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Monthly climate in Retalhuleu, Guatemala

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Retalhuleu features a tropical savanna climate (Aw). Temperatures typically range between 26 °C (79 °F) and 28 °C (83 °F) through the year, but rarely can drop to 18 °C (65 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 2592 mm (102.1 inches) and receives 229 rainy days on the 1 mm (0.04 inches) threshold annually. Retalhuleu enjoys an average of 3559 hours of sunshine throughout the year, and daylight varies from 11 hours 15 minutes to 12 hours 57 minutes per day.

Monthly average temperatures in Retalhuleu, Guatemala

The warmest months in Retalhuleu are March, April and May, with daily mean temperatures ranging from 27 to 28 °C (81 - 83 °F) throughout the day. The coldest temperatures usually occur in January, September and October, when daily mean temperatures range from 26 to 26 °C (79 - 80 °F) throughout the day. On average each year, Retalhuleu experiences 329 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Retalhuleu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(93°F)		36°C
(97°F)		36°C
(96°F)		37°C
(99°F)		37°C
(98°F)		34°C
(93°F)		34°C
(93°F)		33°C
(92°F)		34°C
(93°F)		33°C
(92°F)		34°C
(93°F)		34°C
(94°F)
Mean maximum33°C
(92°F)		35°C
(94°F)		35°C
(95°F)		36°C
(96°F)		35°C
(95°F)		32°C
(90°F)		33°C
(92°F)		33°C
(92°F)		33°C
(92°F)		32°C
(91°F)		33°C
(91°F)		34°C
(93°F)
Average high32°C
(89°F)		33°C
(91°F)		33°C
(92°F)		34°C
(93°F)		32°C
(90°F)		31°C
(88°F)		32°C
(89°F)		31°C
(89°F)		31°C
(88°F)		30°C
(87°F)		31°C
(88°F)		32°C
(89°F)
Daily mean26°C
(79°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		27°C
(81°F)		27°C
(80°F)		27°C
(81°F)		27°C
(80°F)		26°C
(80°F)		26°C
(79°F)		27°C
(80°F)		26°C
(80°F)
Average low22°C
(71°F)		22°C
(72°F)		23°C
(73°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		23°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		22°C
(72°F)
Mean minimum20°C
(68°F)		20°C
(68°F)		21°C
(70°F)		22°C
(71°F)		22°C
(73°F)		22°C
(73°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		21°C
(70°F)		20°C
(68°F)
Minimum18°C
(65°F)		19°C
(66°F)		20°C
(68°F)		21°C
(70°F)		22°C
(72°F)		22°C
(72°F)		21°C
(71°F)		22°C
(72°F)		21°C
(71°F)		22°C
(71°F)		21°C
(69°F)		19°C
(67°F)

Compare climate in Retalhuleu with other places

Compare temperature, precipitation, sunshine, UV index in Retalhuleu, Guatemala with other places around the world.

Monthly average precipitation in Retalhuleu, Guatemala

Retalhuleu usually has the most precipitation in May, September and October, with an average of 29 rainy days and 414 mm (16.3 inches) of precipitation per month. The driest months in Retalhuleu are January, February and December. On average, 23 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Retalhuleu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)24 (1.0)18 (0.7)44 (1.7)105 (4.1)447 (17.6)373 (14.7)292 (11.5)362 (14.3)418 (16.5)378 (14.9)106 (4.2)26 (1.0)
Average precipitation days (≥ 1 mm)631017312926292929146

Monthly sunshine hours in Retalhuleu, Guatemala

The sunniest months in Retalhuleu are March, April and December, when the sun shines an average of 10 hours 22 minutes a day. Least sunny months in Retalhuleu: January, June and October receive an average of 8 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Retalhuleu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours256286322314309280311298280277302317
Mean daily daylight hours11h 21m11h 39m12h 3m12h 27m12h 47m12h 57m12h 52m12h 34m12h 10m11h 46m11h 26m11h 15m

Solar UV radiation in Retalhuleu, Guatemala

Retalhuleu experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 10. For more detailed information, check out our hourly Retalhuleu UV Index data.

Average daily maximum UV levels by month for Retalhuleu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1011131413131312131299