Agana weather in August 2025

Expect 31°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Agana in August. Check more long-term weather averages for Agana in August before you book your next holiday to Guam in 2025/2026.

  • 31°C maximum daytime temperature in August in Agana31
    31°C max day temperature
  • 5 hours of sunshine per day
  • 20 days with some rainfall in August in Agana20
    20 days with some rainfall
  • 25°C minimum night-time temperature in August in Agana25
    25°C min night temperature
  • 13 hours of daylight per day in August in Agana13
    13 hours of daylight per day
  • Very high heat & humidity in August in AganaVH
    Very High heat & humidity
  • 363 mm monthly rainfall in August in Agana363
    363 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Agana11
    11+ (Extreme) UV index
  • 29°C sea temperature in August in Agana29
    29°C sea temperature

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The August 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 August?

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

How sunny is it in Agana in August?

There are normally 5 hours of bright sunshine each day in Agana in August - that's 37% of daylight hours.

How warm is the sea around Agana in August?

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

Does it rain in Agana in August?

There are usually 20 days with some rain in Agana in August and the average monthly rainfall is 363mm.

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

On average 2.2 days in August in Agana are likely to be affected by the passage of one or more tropical storms.

Agana August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 06:06 18:49
Saturday, 16th August 2025 06:08 18:42
Sunday, 31st August 2025 06:10 18:33

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