San Rafael Weather in August
Average highs run from 91°F on August 1 to 87°F on August 31, and lows from 56°F to 50°F. Normal precipitation for the month is 1.83 in over about 10 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
- 89°F
- Average low
- 53°F
- Precipitation
- 1.83 in
- Record high
- 102°FAug 12, 2002
- Record low
- 34°FAug 24, 1968
- Chance of a freeze
- 0%
- Days of 90°F or more
- 14.2
- Daylight
- 13 h 53 min to 12 h 55 min
- Cloud cover
- 52%
- Humidity
- 50%
- Dew point
- 46°F
- Wind
- 6.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 91°F | 56°F | 98°F 1995 | 44°F 1975 | 32% | 0% |
| Aug 2 | 91°F | 55°F | 97°F 2000 | 46°F 1977 | 32% | 0% |
| Aug 3 | 90°F | 55°F | 100°F 2000 | 43°F 1975 | 32% | 0% |
| Aug 4 | 90°F | 55°F | 98°F 1995 | 39°F 1975 | 32% | 0% |
| Aug 5 | 90°F | 55°F | 101°F 2009 | 40°F 1976 | 32% | 0% |
| Aug 6 | 90°F | 55°F | 98°F 1981 | 39°F 1976 | 32% | 0% |
| Aug 7 | 90°F | 55°F | 98°F 2011 | 45°F 1953 | 32% | 0% |
| Aug 8 | 90°F | 55°F | 98°F 1994 | 45°F 1956 | 32% | 0% |
| Aug 9 | 90°F | 54°F | 100°F 2003 | 45°F 2009 | 32% | 0% |
| Aug 10 | 90°F | 54°F | 99°F 2011 | 45°F 2009 | 32% | 0% |
| Aug 11 | 90°F | 54°F | 99°F 2002 | 43°F 1999 | 32% | 0% |
| Aug 12 | 90°F | 54°F | 102°F 2002 | 39°F 1974 | 32% | 0% |
| Aug 13 | 89°F | 54°F | 101°F 2002 | 42°F 1985 | 31% | 0% |
| Aug 14 | 89°F | 54°F | 100°F 2002 | 43°F 1974 | 31% | 0% |
| Aug 15 | 89°F | 54°F | 101°F 2002 | 42°F 1968 | 31% | 0% |
| Aug 16 | 89°F | 53°F | 97°F 2002 | 40°F 1985 | 31% | 0% |
| Aug 17 | 89°F | 53°F | 97°F 2002 | 42°F 1975 | 31% | 0% |
| Aug 18 | 89°F | 53°F | 97°F 2011 | 41°F 1975 | 31% | 0% |
| Aug 19 | 89°F | 53°F | 95°F 2007 | 42°F 1968 | 31% | 0% |
| Aug 20 | 89°F | 53°F | 96°F 1986 | 41°F 1987 | 31% | 0% |
| Aug 21 | 89°F | 53°F | 95°F 2003 | 40°F 1980 | 31% | 0% |
| Aug 22 | 88°F | 52°F | 98°F 2007 | 37°F 1964 | 31% | 0% |
| Aug 23 | 88°F | 52°F | 98°F 2007 | 39°F 1964 | 31% | 0% |
| Aug 24 | 88°F | 52°F | 100°F 2011 | 34°F 1968 | 30% | 0% |
| Aug 25 | 88°F | 52°F | 96°F 2007 | 36°F 1975 | 30% | 0% |
| Aug 26 | 88°F | 52°F | 96°F 2002 | 35°F 1975 | 30% | 0% |
| Aug 27 | 88°F | 51°F | 98°F 2001 | 42°F 1954 | 30% | 0% |
| Aug 28 | 88°F | 51°F | 97°F 2011 | 38°F 1954 | 29% | 0% |
| Aug 29 | 87°F | 51°F | 96°F 2005 | 40°F 1975 | 29% | 0% |
| Aug 30 | 87°F | 51°F | 97°F 2011 | 36°F 1975 | 28% | 0% |
| Aug 31 | 87°F | 50°F | 98°F 2011 | 39°F 1975 | 28% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- August 1
- sunrise 6:21 AM, sunset 8:14 PM
- August 31
- sunrise 6:44 AM, sunset 7:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00293682 (Grants AP), public domain. Records: NOAA GHCN-Daily, station USC00293682, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.