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Monthly climate in San Alejo, El Salvador

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Alejo features a tropical savanna climate (Aw). Temperatures typically range between 27 °C (80 °F) and 30 °C (86 °F) through the year, but rarely can drop to 18 °C (64 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 1491 mm (58.7 inches) and receives 143 rainy days on the 1 mm (0.04 inches) threshold annually. San Alejo enjoys an average of 3682 hours of sunshine throughout the year, and daylight varies from 11 hours 19 minutes to 12 hours 54 minutes per day.

Monthly average temperatures in San Alejo, El Salvador

The warmest months in San Alejo are March, April and July, with daily mean temperatures ranging from 29 to 30 °C (84 - 86 °F) throughout the day. The coldest temperatures usually occur in October, November and December, when daily mean temperatures range from 27 to 27 °C (80 - 81 °F) throughout the day. On average each year, San Alejo 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 San Alejo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum37°C
(99°F)		40°C
(104°F)		39°C
(102°F)		39°C
(103°F)		39°C
(102°F)		38°C
(100°F)		39°C
(102°F)		39°C
(102°F)		38°C
(100°F)		34°C
(94°F)		35°C
(95°F)		36°C
(97°F)
Mean maximum36°C
(98°F)		38°C
(100°F)		38°C
(101°F)		39°C
(102°F)		37°C
(100°F)		35°C
(95°F)		37°C
(99°F)		37°C
(98°F)		35°C
(95°F)		34°C
(93°F)		34°C
(93°F)		35°C
(96°F)
Average high34°C
(94°F)		35°C
(96°F)		36°C
(98°F)		36°C
(97°F)		34°C
(93°F)		33°C
(91°F)		35°C
(95°F)		34°C
(93°F)		33°C
(91°F)		31°C
(89°F)		32°C
(90°F)		34°C
(93°F)
Daily mean28°C
(82°F)		29°C
(84°F)		30°C
(86°F)		30°C
(86°F)		29°C
(84°F)		28°C
(82°F)		29°C
(84°F)		28°C
(83°F)		27°C
(82°F)		27°C
(80°F)		27°C
(80°F)		27°C
(81°F)
Average low22°C
(72°F)		22°C
(73°F)		24°C
(75°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		22°C
(72°F)		21°C
(71°F)
Mean minimum19°C
(67°F)		20°C
(69°F)		21°C
(70°F)		23°C
(73°F)		23°C
(73°F)		22°C
(73°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(71°F)		20°C
(69°F)		19°C
(66°F)
Minimum18°C
(64°F)		19°C
(66°F)		20°C
(69°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(71°F)		22°C
(71°F)		21°C
(69°F)		19°C
(66°F)		18°C
(65°F)

Compare climate in San Alejo with other places

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

Monthly average precipitation in San Alejo, El Salvador

San Alejo usually has the most precipitation in June, September and October, with an average of 24 rainy days and 285 mm (11.2 inches) of precipitation per month. The driest months in San Alejo 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 San Alejo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)1 (0.0)1 (0.0)6 (0.2)29 (1.1)241 (9.5)274 (10.8)80 (3.1)222 (8.7)248 (9.8)331 (13.0)55 (2.2)3 (0.1)
Average precipitation days (≥ 1 mm)000724221221252570

Monthly sunshine hours in San Alejo, El Salvador

The sunniest months in San Alejo are March, July and December, when the sun shines an average of 10 hours 36 minutes a day. Least sunny months in San Alejo: January, June and October receive an average of 9 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Alejo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours262293329319315291331317301289305325
Mean daily daylight hours11h 24m11h 41m12h 3m12h 25m12h 44m12h 54m12h 49m12h 32m12h 10m11h 48m11h 28m11h 19m

Solar UV radiation in San Alejo, El Salvador

San Alejo 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 / Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. For more detailed information, check out our hourly San Alejo UV Index data.

Average daily maximum UV levels by month for San Alejo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)11121414141413131313109