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Monthly climate in San Jose, Costa Rica

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Jose features a tropical savanna climate (Aw). Temperatures typically range between 24 °C (75 °F) and 26 °C (78 °F) through the year, but rarely can drop to 20 °C (68 °F) or can rise to as high as 30 °C (87 °F). The average annual precipitation amounts to about 2788 mm (109.8 inches) and receives 314 rainy days on the 1 mm (0.04 inches) threshold annually. San Jose enjoys an average of 3577 hours of sunshine throughout the year, and daylight varies from 11 hours 28 minutes to 12 hours 44 minutes per day.

Monthly average temperatures in San Jose, Costa Rica

The warmest months in San Jose are April, May and June, with daily mean temperatures ranging from 25 to 26 °C (78 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 24 to 24 °C (75 - 76 °F) throughout the day. On average each year, San Jose experiences 316 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 Jose. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(82°F)		28°C
(83°F)		28°C
(83°F)		30°C
(87°F)		30°C
(85°F)		29°C
(85°F)		28°C
(84°F)		29°C
(85°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		28°C
(82°F)
Mean maximum27°C
(80°F)		28°C
(82°F)		28°C
(83°F)		29°C
(85°F)		29°C
(85°F)		29°C
(84°F)		28°C
(83°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		27°C
(82°F)		27°C
(81°F)
Average high26°C
(78°F)		26°C
(80°F)		27°C
(81°F)		28°C
(83°F)		28°C
(82°F)		27°C
(82°F)		27°C
(81°F)		27°C
(81°F)		27°C
(82°F)		27°C
(81°F)		26°C
(80°F)		26°C
(79°F)
Daily mean24°C
(75°F)		24°C
(76°F)		24°C
(76°F)		26°C
(78°F)		26°C
(78°F)		25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)
Average low22°C
(72°F)		22°C
(72°F)		22°C
(73°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		23°C
(75°F)		24°C
(75°F)		24°C
(75°F)		23°C
(75°F)		23°C
(74°F)		22°C
(73°F)
Mean minimum21°C
(70°F)		21°C
(70°F)		21°C
(71°F)		22°C
(72°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		23°C
(74°F)		23°C
(73°F)		22°C
(72°F)		21°C
(70°F)
Minimum20°C
(68°F)		20°C
(68°F)		21°C
(69°F)		22°C
(71°F)		22°C
(73°F)		23°C
(73°F)		22°C
(73°F)		22°C
(72°F)		22°C
(73°F)		22°C
(72°F)		22°C
(72°F)		20°C
(69°F)

Compare climate in San Jose with other places

Compare temperature, precipitation, sunshine, UV index in San Jose, Costa Rica with other places around the world.

Monthly average precipitation in San Jose, Costa Rica

San Jose usually has the most precipitation in June, October and November, with an average of 28 rainy days and 343 mm (13.5 inches) of precipitation per month. The driest months in San Jose are February, March and April. On average, 91 mm (3.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Jose. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)148 (5.8)96 (3.8)102 (4.0)75 (2.9)297 (11.7)337 (13.3)270 (10.6)286 (11.2)272 (10.7)387 (15.2)306 (12.0)212 (8.3)
Average precipitation days (≥ 1 mm)222023192830303029282827

Monthly sunshine hours in San Jose, Costa Rica

The sunniest months in San Jose are March, April and December, when the sun shines an average of 10 hours 36 minutes a day. Least sunny months in San Jose: January, September and October receive an average of 8 hours 50 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Jose. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours258297332325293293312293283271298318
Mean daily daylight hours11h 33m11h 46m12h 3m12h 21m12h 37m12h 44m12h 40m12h 27m12h 9m11h 51m11h 36m11h 28m

Solar UV radiation in San Jose, Costa Rica

San Jose 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 Jose UV Index data.

Average daily maximum UV levels by month for San Jose. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)111314141414141313131110