San José Weather in December
Average highs run from 25°C on December 1 to 25°C on December 31, and lows from 17°C to 16°C. Normal precipitation for the month is 60 mm over about 13 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
- 25°C
- Average low
- 17°C
- Precipitation
- 60 mm
- Reanalysis high
- 33°CDec 2, 2018
- Reanalysis low
- 11°CDec 15, 1997
- Daylight
- 11 h 18 min to 11 h 16 min
- Cloud cover
- 62%
- Humidity
- 87%
- Dew point
- 17°C
- Wind
- 7.2 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 |
|---|---|---|---|---|---|
| Dec 1 | 25°C | 17°C | 33°C 2018 | 12°C 2011 | 47% |
| Dec 2 | 25°C | 17°C | 33°C 2018 | 14°C 2011 | 48% |
| Dec 3 | 25°C | 17°C | 33°C 2018 | 13°C 1999 | 48% |
| Dec 4 | 25°C | 17°C | 30°C 2018 | 14°C 1999 | 48% |
| Dec 5 | 25°C | 17°C | 29°C 1992 | 13°C 2007 | 47% |
| Dec 6 | 25°C | 17°C | 29°C 2016 | 15°C 2000 | 47% |
| Dec 7 | 25°C | 17°C | 30°C 2004 | 13°C 2003 | 47% |
| Dec 8 | 25°C | 17°C | 31°C 2018 | 13°C 2003 | 46% |
| Dec 9 | 25°C | 17°C | 30°C 1995 | 13°C 2017 | 45% |
| Dec 10 | 25°C | 17°C | 30°C 2004 | 11°C 2017 | 44% |
| Dec 11 | 25°C | 17°C | 29°C 1997 | 12°C 2017 | 43% |
| Dec 12 | 25°C | 17°C | 29°C 1996 | 12°C 2017 | 42% |
| Dec 13 | 25°C | 17°C | 30°C 2018 | 12°C 2017 | 42% |
| Dec 14 | 25°C | 17°C | 31°C 1992 | 11°C 2017 | 42% |
| Dec 15 | 25°C | 17°C | 32°C 1992 | 11°C 1997 | 42% |
| Dec 16 | 25°C | 17°C | 32°C 1992 | 11°C 2010 | 42% |
| Dec 17 | 25°C | 17°C | 30°C 1992 | 11°C 2010 | 42% |
| Dec 18 | 25°C | 16°C | 29°C 1996 | 13°C 1998 | 41% |
| Dec 19 | 25°C | 16°C | 31°C 2018 | 12°C 2003 | 39% |
| Dec 20 | 25°C | 16°C | 31°C 2018 | 12°C 2003 | 38% |
| Dec 21 | 25°C | 16°C | 29°C 1997 | 13°C 2003 | 37% |
| Dec 22 | 25°C | 16°C | 31°C 2004 | 13°C 2009 | 38% |
| Dec 23 | 25°C | 16°C | 31°C 2004 | 13°C 2010 | 38% |
| Dec 24 | 25°C | 16°C | 30°C 1993 | 14°C 2012 | 38% |
| Dec 25 | 25°C | 16°C | 29°C 1997 | 13°C 2012 | 38% |
| Dec 26 | 25°C | 16°C | 28°C 1997 | 12°C 2020 | 38% |
| Dec 27 | 25°C | 16°C | 31°C 2018 | 12°C 2006 | 39% |
| Dec 28 | 25°C | 16°C | 31°C 2018 | 11°C 2006 | 39% |
| Dec 29 | 25°C | 16°C | 30°C 2018 | 12°C 1999 | 38% |
| Dec 30 | 25°C | 16°C | 31°C 2018 | 12°C 1999 | 38% |
| Dec 31 | 25°C | 16°C | 30°C 2018 | 12°C 1997 | 37% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 6:05 AM, sunset 5:23 PM
- December 31
- sunrise 6:20 AM, sunset 5:36 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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.