San Francisco Weather in August
Average highs run from 32°C on August 1 to 31°C on August 31, and lows from 24°C to 24°C. Normal precipitation for the month is 164 mm over about 22 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
- 32°C
- Average low
- 24°C
- Precipitation
- 164 mm
- Reanalysis high
- 38°CAug 5, 2015
- Reanalysis low
- 21°CAug 24, 2008
- Daylight
- 12 h 43 min to 12 h 23 min
- Cloud cover
- 64%
- Humidity
- 74%
- Dew point
- 22°C
- Wind
- 8.6 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 | 32°C | 24°C | 37°C 2014 | 22°C 2008 | 60% |
| Aug 2 | 32°C | 24°C | 37°C 1993 | 22°C 2002 | 60% |
| Aug 3 | 32°C | 24°C | 37°C 2015 | 23°C 2009 | 60% |
| Aug 4 | 32°C | 24°C | 38°C 2015 | 22°C 2008 | 60% |
| Aug 5 | 32°C | 24°C | 38°C 2015 | 23°C 1997 | 62% |
| Aug 6 | 32°C | 24°C | 37°C 2014 | 22°C 2008 | 62% |
| Aug 7 | 32°C | 24°C | 37°C 2015 | 23°C 1995 | 63% |
| Aug 8 | 32°C | 24°C | 37°C 1993 | 22°C 1999 | 64% |
| Aug 9 | 32°C | 24°C | 37°C 1991 | 22°C 1998 | 65% |
| Aug 10 | 32°C | 24°C | 35°C 2018 | 22°C 2009 | 66% |
| Aug 11 | 32°C | 24°C | 36°C 1994 | 22°C 1999 | 67% |
| Aug 12 | 32°C | 24°C | 37°C 1991 | 21°C 1999 | 67% |
| Aug 13 | 32°C | 24°C | 37°C 2015 | 22°C 2007 | 69% |
| Aug 14 | 32°C | 24°C | 37°C 2015 | 22°C 2017 | 70% |
| Aug 15 | 32°C | 24°C | 36°C 1996 | 22°C 2014 | 71% |
| Aug 16 | 32°C | 24°C | 36°C 2001 | 22°C 2000 | 72% |
| Aug 17 | 32°C | 24°C | 38°C 2001 | 22°C 1992 | 73% |
| Aug 18 | 32°C | 24°C | 37°C 2015 | 22°C 2017 | 74% |
| Aug 19 | 32°C | 24°C | 38°C 1994 | 23°C 1999 | 75% |
| Aug 20 | 32°C | 24°C | 36°C 1994 | 22°C 1996 | 75% |
| Aug 21 | 32°C | 24°C | 37°C 1993 | 22°C 2000 | 76% |
| Aug 22 | 31°C | 24°C | 37°C 2015 | 22°C 2000 | 76% |
| Aug 23 | 31°C | 24°C | 37°C 1994 | 22°C 2000 | 76% |
| Aug 24 | 31°C | 24°C | 38°C 1994 | 21°C 2008 | 76% |
| Aug 25 | 31°C | 24°C | 37°C 1994 | 22°C 1999 | 75% |
| Aug 26 | 31°C | 24°C | 36°C 1994 | 22°C 2013 | 75% |
| Aug 27 | 31°C | 24°C | 37°C 1991 | 22°C 2020 | 76% |
| Aug 28 | 31°C | 24°C | 37°C 1991 | 22°C 2004 | 78% |
| Aug 29 | 31°C | 24°C | 38°C 1991 | 23°C 1996 | 79% |
| Aug 30 | 31°C | 24°C | 36°C 1992 | 22°C 2012 | 80% |
| Aug 31 | 31°C | 24°C | 36°C 1994 | 23°C 1999 | 79% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- August 1
- sunrise 5:37 AM, sunset 6:20 PM
- August 31
- sunrise 5:41 AM, sunset 6:04 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.