Island, Guam
Guam weather by month and the best time to visit
When to go to Guam
Jan–May is drier, cooler and calm. Jun–Dec is wet, humid and typhoon season; Mar–Jun is also busy with Japanese and Korean visitors.
Guam weather by month
Average daily high, rainfall and conditions.
- Jan28°82 mm
- Feb28°51 mm
- Mar28°42 mm
- Apr28°47 mm
- May29°62 mm
- Jun29°97 mm
- Jul29°197 mm
- Aug29°315 mm
- Sep29°278 mm
- Oct29°231 mm
- Nov29°136 mm
- Dec28°69 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 28°C82°F | 27°C81°F | 82 mm | 78% | Pleasant |
| February | 28°C82°F | 27°C80°F | 51 mm | 78% | Pleasant |
| March | 28°C82°F | 27°C80°F | 42 mm | 78% | Pleasant |
| April | 28°C83°F | 27°C81°F | 47 mm | 79% | Pleasant |
| May | 29°C84°F | 28°C82°F | 62 mm | 80% | Pleasant |
| June | 29°C84°F | 28°C83°F | 97 mm | 80% | Pleasant |
| July | 29°C84°F | 28°C83°F | 197 mm | 82% | Rainy |
| August | 29°C84°F | 28°C82°F | 315 mm | 82% | Very wet |
| September | 29°C84°F | 28°C82°F | 278 mm | 82% | Rainy |
| October | 29°C84°F | 28°C83°F | 231 mm | 82% | Rainy |
| November | 29°C84°F | 28°C83°F | 136 mm | 80% | Pleasant |
| December | 28°C83°F | 28°C82°F | 69 mm | 79% | Pleasant |
Quick answers
What is the best month to visit Guam?
Jan–May. Jan–May is drier, cooler and calm. Jun–Dec is wet, humid and typhoon season; Mar–Jun is also busy with Japanese and Korean visitors.
When is the rainy season in Guam?
Rain peaks in August with about 315 mm. Months with 150 mm or more: Jul–Oct.
What is the hottest month in Guam?
June, with average highs of 29°C (84°F).
How cold does Guam get?
The coolest nights are in February, averaging 27°C (80°F).
More about Guam
Going to Guam solo?
SoloSquare is where travelers, nomads and locals in Guam meet up for small plans: coffee, dinners, walks and day trips. Join one, or start your own in a minute.
Sources
- NASA POWER climatology (2001–2020)
- Guam Visitors Bureau
- Guam International Airport Authority
- Guam Regional Medical City
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.