Costa Rica Climatic Classifications

Code Description Group Number of states/regions States/regions
Am Tropical monsoon Tropical 3 Alajuela Heredia San José
Aw Tropical wet and dry or savanna Tropical 2 Guanacaste Puntarenas
Af Tropical rainforest Tropical 1 Limón
Cfb Marine west coast, warm summer Temperate 1 Cartago

Summary: Most regions (3) in Costa Rica lie in the Tropical monsoon climate zone (Köppen: Am). The mean average of annual temperatures range from a high of 27.88°C (82.18°F) in Guanacaste to a low of 20.08°C (68.14°F) in Cartago.

Climate Costa Rica: Weather By Month

Month Jan Feb Mar Apr May Jun Jul Aug Sep Nov Oct Dec Year
Record high °C (°F) 30.84(87.51) 32.61(90.7) 33.94(93.09) 34.98(94.96) 33.01(91.42) 30.82(87.48) 30.43(86.77) 30.83(87.49) 30.19(86.34) 29.76(85.57) 29.26(84.67) 29.6(85.28) 34.98(94.96)
Average high °C (°F) 26.71(80.08) 27.89(82.2) 28.62(83.52) 28.87(83.97) 27.38(81.28) 26.39(79.5) 26.21(79.18) 26.49(79.68) 26.13(79.03) 25.43(77.77) 25.55(77.99) 25.83(78.49) 26.79(80.22)
Daily mean °C (°F) 22.83(73.09) 23.7(74.66) 24.39(75.9) 25.06(77.11) 24.53(76.15) 23.83(74.89) 23.44(74.19) 23.62(74.52) 23.48(74.26) 22.95(73.31) 22.61(72.7) 22.41(72.34) 23.57(74.43)
Average low °C (°F) 17.54(63.57) 17.83(64.09) 18.37(65.07) 19.7(67.46) 20.56(69.01) 20.22(68.4) 19.46(67.03) 19.52(67.14) 19.77(67.59) 19.39(66.9) 18.67(65.61) 17.83(64.09) 19.07(66.33)
Record low °C (°F) 13.56(56.41) 13.75(56.75) 14.32(57.78) 15.7(60.26) 16.78(62.2) 16.71(62.08) 15.74(60.33) 15.81(60.46) 16.21(61.18) 15.87(60.57) 14.84(58.71) 13.94(57.09) 13.56(56.41)
Average precipitation mm (inches) 38.41(1.51) 28.27(1.11) 30.13(1.19) 76.52(3.01) 271.66(10.7) 299.53(11.79) 248.55(9.79) 284.18(11.19) 303.56(11.95) 332.04(13.07) 171.85(6.77) 80.34(3.16) 180.42(7.1)
Average precipitation days (≥ 1.0 mm) 5.77 5.9 6.44 13.21 23.22 24.66 24.01 23.65 25.96 26.0 20.71 11.08 17.55
Average relative humidity (%) 74.05 70.79 70.27 72.81 79.78 84.42 83.49 83.37 85.1 86.15 84.26 79.27 79.48
Mean monthly sunshine hours 10.32 10.78 10.91 10.95 10.31 10.66 11.38 10.4 10.04 9.78 10.14 10.55 10.52

Costa Rica Climate Graph

Costa Rica’s Cities by Temperature

Costa Rica’s states/regions ranking by average yearly temperature:

Guanacaste
27.88°C | 82.18°F
Puntarenas
27.35°C | 81.23°F
Limón
27.13°C | 80.83°F
Alajuela
21.91°C | 71.44°F
San José
20.33°C | 68.59°F
Heredia
20.33°C | 68.59°F
Cartago
20.08°C | 68.14°F

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