Climate & Weather Guide · GuamClimate & Weather Guide in Guam
Climate zones, seasonal temperatures, rainfall patterns, and best travel times
Guam features a uniform tropical rainforest climate (Köppen Af), characterized by year-round high temperatures, high humidity, and distinct wet and dry seasons. Average highs reach 30°C and lows 24°C, with minimal variation throughout the year. The dry season spans January to June, while the wet season from July to December brings heavy rainfall, averaging 2490 mm annually. Trade winds provide some relief from the persistent humidity, which averages around 66-84%. Sunshine is abundant, though frequent showers and typhoon risks occur during the wet season. This equable climate appeals to expats seeking tropical warmth but requires adaptation to humidity and storms.
Summer Average
24-31°C
Winter Average
24-30°C
Climate Types
Tropical rainforest
2130-2950 mm
2,500-2,800 hours annually
66-84%
Regional Climate Variations
Island-wide (Central Region)
Guam's small size results in a homogeneous tropical rainforest climate across the island. Temperatures remain consistently warm, with daily highs of 30°C and lows of 24°C year-round. The dry season (January-June) features lower rainfall and steady trade winds, ideal for outdoor activities. The wet season (July-December) delivers very high rainfall, often from typhoons, creating lush vegetation but potential flooding risks. Humidity stays elevated, especially at night. Residents appreciate the predictable warmth but must prepare for sudden downpours and storm seasons.
Warm, humid paradise with constant trade winds moderating the heat; lush and green but prone to intense wet-season downpours and typhoons
Northern Highlands
The northern region, with slightly elevated terrain, mirrors the island's tropical rainforest climate but experiences marginally higher rainfall due to orographic effects. Temperatures average 29-30°C highs and 24°C lows consistently. Dry season offers clearer skies, while wet season intensifies precipitation, enhancing the dense jungle cover. Trade winds provide ventilation, though humidity remains high. This area suits nature enthusiasts, offering cooler breezes at higher elevations amid vibrant biodiversity, but demands storm preparedness.
Lush, misty highlands with enhanced rainfall; slightly fresher feel from elevation but still steamy and typhoon-exposed
Southern Coast
Coastal southern Guam maintains the tropical rainforest profile, with ocean breezes tempering the heat. Highs of 30°C and lows of 24°C prevail year-round. Dry season brings calmer weather for beach life, while wet season ramps up showers and humidity. Slightly lower rainfall than northern areas due to less elevation, but still very high annually. Expats enjoy water sports and sun, though high humidity and occasional rough seas from typhoons require vigilance.
Breezy coastal warmth with salty air; vibrant marine climate softened by sea winds amid heavy tropical rains
Guam's uniform tropical rainforest climate offers consistent warmth (24-31°C) and very high rainfall, with wet and dry seasons shaping daily life. Expats enjoy year-round beach weather and trade wind relief but must adapt to high humidity, typhoons, and flooding risks. Ideal for those seeking a stable tropical lifestyle with natural beauty.
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