San Francisco Weather in August
Average highs run from 19°C on August 1 to 23°C on August 31, and lows from 5°C to 8°C. Normal precipitation for the month is 25 mm over about 3 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 21°C
- Average low
- 7°C
- Precipitation
- 25 mm
- Reanalysis high
- 38°CAug 29, 1997
- Reanalysis low
- -4°CAug 2, 1991
- Daylight
- 10 h 38 min to 11 h 26 min
- Cloud cover
- 50%
- Humidity
- 68%
- Dew point
- 6°C
- Wind
- 15.1 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 |
|---|---|---|---|---|---|
| Aug 1 | 19°C | 5°C | 27°C 1996 | -2°C 1991 | 9% |
| Aug 2 | 19°C | 5°C | 30°C 2014 | -4°C 1991 | 9% |
| Aug 3 | 19°C | 5°C | 31°C 2020 | -3°C 1991 | 9% |
| Aug 4 | 19°C | 5°C | 31°C 2020 | -3°C 1995 | 9% |
| Aug 5 | 19°C | 5°C | 33°C 2020 | -2°C 2010 | 9% |
| Aug 6 | 19°C | 5°C | 29°C 2015 | 0°C 2007 | 9% |
| Aug 7 | 19°C | 5°C | 29°C 2013 | 0°C 2007 | 9% |
| Aug 8 | 20°C | 6°C | 23°C 1996 | 0°C 2005 | 9% |
| Aug 9 | 20°C | 6°C | 27°C 2020 | -1°C 1993 | 9% |
| Aug 10 | 20°C | 6°C | 28°C 1999 | 0°C 2013 | 10% |
| Aug 11 | 20°C | 6°C | 30°C 2012 | -1°C 2007 | 10% |
| Aug 12 | 20°C | 6°C | 29°C 2011 | 0°C 2000 | 11% |
| Aug 13 | 20°C | 6°C | 30°C 2004 | -1°C 2014 | 11% |
| Aug 14 | 20°C | 6°C | 32°C 1997 | -2°C 1999 | 11% |
| Aug 15 | 20°C | 6°C | 28°C 2009 | -2°C 1999 | 11% |
| Aug 16 | 21°C | 6°C | 30°C 1991 | 0°C 1999 | 10% |
| Aug 17 | 21°C | 6°C | 29°C 1991 | -1°C 1993 | 10% |
| Aug 18 | 21°C | 7°C | 32°C 1996 | 0°C 1993 | 10% |
| Aug 19 | 21°C | 7°C | 33°C 1996 | 1°C 1995 | 10% |
| Aug 20 | 21°C | 7°C | 31°C 2014 | -1°C 2018 | 10% |
| Aug 21 | 22°C | 7°C | 33°C 2014 | -1°C 2011 | 10% |
| Aug 22 | 22°C | 7°C | 32°C 2014 | -1°C 2011 | 11% |
| Aug 23 | 22°C | 7°C | 36°C 1996 | -1°C 2011 | 12% |
| Aug 24 | 22°C | 7°C | 36°C 1996 | 0°C 2013 | 12% |
| Aug 25 | 22°C | 8°C | 35°C 2002 | 1°C 2018 | 12% |
| Aug 26 | 22°C | 8°C | 35°C 2008 | 0°C 2013 | 13% |
| Aug 27 | 22°C | 8°C | 35°C 2009 | 0°C 2013 | 14% |
| Aug 28 | 22°C | 8°C | 37°C 1997 | 1°C 2000 | 14% |
| Aug 29 | 22°C | 8°C | 38°C 1997 | 2°C 2003 | 15% |
| Aug 30 | 23°C | 8°C | 35°C 2009 | 2°C 2007 | 15% |
| Aug 31 | 23°C | 8°C | 34°C 2004 | 2°C 2002 | 16% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- August 1
- sunrise 7:56 AM, sunset 6:34 PM
- August 31
- sunrise 7:26 AM, sunset 6:52 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.