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Climate - Guam


Average weather, temperature, rainfall, sunshine

Flag - Guam

Map - Guam

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Climate chart - Tamuning

In Guam, the climate is tropical, hot and humid all year round. Guam is an island administered by the United States and located in the western Pacific Ocean, about 2,000 kilometers (1,200 miles) east of the Philippines, between the Equator and the Tropic of Cancer (at 13 degrees north latitude); geographically, it is part of Micronesia.
Temperatures are very stable, and are around 30/31.5 °C (86/89 °F) during the day and 23.5/25 °C (74/77 °F) at night, all year round.
Given the enormous distance from the continents, temperatures vary little compared to the averages. At night, it never gets cold. On cooler nights, the temperature typically drops to 21/22 °C (70/72 °F) from December to March, although it can drop down to 18/19 °C (64/66 °F) from time to time. On the hottest days, the temperature reaches 33/34 °C (91/93 °F), and this usually happens in April and May.
Here are the average temperatures at the international airport, located near Tamuning.
Tamuning - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January243026.9758680.3
February243026.8758680.2
March243027.2758781.1
April253128778882.4
May253128.4788983.1
June253228.5788983.3
July253128778882.4
August253127.6768781.7
September243127.6768781.7
October253127.8768882
November253128778882.3
December253027.6768781.6
Year24.630.827.6576.387.481.5

The rainfall is abundant, above 2,000 millimeters (80 inches) per year; the rainiest period is from July to November, while the driest one is from February to May, when, however, showers often occur, although they usually do not last long. The humidity is high all year round, but especially in the wettest period: from July to November, the average is equal to or higher than 80%, while from February to May, it drops to about 75%.
Here is the average precipitation.
Tamuning - Average precipitation
MonthMillimetersInchesDays
January1355.320
February1003.918
March702.818
April903.518
May1104.318
June1556.121
July26510.423
August42016.525
September3801525
October31512.425
November2007.922
December1355.322
Year237093.3255

The amount of sunshine in Guam is not excellent, since it amounts to about 2,000 hours per year, though it is acceptable or good from February to June; from July to December, during the wettest period, it is quite scarce.
Here are the average sunshine hours per day.
Tamuning - Sunshine hours
MonthAverageTotal
January5.5175
February6175
March7215
April7215
May7220
June6.5195
July5155
August4.5140
September4.5135
October4.5135
November4.5135
December4.5145
Year5.62035

Guam

The sea in Guam is warm enough to swim in all year round, as can be seen in the following table.
Tamuning - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2882
February2882
March2882
April2883
May2984
June2985
July3085
August3085
September3085
October2985
November2984
December2883
Year28.883.9

Tropical cyclones



The island lies in the path of typhoons, the tropical cyclones of Southeast Asia and the Philippine Sea. Typhoons can cause more or less serious damage, bringing heavy rains and strong winds, and normally occur from May to December, though they are more frequent from August to November. Sometimes, however, they have affected the island outside of this period, as happened with typhoon Roy (in January 1988), Isa (in April 1997), and Kong-rey (not strong, in April 2007).

When to go and what to pack in Guam

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