San Francisco Weather
San Francisco weather today, the 14-day forecast, and average temperature, rain and what to wear for every month — compared against Hong Kong. Best months to visit: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct and Nov.
San Francisco current weather
San Francisco now (local time 00:45)
21°C
Clear
- Feels like
- 19°
- Humidity
- 41%
- Wind
- 9 km/h
Next 7 days · what to wear
14° – 34°C
Mostly dry all week
👕 Short sleeves, plus a light layer for air-conditioned interiors; big day–night swing, so dress in layers.
San Francisco 14-day forecast
Today
10/4
☁️
34°
18°
💧1%
Mon
10/5
🌤️
27°
14°
💧1%
Tue
10/6
☀️
28°
19°
💧0%
Wed
10/7
☀️
27°
18°
💧0%
Thu
10/8
☀️
25°
18°
💧0%
Fri
10/9
☀️
24°
16°
💧1%
Sat
10/10
☁️
17°
14°
💧2%
Sun
10/11
☀️
19°
13°
💧4%
Mon
10/12
☀️
23°
16°
💧13%
Tue
10/13
⛅
21°
15°
💧8%
Wed
10/14
🌤️
22°
15°
💧4%
Thu
10/15
☀️
25°
16°
💧3%
Fri
10/16
☁️
28°
16°
💧0%
Sat
10/17
☁️
28°
17°
💧0%
Best time to visit San Francisco
On temperature and rainfall, the most comfortable months in San Francisco are Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct and Nov. The hottest month is September (average high 24°C) and the coldest is January (average low 6°C).
San Francisco climate by month
| Month | Avg high | Avg low | Rain | Humidity | vs Hong Kong |
|---|---|---|---|---|---|
| JanBest | 13°C | 6°C | 100 mm | 84% | -7°C |
| FebBest | 14°C | 7°C | 102 mm | 82% | -7°C |
| MarBest | 16°C | 8°C | 82 mm | 82% | -8°C |
| AprBest | 17°C | 8°C | 42 mm | 80% | -11°C |
| MayBest | 19°C | 10°C | 18 mm | 78% | -12°C |
| JunBest | 22°C | 11°C | 6 mm | 74% | -12°C |
| JulBest | 22°C | 12°C | 1 mm | 74% | -12°C |
| AugBest | 23°C | 13°C | 1 mm | 74% | -11°C |
| SepBest | 24°C | 13°C | 4 mm | 70% | -10°C |
| OctBest | 22°C | 11°C | 29 mm | 69% | -10°C |
| NovBest | 17°C | 9°C | 62 mm | 76% | -10°C |
| Dec | 14°C | 7°C | 138 mm | 82% | -8°C |
Data: NASA POWER 2001–2020 climatology (MERRA-2, elevation-corrected); Hong Kong comparison uses HKO 1991–2020 normals.
San Francisco weather month by month: what to wear
San Francisco in OctoberBest monthThis month
October in San Francisco is pleasantly warm: average highs of 22°C and lows of 11°C, around 29 mm of rain (dry) and 69% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
San Francisco in NovemberBest month
November in San Francisco is mild and cool: average highs of 17°C and lows of 9°C, around 62 mm of rain (mostly dry) and 76% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater.
San Francisco in December
December in San Francisco is chilly: average highs of 14°C and lows of 7°C, around 138 mm of rain (some rain) and 82% humidity — about 8°C colder than Hong Kong.
👕 A sweater plus a coat or windbreaker.
San Francisco in JanuaryBest month
January in San Francisco is chilly: average highs of 13°C and lows of 6°C, around 100 mm of rain (some rain) and 84% humidity — about 7°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 A sweater plus a coat or windbreaker.
San Francisco in FebruaryBest month
February in San Francisco is chilly: average highs of 14°C and lows of 7°C, around 102 mm of rain (some rain) and 82% humidity — about 7°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 A sweater plus a coat or windbreaker.
San Francisco in MarchBest month
March in San Francisco is chilly: average highs of 16°C and lows of 8°C, around 82 mm of rain (some rain) and 82% humidity — about 8°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater.
San Francisco in AprilBest month
April in San Francisco is mild and cool: average highs of 17°C and lows of 8°C, around 42 mm of rain (mostly dry) and 80% humidity — about 11°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater.
San Francisco in MayBest month
May in San Francisco is mild and cool: average highs of 19°C and lows of 10°C, around 18 mm of rain (dry) and 78% humidity — about 12°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater; big day–night swing, so dress in layers.
San Francisco in JuneBest month
June in San Francisco is pleasantly warm: average highs of 22°C and lows of 11°C, around 6 mm of rain (dry) and 74% humidity — about 12°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
San Francisco in JulyBest month
July in San Francisco is pleasantly warm: average highs of 22°C and lows of 12°C, around 1 mm of rain (dry) and 74% humidity — about 12°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
San Francisco in AugustBest month
August in San Francisco is pleasantly warm: average highs of 23°C and lows of 13°C, around 1 mm of rain (dry) and 74% humidity — about 11°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
San Francisco in SeptemberBest month
September in San Francisco is pleasantly warm: average highs of 24°C and lows of 13°C, around 4 mm of rain (dry) and 70% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
FAQ
›What is the best time to visit San Francisco?
On temperature and rainfall, the most comfortable months in San Francisco are Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct and Nov. The hottest month is September (average high 24°C) and the coldest is January (average low 6°C).
›What's the weather like in San Francisco in October, and what should I wear?
October in San Francisco is pleasantly warm: average highs of 22°C and lows of 11°C, around 29 mm of rain (dry) and 69% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit. What to wear: Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
›What's the weather like in San Francisco in November, and what should I wear?
November in San Francisco is mild and cool: average highs of 17°C and lows of 9°C, around 62 mm of rain (mostly dry) and 76% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit. What to wear: Long sleeves with a light jacket or sweater.
›When is the rainy season in San Francisco?
San Francisco is wettest in December, with about 138 mm on average, and driest in July, with about 1 mm.
›How cold does San Francisco get? Does it snow?
The coldest month is January, averaging 13°C by day and 6°C at night. Snow is very unlikely.
Planning a trip to San Francisco?
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Forecast data: Open-Meteo.com (CC BY 4.0), refreshed every 3 hours. Hottest month: September; coldest: January.