Guam weather in May 2025

Expect 31°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Guam in May. Check more long-term weather averages for Guam in May before you book your next holiday to Guam in 2025/2026.

  • 31°C maximum daytime temperature in May in Guam (Agana)31
    31°C max day temperature
  • 7 hours of sunshine per day
  • 20 days with some rainfall in May in Guam (Agana)20
    20 days with some rainfall
  • 25°C minimum night-time temperature in May in Guam (Agana)25
    25°C min night temperature
  • 13 hours of daylight per day in May in Guam (Agana)13
    13 hours of daylight per day
  • Very high heat & humidity in May in Guam (Agana)VH
    Very High heat & humidity
  • 142 mm monthly rainfall in May in Guam (Agana)142
    142 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Guam (Agana)11
    11+ (Extreme) UV index
  • 28°C sea temperature in May in Guam (Agana)28
    28°C sea temperature

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The May weather guide for Guam, represented by Agana, (Agana) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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

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How hot is it in Guam in May?

Daytime temperatures usually reach 31°C in Agana, Guam in May with very high heat and humidity, falling to 25°C at night.

How sunny is it in Guam in May?

There are normally 7 hours of bright sunshine each day in Agana, Guam in May - that's 56% of daylight hours.

How warm is the sea around Guam in May?

The average sea temperature around Agana, Guam in May is 28°C.

Does it rain in Guam in May?

There are usually 20 days with some rain in Agana, Guam in May and the average monthly rainfall is 142mm.

What is the chance of a typhoon in Guam in May?

On average less than 1 day in May in Agana, Guam is likely to be affected by the passage of one or more tropical storms.

Guam May sunrise & sunset times

Browse the sunrise and sunset times for Guam in May 2025. Select a month to view Guam sunrise and sunset times for the next 12 months. The Guam sunrise and sunset times shown below are for Agana.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 06:00 18:37
Friday, 16th May 2025 05:55 18:40
Saturday, 31st May 2025 05:53 18:45

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