Guam Climatic Classifications

Summary: Most regions (19) in Guam lie in the Tropical rainforest climate zone (Köppen: Af). The mean average of annual temperatures range from a high of 28.33°C (82.99°F) in Yigo to a low of 28.33°C (82.99°F) in Agana Heights.

Climate Guam: Weather By Month

Month Jan Feb Mar Apr May Jun Jul Aug Sep Nov Oct Dec Year
Record high °C (°F) 27.77(81.99) 27.44(81.39) 27.7(81.86) 28.29(82.92) 28.91(84.04) 29.28(84.7) 29.34(84.81) 29.26(84.67) 29.28(84.7) 29.05(84.29) 28.97(84.15) 28.55(83.39) 29.34(84.81)
Average high °C (°F) 27.77(81.99) 27.44(81.39) 27.7(81.86) 28.29(82.92) 28.91(84.04) 29.28(84.7) 29.34(84.81) 29.26(84.67) 29.28(84.7) 29.05(84.29) 28.97(84.15) 28.55(83.39) 28.65(83.57)
Daily mean °C (°F) 27.55(81.59) 27.16(80.89) 27.39(81.3) 27.85(82.13) 28.58(83.44) 28.98(84.16) 28.96(84.13) 28.9(84.02) 28.92(84.06) 28.69(83.64) 28.75(83.75) 28.21(82.78) 28.33(82.99)
Average low °C (°F) 26.97(80.55) 26.5(79.7) 26.69(80.04) 27.32(81.18) 27.94(82.29) 28.31(82.96) 28.33(82.99) 28.12(82.62) 28.17(82.71) 27.99(82.38) 28.01(82.42) 27.62(81.72) 27.66(81.79)
Record low °C (°F) 26.97(80.55) 26.5(79.7) 26.69(80.04) 27.32(81.18) 27.94(82.29) 28.31(82.96) 28.33(82.99) 28.12(82.62) 28.17(82.71) 27.99(82.38) 28.01(82.42) 27.62(81.72) 26.5(79.7)
Average precipitation mm (inches) 70.8(2.79) 56.06(2.21) 45.32(1.78) 63.78(2.51) 90.81(3.58) 98.07(3.86) 191.0(7.52) 244.75(9.64) 263.27(10.36) 213.35(8.4) 127.59(5.02) 70.0(2.76) 127.9(5.04)
Average precipitation days (≥ 1.0 mm) 14.45 9.73 10.91 12.09 15.64 20.0 26.55 25.91 25.82 24.91 17.64 14.45 18.17
Average relative humidity (%) 77.84 77.17 77.88 78.21 77.64 76.96 76.58 76.16 76.28 77.3 78.17 77.85 77.34
Mean monthly sunshine hours 10.02 10.33 10.48 10.79 12.29 12.41 10.9 10.09 10.07 9.28 7.84 8.71 10.27

Guam Climate Graph

Guam’s Cities by Temperature

Guam’s states/regions ranking by average yearly temperature:

Yigo
28.33°C | 82.99°F
Yona
28.33°C | 82.99°F
Mongmong-Toto-Maite
28.33°C | 82.99°F
Mangilao
28.33°C | 82.99°F
Santa Rita
28.33°C | 82.99°F
Talofofo
28.33°C | 82.99°F
Umatac
28.33°C | 82.99°F
Chalan Pago-Ordot
28.33°C | 82.99°F
Agat
28.33°C | 82.99°F
Dededo
28.33°C | 82.99°F
Barrigada
28.33°C | 82.99°F
Inarajan
28.33°C | 82.99°F
Piti
28.33°C | 82.99°F
Merizo
28.33°C | 82.99°F
Hagåtña
28.33°C | 82.99°F
Sinajana
28.33°C | 82.99°F
Tamuning
28.33°C | 82.99°F
Asan
28.33°C | 82.99°F
Agana Heights
28.33°C | 82.99°F

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