Weather in Tumon Bay, Guam in September

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Visiting Tumon Bay, Guam in September

The weather in September is slightly warmer than the previous month. September has average maximum temperatures of 30°C (87°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 70% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright. It is not an optimal time for sunbathing but it is possible on clearer days in Tumon Bay.

September has total rainfall of 30.3cm (11.9inches) making it rainy with a chance of occasional heavy tropical showers. There are 28.1 days with some rainfall so there are very few dry days to enjoy the beach.

Sea temperatures are a very warm 29°C (85°F). September is an excellent month for swimming in Tumon Bay with very comfortable temperatures for bathing all day. The sea temperature in September is slightly cooler than the previous month.

September experiences a mix of sunny days and rain showers, making it a good month for swimming, sunbathing, snorkeling, and diving. The winds begin to decrease, but there are still suitable conditions for windsurfing, kitesurfing, and surfing enthusiasts. Consider visiting Tumon Bay in the months of February, March, April, May, for the best beach weather. Also consider one of our other suggestions for September.

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Can you sunbathe in Tumon Bay in September?

Yes, September is not an optimal time for sunbathing but it is possible on clearer days in Tumon Bay.

September has average maximum temperatures of 30°C (87°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 70% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright. September has total rainfall of 30.3cm (11.9inches) making it rainy with a chance of occasional heavy tropical showers. There are 28.1 days with some rainfall so there are very few dry days to enjoy the beach.

More about September temperature and sunshine.

Can you swim in Tumon Bay in September?

Yes, September is an excellent month for swimming in Tumon Bay with very warm sea temperatures 29°C (85°F).

More about September sea temperatures.

Is September a good time to holiday in Tumon Bay?

Yes, September is a good time for a holiday in Tumon Bay.

September has average maximum temperatures of 30°C (87°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 70% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright. September has total rainfall of 30.3cm (11.9inches) making it rainy with a chance of occasional heavy tropical showers. There are 28.1 days with some rainfall so there are very few dry days to enjoy the beach. It is not an optimal time for sunbathing but it is possible on clearer days in Tumon Bay. Sea temperatures are a very warm 29°C (85°F). September is an excellent month for swimming in Tumon Bay with very comfortable temperatures for bathing all day.

More about the September temperatures and sunshine.

Is Tumon Bay warm in September?

Yes, Tumon Bay is very hot and perfect for sunbathing on clear days in September.

The average maximum temperature in Tumon Bay in September is 30°C (87°F). The average maximum temperature is 30°C (86°) in the previous month and 30°C (86°F) in the next month.

The average temperature in Tumon Bay in September is 28°C (82°F). The average temperature is 27°C (81°F) in the previous month and 28°C (82°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Tumon Bay in September?

The average day light hours per day in Tumon Bay in September are 12.2. The sunshine percentage is 70% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright.

More about September sunshine.

Crowds in Tumon Bay in September

September sees a decrease in crowds at Tumon Bay, as the rainy season continues and summer vacations come to an end. There are no major holidays or events during this month, making it a more peaceful time to visit the beach.

Temperature in Tumon Bay in September

The weather in September is slightly warmer than the previous month. The average maximum temperature in Tumon Bay in September is 30°C (87°F). The average maximum temperature is 30°C (86°F) in the previous month and 30°C (86°F) in the next month.

The average temperature in Tumon Bay in September is 28°C (82°F). The average temperature is 27°C (81°F) in the previous month and 28°C (82°F) in the next month.

The average minimum temperature in Tumon Bay in September is 25°C (77°F). The minimum temperature is 25°C (76°F) in the previous month and 25°C (77°F) in the next month.

Sunshine in Tumon Bay in September

The days in September are marginally shorter than the previous month and days continue to get marginally shorter into October. September has fewer hours of sunshine than the previous month and hours of sunshine continue to drop into October. During September the average day light hours are 12.2 per day in Tumon Bay. The sunshine percentage is 70% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright.

The ultraviolet index in Tumon Bay in September is typically 13.7 during September. 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.

Sea Temperature in Tumon Bay in September

The average sea water temperature in Tumon Bay in September is 29.3°C (84.7°F) which is very warm and ideal for relaxing and swimming for the whole day. The sea temperature in September is slightly cooler than the previous month.

Rainfall in Tumon Bay in September

September weather is drier than the previous month and rainfall continues to drop quickly into October. September has a few more days of rain than the previous month. The average total rainfall in Tumon Bay in September is 30.3cm (11.9inches) and on average there are 28.1 rainy days in September making it a very wet time to visit the beach.

Humidity in Tumon Bay in September

The maximum dew point (an indicator of humidity) in Tumon Bay in September is 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 dew point is 25°C (78°F) in the previous month and 25°C (25°F) in the next month.

The average maximum relative humidity in Tumon Bay in September is typically 94.8%. The maximum relative humidity is 94.9% in the previous month and 94.1% in the next month.

The average relative humidity in Tumon Bay in September is typically 83.9%. The average relative humidity is 83.9% in the previous month and 83.8% in the next month.

Wind Speed in Tumon Bay in September

The average maximum wind speed in Tumon Bay in September is typically 23KM/H (14MPH). The average maximum wind speed is 23KM/H (14MPH) in the previous month and 24KM/H (15MPH) in the next month.

The average wind speed in Tumon Bay in September is typically 10KM/H (6MPH). The average wind speed is 10KM/H (6MPH) in the previous month and 11KM/H (7MPH) in the next month.

The average wind direction in Tumon Bay in September is from the East-Southeast.

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Suggested Beaches in September

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