Weather StoryAlmanac, microseasons, and the day's weather story.

San Francisco, California Weather

August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →

San Francisco weather forecast — hour by hour, 7-day outlook, NOAA radar

San Francisco, CA
Sunday, August 2 at 6:46 AM
53
°
Clear
Feels like
50°
Humidity
94%
Wind
6 mph
Sunrise
11:14 PM
Sunset
1:17 PM
San Francisco, CA
Hour by hour · 24h
24-Hour ForecastSan Francisco, CA: 24-hour forecast. Temperatures range from 52 to 76 degrees Fahrenheit.
L 52°H 76°
San Francisco, CA
7-day forecast
  1. Today
    Aug 2
    Mostly Clear
    —
    —
    76°52°—
  2. Monday
    Aug 3
    Clear
    —
    —
    77°53°+1°
  3. Tuesday
    Aug 4
    Clear
    —
    —
    76°57°-1°
  4. Wednesday
    Aug 5
    Mostly Clear
    —
    —
    73°57°-3°
  5. Thursday
    Aug 6
    Clear
    —
    —
    74°58°+1°
  6. Friday
    Aug 7
    Clear
    —
    —
    74°56°0°
  7. Saturday
    Aug 8
    Clear
    —
    —
    76°57°+2°
San Francisco, CA
Next 24 hours · Cool now
45°63°80°6a12p6p12anow 52°high 76°low 52°
San Francisco, CA
Anemometer · 24h winds · from true
NESW
From · True
SW
231° · backing 10°
Direction
SW
231°
Sustained
6
mph
Gust
11
mph
Peak 24h
22
avg 10 mph
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 10 mph · pk 22 mph @ 5:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 206SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 10° from the sw.
San Francisco, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
985.7
-0.2 mb in 3h · steady · 29.11 inHg
Now
985.7
mb
3h
-0.2
mb
12h
-1.8
mb
24h
-4.2
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 986–992
9809859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW991.8986.3986.3
Deep low — expect rough seas, strong wind, and persistent rain.
San Francisco, CA
Air quality
47
AQI
Good
→+1 in 6h

AQI 47 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.2 µg/m³ (AQI 51) with a 0.63 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in stagnant air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
9.2μg/m³
PM 10Good
15μg/m³
NO₂Good
7μg/m³
OzoneGood
37μg/m³
UV IndexLow
0.0

What's driving it

PM × Wind × Precip

PM2.5 at 9.2 µg/m³ (AQI 51) with a 0.63 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in stagnant air, not road dust.

PM2.5/PM10
0.63
Wind
light
Recent rain
0h in last 6h
Pattern
stagnant smoke

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³300
San Francisco, CA
Sky cover · visibility · 24h
Cloud cover
17%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
24.9mi
UNLIMITED
52 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
13:46 UTC · San Francisco, CA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
13:46 UTC · San Francisco, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
San Francisco, CA
Satellite · infrared · animated
San Francisco, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
San Francisco, CA
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:46 AM
Sunrise
11:14 PM
Daylight
14h 03m
Sunset
1:17 PM
Civil dusk
8:48 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
San Francisco, CA
The moon
Waning Gibbous
85% illuminated
Moonrise
9:55 PM
Moonset
10:20 AM
In sign
♓︎ Pisces
San Francisco, CA
Microseason
Aug 1–5

August begins in scorching stillness

plant
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

San Francisco at a glance

  • Today vs. normal: 12°F below the seasonal normal for this latitude
  • Last frost: April 3 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 94102, 94103, 94104, 94105, 94107, 94108, 94109, 94110 +21 more

16-Day Forecast — San Francisco

  1. Sun75°52°2%
  2. Mon77°53°3%
  3. Tue76°57°0%
  4. Wed73°57°0%
  5. Thu74°58°0%
  6. Fri74°56°0%
  7. Sat76°57°0%
  8. Sun68°56°0%
  9. Mon70°57°0%
  10. Tue69°57°0%
  11. Wed67°57°0%
  12. Thu67°57°3%
  13. Fri69°57°6%
  14. Sat67°58°0%
  15. Sun68°57°3%
  16. Mon76°56°3%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near San Francisco

Right now in the garden

Peak growing season

As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

Sun & seasons in San Francisco

San Francisco sits in San Francisco County, where the year’s longest day runs 14h 47m of daylight and its shortest just 9h 33m — a swing of +5h 14m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Los Angeles, the state’s largest city, lies about 338 miles to the SE. The nearest town San Francisco tracks is Oakland, roughly 13 miles to the E.

