Weatheo

Des Moines Weather by Month

Average temperatures, rainfall and humidity for Des Moines, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Des Moines month looks like before you travel — then check the live Des Moines forecast for the days ahead.

Warmest month

July

30°C average high

Coolest month

January

-9°C average low

Wettest month

September

92 mm of rain

Driest month

February

9 mm of rain

Average temperature and rainfall in Des Moines by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January0°C-9°C-30°C / 15°C
14 mm
76%16 km/h
February3°C-8°C-28°C / 25°C
9 mm
72%16 km/h
March11°C0°C-25°C / 33°C
43 mm
67%18 km/h
April17°C5°C-10°C / 30°C
68 mm
63%19 km/h
May23°C12°C0°C / 36°C
89 mm
67%15 km/h
June29°C18°C8°C / 38°C
82 mm
69%13 km/h
July30°C19°C11°C / 38°C
51 mm
73%12 km/h
August29°C18°C9°C / 38°C
68 mm
75%12 km/h
September26°C15°C0°C / 37°C
92 mm
73%13 km/h
October18°C8°C-6°C / 33°C
66 mm
68%15 km/h
November10°C0°C-18°C / 25°C
30 mm
71%16 km/h
December4°C-5°C-26°C / 23°C
25 mm
76%15 km/h

Best time to visit Des Moines

The most comfortable time to visit Des Moines is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around September, totalling about 637 mm a year.

Travellers who prefer heat should aim for July, when highs average 30°C. September is the month to avoid if rain would spoil your plans — it averages 92 mm, roughly 10× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Des Moines forecast for what is happening now.

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