Best Time to Visit Guam
Month-by-month climate guide for planning a trip to Guam.
Guam does not have a month that clearly fits our sunny profiles at a country-wide average. Its warmest and driest window is around May (28°C / 82.4°F) and March (75 mm / 3 in rainfall) — usually the practical travel choice. The drier half of the year covers December–June, while the wetter half runs through July–November. Country-wide monthly temperatures range from 26.5°C / 79.7°F in January to 28°C / 82.4°F in May, and monthly rainfall from 75 mm / 3 in (March) to 350 mm / 13.8 in (August). Guam's climate is broadly tropical. These are national area-weighted averages from long-term climate normals — regional variation within Guam can be substantial, especially for large or geographically diverse countries. Below, every month is classified against our five weather profiles so you can match your travel window to your preferred weather.
Recommended months
| Month | Temp | Rain | Feels like |
|---|---|---|---|
| March | 27°C80.6°F | 75 mm3″ | — |
| April | 27.5°C81.5°F | 90 mm3.5″ | Tropical |
| February | 26.5°C79.7°F | 100 mm3.9″ | Tropical |
No month in Guam fits our sunny profiles at a country-wide average. The three above are the driest-and-warmest fallback.
Frequently asked questions
When is the best time to visit Guam?
Guam doesn't have a month that clearly matches our sunny profiles at a national average. The practical travel window centres on March (driest, ~75 mm / 3 in) and May (warmest, 28°C / 82.4°F). Regional variation within Guam can be significant — city and subdivision pages give a more localised view.
When is the rainy season in Guam?
The rainy season in Guam runs through July–November, when monthly rainfall exceeds the national annual median of about 150 mm / 5.9 in. The wettest single month is August, averaging 350 mm / 13.8 in.
What is the dry season in Guam?
The drier half of the year in Guam covers December–June, when monthly rainfall stays at or below the annual median of about 150 mm / 5.9 in. The driest single month is March with about 75 mm / 3 in.
What months should I avoid visiting Guam?
The least comfortable months for travel in Guam — based on our climate data — are January, February, March, August, September, October, December. These are Guam's wettest or coolest months. Rainfall peaks at 350 mm / 13.8 in in August, and temperatures bottom out at 26.5°C / 79.7°F in January.
Is there a shoulder season in Guam?
Shoulder-season months in Guam — moderate weather, lower rainfall than the wet season — include January, February, March, April, May, June, November, December. These are typically the quietest and cheapest months for travel, and often deliver decent weather without the peak-season crowd.