San Isidro Weather in December

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

Average highs run from 31°C on December 1 to 32°C on December 31, and lows from 16°C to 19°C. Normal precipitation for the month is 81 mm over about 9 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: 32°C
Average low: 18°C
Precipitation: 81 mm
Reanalysis high: 42°CDec 21, 2003
Reanalysis low: 8°CDec 13, 2010
Daylight: 13 h 49 min to 13 h 56 min
Cloud cover: 56%
Humidity: 55%
Dew point: 13°C
Wind: 14.4 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	31°C	16°C	38°C 1994	11°C 2001	32%
Dec 2	31°C	16°C	39°C 1994	10°C 2018	32%
Dec 3	31°C	16°C	41°C 1993	11°C 2018	33%
Dec 4	31°C	17°C	39°C 2013	12°C 2001	33%
Dec 5	31°C	17°C	37°C 2012	10°C 2020	33%
Dec 6	31°C	17°C	40°C 2014	9°C 1999	33%
Dec 7	31°C	17°C	35°C 1997	9°C 1999	33%
Dec 8	31°C	17°C	37°C 2017	12°C 2001	33%
Dec 9	31°C	17°C	38°C 1994	12°C 2002	32%
Dec 10	31°C	17°C	40°C 2012	12°C 1996	32%
Dec 11	31°C	17°C	37°C 2019	13°C 1996	31%
Dec 12	31°C	17°C	38°C 1993	10°C 2010	31%
Dec 13	31°C	17°C	37°C 2018	8°C 2010	31%
Dec 14	32°C	17°C	35°C 2012	11°C 2010	32%
Dec 15	32°C	18°C	36°C 2005	12°C 1991	31%
Dec 16	32°C	18°C	41°C 2012	12°C 2000	30%
Dec 17	32°C	18°C	39°C 1995	12°C 2003	32%
Dec 18	32°C	18°C	40°C 1995	14°C 2017	32%
Dec 19	32°C	18°C	39°C 2012	12°C 2015	32%
Dec 20	32°C	18°C	40°C 1995	11°C 2015	32%
Dec 21	32°C	18°C	42°C 2003	13°C 2014	33%
Dec 22	32°C	18°C	37°C 2011	12°C 1998	34%
Dec 23	32°C	18°C	39°C 2006	10°C 2014	36%
Dec 24	32°C	18°C	41°C 2012	11°C 2002	37%
Dec 25	32°C	18°C	40°C 2016	13°C 2011	39%
Dec 26	32°C	18°C	40°C 1997	15°C 2012	39%
Dec 27	32°C	18°C	40°C 1998	13°C 1991	39%
Dec 28	32°C	18°C	37°C 2013	14°C 2012	39%
Dec 29	32°C	19°C	40°C 2013	13°C 2003	40%
Dec 30	32°C	19°C	39°C 2013	14°C 2004	41%
Dec 31	32°C	19°C	40°C 2012	16°C 2000	41%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-3).

December 1: sunrise 6:18 AM, sunset 8:07 PM
December 31: sunrise 6:28 AM, sunset 8:24 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.