Santa Rosa Weather in August
Average highs run from 102°F on August 1 to 101°F on August 31, and lows from 77°F to 73°F. Normal precipitation for the month is 1.09 in over about 5 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 102°F
- Average low
- 75°F
- Precipitation
- 1.09 in
- Record high
- 114°FAug 1, 1993
- Record low
- 62°FAug 3, 2005
- Chance of a freeze
- 0%
- Days of 90°F or more
- 30.1
- Daylight
- 13 h 43 min to 12 h 51 min
- Cloud cover
- 49%
- Humidity
- 40%
- Dew point
- 58°F
- Wind
- 6.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 102°F | 77°F | 114°F 1993 | 70°F 2016 | 18% |
| Aug 2 | 102°F | 76°F | 113°F 2026 | 68°F 1990 | 18% |
| Aug 3 | 102°F | 76°F | 113°F 2026 | 62°F 2005 | 18% |
| Aug 4 | 102°F | 76°F | 113°F 1995 | 68°F 2005 | 18% |
| Aug 5 | 102°F | 76°F | 113°F 1995 | 71°F 2005 | 18% |
| Aug 6 | 102°F | 76°F | 113°F 1995 | 70°F 2002 | 18% |
| Aug 7 | 102°F | 76°F | 114°F 2025 | 69°F 2005 | 18% |
| Aug 8 | 102°F | 76°F | 114°F 2025 | 63°F 2005 | 18% |
| Aug 9 | 102°F | 76°F | 111°F 1995 | 68°F 2001 | 18% |
| Aug 10 | 102°F | 76°F | 113°F 2003 | 66°F 2006 | 18% |
| Aug 11 | 102°F | 76°F | 110°F 1994 | 66°F 2006 | 18% |
| Aug 12 | 102°F | 76°F | 111°F 1996 | 68°F 2005 | 18% |
| Aug 13 | 102°F | 76°F | 112°F 2012 | 65°F 2005 | 18% |
| Aug 14 | 102°F | 76°F | 112°F 2020 | 66°F 1990 | 18% |
| Aug 15 | 102°F | 75°F | 111°F 2015 | 66°F 1990 | 18% |
| Aug 16 | 102°F | 75°F | 110°F 1992 | 71°F 2003 | 18% |
| Aug 17 | 102°F | 75°F | 112°F 2020 | 67°F 2021 | 18% |
| Aug 18 | 102°F | 75°F | 113°F 2020 | 72°F 1997 | 18% |
| Aug 19 | 102°F | 75°F | 112°F 2026 | 71°F 2003 | 18% |
| Aug 20 | 102°F | 75°F | 109°F 2019 | 68°F 1995 | 18% |
| Aug 21 | 102°F | 75°F | 111°F 2019 | 71°F 1990 | 18% |
| Aug 22 | 102°F | 75°F | 113°F 2026 | 69°F 2023 | 18% |
| Aug 23 | 102°F | 74°F | 112°F 2026 | 69°F 2024 | 18% |
| Aug 24 | 102°F | 74°F | 111°F 2020 | 66°F 1992 | 18% |
| Aug 25 | 102°F | 74°F | 111°F 2001 | 69°F 1992 | 17% |
| Aug 26 | 102°F | 74°F | 112°F 2001 | 66°F 2002 | 17% |
| Aug 27 | 102°F | 74°F | 110°F 2002 | 67°F 1992 | 17% |
| Aug 28 | 102°F | 74°F | 114°F 1998 | 68°F 1993 | 17% |
| Aug 29 | 102°F | 73°F | 111°F 2023 | 69°F 2000 | 17% |
| Aug 30 | 101°F | 73°F | 111°F 2023 | 66°F 1992 | 17% |
| Aug 31 | 101°F | 73°F | 109°F 1995 | 67°F 2000 | 16% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- August 1
- sunrise 5:43 AM, sunset 7:26 PM
- August 31
- sunrise 6:03 AM, sunset 6:54 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00020404 (Arizona City), public domain. Records: NOAA GHCN-Daily, station USC00026513, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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.