Air quality in San Francisco’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 32). See the full air-quality history for San Francisco.

January 1–5: New year in coastal mist.January 6–10: Hills hold the winter cold.January 11–15: Light lengthens over wet earth.January 16–20: The green pulse quickens.January 21–25: Spring green spreads inland.January 26–31: Winter's grip releases.February 1–5: Fog lifts, flowers open.February 6–10: Blooms erupt across chaparral.February 11–15: Winter blooms at their peak.February 16–20: Rivers recede, flowers spread.February 21–25: Earth warms, flowers rush upslope.February 26–28: Spring advances on cool winds.March 1–5: Grass and trees bud and break.March 6–10: Insects wake and feed.March 11–15: Blossoms crown the hillsides.March 16–20: Monarch chrysalis emergence.March 21–25: Light overtakes dark at equinox.March 26–31: California poppy ablaze.April 1–5: Spring rain feeds the seedlings.April 6–10: Warblers flood the understory.April 11–15: Allen's hummingbirds in courtship dives.April 16–20: Coastal fog settles; sun breaks midday.April 21–25: Oak canopies full and green.April 26–30: Chaparral awakens after spring rains.May 1–5: Coastal wildflowers at their peak.May 6–10: Gray whales complete their migration north.May 11–15: Redwood coast in cool shade.May 16–20: Fog and sun in daily rhythm.May 21–25: Summer approaches; hills turn gold.May 26–31: Dry season begins; tule fog in valleys.June 1–5: Coastal fog thickens at dawn.June 6–10: California poppies fade as heat rises.June 11–15: Summer solstice light stretched thin.June 16–20: Bay laurel fragrance sweetens shade.June 21–25: Longest daylight, driest air.June 26–30: Fog banks mask the turning tide.July 1–5: Summer heat deepens across the valleys.July 6–10: Warm winds drive dryness inland.July 11–15: Pacific high settles in firmly.July 16–20: Young hawks take to the thermals.July 21–25: Peak fire season, peak heat.July 26–31: Chaparral poised for ignition.August 1–5: August begins in scorching stillness.August 6–10: Autumn's first cool breath arrives.August 11–15: Cool winds signal the turning year.August 16–20: Evening cicada chorus.August 21–25: Marine layer descent.August 26–31: Monarch staging begins.September 1–5: Fire season intensity.September 6–10: Dew on drying grasses.September 11–15: Raptor passage begins.September 16–20: Equinox descent.September 21–25: Ceanothus blooms again.September 26–30: Insects retreat below.October 1–5: Creeks begin to whisper.October 6–10: Santa Ana wind season.October 11–15: Wildflower anticipation.October 16–20: Chaparral embers glow.October 21–25: First atmospheric river looms.October 26–31: Rains return at last.November 1–5: Coast live oak leaves turn amber.November 6–10: California lilac blooms in winter light.November 11–15: First rain greens the chaparral.November 16–20: Coastal fog thickens as storms approach.November 21–25: Thanksgiving rains swell the valleys.November 26–30: Autumn's last breath yields to winter.December 1–5: December arrives, storms accelerate.December 6–10: Winter solstice season intensifies.December 11–15: Deep winter: rivers at flood stage.December 16–20: Winter salmon runs peak in northern rivers.December 21–25: Winter solstice: the sun turns.December 26–31: Year's end in wind and rain.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

August begins in scorching stillness

Calm days dominate early August; temperatures peak; the entire ecosystem is in survival mode.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

September is San Francisco's warmest stretch (~63°F) and January its coldest (~52°F); precipitation crests in December at 4.8 inches and ebbs in July to 0.0 inches.

