San Luis Weather in December
Average highs run from 30°C on December 1 to 29°C on December 31, and lows from 23°C to 22°C. Normal precipitation for the month is 18 mm over about 4 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
- 29°C
- Average low
- 22°C
- Precipitation
- 18 mm
- Reanalysis high
- 32°CDec 3, 2002
- Reanalysis low
- 15°CDec 15, 2010
- Daylight
- 11 h 00 min to 10 h 55 min
- Cloud cover
- 40%
- Humidity
- 74%
- Dew point
- 20°C
- Wind
- 15.8 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 | 30°C | 23°C | 31°C 2002 | 21°C 1999 | 17% |
| Dec 2 | 30°C | 23°C | 32°C 2002 | 19°C 1999 | 16% |
| Dec 3 | 30°C | 23°C | 32°C 2002 | 20°C 1996 | 15% |
| Dec 4 | 30°C | 23°C | 32°C 2018 | 20°C 2010 | 15% |
| Dec 5 | 30°C | 22°C | 32°C 2018 | 19°C 2010 | 14% |
| Dec 6 | 30°C | 22°C | 32°C 2003 | 19°C 2010 | 13% |
| Dec 7 | 30°C | 22°C | 32°C 2016 | 18°C 2010 | 13% |
| Dec 8 | 30°C | 22°C | 32°C 2002 | 17°C 2010 | 13% |
| Dec 9 | 30°C | 22°C | 31°C 2002 | 19°C 2020 | 12% |
| Dec 10 | 30°C | 22°C | 31°C 2019 | 18°C 1996 | 12% |
| Dec 11 | 30°C | 22°C | 32°C 2019 | 19°C 1996 | 12% |
| Dec 12 | 30°C | 22°C | 31°C 1994 | 19°C 2010 | 12% |
| Dec 13 | 30°C | 22°C | 31°C 2003 | 19°C 2010 | 13% |
| Dec 14 | 29°C | 22°C | 31°C 2016 | 16°C 2010 | 13% |
| Dec 15 | 29°C | 22°C | 32°C 2019 | 15°C 2010 | 14% |
| Dec 16 | 29°C | 22°C | 31°C 2017 | 17°C 2010 | 13% |
| Dec 17 | 29°C | 22°C | 31°C 2018 | 17°C 1997 | 13% |
| Dec 18 | 29°C | 22°C | 31°C 2016 | 19°C 1997 | 13% |
| Dec 19 | 29°C | 22°C | 31°C 2016 | 19°C 1996 | 13% |
| Dec 20 | 29°C | 22°C | 31°C 2019 | 19°C 2010 | 13% |
| Dec 21 | 29°C | 22°C | 31°C 2002 | 18°C 2010 | 12% |
| Dec 22 | 29°C | 22°C | 31°C 2002 | 18°C 2010 | 12% |
| Dec 23 | 29°C | 22°C | 31°C 2016 | 17°C 2010 | 12% |
| Dec 24 | 29°C | 22°C | 31°C 2006 | 17°C 2010 | 12% |
| Dec 25 | 29°C | 22°C | 32°C 1997 | 19°C 2010 | 11% |
| Dec 26 | 29°C | 22°C | 31°C 2002 | 18°C 1995 | 10% |
| Dec 27 | 29°C | 22°C | 31°C 2002 | 16°C 2010 | 10% |
| Dec 28 | 29°C | 22°C | 31°C 2006 | 15°C 2010 | 10% |
| Dec 29 | 29°C | 22°C | 31°C 2016 | 17°C 2010 | 10% |
| Dec 30 | 29°C | 22°C | 31°C 1998 | 17°C 2010 | 10% |
| Dec 31 | 29°C | 22°C | 31°C 1998 | 18°C 2010 | 9% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- December 1
- sunrise 6:22 AM, sunset 5:22 PM
- December 31
- sunrise 6:39 AM, sunset 5:34 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 2026-09-27. Sun and moon: computed with the NOAA solar equations and Meeus.