Agana weather in January 2026

Expect daytime maximum temperatures of 86°F in Agana, Guam in January and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 23 days with some rainfall and typically 5.1 inches of rainfall in the month.

  • 86°F maximum daytime temperature in January in Agana86
    86°F max day temperature
  • 6 hours of sunshine per day
  • 23 days with some rainfall in January in Agana23
    23 days with some rainfall
  • 75°F minimum night-time temperature in January in Agana75
    75°F min night temperature
  • 11 hours of daylight per day in January in Agana11
    11 hours of daylight per day
  • High heat & humidity in January in AganaH
    High heat & humidity
  • 5.1 inches monthly rainfall in January in Agana5.1
    5.1 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in January in Agana10
    10 (Very High) UV index
  • 82°F sea temperature in January in Agana82
    82°F sea temperature

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The January 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)  |  Imperial (°F)

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How hot is it in Agana in January?

Daytime temperatures usually reach 86°F in Agana in January with high heat and humidity, falling to 75°F at night.

How sunny is it in Agana in January?

There are normally 6 hours of bright sunshine each day in Agana in January - that's 50% of daylight hours.

How warm is the sea around Agana in January?

The average sea temperature around Agana in January is 82°F.

Does it rain in Agana in January?

There are usually 23 days with some rain in Agana in January and the average monthly rainfall is 5.1 inches.

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

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

Agana January sunrise & sunset times

Browse the sunrise and sunset times for Agana in January 2026. Select a month to view Agana sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 06:44 18:05
Friday, 16th January 2026 06:48 18:13
Saturday, 31st January 2026 06:48 18:21

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