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Monthly climate in San Isidro, San José, Costa Rica

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification San Isidro features a tropical rainforest climate (Af).Temperatures typically range between 22 °C (72 °F) and 23 °C (73 °F) through the year, but rarely can drop to 17 °C (64 °F) or can rise to as high as 27 °C (80 °F).The average annual precipitation amounts to about 6731 mm (265.0 inches) and receives 342 rainy days on the 1 mm (0.04 inches) threshold annually.San Isidro enjoys an average of 3144 hours of sunshine throughout the year, and daylight varies from 11 hours 34 minutes to 12 hours 38 minutes per day.

Monthly average temperatures in San Isidro, San José, Costa Rica §

The warmest months in San Isidro are April, May and June, with daily mean temperatures ranging from 23 to 23 °C (73 - 73 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 22 to 22 °C (72 - 72 °F) throughout the day. On average each year, San Isidro experiences 31 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 Isidro, San José, 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 25°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 26°C
(79°F)		 27°C
(80°F)		 26°C
(79°F)		 25°C
(78°F)		 26°C
(78°F)		 26°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)
Mean maximum 25°C
(77°F)		 25°C
(77°F)		 25°C
(78°F)		 25°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 25°C
(77°F)		 25°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 24°C
(76°F)		 25°C
(76°F)
Average high 24°C
(75°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(75°F)		 24°C
(75°F)		 24°C
(75°F)
Daily mean 22°C
(72°F)		 22°C
(73°F)		 23°C
(73°F)		 23°C
(73°F)		 23°C
(73°F)		 23°C
(73°F)		 22°C
(73°F)		 22°C
(73°F)		 22°C
(72°F)		 22°C
(72°F)		 22°C
(72°F)		 22°C
(72°F)
Average low 20°C
(68°F)		 20°C
(69°F)		 21°C
(69°F)		 21°C
(70°F)		 21°C
(71°F)		 21°C
(70°F)		 21°C
(70°F)		 21°C
(70°F)		 21°C
(70°F)		 21°C
(69°F)		 20°C
(69°F)		 20°C
(68°F)
Mean minimum 19°C
(66°F)		 19°C
(66°F)		 19°C
(67°F)		 20°C
(68°F)		 21°C
(69°F)		 20°C
(69°F)		 20°C
(69°F)		 20°C
(68°F)		 20°C
(68°F)		 20°C
(67°F)		 19°C
(67°F)		 19°C
(66°F)
Minimum 18°C
(65°F)		 17°C
(64°F)		 19°C
(66°F)		 19°C
(67°F)		 20°C
(68°F)		 20°C
(68°F)		 20°C
(67°F)		 19°C
(67°F)		 20°C
(68°F)		 19°C
(67°F)		 19°C
(67°F)		 18°C
(65°F)

Compare climate in San Isidro with other places

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

Monthly average precipitation in San Isidro, San José, Costa Rica §

San Isidro usually has the most precipitation in August, October and November, with an average of 30 rainy days and 886 mm (34.9 inches) of precipitation per month.The driest months in San Isidro are January, February and March. On average, 138 mm (5.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Isidro, San José, 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) 194 (7.6) 99 (3.9) 120 (4.7) 350 (13.8) 742 (29.2) 663 (26.1) 784 (30.8) 838 (33.0) 766 (30.1) 937 (36.9) 885 (34.8) 354 (13.9)
Average precipitation days (≥ 1 mm) 21 23 26 30 31 30 31 31 30 30 30 29

Monthly sunshine hours in San Isidro, San José, Costa Rica §

The sunniest months in San Isidro are February, March and December, when the sun shines an average of 10 hours 18 minutes a day.Least sunny months in San Isidro: May, September and October receive an average of 7 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Isidro, San José, 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 253 298 333 293 230 241 249 240 231 220 247 305
Mean daily daylight hours 11h 37m 11h 49m 12h 3m 12h 19m 12h 32m 12h 38m 12h 35m 12h 23m 12h 9m 11h 53m 11h 40m 11h 34m

Solar UV radiation in San Isidro, San José, Costa Rica §

San Isidro experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 15 - 15, which corresponds to the Extreme category of sun exposure.January, November and December are in the 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 San Isidro UV Index data.

Average daily maximum UV levels by month for San Isidro, San José, 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) 12 14 15 15 15 14 14 14 14 14 12 11