MonthMean tempPrecipRainy days
January52°4.4″8
February54°4.4″8
March56°3.1″7
April56°1.6″4
May58°0.7″2
June60°0.2″1
July60°0.0″0
August62°0.1″0
September63°0.1″0
October62°0.9″2
November57°2.6″5
December53°4.8″8

Regional context

In San Francisco, NOAA NCEI 1991-2020 normals put January near 52°F and July near 60°F — a 8°F seasonal arc — with about 22.9 inches of precipitation over 45 rainy or snowy days.

San Francisco's moisture rides winter storm tracks: December brings 4.8 inches over 8.0 wet days, while July sees only 0.0 inches across 0.0 days in the dry warm season. That cool-season-wet pattern aligns San Francisco with places like Broadmoor, CA, Daly City, CA and Brisbane, CA.

With a coldest-month mean of 52°F, San Francisco stays mostly frost-free and grows year-round. The September peak near 63°F is San Francisco's real limit, pushing cool-season vegetables to spring and fall. San Francisco's coastal lots stay 4-7°F milder overnight than San Francisco's inland parcels.

Similar climates: Broadmoor, CA, Daly City, CA, Brisbane, CA, Colma, CA, South San Francisco, CA.

Naturalist notes

Late May brings the peak flowering of California poppies across hillsides, their orange petals opening wide during warm afternoon hours.

Anna's hummingbirds begin their courtship displays in February, with males performing dramatic dive flights that produce distinctive whistling sounds.

Frequently asked

When does it freeze in San Francisco?
Frost typically leaves San Francisco by mid-April and returns to San Francisco near mid-November.
What is the rainy season in San Francisco?
December is the wettest month in San Francisco, about 4.8 inches on average; the year totals roughly 23 inches.
What is the warmest month in San Francisco?
September is San Francisco's warmest month, averaging about 63°F.
What is the coldest month in San Francisco?
San Francisco bottoms out in January, with a mean near 52°F.
When can I start a vegetable garden in San Francisco?
San Francisco's last frost (mid-April) cues hardy greens; in San Francisco, hold heat-lovers two weeks past.
How many rainy days does San Francisco get?
San Francisco records around 45 days of measurable precipitation annually.
What hardiness zone is San Francisco?
San Francisco's hardiness zone tracks its winter low; with January near 52°F, check the USDA ZIP map for the exact zone.
What is the 10-day forecast for San Francisco?
San Francisco's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in San Francisco?
See this week's day-by-day rain chances for San Francisco in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in San Francisco?
Current conditions for San Francisco and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the San Francisco forecast updated?
The San Francisco forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in San Francisco?
Today's sunrise and sunset times for San Francisco are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for San Francisco?
The next few days in San Francisco's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

San Francisco, California occupies a hot-summer Mediterranean zone, with January means near 52°F and July around 60°F — a 8°F swing.

Yearly precipitation in San Francisco totals around 23 inches, spread over about 45 days of rain or snow.

The 8°F gap between San Francisco's summer and winter, at 37.8°N, shapes San Francisco's frost calendar.

All cities in California →

Los Angeles, CA weather →

ZIP codes in San Francisco

  • 94130
  • 94131
  • 94132
  • 94133
  • 94134
  • 94103
  • 94102
  • 94105
  • 94104
  • 94188
  • 94158
  • 94124
  • 94123
  • 94122
  • 94121
  • 94129
  • 94118
  • 94108
  • 94107
  • 94112
  • 94110
  • 94116
  • 94117
  • 94114
  • 94115
  • 94111
  • 94109
  • 94127
  • 94119
  • 94120
  • 94125
  • 94137
  • 94139
  • 94140
  • 94141
  • 94142
  • 94143
  • 94144
  • 94145
  • 94146
  • 94147
  • 94151
  • 94159
  • 94160
  • 94161
  • 94163
  • 94164
  • 94172
  • 94177

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.