Zacatecoluca Weather in May

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

Average highs run from 34°C on May 1 to 30°C on May 31, and lows from 26°C to 25°C. Normal precipitation for the month is 146 mm over about 19 wet days.

May day by day

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

Normal low
Normal high
Record high
Record low

May at a glance

Average high: 32°C
Average low: 25°C
Precipitation: 146 mm
Record high: 37°CMay 17, 2003
Record low: 12°CMay 8, 1985
Daylight: 12 h 37 min to 12 h 52 min
Cloud cover: 69%
Humidity: 72%
Dew point: 22°C
Wind: 9.0 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	Record high	Record low	Chance wet
May 1	34°C	26°C	35°C 2003	15°C 1973	37%
May 2	34°C	26°C	34°C 2002	16°C 1987	39%
May 3	34°C	26°C	33°C 1961	17°C 1962	41%
May 4	34°C	26°C	35°C 1997	18°C 2000	42%
May 5	34°C	26°C	36°C 2002	17°C 1962	44%
May 6	33°C	26°C	36°C 1997	18°C 1964	46%
May 7	33°C	26°C	36°C 2002	17°C 1962	48%
May 8	33°C	26°C	36°C 1979	12°C 1985	50%
May 9	33°C	26°C	35°C 2003	15°C 1959	51%
May 10	33°C	25°C	33°C 2001	16°C 1963	53%
May 11	33°C	25°C	34°C 2010	17°C 1959	54%
May 12	33°C	25°C	35°C 1987	18°C 2006	54%
May 13	33°C	25°C	36°C 1958	18°C 2006	56%
May 14	33°C	25°C	36°C 2002	17°C 1962	58%
May 15	33°C	25°C	35°C 1958	18°C 1959	60%
May 16	33°C	25°C	35°C 1964	18°C 1958	62%
May 17	32°C	25°C	37°C 2003	16°C 1995	63%
May 18	32°C	25°C	35°C 1987	16°C 1995	64%
May 19	32°C	25°C	35°C 1987	18°C 1959	66%
May 20	32°C	25°C	34°C 1961	16°C 2005	67%
May 21	32°C	25°C	33°C 2014	18°C 1962	69%
May 22	32°C	25°C	33°C 2023	18°C 1962	70%
May 23	31°C	25°C	33°C 2023	19°C 1985	71%
May 24	31°C	25°C	33°C 2021	19°C 1957	73%
May 25	31°C	25°C	34°C 1964	18°C 1959	72%
May 26	31°C	25°C	33°C 1958	17°C 1957	72%
May 27	31°C	25°C	32°C 2024	17°C 1957	73%
May 28	31°C	25°C	33°C 2009	18°C 1957	74%
May 29	31°C	25°C	33°C 1999	18°C 1957	73%
May 30	30°C	25°C	33°C 1999	17°C 1959	74%
May 31	30°C	25°C	34°C 1962	17°C 1965	74%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (CST).

May 1: sunrise 5:34 AM, sunset 6:11 PM
May 31: sunrise 5:27 AM, sunset 6:19 PM

Every day of May: sun and moon

Other months

Sources

Records: NOAA GHCN-Daily, station ES003800510, every year on file, quality-flagged values removed. 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.