Santa Rosa Weather in August
Average highs run from 27°C on August 1 to 31°C on August 31, and lows from 11°C to 14°C. Normal precipitation for the month is 6 mm over about 0 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
- 29°C
- Average low
- 13°C
- Precipitation
- 6 mm
- Reanalysis high
- 42°CAug 28, 2002
- Reanalysis low
- -1°CAug 16, 1999
- Daylight
- 11 h 04 min to 11 h 38 min
- Cloud cover
- 44%
- Humidity
- 40%
- Dew point
- 5°C
- Wind
- 11.5 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 | 27°C | 11°C | 35°C 2014 | 1°C 1993 | 1% |
| Aug 2 | 27°C | 11°C | 37°C 2014 | 2°C 1992 | 1% |
| Aug 3 | 27°C | 11°C | 40°C 2014 | 2°C 1991 | 1% |
| Aug 4 | 28°C | 12°C | 36°C 2020 | 2°C 2010 | 2% |
| Aug 5 | 28°C | 12°C | 36°C 2020 | 1°C 2010 | 2% |
| Aug 6 | 28°C | 12°C | 40°C 2015 | 2°C 2010 | 2% |
| Aug 7 | 28°C | 12°C | 39°C 2015 | 6°C 2007 | 2% |
| Aug 8 | 28°C | 12°C | 36°C 2015 | 5°C 1999 | 3% |
| Aug 9 | 28°C | 12°C | 35°C 2015 | 4°C 1992 | 3% |
| Aug 10 | 28°C | 12°C | 38°C 2020 | 5°C 2013 | 4% |
| Aug 11 | 29°C | 12°C | 38°C 2011 | 5°C 2007 | 4% |
| Aug 12 | 29°C | 12°C | 38°C 2011 | 4°C 2000 | 4% |
| Aug 13 | 29°C | 12°C | 37°C 1995 | 7°C 2000 | 5% |
| Aug 14 | 29°C | 12°C | 38°C 1995 | 2°C 1999 | 5% |
| Aug 15 | 29°C | 12°C | 38°C 2009 | 2°C 1999 | 5% |
| Aug 16 | 29°C | 12°C | 39°C 2008 | -1°C 1999 | 5% |
| Aug 17 | 29°C | 12°C | 38°C 2019 | 3°C 1999 | 5% |
| Aug 18 | 29°C | 13°C | 38°C 2002 | 5°C 2007 | 5% |
| Aug 19 | 29°C | 13°C | 37°C 2000 | 6°C 2007 | 4% |
| Aug 20 | 30°C | 13°C | 37°C 2003 | 5°C 2007 | 4% |
| Aug 21 | 30°C | 13°C | 38°C 2005 | 3°C 2018 | 4% |
| Aug 22 | 30°C | 13°C | 38°C 2012 | 5°C 2011 | 4% |
| Aug 23 | 30°C | 13°C | 39°C 2014 | 5°C 2020 | 4% |
| Aug 24 | 30°C | 14°C | 39°C 1996 | 5°C 2011 | 4% |
| Aug 25 | 30°C | 14°C | 39°C 2002 | 6°C 2013 | 4% |
| Aug 26 | 30°C | 14°C | 40°C 2016 | 4°C 2013 | 5% |
| Aug 27 | 31°C | 14°C | 40°C 2008 | 6°C 2013 | 4% |
| Aug 28 | 31°C | 14°C | 42°C 2002 | 6°C 2012 | 4% |
| Aug 29 | 31°C | 14°C | 39°C 2009 | 4°C 2003 | 4% |
| Aug 30 | 31°C | 14°C | 40°C 2015 | 4°C 2003 | 4% |
| Aug 31 | 31°C | 14°C | 41°C 2015 | 7°C 2003 | 4% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- August 1
- sunrise 7:52 AM, sunset 6:56 PM
- August 31
- sunrise 7:29 AM, sunset 7:07 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.