Agana weather in September 2025

Expect daytime maximum temperatures of 31°C in Agana, Guam in September and very high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with 19 days with some rainfall and typically 343 mm of rainfall in the month.

  • 31°C maximum daytime temperature in September in Agana31
    31°C max day temperature
  • 5 hours of sunshine per day
  • 19 days with some rainfall in September in Agana19
    19 days with some rainfall
  • 25°C minimum night-time temperature in September in Agana25
    25°C min night temperature
  • 12 hours of daylight per day in September in Agana12
    12 hours of daylight per day
  • Very high heat & humidity in September in AganaVH
    Very High heat & humidity
  • 343 mm monthly rainfall in September in Agana343
    343 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Agana11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Agana29
    29°C sea temperature

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The September 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 Agana in September?

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

How sunny is it in Agana in September?

There are normally 5 hours of bright sunshine each day in Agana in September - that's 38% of daylight hours.

How warm is the sea around Agana in September?

The average sea temperature around Agana in September is 29°C.

Does it rain in Agana in September?

There are usually 19 days with some rain in Agana in September and the average monthly rainfall is 343mm.

What is the chance of a typhoon in Agana in September?

On average 2.3 days in September in Agana are likely to be affected by the passage of one or more tropical storms.

Agana September sunrise & sunset times

Browse the sunrise and sunset times for Agana in September 2025. Select a month to view Agana sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:10 18:32
Monday, 15th September 2025 06:10 18:22
Tuesday, 30th September 2025 06:10 18:12

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