Guam weather

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The weather guide for Guam shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

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When is it hottest in Guam?

The hottest time of year in Agana, Guam is normally September. Expect maximum daytime temperatures to reach 31°C with very high heat and humidity.

What is the wettest month in Guam?

In terms of rainfall, August usually gets the most rainfall in Agana, Guam with 363mm on average. In August there are normally 20 days with some rain.

When is it sunniest in Guam?

The sunniest time of year in Agana, Guam is normally March with bright sunshine on average for 58% of daylight hours; that's 7 hours of sunshine per day.

When is the sea warmest in Guam?

The sea is usually at its warmest in Agana, Guam in August when the water temperature reaches 29°C.

Metric (°C / mm)  |  Imperial (°F / inches)

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Compare Guam weather with the USA

Below the Guam weather chart shows average maximum daytime temperature for Guam (Agana) and the USA (Washington).

Maximum daytime temperature (°C)

Guam (Agana)
USA (Washington)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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Tropical storm risk: Guam typhoon season

% of month affected by tropical storms
1.3%
0
0
1.4%
1.8%
1.7%
4.7%
6.9%
7.6%
7.9%
4.5%
2%
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

The Guam tropical storm risk chart above shows the typhoon season for Agana, Guam. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.

More about tropical storms

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