Guam Climate Guides

The Guam Climate Guide is perfect for planning your holiday. Monthly weather averages give the best indication of what the weather is usually like for every month of the year including figures for temperature, rainfall and sunshine.

Guam Weather Guam Summary Guam Climate Guam Today Guam Forecast Guam When Best
Guam Weather Guam Summary Guam Climate Guam Today Guam Forecast Guam When Best
J F M A M J J A S O N D
Max Daytime Temperature (°C) 30°C (86°F) Max Daytime Temperature in January in Guam (Agana) 30°C (86°F) Max Daytime Temperature in February in Guam (Agana) 30°C (86°F) Max Daytime Temperature in March in Guam (Agana) 31°C (88°F) Max Daytime Temperature in April in Guam (Agana) 31°C (88°F) Max Daytime Temperature in May in Guam (Agana) 31°C (88°F) Max Daytime Temperature in June in Guam (Agana) 31°C (88°F) Max Daytime Temperature in July in Guam (Agana) 31°C (88°F) Max Daytime Temperature in August in Guam (Agana) 31°C (88°F) Max Daytime Temperature in September in Guam (Agana) 31°C (88°F) Max Daytime Temperature in October in Guam (Agana) 31°C (88°F) Max Daytime Temperature in November in Guam (Agana) 30°C (86°F) Max Daytime Temperature in December in Guam (Agana)
Min Night-time Temperature (°C) 24°C (75°F) Min Night-time Temperature in January in Guam (Agana) 24°C (75°F) Min Night-time Temperature in February in Guam (Agana) 24°C (75°F) Min Night-time Temperature in March in Guam (Agana) 24°C (75°F) Min Night-time Temperature in April in Guam (Agana) 25°C (77°F) Min Night-time Temperature in May in Guam (Agana) 25°C (77°F) Min Night-time Temperature in June in Guam (Agana) 25°C (77°F) Min Night-time Temperature in July in Guam (Agana) 25°C (77°F) Min Night-time Temperature in August in Guam (Agana) 25°C (77°F) Min Night-time Temperature in September in Guam (Agana) 25°C (77°F) Min Night-time Temperature in October in Guam (Agana) 25°C (77°F) Min Night-time Temperature in November in Guam (Agana) 25°C (77°F) Min Night-time Temperature in December in Guam (Agana)
Hours of Sunshine (Daily) 6 Hours of Bright Sunshine per day (50% of Daylight Hours) in January in Guam (Agana) 6 Hours of Bright Sunshine per day (53% of Daylight Hours) in February in Guam (Agana) 7 Hours of Bright Sunshine per day (58% of Daylight Hours) in March in Guam (Agana) 7 Hours of Bright Sunshine per day (58% of Daylight Hours) in April in Guam (Agana) 7 Hours of Bright Sunshine per day (56% of Daylight Hours) in May in Guam (Agana) 7 Hours of Bright Sunshine per day (50% of Daylight Hours) in June in Guam (Agana) 5 Hours of Bright Sunshine per day (41% of Daylight Hours) in July in Guam (Agana) 5 Hours of Bright Sunshine per day (37% of Daylight Hours) in August in Guam (Agana) 5 Hours of Bright Sunshine per day (38% of Daylight Hours) in September in Guam (Agana) 4 Hours of Bright Sunshine per day (37% of Daylight Hours) in October in Guam (Agana) 5 Hours of Bright Sunshine per day (40% of Daylight Hours) in November in Guam (Agana) 5 Hours of Bright Sunshine per day (41% of Daylight Hours) in December in Guam (Agana)
Hours of Daylight (Daily) 11 Hours of Daylight in January in Guam (Agana) 12 Hours of Daylight in February in Guam (Agana) 12 Hours of Daylight in March in Guam (Agana) 12 Hours of Daylight in April in Guam (Agana) 13 Hours of Daylight in May in Guam (Agana) 13 Hours of Daylight in June in Guam (Agana) 13 Hours of Daylight in July in Guam (Agana) 13 Hours of Daylight in August in Guam (Agana) 12 Hours of Daylight in September in Guam (Agana) 12 Hours of Daylight in October in Guam (Agana) 12 Hours of Daylight in November in Guam (Agana) 11 Hours of Daylight in December in Guam (Agana)
Heat and Humidity Discomfort High Heat & Humidity in January in Guam (Agana) High Heat & Humidity in February in Guam (Agana) High Heat & Humidity in March in Guam (Agana) Very High Heat & Humidity in April in Guam (Agana) Very High Heat & Humidity in May in Guam (Agana) Very High Heat & Humidity in June in Guam (Agana) Very High Heat & Humidity in July in Guam (Agana) Very High Heat & Humidity in August in Guam (Agana) Very High Heat & Humidity in September in Guam (Agana) Very High Heat & Humidity in October in Guam (Agana) Very High Heat & Humidity in November in Guam (Agana) High Heat & Humidity in December in Guam (Agana)
Days with some Rainfall 21 Days with some Rainfall in January in Guam (Agana) 19 Days with some Rainfall in February in Guam (Agana) 20 Days with some Rainfall in March in Guam (Agana) 19 Days with some Rainfall in April in Guam (Agana) 20 Days with some Rainfall in May in Guam (Agana) 19 Days with some Rainfall in June in Guam (Agana) 21 Days with some Rainfall in July in Guam (Agana) 23 Days with some Rainfall in August in Guam (Agana) 20 Days with some Rainfall in September in Guam (Agana) 22 Days with some Rainfall in October in Guam (Agana) 21 Days with some Rainfall in November in Guam (Agana) 22 Days with some Rainfall in December in Guam (Agana)
Monthly Rainfall (mm) 305 mm (12.0 inches) Monthly Rainfall in January in Guam (Agana) 271 mm (10.7 inches) Monthly Rainfall in February in Guam (Agana) 289 mm (11.4 inches) Monthly Rainfall in March in Guam (Agana) 323 mm (12.7 inches) Monthly Rainfall in April in Guam (Agana) 521 mm (20.5 inches) Monthly Rainfall in May in Guam (Agana) 560 mm (22.0 inches) Monthly Rainfall in June in Guam (Agana) 876 mm (34.5 inches) Monthly Rainfall in July in Guam (Agana) 1272 mm (50.1 inches) Monthly Rainfall in August in Guam (Agana) 1117 mm (44.0 inches) Monthly Rainfall in September in Guam (Agana) 987 mm (38.9 inches) Monthly Rainfall in October in Guam (Agana) 697 mm (27.4 inches) Monthly Rainfall in November in Guam (Agana) 466 mm (18.3 inches) Monthly Rainfall in December in Guam (Agana)
Chance of Ground Frost No Chance of Ground Frost in January in Guam (Agana) No Chance of Ground Frost in February in Guam (Agana) No Chance of Ground Frost in March in Guam (Agana) No Chance of Ground Frost in April in Guam (Agana) No Chance of Ground Frost in May in Guam (Agana) No Chance of Ground Frost in June in Guam (Agana) No Chance of Ground Frost in July in Guam (Agana) No Chance of Ground Frost in August in Guam (Agana) No Chance of Ground Frost in September in Guam (Agana) No Chance of Ground Frost in October in Guam (Agana) No Chance of Ground Frost in November in Guam (Agana) No Chance of Ground Frost in December in Guam (Agana)
UV Index (Maximum) UV (Maximum) Index 10 (Very High) in January in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in February in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in March in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in April in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in May in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in June in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in July in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in August in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in September in Guam (Agana) UV (Maximum) Index 11+ (Extreme) in October in Guam (Agana) UV (Maximum) Index 10 (Very High) in November in Guam (Agana) UV (Maximum) Index 9 (Very High) in December in Guam (Agana)
Sea Temperature (°C) 28°C (82°F) Sea Temperature in January in Guam (Agana) 28°C (82°F) Sea Temperature in February in Guam (Agana) 28°C (82°F) Sea Temperature in March in Guam (Agana) 28°C (82°F) Sea Temperature in April in Guam (Agana) 29°C (84°F) Sea Temperature in May in Guam (Agana) 29°C (84°F) Sea Temperature in June in Guam (Agana) 29°C (84°F) Sea Temperature in July in Guam (Agana) 29°C (84°F) Sea Temperature in August in Guam (Agana) 29°C (84°F) Sea Temperature in September in Guam (Agana) 29°C (84°F) Sea Temperature in October in Guam (Agana) 29°C (84°F) Sea Temperature in November in Guam (Agana) 28°C (82°F) Sea Temperature in December in Guam (Agana)
J F M A M J J A S O N D
Guam Holidays Guam Flights Guam Hotels Guam Hire Cars Guam Villas Guam Transfers
Guam Holidays Guam Flights Guam Hotels Guam Hire Cars Guam Villas Guam Transfers

