San Francisco Weather in January
Average highs run from 33°C on January 1 to 34°C on January 31, and lows from 22°C to 22°C. Normal precipitation for the month is 3 mm over about 0 wet days.
January day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
January at a glance
- Average high
- 34°C
- Average low
- 22°C
- Precipitation
- 3 mm
- Reanalysis high
- 38°CJan 25, 2002
- Reanalysis low
- 17°CJan 22, 2009
- Daylight
- 11 h 20 min to 11 h 32 min
- Cloud cover
- 25%
- Humidity
- 56%
- Dew point
- 16°C
- Wind
- 13.0 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 33°C | 22°C | 35°C 1995 | 19°C 2009 | 1% |
| Jan 2 | 33°C | 22°C | 36°C 1993 | 18°C 2009 | 1% |
| Jan 3 | 33°C | 22°C | 36°C 1993 | 19°C 2011 | 1% |
| Jan 4 | 33°C | 22°C | 36°C 1998 | 18°C 2011 | 1% |
| Jan 5 | 33°C | 22°C | 36°C 1998 | 18°C 2012 | 2% |
| Jan 6 | 33°C | 22°C | 35°C 2002 | 17°C 2000 | 1% |
| Jan 7 | 33°C | 22°C | 36°C 1995 | 17°C 2011 | 1% |
| Jan 8 | 33°C | 22°C | 35°C 1995 | 18°C 2006 | 1% |
| Jan 9 | 33°C | 22°C | 36°C 1998 | 18°C 1996 | 1% |
| Jan 10 | 33°C | 21°C | 37°C 1998 | 19°C 1996 | 1% |
| Jan 11 | 33°C | 21°C | 36°C 1998 | 18°C 2010 | 1% |
| Jan 12 | 33°C | 21°C | 36°C 1998 | 19°C 2010 | 1% |
| Jan 13 | 33°C | 21°C | 36°C 2005 | 18°C 1999 | 1% |
| Jan 14 | 33°C | 21°C | 36°C 1998 | 17°C 1996 | 1% |
| Jan 15 | 33°C | 21°C | 36°C 2002 | 18°C 1996 | 0% |
| Jan 16 | 33°C | 21°C | 36°C 1998 | 18°C 2006 | 0% |
| Jan 17 | 34°C | 21°C | 36°C 1998 | 18°C 2009 | 0% |
| Jan 18 | 34°C | 22°C | 36°C 1994 | 18°C 2000 | 1% |
| Jan 19 | 34°C | 22°C | 36°C 1998 | 19°C 2000 | 1% |
| Jan 20 | 34°C | 22°C | 36°C 1995 | 19°C 2000 | 1% |
| Jan 21 | 34°C | 22°C | 36°C 1998 | 18°C 2005 | 1% |
| Jan 22 | 34°C | 22°C | 36°C 1995 | 17°C 2009 | 1% |
| Jan 23 | 34°C | 22°C | 36°C 1995 | 17°C 2009 | 1% |
| Jan 24 | 34°C | 22°C | 37°C 1998 | 19°C 2016 | 1% |
| Jan 25 | 34°C | 22°C | 38°C 2002 | 19°C 2010 | 1% |
| Jan 26 | 34°C | 22°C | 36°C 1998 | 19°C 2003 | 1% |
| Jan 27 | 34°C | 22°C | 37°C 1998 | 17°C 2000 | 1% |
| Jan 28 | 34°C | 22°C | 37°C 1998 | 18°C 1993 | 1% |
| Jan 29 | 34°C | 22°C | 36°C 1993 | 19°C 2000 | 1% |
| Jan 30 | 34°C | 22°C | 37°C 2002 | 20°C 2011 | 1% |
| Jan 31 | 34°C | 22°C | 36°C 1991 | 21°C 2009 | 1% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 6:16 AM, sunset 5:36 PM
- January 31
- sunrise 6:20 AM, sunset 5:52 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.