San Weather in May

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

Average highs run from 41°C on May 1 to 38°C on May 31, and lows from 27°C to 27°C. Normal precipitation for the month is 43 mm over about 9 wet days.

May day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

May at a glance

Average high: 40°C
Average low: 27°C
Precipitation: 43 mm
Reanalysis high: 45°CMay 13, 2016
Reanalysis low: 21°CMay 1, 1997
Daylight: 12 h 36 min to 12 h 51 min
Cloud cover: 63%
Humidity: 42%
Dew point: 17°C
Wind: 12.6 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
May 1	41°C	27°C	43°C 2016	21°C 1997	18%
May 2	41°C	27°C	43°C 2003	23°C 1994	19%
May 3	41°C	27°C	44°C 2004	22°C 1994	20%
May 4	41°C	27°C	43°C 2003	21°C 1994	20%
May 5	41°C	27°C	43°C 2003	24°C 2018	21%
May 6	40°C	27°C	45°C 2019	24°C 2003	22%
May 7	40°C	27°C	44°C 2020	23°C 2003	25%
May 8	40°C	27°C	43°C 2018	24°C 2010	26%
May 9	40°C	27°C	43°C 1993	24°C 2004	27%
May 10	40°C	27°C	43°C 2004	25°C 2007	28%
May 11	40°C	27°C	43°C 2016	24°C 1998	30%
May 12	40°C	27°C	43°C 2016	24°C 2006	31%
May 13	40°C	27°C	45°C 2016	23°C 1992	32%
May 14	40°C	27°C	44°C 2015	24°C 1992	32%
May 15	40°C	27°C	42°C 2006	24°C 2012	32%
May 16	39°C	27°C	44°C 1993	25°C 2012	32%
May 17	39°C	27°C	43°C 2002	25°C 1992	33%
May 18	39°C	27°C	43°C 2004	25°C 2014	34%
May 19	39°C	27°C	44°C 2004	23°C 2014	36%
May 20	39°C	27°C	43°C 1999	23°C 1992	36%
May 21	39°C	27°C	44°C 2007	23°C 1992	37%
May 22	39°C	27°C	43°C 2004	24°C 2011	37%
May 23	39°C	27°C	42°C 2016	24°C 2020	37%
May 24	39°C	27°C	42°C 1994	24°C 2006	38%
May 25	39°C	27°C	42°C 2004	23°C 2011	40%
May 26	39°C	27°C	44°C 2004	23°C 2011	41%
May 27	39°C	27°C	44°C 2015	22°C 2011	42%
May 28	39°C	27°C	43°C 2002	24°C 2013	42%
May 29	39°C	27°C	42°C 1998	24°C 2018	44%
May 30	38°C	27°C	43°C 1999	25°C 2006	46%
May 31	38°C	27°C	43°C 2002	25°C 1991	48%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT).

May 1: sunrise 5:59 AM, sunset 6:35 PM
May 31: sunrise 5:52 AM, sunset 6:43 PM

Every day of May: 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.