September 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 September in Des Moines?

In Des Moines, Iowa, in September, the average high-temperature is 76.1°F (24.5°C), and the average low-temperature is 55.2°F (12.9°C).

How much does it rain in Des Moines in September?

In September, the rain falls for 8.4 days. Throughout September, 3.1" (77.5mm) of precipitation is accumulated.

Does it snow in Des Moines in September?

In Des Moines, in September, it doesn't snow. In October, it regularly snows.
Average temperature in September - Des Moines, IA
  • Average high temperature in September: 24.5°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 September: 12.9°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 September - Des Moines, IA
  • Average humidity in September: 70.9%

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

Average rainfall in September - Des Moines, IA
  • Average rainfall in September: 77.5mm

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 September - Des Moines, IA
  • Average rainfall days in September: 8.4 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 September - Des Moines, IA
  • Average snowfall in September: 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 September - Des Moines, IA
  • Average snowfall days in September: 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 September / Average sunshine in September - Des Moines, IA
  • Average daylight in September: 12.5h

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 September: 8h

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

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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