August weather forecastDes Moines, WA
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Des Moines, Washington, with an average temperature fluctuating between 77.7°F (25.4°C) and 53.6°F (12°C).Temperature
Des Moines's August weather, with an average high temperature of 77.7°F (25.4°C) and an average low temperature of 53.6°F (12°C), tends to be the warmest of the year.Humidity
In August, the average relative humidity is 69%.Rainfall
In Des Moines, in August, during 5.7 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. In Des Moines, during the entire year, the rain falls for 138.2 days and collects up to 14.09" (358mm) of precipitation.Snowfall
April through October are months without snowfall in Des Moines.Ocean temperature
The month with the warmest seawater is August, with an average ocean temperature of 53.8°F (12.1°C).Note: Unprotected swimming in 53.8°F (12.1°C) is dangerous due to potential cold shock. Especially when temperatures go below 50°F (10°C), leading to hyperventilation.
Daylight
In Des Moines, the average length of the day in August is 14h and 11min.On the first day of the month, sunrise is at 5:48 am and sunset at 8:42 pm. On the last day of August, in Des Moines, sunrise is at 6:28 am and sunset at 7:50 pm PDT.
Sunshine
The month with the most sunshine is August, with an average of 10.7h of sunshine.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A typical high UV index of 5 in August suggests the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Direct Sun exposure should be minimized especially during midday when radiation is most intense. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Des Moines, WA
- Average high temperature in August: 77.7°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in August: 53.6°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in August
Des Moines, WA
- Average pressure in August: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in August
Des Moines, WA
- Average wind speed in August: 3.6mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.6mph).
Average humidity in August
Des Moines, WA
- Average humidity in August: 69%
The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (68%).
Average rainfall in August
Des Moines, WA
- Average rainfall in August: 0.47"
The wettest month (with the highest rainfall) is December (2.2").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in August
Des Moines, WA
- Average rainfall days in August: 5.7 days
The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is August (5.7 days).
Average snowfall in August
Des Moines, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Des Moines, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in August
Des Moines, WA
- Average sea temperature in August: 53.7°F
The best month for swimming (with the highest average sea temperature) is August (53.7°F).
The coldest month (with the lowest average sea temperature) is February (45.8°F).
Average daylight in August /
Average sunshine in August
Des Moines, WA
- Average daylight in August: 14h and 12min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in August: 10h and 42min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in August
Des Moines, WA
- Average sunshine days in August: 22.8 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (13 days).
Average UV index in August
Des Moines, WA
- Average UV index in August: 5
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
Des Moines, WA
- Average cloud cover in August: 26
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in August
Des Moines, WA
- Average visibility in August: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
