August weather forecast and climate
Des Moines, IA

City buildings in Des Moines, Iowa
City buildings in Des Moines, Iowa

Weather in August

The last month of the summer, August, is also a moderately hot month in Des Moines, Iowa, with average temperature varying between 81.7°F (27.6°C) and 62.6°F (17°C).

Temperature

In Des Moines, the average high-temperature is relatively the same as in July - a still moderately hot 81.7°F (27.6°C). In Des Moines, Iowa, in August, the average low-temperature is 62.6°F (17°C).

Heat index

The average heat index is calculated to a tropical 87.6°F (30.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
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', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, metabolic differences, clothing, and wind 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In August, the average relative humidity is 78%.

Rainfall

In Des Moines, during August, the rain falls for 11.8 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Des Moines, Iowa, during the entire year, the rain falls for 114.4 days and collects up to 16.38" (416mm) of precipitation.

Snowfall

June through September are months without snowfall in Des Moines, Iowa.

Daylight

In August, the average length of the day in Des Moines is 13.8h.

Sunshine

The average sunshine in Des Moines, Iowa, is 9.9h.

UV index

Months with the highest UV index in Des Moines are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Des Moines?

In August, in Des Moines, the average high-temperature is 81.7°F (27.6°C), and the average low-temperature is 62.6°F (17°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in August is estimated at 87.6°F (30.9°C).

What is the average humidity in August in Des Moines?

In August, the average relative humidity in Des Moines is 78%.

How much does it rain in Des Moines in August?

In Des Moines, Iowa, during August, the rain falls for 11.8 days and regularly aggregates up to 1.85" (47mm) of precipitation.

When it does not snow in Des Moines?

June through September are months without snowfall in Des Moines, Iowa.

What is the average length of the day in August in Des Moines?

The average length of the day in August is 13.8h.

How many hours of sunshine does Des Moines have in August?

The average sunshine in August is 9.9h.

What is the month with the highest UV index in Des Moines?

Months with the highest UV index in Des Moines, Iowa, are June through August, with an average maximum UV index of 6.

What is the UV index reading in August in Des Moines?

In Des Moines, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in August
Des Moines, IA

Average temperature in August - Des Moines, IA
  • Average high temperature in August: 81.7°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in August: 62.6°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

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Average pressure in August
Des Moines, IA

Average pressure in August - Des Moines, IA
  • Average pressure in August: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
Des Moines, IA

Average wind speed in August - Des Moines, IA
  • Average wind speed in August: 7mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in August
Des Moines, IA

Average humidity in August - Des Moines, IA
  • Average humidity in August: 78%

Months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in August
Des Moines, IA

Average rainfall in August - Des Moines, IA
  • Average rainfall in August: 1.85"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in August
Des Moines, IA

Average rainfall days in August - Des Moines, IA
  • Average rainfall days in August: 11.8 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (3 days).

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Average snowfall in August
Des Moines, IA

Average snowfall in August - Des Moines, IA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (2.24").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Des Moines, IA

Average snowfall days in August - Des Moines, IA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (8.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Des Moines, IA

Average daylight in August / Average sunshine in August - Des Moines, IA
  • Average daylight in August: 13.8h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in August: 9.9h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 4.3h).

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Average sunshine days in August
Des Moines, IA

Average sunshine days in August - Des Moines, IA
  • Average sunshine days in August: 16.7 days

The month with the most sunshine days is December (22.3 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in August
Des Moines, IA

Average UV index in August - Des Moines, IA
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in August
Des Moines, IA

Average cloud cover in August - Des Moines, IA
  • Average cloud cover in August: 30

The month with the most cloud cover is January (Cloud cover 54).
Months with the least cloud cover are July and September (Cloud cover 29).

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Average visibility in August
Des Moines, IA

Average visibility in August - Des Moines, IA
  • 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).

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