August weather forecast
Dededo, GU

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Weather in August

The weather pattern in August maintains a steady course following July with a notable increase in rainfall reaching an unprecedented 9.76" (248mm). Moreover, the temperature ties with the previous month's high at 84.7°F (29.3°C). Despite increased rainfall, the strong tropical sun shines through painting the city with vibrant hues. The island transforms into various shades of green, providing a breathtaking view for the visiting eye. It is a paradise for nature photographers and lovers, where every drop of rain amplifies the natural beauty.

Temperature

During July and August, Dededo experiences its warmest period, with an average high-temperature of 84.7°F (29.3°C).

Heat index

August's average heat index is evaluated at a torrid 95°F (35°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

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

Rainfall

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

Daylight

In August, the average length of the day is 12h and 34min.
On the first day of the month, sunrise is at 6:05 am and sunset at 6:48 pm. On the last day of August, sunrise is at 6:09 am and sunset at 6:32 pm ChST.

Sunshine

In Dededo, the average sunshine in August 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. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 in August interprets into the following advice:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Updated: Aug 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the hottest?

The highest point of temperatures falls in July and August, when the average high-temperature ascends to 84.7°F (29.3°C).

How hot is it in August?

The average high-temperature and low-temperature during August are 84.7°F (29.3°C) and 82.4°F (28°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 95°F (35°C).

What is the least humid month?

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

What is the average humidity in August?

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

How much does it rain in August?

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

What is the average length of the day in August?

In Dededo, the average day length in August is 12h and 34min.

When is the sunrise / sunset in August?

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, sunrise is at 6:09 am and sunset at 6:32 pm ChST.

How long on average sun shines in August?

In Dededo, the average sunshine duration in August is 7.6h.

What are the months with the highest UV index?

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

How high is the UV index in August?

In August, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Dededo, GU

Average temperature in August - Dededo, 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
Dededo, GU

Average pressure in August - Dededo, 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).

Average wind speed in August
Dededo, GU

Average wind speed in August - Dededo, 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
Dededo, GU

Average humidity in August - Dededo, 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%).

Average rainfall in August
Dededo, GU

Average rainfall in August - Dededo, 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
Dededo, GU

Average rainfall days in August - Dededo, 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).

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

Average daylight in August / Average sunshine in August - Dededo, GU
  • Average daylight in August: 12h and 4min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in August: 7h and 4min

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).

Average sunshine days in August
Dededo, GU

Average sunshine days in August - Dededo, 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
Dededo, GU

Average UV index in August - Dededo, 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).

Average cloud cover in August
Dededo, GU

Average cloud cover in August - Dededo, 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).

Average visibility in August
Dededo, GU

Average visibility in August - Dededo, 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).

Dededo, Guam, USA

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