San Rafael Weather in December
Average highs run from 27°C on December 1 to 30°C on December 31, and lows from 11°C to 14°C. Normal precipitation for the month is 40 mm over about 6 wet days.
December day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
December at a glance
- Average high
- 28°C
- Average low
- 12°C
- Precipitation
- 40 mm
- Reanalysis high
- 38°CDec 10, 2020
- Reanalysis low
- 3°CDec 3, 2001
- Daylight
- 14 h 18 min to 14 h 26 min
- Cloud cover
- 36%
- Humidity
- 39%
- Dew point
- 4°C
- Wind
- 15.5 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 |
|---|---|---|---|---|---|
| Dec 1 | 27°C | 11°C | 34°C 1994 | 5°C 2014 | 19% |
| Dec 2 | 27°C | 11°C | 35°C 2012 | 3°C 2001 | 20% |
| Dec 3 | 27°C | 11°C | 32°C 1993 | 3°C 2001 | 20% |
| Dec 4 | 27°C | 11°C | 35°C 2014 | 6°C 1994 | 20% |
| Dec 5 | 27°C | 11°C | 34°C 2014 | 4°C 1999 | 20% |
| Dec 6 | 27°C | 11°C | 34°C 2000 | 3°C 1999 | 21% |
| Dec 7 | 27°C | 11°C | 33°C 1994 | 5°C 2012 | 22% |
| Dec 8 | 27°C | 11°C | 35°C 1994 | 4°C 2001 | 22% |
| Dec 9 | 28°C | 12°C | 34°C 2012 | 6°C 1996 | 21% |
| Dec 10 | 28°C | 12°C | 38°C 2020 | 6°C 1991 | 21% |
| Dec 11 | 28°C | 12°C | 34°C 1993 | 3°C 1991 | 22% |
| Dec 12 | 28°C | 12°C | 35°C 1994 | 4°C 2010 | 22% |
| Dec 13 | 28°C | 12°C | 33°C 2007 | 8°C 1996 | 22% |
| Dec 14 | 28°C | 12°C | 34°C 2020 | 7°C 2016 | 21% |
| Dec 15 | 28°C | 12°C | 34°C 2008 | 7°C 2003 | 20% |
| Dec 16 | 29°C | 12°C | 36°C 2017 | 5°C 2003 | 19% |
| Dec 17 | 29°C | 12°C | 35°C 1995 | 8°C 1992 | 18% |
| Dec 18 | 29°C | 13°C | 34°C 1995 | 6°C 2015 | 18% |
| Dec 19 | 29°C | 13°C | 37°C 1995 | 7°C 2015 | 18% |
| Dec 20 | 29°C | 13°C | 35°C 2017 | 6°C 2014 | 18% |
| Dec 21 | 29°C | 13°C | 34°C 2003 | 5°C 2014 | 17% |
| Dec 22 | 29°C | 13°C | 34°C 2010 | 3°C 2014 | 18% |
| Dec 23 | 29°C | 13°C | 35°C 2019 | 7°C 2014 | 18% |
| Dec 24 | 29°C | 13°C | 37°C 2019 | 6°C 2011 | 18% |
| Dec 25 | 29°C | 13°C | 34°C 2001 | 8°C 2006 | 19% |
| Dec 26 | 29°C | 14°C | 35°C 2006 | 7°C 2012 | 19% |
| Dec 27 | 29°C | 14°C | 34°C 1995 | 8°C 2012 | 19% |
| Dec 28 | 29°C | 14°C | 33°C 1995 | 6°C 2003 | 20% |
| Dec 29 | 30°C | 14°C | 35°C 2017 | 9°C 2003 | 21% |
| Dec 30 | 30°C | 14°C | 37°C 1994 | 9°C 2018 | 23% |
| Dec 31 | 30°C | 14°C | 34°C 1994 | 10°C 2003 | 24% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- December 1
- sunrise 6:14 AM, sunset 8:32 PM
- December 31
- sunrise 6:23 AM, sunset 8:49 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.