August weather forecast
Des Moines, IA

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

Weather in August

August, the last month of the summer in Des Moines, is another warm month, with an average temperature ranging between min 62.6°F (17°C) and max 81.7°F (27.6°C).

Temperature

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

Heat index

The average heat index in August is estimated at a hot 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', 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 by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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 Des Moines, the average relative humidity in August is 78%.

Rainfall

In August, in Des Moines, the rain falls for 11.8 days. Throughout August, 1.85" (47mm) of precipitation is accumulated. Throughout the year, in Des Moines, there are 114.4 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

Snowfall

In Des Moines, snow does not fall in June through September.

Daylight

In Des Moines, the average length of the day in August is 13h and 48min.
On the first day of August, sunrise is at 6:09 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:50 pm CDT.

Sunshine

The average sunshine in August is 9.9h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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. 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.
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FAQ

What is the temperature in August in Des Moines?

In Des Moines, in August, 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. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in August in Des Moines?

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

How many days does it rain in August in Des Moines?

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?

In Des Moines, Iowa, snow does not fall in June through September.

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

In Des Moines, the average day length in August is 13h and 48min.

When are sunrise and sunset in August in Des Moines?

On the first day of August in Des Moines, sunrise is at 6:09 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:50 pm CDT.

How long on average sun shines in August in Des Moines?

In Des Moines, Iowa, the average sunshine duration in August is 9.9h.

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

The 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, Iowa, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The 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").
The 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).
The 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: 13h and 48min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in August: 9h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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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

The 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).
The 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

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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