San Luis Weather in May

NASA POWER reanalysis for the half-degree grid cell around San Luis, 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 May 1 to 31°C on May 31, and lows from 24°C to 25°C. Normal precipitation for the month is 57 mm over about 11 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: 31°C
Average low: 24°C
Precipitation: 57 mm
Reanalysis high: 35°CMay 23, 1997
Reanalysis low: 19°CMay 3, 1992
Daylight: 12 h 53 min to 13 h 16 min
Cloud cover: 56%
Humidity: 72%
Dew point: 21°C
Wind: 13.3 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	31°C	24°C	33°C 2016	20°C 1993	26%
May 2	31°C	24°C	33°C 1997	20°C 1992	26%
May 3	31°C	24°C	34°C 2020	19°C 1992	27%
May 4	31°C	24°C	33°C 1991	21°C 1992	26%
May 5	31°C	24°C	34°C 2020	20°C 2006	26%
May 6	31°C	24°C	33°C 2007	21°C 2006	28%
May 7	31°C	24°C	33°C 2005	21°C 2001	28%
May 8	31°C	24°C	33°C 1998	21°C 2016	28%
May 9	31°C	24°C	33°C 1998	22°C 1993	28%
May 10	31°C	24°C	33°C 2006	21°C 2011	30%
May 11	31°C	24°C	34°C 2006	22°C 1993	31%
May 12	31°C	24°C	33°C 2003	22°C 2011	33%
May 13	31°C	24°C	34°C 1998	22°C 2011	34%
May 14	31°C	24°C	34°C 1998	22°C 2011	35%
May 15	31°C	24°C	33°C 2002	22°C 1998	37%
May 16	31°C	24°C	34°C 2002	21°C 1998	39%
May 17	31°C	24°C	33°C 2003	22°C 1998	40%
May 18	31°C	24°C	33°C 2003	22°C 1998	42%
May 19	31°C	24°C	33°C 1998	23°C 1998	43%
May 20	31°C	24°C	33°C 1998	22°C 2000	44%
May 21	31°C	24°C	33°C 1997	22°C 2000	43%
May 22	31°C	24°C	34°C 1997	22°C 1992	43%
May 23	31°C	24°C	35°C 1997	21°C 1992	43%
May 24	31°C	25°C	33°C 1997	21°C 1992	42%
May 25	31°C	25°C	33°C 1997	22°C 2016	41%
May 26	31°C	25°C	33°C 2017	22°C 1993	40%
May 27	31°C	25°C	34°C 2006	22°C 1993	39%
May 28	31°C	25°C	34°C 2020	23°C 1995	38%
May 29	31°C	25°C	33°C 2003	23°C 2009	37%
May 30	31°C	25°C	33°C 2005	24°C 2014	35%
May 31	31°C	25°C	33°C 1996	23°C 2011	34%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-4).

May 1: sunrise 6:34 AM, sunset 7:27 PM
May 31: sunrise 6:23 AM, sunset 7:39 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 2026-09-27. Sun and moon: computed with the NOAA solar equations and Meeus.