Climate in Guam

The climate across Guam shows moderate regional variation. Annual temperatures range from lows of 8°C in the coldest regions to highs of 23°C in the warmest areas. Annual precipitation ranges from 81mm in drier regions to 313mm in wetter parts of the country. Conditions across Guam are broadly warm, with only modest differences between regions.

Temperature patterns across Guam vary by region, with distinct differences between areas. The Central is the warmest part of the country, with peak temperatures reaching 23°C and an annual average of 20°C. Cooler conditions are found in the Central, where winter lows drop to 8°C and an annual average of 17°C. Despite some regional variation, the 4°C difference in annual averages means conditions are broadly similar across Guam. Regional temperature differences remain relatively consistent across seasons, with around 2°C of variation in both summer and winter. For example, Yigo Village in the Yigo Municipality averages 20°C annually, while Talofofo Village in the Talofofo Municipality averages 17°C.

Guam sees notable variation in rainfall across its regions, ranging from 81mm to 313mm per year. The Central receives the most rainfall, at approximately 313mm annually. The Central is the driest, with around 81mm per year. Winter tends to be the wetter season across most of Guam, though precipitation occurs throughout the year. Visitors heading to wetter areas can expect more frequent rain than those staying in drier parts of the country.