Guam Weather & Climate: Best Time to Visit
Guam, Micronesia, has a stable climate with little temperature variation across the year. Average daytime temperatures hover around 29°C (84°F), peaking in June at 30°C (86°F) and dipping in February to 28°C (82°F).
The city receives considerable rainfall, with around 2128 mm (84 in) annually. August is the wettest month. It has a distinct rainy season from July to November. May is the sunniest month, averaging 7.4 hours of sunshine per day.
Monthly Temperature in Guam
With minimal seasonal shifts, Guam experiences a constant climate year-round. Typically, average maximum daytime temperatures range from a comfortable 30°C (86°F) in June to a comfortable 28°C (82°F) in the coolest month, February.
Nights vary from 27°C (81°F) in June to around 26°C (79°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Guam
Guam has a notably wet climate with abundant precipitation, recording 2128 mm (84 in) of rainfall per year. The climate in Guam shows significant variation throughout the year. Expect heavy rainfall in August, the wettest month, with an average of 362 mm (14 in) of precipitation over 20 rainy days.
In contrast, the driest month March offers drier and sunnier days, with around 59 mm (2.3 in) of rainfall over 20 rainy days. For more details, please visit our Guam Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Guam
For those who appreciate different seasons, Guam serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 7.4 hours of sunshine daily, and embrace the darker days in September, offering only 4.4 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Guam 3-Day Forecast
Check the conditions for any month of the year.
Best Time to Visit Guam
With its warm weather, Guam experiences temperatures from 28°C (82°F) to 30°C (86°F) throughout the year. January, February, March, April, May and December offers the driest weather, which makes it a good time to visit.It's smart to plan your activities during the cooler morning hours or take advantage of the refreshing evenings.
Note that June, July, August, September, October and November make up the rainy season, with heavier precipitation expected. Ready to plan your travels but need destination ideas? Our smart tool recommends places based on the climate conditions you prefer. Start planning with our destination weather tool.
