🇬🇺 Guam, U.S.

Guam Weather by Month

Guam is generally drier from January to May and wetter from July to November. Tropical storms and typhoons are an important late-summer and autumn consideration.

How to use this guide Choose a month to compare 10-year average high/low temperatures, rainfall, rainy days, and recent 3-year daily weather calendars.

January–December weather

Each month has its own detailed weather page.

January weatherDry season

January is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.

February weatherDry season

February is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.

March weatherDry season

March is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.

April weatherDry season

April is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.

May weatherDry season

May is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.

June weatherTransition season

June typically falls in a transition season pattern. Compare temperature, rainfall and recent-year weather below before choosing your dates.

July weatherWet season

July is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.

August weatherWet season · Typhoon risk

August can be affected by typhoons. Recheck forecasts, flights, ferries and outdoor plans shortly before departure.

September weatherWet season · Typhoon risk

September can be affected by typhoons. Recheck forecasts, flights, ferries and outdoor plans shortly before departure.

October weatherWet season · Typhoon risk

October can be affected by typhoons. Recheck forecasts, flights, ferries and outdoor plans shortly before departure.

November weatherWet season · Typhoon risk

November can be affected by typhoons. Recheck forecasts, flights, ferries and outdoor plans shortly before departure.

December weatherTransition season

December typically falls in a transition season pattern. Compare temperature, rainfall and recent-year weather below before choosing your dates.