Best time to visit Guam

Find the best time to visit Guam and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Guam by month

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When is the best time to visit Guam?

The best time to visit 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

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.

Best time to visit

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.

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

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Guam travel features

Do you want to learn more about Guam? Read our latest features covering travel tips and insider destination guides on where to go and what to do in Guam.

We don't currently have any travel features on Guam. Discover more about holiday destinations around the world with this selection of general travel articles.

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