Heroica Matamoros Weather in May

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

Average highs run from 32°C on May 1 to 34°C on May 31, and lows from 22°C to 25°C. Normal precipitation for the month is 62 mm over about 6 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: 33°C
Average low: 23°C
Precipitation: 62 mm
Reanalysis high: 42°CMay 4, 1999
Reanalysis low: 13°CMay 3, 2013
Daylight: 13 h 09 min to 13 h 38 min
Cloud cover: 52%
Humidity: 72%
Dew point: 21°C
Wind: 20.5 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	32°C	22°C	36°C 2010	17°C 2004	15%
May 2	32°C	22°C	36°C 2008	14°C 2004	15%
May 3	32°C	22°C	37°C 2002	13°C 2013	16%
May 4	32°C	22°C	42°C 1999	14°C 2013	16%
May 5	32°C	22°C	40°C 1999	16°C 2013	17%
May 6	32°C	22°C	38°C 1998	16°C 2013	18%
May 7	32°C	22°C	39°C 1998	17°C 1992	18%
May 8	32°C	23°C	39°C 1998	15°C 1992	21%
May 9	32°C	23°C	39°C 1998	19°C 1992	23%
May 10	32°C	23°C	38°C 1995	18°C 1993	24%
May 11	32°C	23°C	36°C 1999	18°C 1993	25%
May 12	32°C	23°C	36°C 1995	17°C 1993	25%
May 13	32°C	23°C	39°C 1995	19°C 2014	25%
May 14	32°C	23°C	38°C 1995	17°C 2014	26%
May 15	33°C	23°C	36°C 1998	15°C 2014	26%
May 16	33°C	23°C	35°C 2018	14°C 2014	26%
May 17	33°C	23°C	39°C 2003	18°C 2006	26%
May 18	33°C	23°C	37°C 2003	18°C 2008	26%
May 19	33°C	23°C	37°C 2003	18°C 2009	26%
May 20	33°C	24°C	37°C 2011	18°C 2002	26%
May 21	33°C	24°C	36°C 2019	19°C 2009	26%
May 22	33°C	24°C	37°C 2008	21°C 2012	26%
May 23	33°C	24°C	39°C 2008	21°C 2009	25%
May 24	33°C	24°C	37°C 2008	21°C 2017	24%
May 25	33°C	24°C	36°C 2009	22°C 1993	23%
May 26	33°C	24°C	37°C 2011	20°C 1993	23%
May 27	34°C	24°C	37°C 2018	21°C 1992	24%
May 28	34°C	24°C	38°C 1996	21°C 2010	24%
May 29	34°C	24°C	38°C 1998	19°C 1992	24%
May 30	34°C	25°C	37°C 2004	19°C 1992	24%
May 31	34°C	25°C	39°C 2005	22°C 1993	25%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (CDT).

May 1: sunrise 6:53 AM, sunset 8:02 PM
May 31: sunrise 6:39 AM, sunset 8:17 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.