San Jose Weather in December

NASA POWER reanalysis for the half-degree grid cell around San Jose, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 28°C on December 1 to 27°C on December 31, and lows from 24°C to 23°C. Normal precipitation for the month is 177 mm over about 22 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: 27°C
Average low: 24°C
Precipitation: 177 mm
Reanalysis high: 30°CDec 23, 1997
Reanalysis low: 20°CDec 29, 1996
Daylight: 11 h 27 min to 11 h 25 min
Cloud cover: 70%
Humidity: 87%
Dew point: 23°C
Wind: 20.2 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	28°C	24°C	29°C 1997	22°C 2003	72%
Dec 2	28°C	24°C	30°C 2012	22°C 2003	72%
Dec 3	28°C	24°C	30°C 2012	22°C 2009	72%
Dec 4	28°C	24°C	29°C 2004	22°C 2009	72%
Dec 5	28°C	24°C	29°C 2015	22°C 1991	72%
Dec 6	28°C	24°C	30°C 2019	22°C 1991	72%
Dec 7	28°C	24°C	29°C 2019	22°C 2009	72%
Dec 8	28°C	24°C	30°C 2017	22°C 2009	71%
Dec 9	28°C	24°C	30°C 1997	23°C 1992	71%
Dec 10	27°C	24°C	30°C 2015	23°C 1994	71%
Dec 11	27°C	24°C	30°C 2015	22°C 1994	70%
Dec 12	27°C	24°C	29°C 2015	23°C 1994	70%
Dec 13	27°C	24°C	29°C 1997	22°C 1992	69%
Dec 14	27°C	24°C	29°C 2015	23°C 1996	68%
Dec 15	27°C	24°C	29°C 2012	23°C 2008	67%
Dec 16	27°C	24°C	29°C 2012	22°C 2008	66%
Dec 17	27°C	24°C	29°C 1997	22°C 2008	66%
Dec 18	27°C	24°C	29°C 2012	22°C 2008	64%
Dec 19	27°C	24°C	28°C 2010	22°C 1994	64%
Dec 20	27°C	24°C	29°C 1997	22°C 2003	64%
Dec 21	27°C	24°C	29°C 1997	22°C 2003	64%
Dec 22	27°C	24°C	29°C 1997	22°C 1999	62%
Dec 23	27°C	24°C	30°C 1997	22°C 1999	62%
Dec 24	27°C	24°C	29°C 1997	22°C 1999	62%
Dec 25	27°C	24°C	28°C 2018	21°C 1996	62%
Dec 26	27°C	24°C	29°C 2018	21°C 1996	61%
Dec 27	27°C	23°C	29°C 2018	21°C 1996	59%
Dec 28	27°C	23°C	29°C 1991	21°C 1996	56%
Dec 29	27°C	23°C	29°C 2012	20°C 1996	56%
Dec 30	27°C	23°C	29°C 2000	20°C 1996	54%
Dec 31	27°C	23°C	29°C 2002	20°C 1996	53%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+8).

December 1: sunrise 6:01 AM, sunset 5:28 PM
December 31: sunrise 6:16 AM, sunset 5:41 PM

Every day of December: sun and moon

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.