San Rafael Weather in September
Average highs run from 34°C on September 1 to 33°C on September 30, and lows from 27°C to 27°C. Normal precipitation for the month is 96 mm over about 18 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 33°C
- Average low
- 27°C
- Precipitation
- 96 mm
- Reanalysis high
- 39°CSep 9, 2019
- Reanalysis low
- 24°CSep 6, 1992
- Daylight
- 12 h 19 min to 12 h 02 min
- Cloud cover
- 56%
- Humidity
- 71%
- Dew point
- 24°C
- Wind
- 16.2 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 |
|---|---|---|---|---|---|
| Sep 1 | 34°C | 27°C | 38°C 2003 | 26°C 2007 | 46% |
| Sep 2 | 34°C | 27°C | 38°C 2003 | 25°C 1992 | 46% |
| Sep 3 | 34°C | 27°C | 38°C 2003 | 25°C 1998 | 47% |
| Sep 4 | 34°C | 27°C | 39°C 2019 | 25°C 1998 | 47% |
| Sep 5 | 34°C | 27°C | 37°C 2020 | 25°C 1992 | 47% |
| Sep 6 | 34°C | 27°C | 37°C 2009 | 24°C 1992 | 48% |
| Sep 7 | 34°C | 27°C | 38°C 2002 | 26°C 1991 | 49% |
| Sep 8 | 34°C | 27°C | 38°C 2002 | 25°C 1993 | 51% |
| Sep 9 | 34°C | 27°C | 39°C 2019 | 26°C 2008 | 52% |
| Sep 10 | 34°C | 27°C | 37°C 2019 | 26°C 2008 | 54% |
| Sep 11 | 34°C | 27°C | 39°C 2019 | 25°C 2002 | 54% |
| Sep 12 | 34°C | 27°C | 38°C 2019 | 26°C 1992 | 56% |
| Sep 13 | 34°C | 27°C | 37°C 2008 | 26°C 1993 | 58% |
| Sep 14 | 34°C | 27°C | 37°C 2020 | 25°C 1993 | 58% |
| Sep 15 | 33°C | 27°C | 38°C 2019 | 25°C 1996 | 58% |
| Sep 16 | 33°C | 27°C | 37°C 2015 | 25°C 2000 | 59% |
| Sep 17 | 33°C | 27°C | 36°C 2016 | 25°C 2000 | 60% |
| Sep 18 | 33°C | 27°C | 38°C 2016 | 25°C 2018 | 60% |
| Sep 19 | 33°C | 27°C | 36°C 2009 | 25°C 1992 | 59% |
| Sep 20 | 33°C | 27°C | 36°C 2018 | 25°C 2006 | 60% |
| Sep 21 | 33°C | 27°C | 36°C 2018 | 25°C 2006 | 60% |
| Sep 22 | 33°C | 27°C | 38°C 2015 | 25°C 1994 | 61% |
| Sep 23 | 33°C | 27°C | 37°C 2016 | 25°C 1994 | 60% |
| Sep 24 | 33°C | 27°C | 38°C 2016 | 25°C 1999 | 58% |
| Sep 25 | 33°C | 27°C | 37°C 2015 | 25°C 1994 | 58% |
| Sep 26 | 33°C | 27°C | 38°C 2015 | 25°C 2000 | 58% |
| Sep 27 | 33°C | 27°C | 38°C 2015 | 25°C 1999 | 58% |
| Sep 28 | 33°C | 27°C | 37°C 2015 | 25°C 1994 | 57% |
| Sep 29 | 33°C | 27°C | 38°C 2020 | 25°C 1994 | 58% |
| Sep 30 | 33°C | 27°C | 37°C 2009 | 25°C 1996 | 59% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-4).
- September 1
- sunrise 6:37 AM, sunset 6:56 PM
- September 30
- sunrise 6:36 AM, sunset 6:38 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.