The Guam Climate Guide shown above is based on the Agana Climate Guide. Please note that the weather may vary across this region. Below is a list of all the destinations in Guam with available Climate Guides.

  Agana  

Guam is the most southerly island of the Marianas Archipelago, in the Pacific Ocean over 2,000 kilometres (1,250 miles) to the east of the Philippines. Colonial Spanish influences are still evident in the lively capital Agana, although Spain ceded Guam to the United States in 1898, and the American government now maintains two large bases on the island.

Tourism is Guam's leading industry, with visitors arriving mainly from Japan in search of duty free shopping. Though the island has some nice beaches the best is off-limits to non-military personnel.

The northern two-thirds of Guam consists of a raised rolling limestone plateau with pockets of dense jungle that give the island a truly tropical feel. The northern coast is rugged with cliffs dropping precipitously into the sea, where huge Pacific swells have hollowed out an intricate tunnel of sea-caves along the base.

The south of the island is basically volcanic with an elongated mountain ridge dividing the inland valleys and coastline. The far south widens into a landscape of high hills and valleys cut by streams and waterfalls. The rolling hills, which are steep in places are mostly grass-covered, with trees growing only in the protected more fertile valleys. The best beaches are found along the sheltered coastline of the west, home to blindingly white sand and coral reefs.

The climate is tropical with rainfall in all months becoming heavy during the peak rainy season from July to December. Rainfall eases during the drier season from January to June when March is usually the sunniest month. Temperatures are consistently warm or hot all year with high heat and humidity.

On the average, one typhoon passes close by Guam each year usually between the months of August and December.

Guam Weather by Month

Check the weather for a particular month in Guam by selecting a month from the list below. Alternatively check which month usually has the Best Weather in Guam. If you are not sure where to go, why not try our Holiday Planner.
  · January
  · February
  · March
  · April
  · May
  · June
  · July
  · August
  · September
  · October
  · November
  · December
Popular Climate Guide Regions

1.

Thailand

2.

Maldives

3.

Barbados

4.

Dominican Republic

5.

Cancun and Riviera Maya, Mexico

6.

Cuba

7.

Sri Lanka

8.

Antigua

9.

Goa, India

10.

Jamaica

Popular Climate Guide Destinations

1.

Cape Town, South Africa

2.

Mombasa, Kenya

3.

Sydney, New South Wales, Australia

4.

Bangkok, Thailand

5.

Male, Maldives

6.

Bridgetown, Barbados

7.

Santo Domingo, Dominican Republic

8.

Cancun, Cancun and Riviera Maya, Mexico

9.

Havana, Cuba

10.

Colombo, Sri Lanka