August weather forecast and climate
Hagåtña, GU

August, the last month of the summer, in Hagåtña, is another warm month, with average temperature varying between 82.4°F (28°C) and 84.7°F (29.3°C).

Temperature

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

Heat index

The average heat index in August is evaluated 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 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, pregnancy, wind, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

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

Rainfall

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

Ocean temperature

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

Daylight

In Hagåtña, the average length of the day is 12.6h.

Sunshine

In August, the average sunshine is 7.6h.

UV index

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Hagåtña. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

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.

What is the temperature in August in Hagåtña?

In Hagåtña, in August, 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. 'felt air temperature', 'real feel'), that combines relative humidity and air temperature, in August is evaluated 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?

The average relative humidity in August in Hagåtña is 76%.

How many days does it rain in August in Hagåtña?

In Hagåtña, in August, it is raining for 28.9 days, with typically 9.76" (248mm) of accumulated precipitation.

When 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 Hagåtña, Guam, the average seawater temperature in August is 85.5°F (29.7°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in August in Hagåtña?

In Hagåtña, Guam, the average length of the day in August is 12.6h.

How many hours of sunshine does Hagåtña have in August?

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

When is the highest UV index in Hagåtña?

Months with the highest UV index in Hagåtña, Guam, are January through August, October through December, with an average maximum UV index of 7.

How high is the UV index in August in Hagåtña?

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

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

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

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).

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

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%).

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").

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

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).

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).

Average daylight in August / Average sunshine in August - Hagåtña, GU
  • Average daylight in August: 12.6h

The month with the longest days is June (Average daylight: 12.9h).
The month with the shortest days is December (Average daylight: 11.3h).

  • Average sunshine in August: 7.6h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is November (Average sunshine: 6.3h).

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).

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

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).

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

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

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

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