Guam weather in October 2025

Expect daytime maximum temperatures of 31°C in Guam in October and very high heat and humidity based on long-term weather averages. There are 4 hours of sunshine per day on average with 22 days with some rainfall and typically 317 mm of rainfall in the month.

  • 31°C maximum daytime temperature in October in Guam (Agana)31
    31°C max day temperature
  • 4 hours of sunshine per day
  • 22 days with some rainfall in October in Guam (Agana)22
    22 days with some rainfall
  • 25°C minimum night-time temperature in October in Guam (Agana)25
    25°C min night temperature
  • 12 hours of daylight per day in October in Guam (Agana)12
    12 hours of daylight per day
  • Very high heat & humidity in October in Guam (Agana)VH
    Very High heat & humidity
  • 317 mm monthly rainfall in October in Guam (Agana)317
    317 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in October in Guam (Agana)11
    11+ (Extreme) UV index
  • 29°C sea temperature in October in Guam (Agana)29
    29°C sea temperature

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The October 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 October?

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

How sunny is it in Guam in October?

There are normally 4 hours of bright sunshine each day in Agana, Guam in October - that's 37% of daylight hours.

How warm is the sea around Guam in October?

The average sea temperature around Agana, Guam in October is 29°C.

Does it rain in Guam in October?

There are usually 22 days with some rain in Agana, Guam in October and the average monthly rainfall is 317mm.

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

On average 2.5 days in October in Agana, Guam are likely to be affected by the passage of one or more tropical storms.

Guam October sunrise & sunset times

Browse the sunrise and sunset times for Guam in October 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
Wednesday, 1st October 2025 06:10 18:11
Thursday, 16th October 2025 06:12 18:01
Friday, 31st October 2025 06:15 17:54

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