Best year time to visit Guam

General weather information about Guam

Average annual temperature is 15.8 °C

Absolute maximum temperature: 36.7 °C

Absolute minimum temperature: -7.9 °C

Number of sunny days: 200 days

Number of rainy days: 164 days

Number of snow days: 1 day

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* Weather data for Guam United States is based on climate observations for 2026 year

Guam air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)20.422.723.427.530.835.835.236.732.229.825.518.7
Average daytime temperature (°C)10.813.014.821.026.430.731.930.728.121.815.111.5
Average temperature (°C)6.07.49.114.720.524.426.525.622.416.49.66.8
Average night temperature (°C)2.33.24.59.315.118.522.021.417.612.15.23.3
Absolute minimum temperature (°C)-6.7-7.9-6.22.57.212.716.615.913.3-2.2-3.1-5.3

Guam monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.012.011.010.09.0
Daylight mean duration (h)10.010.812.013.114.114.614.413.512.411.210.29.7
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.97.27.610.411.612.911.510.310.68.27.96.7
Precipitation (mm)17413720611746389414640681855
Sunny days14171417172081618182021
Rainy days171017131410231512131010
Snow days010000000000

Guam - weather forecast by months

Guam weather in januaryGuam weather in februaryGuam weather in marchGuam weather in aprilGuam weather in mayGuam weather in juneGuam weather in julyGuam weather in augustGuam weather in septemberGuam weather in octoberGuam weather in novemberGuam weather in december

Best time to visit Guam:

The best time to visit Guam during the most sunny months:

  • May — 11.6(h)
  • June — 12.9(h)

The largest precipitation sum in Guam is at

  • January — 174(mm)
  • February — 137(mm)
  • March — 206(mm)
  • August — 146(mm)

    • Weather forecast in the closest to Guam admin centers

    Weather forecast in the closest towns to Guam

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    Frequently asked questions

    When is the best time to visit Guam?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Guam.
    What is the weather like in Guam?
    See average temperature, rainfall and daylight hours for Guam by month in the table above.
    How many sunny days does Guam have?
    The monthly weather statistics above show sunshine and rainfall patterns for Guam throughout the year.