Guam weather

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Recommended for Guam

The weather guide for Guam, represented by Agana, (Agana) 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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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

When is the best time to go to Guam?

The best time to go to Guam (Agana) is March based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

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Max Day Temperature (°C)

  • 30°C maximum daytime temperature in January in Guam (Agana)30
    Jan
  • 30°C maximum daytime temperature in February in Guam (Agana)30
    Feb
  • 30°C maximum daytime temperature in March in Guam (Agana)30
    Mar
  • 31°C maximum daytime temperature in April in Guam (Agana)31
    Apr
  • 31°C maximum daytime temperature in May in Guam (Agana)31
    May
  • 31°C maximum daytime temperature in June in Guam (Agana)31
    Jun
  • 31°C maximum daytime temperature in July in Guam (Agana)31
    Jul
  • 31°C maximum daytime temperature in August in Guam (Agana)31
    Aug
  • 31°C maximum daytime temperature in September in Guam (Agana)31
    Sep
  • 31°C maximum daytime temperature in October in Guam (Agana)31
    Oct
  • 31°C maximum daytime temperature in November in Guam (Agana)31
    Nov
  • 30°C maximum daytime temperature in December in Guam (Agana)30
    Dec

Hours of Sunshine (daily)

  • Jan
  • Feb
  • Mar
  • Apr
  • May
  • Jun
  • Jul
  • Aug
  • Sep
  • Oct
  • Nov
  • Dec

Best time to go for the weather

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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Which is the hottest month 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.

Which month has the most rain in Guam?

In terms of rainfall, August is usually the wettest month in Agana, Guam with 363mm on average. There are normally 20 days in August 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.

What is the time difference between Guam and the UK?

The time difference between Guam and the UK is GMT+10 hours.

What is the main language spoken in Guam?

The main language spoken in Guam is English.

Learn a language for Guam with Busuu*, Lingoda* and Rocket Languages*.

What is the currency in Guam?

The currency in Guam is the US Dollar (USD).

Send money to Guam with Monito*.

Which plugs are used in Guam?

Guam uses electrical plug type A + B (110 Volts).

Which side of the road do they drive on in Guam?

They drive on the right side of the road in Guam.

Do you need a visa for Guam?

Yes, UK passport holders do need a visa to enter Guam.

Check Guam visa requirements for all passport holders with VisaHQ*.

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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