Rivas Weather in May

NASA POWER reanalysis for the half-degree grid cell around Rivas, 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 30°C on May 31, and lows from 27°C to 27°C. Normal precipitation for the month is 161 mm over about 16 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: 27°C
Precipitation: 161 mm
Reanalysis high: 35°CMay 14, 1998
Reanalysis low: 25°CMay 26, 1996
Daylight: 12 h 33 min to 12 h 45 min
Cloud cover: 73%
Humidity: 72%
Dew point: 23°C
Wind: 19.8 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	27°C	34°C 1991	26°C 2000	23%
May 2	32°C	27°C	34°C 1997	26°C 1992	23%
May 3	32°C	27°C	34°C 1997	26°C 1992	25%
May 4	32°C	27°C	34°C 2002	26°C 1992	26%
May 5	32°C	27°C	34°C 1994	26°C 2009	28%
May 6	32°C	27°C	34°C 2002	26°C 1992	29%
May 7	32°C	27°C	34°C 2005	26°C 2013	29%
May 8	32°C	27°C	33°C 2008	26°C 2000	30%
May 9	32°C	27°C	34°C 2015	26°C 1997	32%
May 10	32°C	27°C	34°C 1994	26°C 2002	34%
May 11	32°C	27°C	34°C 2015	27°C 1992	36%
May 12	32°C	27°C	34°C 2020	26°C 1992	38%
May 13	32°C	27°C	34°C 1998	26°C 1992	40%
May 14	31°C	27°C	35°C 1998	26°C 2013	43%
May 15	31°C	27°C	35°C 1998	26°C 2013	45%
May 16	31°C	27°C	34°C 1998	26°C 2013	48%
May 17	31°C	27°C	34°C 1998	26°C 2013	50%
May 18	31°C	27°C	34°C 1992	26°C 1996	51%
May 19	31°C	27°C	33°C 1997	26°C 1996	52%
May 20	31°C	27°C	34°C 1997	26°C 1996	54%
May 21	30°C	27°C	33°C 1997	26°C 1996	56%
May 22	30°C	27°C	33°C 1997	26°C 2004	58%
May 23	30°C	27°C	33°C 1997	26°C 2004	60%
May 24	30°C	27°C	33°C 1997	25°C 2004	61%
May 25	30°C	27°C	33°C 1997	26°C 1996	62%
May 26	30°C	27°C	33°C 1997	25°C 1996	62%
May 27	30°C	27°C	33°C 1994	26°C 2002	62%
May 28	30°C	27°C	33°C 1991	26°C 2008	62%
May 29	30°C	27°C	34°C 1995	26°C 2001	62%
May 30	30°C	27°C	33°C 1995	26°C 2002	63%
May 31	30°C	27°C	32°C 2006	26°C 2007	62%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (CST).

May 1: sunrise 5:24 AM, sunset 5:57 PM
May 31: sunrise 5:19 AM, sunset 6:04 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.