slough is flat and open to the wind. Mornings and fall afternoons are the calmest.
- Foothill walks: The western hills are best on clear spring days. Summer evenings up there can turn cool and windy fast.
- Birding on Belmont Slough: Tides drive what you see, because the slough's water level and appearance change strongly with the bay tide.
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 | 83 | 62.6° / 47.7° | 6.6h | 2d | 3.07" | 22 |
| December 2024 | 74 | 60.3° / 46.9° | 5.2h | 4d | 4.64" | 13 |
| January 2025 | 84 | 59.8° / 43.5° | 6.8h | 1d | 0.13" | 22 |
| February 2025 | 77 | 61° / 45.6° | 6.7h | 3d | 5.81" | 16 |
| March 2025 | 84 | 62° / 46.7° | 8.4h | 0d | 1.9" | 21 |
| April 2025 | 90 | 66.2° / 48.3° | 9.5h | 1d | 0.42" | 24 |
| May 2025 | 93 | 71.3° / 51.3° | 12.2h | 1d | 0.15" | 30 |
| June 2025 | 92 | 70.8° / 52.6° | 12.4h | 6d | 0" | 28 |
| July 2025 | 92 | 71.9° / 55.6° | 11.7h | 5d | 0" | 31 |
| August 2025 | 93 | 78.2° / 57.6° | 11.1h | 1d | 0" | 31 |
| September 2025 | 92 | 77.7° / 60.4° | 9.7h | 1d | 0.13" | 29 |
| October 2025 | 90 | 71.9° / 54.7° | 8h | 1d | 0.54" | 28 |
| November 2025 | 79 | 64.6° / 50.7° | 6.3h | 7d | 2.45" | 17 |
| December 2025 | 72 | 57.9° / 46.4° | 5.2h | 9d | 3.44" | 10 |
| January 2026 | 81 | 61.5° / 45.8° | 6.6h | 3d | 4.15" | 23 |
| February 2026 | 81 | 63.4° / 47.9° | 6.8h | 3d | 2.24" | 20 |
| March 2026 | 95 | 76.4° / 52.6° | 9.6h | 1d | 0" | 30 |
| April 2026 | 89 | 66.9° / 50.6° | 9.2h | 1d | 1.7" | 25 |
| May 2026 | 92 | 69.7° / 52.5° | 11.6h | 4d | 0.25" | 31 |
| June 2026 | 95 | 74.4° / 55.6° | 12.2h | 1d | 0" | 30 |
| July 2026 | 94 | 74.8° / 56.9° | 11.7h | 3d | 0" | 31 |
| August 2026 | 94 | 76.4° / 57.5° | 11.1h | 2d | 0" | 31 |
| September 2026 | 93 | 76.5° / 57° | 10.1h | 1d | 0.01" | 29 |
| October 2026 | 91 | 75.4° / 54.9° | 8.1h | 2d | 0.08" | 29 |
Climate Trends
Average Temperature by Month
About the Belmont climate charts
The temperature chart compares average monthly highs and lows at Belmont, 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 Belmont. 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 Belmont, the warmest typical hour is 3 PM in August (78°F). The coldest is 7 AM in December (46°F).
- Fog: Fog or low cloud covers Belmont in 18% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (7%).
- Wind: From February through October, wind at Belmont typically builds after 1 PM. In June it peaks around 5 PM, averaging 14 mph with 27% of those hours windy, while mornings average 5 mph.
- Cloud Cover: June middays are the clearest at Belmont (20% average cloud cover), and December middays are the cloudiest (35%).
- Solar Radiation: The strongest typical sun at Belmont comes at 1 PM in July, averaging 970 W/m².
How to read the hourly heatmaps for Belmont
This heatmap shows how average temperature at Belmont 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 Belmont. 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 Belmont 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 Belmont 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 Belmont 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 Belmont
- October 2026 recap: October 2026 at Belmont averaged a high of 75°F, 3°F warmer than the 1991-2020 normal of 73°F. It brought 0.08 in. of rain, compared with a normal of 0.89 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 14.8 in. of rain to Belmont, 75% of the 19.8 in. normal.
Location Details
Belmont weather questions
Everything you need to know about weather and visiting Belmont
What is the weather like at Belmont today?
It's 54°F at Belmont right now, with a comfort score of 78 (great). Monday's forecast high at Belmont is 57°F, 7°F below the mid November normal of 64°F. The best window today is noon to 3 PM, at about 52°F with a 3 mph wind (comfort 58).
What is the best month to visit Belmont?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Belmont are September, August, and July. The best hours are usually 10 AM to 1 PM in September, 11 AM to 2 PM in August, and 10 AM to 1 PM in July. The warm season lasts about 3 months, from Jul 1 to Sep 30, when the average high is 74°F or warmer. Highs peak around Sep 8 at about 76°F.
What are the warmest and coldest months at Belmont?
September is the warmest month at Belmont, with an average high of 76°F. December is the coldest, with an average low of 42°F.
When does the fog burn off at Belmont?
Fog or low cloud covers Belmont in 18% of 9 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (7%).
When is it windiest at Belmont?
From February through October, wind at Belmont typically builds after 1 PM. In June it peaks around 5 PM, averaging 14 mph with 27% of those hours windy, while mornings average 5 mph.
How much rain does Belmont get?
January is the wettest month (4.0 in.), out of about 19.8 in. a year. The rainy season runs from Nov 19 to Mar 29, when a day has at least a 20% chance of measurable rain. That stretch brings 77% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 14.8 in. of rain to Belmont, 75% of the 19.8 in. normal.
How does Belmont weather compare with Half Moon Bay?
Half Moon Bay, 9.2 miles away, runs about 12°F cooler than Belmont on summer afternoons. It also has far more summer morning fog, 64% of morning hours compared with 13%.
What kind of place is Belmont?
Belmont starts on the flats along El Camino Real and the Caltrain line between San Mateo and San Carlos. From there it climbs west through hillside neighborhoods to the edge of San Francisco's Peninsula Watershed lands, with Waterdog Lake in the higher foothills. Ralston Hall, the mansion of Bank of California founder William Ralston, stands on the Notre Dame de Namur University campus. East of Highway 101, a bridge near the Belmont Sports Complex connects to the Bay Trail along Belmont Slough.
What is Belmont weather like in November?
November at Belmont averages a high of 64°F and a low of 46°F, with 1.9 in. of rain over about 6 rainy days. About 10% of morning hours are foggy. Afternoon wind averages 6 mph.
More about Belmont 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.
- Caltrain, Belmont station (accessed 2026-10-27)
- MTC, San Francisco Bay Trail Map 4: Burlingame to Redwood Shores (accessed 2026-10-27)
- City of Foster City, Levee Pedway (Belmont Slough) (accessed 2026-10-27)
Rendered 2026-11-15T12:16:25.674Z.