August weather forecast and climate
Des Moines, IA

A close view of city buildings in Des Moines, Iowa, USA
A close view of city buildings in Des Moines, Iowa, USA

What is the temperature in August in Des Moines?

The average high-temperature, in August, in Des Moines, Iowa, is 83.8°F (28.8°C), while the average low-temperature is 64.8°F (18.2°C).

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

In Des Moines, Iowa, in August, it is raining for 9.1 days, with typically 4.1" (104.9mm) of accumulated precipitation.
Average temperature in August - Des Moines, IA
  • Average high temperature in August: 28.8°C

The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is January (-0.6°C).

  • Average low temperature in August: 18.2°C

The month with the highest average low temperature is July (19.3°C).
The coldest month (with the lowest average low temperature) is January (-9.8°C).

Average humidity in August - Des Moines, IA
  • Average humidity in August: 70%

The month with the highest relative humidity is December (74.6%).
The month with the lowest relative humidity is May (63%).

Average rainfall in August - Des Moines, IA
  • Average rainfall in August: 104.9mm

The wettest month (with the highest rainfall) is June (125.5mm).
The driest month (with the lowest rainfall) is January (25.4mm).

Average rainfall days in August - Des Moines, IA
  • Average rainfall days in August: 9.1 days

The month with the highest number of rainy days is May (12.5 days).
The month with the lowest number of rainy days is January (7.5 days).

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

The month with the highest snowfall is December (228.6mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

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 (6.5 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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 shortest days is December (Average daylight: 9.2h).

  • Average sunshine in August: 9.6h

The month with most sunshine is July (Average sunshine: 10.9h).
The month with least sunshine is December (Average sunshine: 4.2h).

Average UV index in August - Des Moines, IA
  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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