August weather forecast
Hagåtña, GU

Weather in August

August, the last month of the summer in Hagåtña, is also a moderately hot month, with an average temperature ranging between max 84.7°F (29.3°C) and min 82.4°F (28°C).

Temperature

July and August, with an average high-temperature of 84.7°F (29.3°C), are the warmest months.

Heat index

In August, the average heat index is estimated at a hot 94.5°F (34.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, pregnancy, wind). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The least humid month is August, with an average relative humidity of 76%.

Rainfall

In Hagåtña, in August, it is raining for 28.9 days, with typically 9.76" (248mm) of accumulated precipitation. In Hagåtña, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 85.5°F (29.7°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Hagåtña, the average length of the day in August is 12h and 34min.
On the first day of August in Hagåtña, sunrise is at 6:05 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:33 pm ChST.

Sunshine

In August, the average sunshine in Hagåtña is 7.6h.

UV index

The months with the highest UV index in Hagåtña, Guam, are January through August, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What are the warmest months in Hagåtña?

July and August, with an average high-temperature of 84.7°F (29.3°C), are warmest months in Hagåtña, Guam.

What is the temperature in August in Hagåtña?

In August, in Hagåtña, Guam, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 82.4°F (28°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 94.5°F (34.7°C).

What is the least humid month in Hagåtña?

With an average relative humidity of 76%, August is the least humid month in Hagåtña, Guam.

What is the average humidity in August in Hagåtña?

In August, the average relative humidity in Hagåtña, Guam, is 76%.

How much does it rain in Hagåtña in August?

In Hagåtña, during August, the rain falls for 28.9 days and regularly aggregates up to 9.76" (248mm) of precipitation.

What month is the ocean warmest in Hagåtña?

With an average ocean temperature of 85.5°F (29.7°C), August is the month with the warmest seawater in Hagåtña, Guam.

What is the ocean temperature in August in Hagåtña?

In August, the average ocean temperature is 85.5°F (29.7°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Hagåtña have in August?

The average day length in August in Hagåtña, Guam, is 12h and 34min.

What time are sunrise and sunset in August in Hagåtña?

In August, on the first day of the month, sunrise is at 6:05 am and sunset at 6:48 pm. On the last day of the month, in Hagåtña, sunrise is at 6:09 am and sunset at 6:33 pm ChST.

How long on average sun shines in August in Hagåtña?

In August, the average sunshine duration is 7.6h.

What is the month with the highest UV index in Hagåtña?

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index reading in August in Hagåtña?

In Hagåtña, Guam, the average daily maximum UV index in August is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.

Average temperature in August
Hagåtña, GU

Average temperature in August - Hagåtña, GU
  • Average high temperature in August: 84.7°F

The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).

  • Average low temperature in August: 82.4°F

The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).

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Average pressure in August
Hagåtña, GU

Average pressure in August - Hagåtña, GU
  • Average pressure in August: 29.79"Hg

The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).

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Average wind speed in August
Hagåtña, GU

Average wind speed in August - Hagåtña, GU
  • Average wind speed in August: 9.6mph

The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).

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Average humidity in August
Hagåtña, GU

Average humidity in August - Hagåtña, GU
  • Average humidity in August: 76%

The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).

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Average rainfall in August
Hagåtña, GU

Average rainfall in August - Hagåtña, GU
  • Average rainfall in August: 9.76"

The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").

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Average rainfall days in August
Hagåtña, GU

Average rainfall days in August - Hagåtña, GU
  • Average rainfall days in August: 28.9 days

The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).

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Average sea temperature in August
Hagåtña, GU

Average sea temperature in August - Hagåtña, GU
  • Average sea temperature in August: 85.4°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

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Average daylight in August /
Average sunshine in August
Hagåtña, GU

Average daylight in August / Average sunshine in August - Hagåtña, GU
  • Average daylight in August: 12h and 34min

The month with the longest days is June (Average daylight: 12h and 55min).
The month with the shortest days is December (Average daylight: 11h and 21min).

  • Average sunshine in August: 7h and 36min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).

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Average sunshine days in August
Hagåtña, GU

Average sunshine days in August - Hagåtña, GU
  • Average sunshine days in August: 1.6 days

The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).

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Average UV index in August
Hagåtña, GU

Average UV index in August - Hagåtña, GU
  • Average UV index in August: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

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Average cloud cover in August
Hagåtña, GU

Average cloud cover in August - Hagåtña, GU
  • Average cloud cover in August: 46

The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).

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Average visibility in August
Hagåtña, GU

Average visibility in August - Hagåtña, GU
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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