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Monthly climate in Arenal, Colombia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Arenal features a tropical monsoon climate (Am). Temperatures typically range between 27 °C (81 °F) and 30 °C (86 °F) through the year, but rarely can drop to 22 °C (71 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 1657 mm (65.3 inches) and receives 222 rainy days on the 1 mm (0.04 inches) threshold annually. Arenal enjoys an average of 3339 hours of sunshine throughout the year, and daylight varies from 11 hours 37 minutes to 12 hours 35 minutes per day.

Monthly average temperatures in Arenal, Colombia

The warmest months in Arenal are January, February and March, with daily mean temperatures ranging from 28 to 30 °C (84 - 86 °F) throughout the day. The coldest temperatures usually occur in September, October and November, when daily mean temperatures range from 27 to 27 °C (81 - 82 °F) throughout the day. On average each year, Arenal 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 Arenal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum38°C
(100°F)		39°C
(102°F)		39°C
(103°F)		37°C
(99°F)		37°C
(99°F)		36°C
(97°F)		37°C
(99°F)		37°C
(99°F)		36°C
(97°F)		37°C
(99°F)		35°C
(95°F)		35°C
(95°F)
Mean maximum37°C
(98°F)		38°C
(100°F)		38°C
(100°F)		36°C
(96°F)		35°C
(95°F)		34°C
(94°F)		36°C
(97°F)		36°C
(97°F)		35°C
(95°F)		34°C
(93°F)		33°C
(92°F)		34°C
(94°F)
Average high34°C
(93°F)		36°C
(97°F)		35°C
(95°F)		33°C
(91°F)		31°C
(89°F)		32°C
(89°F)		33°C
(91°F)		33°C
(91°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		32°C
(91°F)
Daily mean28°C
(84°F)		30°C
(86°F)		30°C
(86°F)		28°C
(83°F)		28°C
(82°F)		28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		27°C
(82°F)		27°C
(81°F)		27°C
(81°F)		28°C
(82°F)
Average low24°C
(76°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		25°C
(76°F)		25°C
(77°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		24°C
(76°F)
Mean minimum22°C
(72°F)		23°C
(74°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		22°C
(72°F)		23°C
(73°F)		23°C
(73°F)
Minimum22°C
(71°F)		22°C
(72°F)		22°C
(73°F)		23°C
(73°F)		23°C
(73°F)		22°C
(72°F)		22°C
(73°F)		22°C
(73°F)		22°C
(73°F)		22°C
(71°F)		22°C
(72°F)		22°C
(72°F)

Compare climate in Arenal with other places

Compare temperature, precipitation, sunshine, UV index in Arenal, Colombia with other places around the world.

Monthly average precipitation in Arenal, Colombia

Arenal usually has the most precipitation in May, September and October, with an average of 26 rainy days and 223 mm (8.8 inches) of precipitation per month. The driest months in Arenal are January, February and December. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Arenal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)22 (0.9)5 (0.2)54 (2.1)171 (6.7)272 (10.7)192 (7.6)136 (5.3)187 (7.4)193 (7.6)205 (8.1)181 (7.1)39 (1.5)
Average precipitation days (≥ 1 mm)418212625242525282411

Monthly sunshine hours in Arenal, Colombia

The sunniest months in Arenal are February, March and December, when the sun shines an average of 10 hours 16 minutes a day. Least sunny months in Arenal: April, May and June receive an average of 8 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Arenal. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours264306310263233259291291268263269317
Mean daily daylight hours11h 40m11h 50m12h 4m12h 18m12h 29m12h 35m12h 32m12h 22m12h 8m11h 54m11h 43m11h 37m

Solar UV radiation in Arenal, Colombia

Arenal experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 14 - 15, 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 12. For more detailed information, check out our hourly Arenal UV Index data.

Average daily maximum UV levels by month for Arenal. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)121314151413131313131210