Annual average weather for Guam

Best
Best
Best
Best
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Sea
28°
Swim
Sea
28°
Swim
Sea
28°
Swim
Sea
28°
Swim
Sea
29°
Swim
Sea
29°
Swim
Sea
29°
Swim
Sea
29°
Swim
Sea
29°
Swim
Sea
30°
Swim
Sea
29°
Swim
Sea
28°
Swim

Annual Average Weather for Guam

The annual average maximum daily temperature is 30.5°C (86.8°F) which is very hot and perfect for sunbathing on clear days. The annual average water temperature is typically 28.7°C (83.6°F) which is very warm and ideal for relaxing and swimming for the whole day. Annually there are on average 26.0 days of rain per month and 8.1 hours of sun per day.

Quick Links →

When is the best time to visit Guam?

The best months to visit Guam are February, March, April, May, for the best beach weather, the most sunshine and optimal sunbathing and swimming conditions with the least chance of rain.

The sea is best for swimming between June and November when the sea temperature is above the average 29°C (84°F) which is very warm and ideal for relaxing and swimming for the whole day.

Can you sunbathe in Guam year round?

Yes, you can sunbathe in Guam all year round.

The coolest month in Guam is February when the average maximum temperature is 30°C (85°F), average temperature is 27°C (81°F) and average minimum temperature is 24°C (76°F).

More info about the annual temperatures and sunshine.

Can you swim in Guam year round?

Yes, you can swim in Guam all year round.

The warmest sea water temperatures in Guam are found in October when they peak at 30°C (85°F) and lowest in March when they dip to 28°C (82°F).

The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.

More info about the annual sea temperatures

When is the hottest month in Guam?

The hottest month in Guam is June when the average maximum temperature is very hot and perfect for sunbathing on clear days 31°C (88°F), average temperature is 29°C (83°F) and average minimum temperature is 26°C (79°F).

More info about the annual temperatures and sunshine.

When is the coldest month in Guam?

The coolest month in Guam is February when the average maximum temperature is 30°C (85°F), average temperature is 27°C (81°F) and average minimum temperature is 24°C (76°F).

More info about the annual temperatures and sunshine

When is the sunniest month in Guam?

The sunniest days in Guam are in May which has the most hours of sunshine per day. In May the sunshine percentage is 73% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.3hrs making the days long and bright.

More info about the annual sunshine.

When is the least sunny month in Guam?

December has the least sunshine. In December the sunshine percentage is 58% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 6.6 hours of sunshine per day.

More info about the annual sunshine.

When is the driest month in Guam?

The driest month in Guam is April with 5.9cm (2.3inches) of rain and May has the fewest days of rain with 22.6 days with some rain, a very wet time to visit the beach.

More info about the annual rainfall

When is the wettest month in Guam?

The wettest month in Guam is August with 34.7cm (13.7inches) of rain and July has the most days of rain with 28.3 days with some rain, a very wet time to visit the beach.

More info about the annual rainfall.

When is the sea the coldest in Guam?

The coldest sea water temperatures in Guam are found in March when they dip to 28°C (82°F) which is very warm and ideal for relaxing and swimming for the whole day.

More info about the annual sea temperatures.

When is the sea the warmest in Guam?

The warmest sea water temperatures in Guam are found in October when they peak at 30°C (85°F) which is very warm and ideal for relaxing and swimming for the whole day.

More info about the annual sea temperatures.

When is the most humid month in Guam?

The most humid month in Guam is September with a dew point (an indicator of humidity) of 26°C (78°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.

More info about the annual humidity.

When is the least humid month in Guam?

The least humid month in Guam is February with a dew point of 23°C (74°F) which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

More info about the annual humidity.

When is the windiest month in Guam?

The most windy month in Guam is February when the average maximum windspeed is 31KM/H (19MPH) and the average wind speed is 18KM/H (11MPH).

More info about the annual wind conditions.

Annual Temperature for Guam

The hottest month in Guam is June when the average maximum temperature is 31°C (88°F), average temperature is 29°C (83°F) and average minimum temperature is 26°C (79°F).

The coolest month in Guam is February when the average maximum temperature is 30°C (30°F), average temperature is 27°C (81°F) and average minimum temperature is 24°C (76°F).

Annual Sunshine for Guam

The longest days in Guam are in June, with an average of 12.9 hours of daylight per day. December has the shortest days with an average of 11.3 hours of daylight per day.

The sunniest days in Guam are in May which has the most hours of sunshine per day. The sunshine percentage is 73% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.3hrs making the days long and bright.

December has the least sunshine. The sunshine percentage is 58% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 6.6 hours of sunshine per day.

The ultraviolet index is the highest in April when it reaches 14.4 and lowest in December when it reaches 9.5.

An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Annual Sea Temperature for Guam

The warmest sea water temperatures in Guam are found in October when they peak at 30°C (85°F) and lowest in March when they dip to 28°C (82°F).

The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.

Annual Rainfall for Guam

The wettest month in Guam is August with 34.7cm (13.7inches) of rain and July has the most days of rain with 28.3 days with some rain, a very wet time to visit the beach.

The driest month in Guam is April with 5.9cm (2.3inches) of rain and May has the fewest days of rain with 22.6 days with some rain, a very wet time to visit the beach.

Annual Humidity for Guam

The most humid month in Guam is September with a dew point (an indicator of humidity) of 26°C (78°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.

The least humid month in Guam is February with a dew point of 23°C (74°F) which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

Annual Wind Speed for Guam

The most windy month in Guam is February when the average maximum windspeed is 31KM/H (19MPH) and the average wind speed is 18KM/H (11MPH).

The least windy month in Guam is August when the average maximum windspeed is 23KM/H (14MPH) and the average wind speed is 10KM/H (6MPH).

Best Beaches

PICK A MONTH FOR BEST BEACHES IN GUAM

Quick Links →

Monthly Averages

Suggested Beaches

Book Accomodation Deals

Booking.com Search FlightsImage