Santa Rosa Weather in August
Average highs run from 25°C on August 1 to 26°C on August 31, and lows from 15°C to 16°C. Normal precipitation for the month is 9 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
- 25°C
- Average low
- 15°C
- Precipitation
- 9 mm
- Reanalysis high
- 29°CAug 25, 2010
- Reanalysis low
- 10°CAug 16, 1999
- Daylight
- 11 h 38 min to 11 h 54 min
- Cloud cover
- 60%
- Humidity
- 63%
- Dew point
- 11°C
- Wind
- 6.1 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 | 25°C | 15°C | 27°C 2005 | 12°C 1993 | 5% |
| Aug 2 | 25°C | 15°C | 28°C 2005 | 12°C 2004 | 4% |
| Aug 3 | 25°C | 15°C | 28°C 1998 | 12°C 1993 | 5% |
| Aug 4 | 25°C | 15°C | 28°C 1998 | 12°C 1993 | 6% |
| Aug 5 | 25°C | 15°C | 28°C 2009 | 10°C 2019 | 6% |
| Aug 6 | 25°C | 15°C | 27°C 2015 | 10°C 2010 | 6% |
| Aug 7 | 25°C | 15°C | 28°C 2012 | 10°C 1993 | 6% |
| Aug 8 | 25°C | 15°C | 29°C 2012 | 12°C 2010 | 6% |
| Aug 9 | 25°C | 15°C | 28°C 2012 | 12°C 1997 | 6% |
| Aug 10 | 25°C | 15°C | 28°C 2012 | 11°C 1997 | 6% |
| Aug 11 | 25°C | 15°C | 28°C 2006 | 12°C 1999 | 6% |
| Aug 12 | 25°C | 15°C | 28°C 2006 | 11°C 1997 | 6% |
| Aug 13 | 25°C | 15°C | 28°C 2007 | 13°C 1994 | 7% |
| Aug 14 | 25°C | 15°C | 28°C 2007 | 13°C 1994 | 7% |
| Aug 15 | 25°C | 15°C | 28°C 2007 | 12°C 1991 | 7% |
| Aug 16 | 25°C | 15°C | 28°C 1998 | 10°C 1999 | 8% |
| Aug 17 | 25°C | 15°C | 28°C 2016 | 11°C 1999 | 8% |
| Aug 18 | 25°C | 15°C | 29°C 2010 | 11°C 1999 | 7% |
| Aug 19 | 25°C | 15°C | 28°C 2015 | 11°C 1999 | 7% |
| Aug 20 | 25°C | 15°C | 29°C 2009 | 12°C 1991 | 7% |
| Aug 21 | 25°C | 15°C | 28°C 1994 | 12°C 2014 | 6% |
| Aug 22 | 25°C | 15°C | 28°C 1994 | 12°C 2001 | 7% |
| Aug 23 | 25°C | 15°C | 28°C 2014 | 12°C 2016 | 6% |
| Aug 24 | 25°C | 15°C | 29°C 2010 | 14°C 2011 | 7% |
| Aug 25 | 26°C | 15°C | 29°C 2010 | 13°C 1994 | 6% |
| Aug 26 | 26°C | 15°C | 28°C 2010 | 14°C 2013 | 6% |
| Aug 27 | 26°C | 15°C | 28°C 2005 | 13°C 1992 | 6% |
| Aug 28 | 26°C | 16°C | 29°C 2020 | 13°C 2013 | 7% |
| Aug 29 | 26°C | 16°C | 29°C 2019 | 12°C 2013 | 8% |
| Aug 30 | 26°C | 16°C | 28°C 2019 | 13°C 2013 | 8% |
| Aug 31 | 26°C | 16°C | 29°C 1995 | 14°C 2013 | 8% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- August 1
- sunrise 6:17 AM, sunset 5:55 PM
- August 31
- sunrise 6:03 AM, sunset 5:57 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.