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Monthly climate in San Jose, Alajuela, Costa Rica

Last updated: May 6, 2024

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, Alajuela, 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, Alajuela, Costa Rica.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 27°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 maximum 27°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 high 26°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 mean 24°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 low 22°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 minimum 21°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)
Minimum 20°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, Alajuela, Costa Rica with other places around the world.

Monthly average precipitation in San Jose, Alajuela, 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, Alajuela, Costa Rica.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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) 22 20 23 19 28 30 30 30 29 28 28 27

Monthly sunshine hours in San Jose, Alajuela, 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, Alajuela, Costa Rica.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 258 297 332 325 293 293 312 293 283 271 298 318
Mean daily daylight hours 11h 33m 11h 46m 12h 3m 12h 21m 12h 37m 12h 44m 12h 40m 12h 27m 12h 9m 11h 51m 11h 36m 11h 28m

Solar UV radiation in San Jose, Alajuela, 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, Alajuela, Costa Rica.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 11 13 14 14 14 14 14 13 13 13 11 10