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Monthly climate in La Union, El Salvador

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification La Union features a tropical savanna climate (Aw). Temperatures typically range between 27 °C (81 °F) and 29 °C (85 °F) through the year, but rarely can drop to 23 °C (73 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1798 mm (70.8 inches) and receives 141 rainy days on the 1 mm (0.04 inches) threshold annually. La Union enjoys an average of 3713 hours of sunshine throughout the year, and daylight varies from 11 hours 20 minutes to 12 hours 53 minutes per day.

Monthly average temperatures in La Union, El Salvador

The warmest months in La Union are April, July and August, with daily mean temperatures ranging from 28 to 29 °C (83 - 85 °F) throughout the day. The coldest temperatures usually occur in January, September and October, when daily mean temperatures range from 27 to 28 °C (81 - 82 °F) throughout the day. On average each year, La Union 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 La Union. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum32°C
(89°F)		32°C
(91°F)		33°C
(91°F)		33°C
(92°F)		32°C
(90°F)		33°C
(92°F)		33°C
(92°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		32°C
(89°F)		32°C
(89°F)
Mean maximum31°C
(88°F)		32°C
(89°F)		32°C
(90°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		32°C
(90°F)		32°C
(89°F)		30°C
(87°F)		30°C
(87°F)		31°C
(88°F)		31°C
(88°F)
Average high29°C
(85°F)		29°C
(85°F)		30°C
(86°F)		29°C
(85°F)		29°C
(85°F)		30°C
(86°F)		31°C
(87°F)		30°C
(86°F)		29°C
(84°F)		29°C
(84°F)		29°C
(85°F)		29°C
(85°F)
Daily mean28°C
(82°F)		28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		28°C
(83°F)		28°C
(83°F)		29°C
(85°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)		28°C
(83°F)		28°C
(82°F)
Average low26°C
(79°F)		26°C
(80°F)		27°C
(81°F)		27°C
(81°F)		27°C
(80°F)		27°C
(80°F)		28°C
(82°F)		27°C
(81°F)		26°C
(79°F)		26°C
(79°F)		27°C
(80°F)		26°C
(79°F)
Mean minimum24°C
(76°F)		25°C
(77°F)		26°C
(79°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		25°C
(78°F)		25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		25°C
(77°F)		24°C
(76°F)
Minimum23°C
(73°F)		23°C
(73°F)		25°C
(78°F)		24°C
(76°F)		25°C
(77°F)		24°C
(76°F)		25°C
(77°F)		24°C
(76°F)		25°C
(76°F)		23°C
(74°F)		25°C
(76°F)		24°C
(75°F)

Compare climate in La Union with other places

Compare temperature, precipitation, sunshine, UV index in La Union, El Salvador with other places around the world.

Monthly average precipitation in La Union, El Salvador

La Union usually has the most precipitation in June, September and October, with an average of 24 rainy days and 360 mm (14.2 inches) of precipitation per month. The driest months in La Union are January, February and December. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in La Union. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)2 (0.1)3 (0.1)4 (0.2)37 (1.5)275 (10.8)335 (13.2)76 (3.0)259 (10.2)314 (12.3)431 (17.0)59 (2.3)3 (0.1)
Average precipitation days (≥ 1 mm)001923221018252580

Monthly sunshine hours in La Union, El Salvador

The sunniest months in La Union are March, July and December, when the sun shines an average of 10 hours 39 minutes a day. Least sunny months in La Union: January, February and October receive an average of 9 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in La Union. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours264295330322317297333321303292306327
Mean daily daylight hours11h 25m11h 41m12h 3m12h 25m12h 44m12h 53m12h 48m12h 31m12h 10m11h 48m11h 29m11h 20m

Solar UV radiation in La Union, El Salvador

La Union experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 14 - 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 La Union UV Index data.

Average daily maximum UV levels by month for La Union. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)10121414141413131313109