Weather in Des Moines in September 2025
Average weather
Average temperature in Des Moines in September
Going from a maximum of +36°C during the day to a minimum of +9°C during the night, the temperature in September averages around +28°C.
The average maximum temperature goes up 4% by the end of the month, compared with the beginning of the month, from +32°C to +33°C.
Is Des Moines warm or cold in September?
Des Moines is typically warm in September.
Maximum temperatures go down compared to the previous month from +29°C to +25°C. The minimum temperature also goes down from +18°C to +14°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Des Moines:
Climate in Des Moines in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +29°C | +25°C | +18°C | ||||
| Min. temperature | ||||||
| +5°C | -1°C | -11°C | ||||
| Max. temperature | ||||||
| +40°C | +38°C | +33°C | ||||
| Rainfall | ||||||
| 122 mm | 96 mm | 81 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 72% | 69% | 67% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 7 | 10 | 9 | ||||
| Cloudy days | ||||||
| 8 | 8 | 10 | ||||
| Rainy days | ||||||
| 14 | 11 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 1 | ||||
September weather is still as good as in August. It’s getting colder in September. From +29°C in the day, the average maximum temperature lowers to +25°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 122 mm to 96 mm. It feels drier, as humidity decreases from 72% to 69%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The good news is there are likely to be more sunny days in September, from 7 to 10.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Des Moines is gradually increasing during September, going from 3 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Des Moines?
Climate Change over Years
The climate in Des Moines in September has not changed much over the last 43 years.
The average temperature was the lowest in 1993 (+14°C) and the highest in 2012 (+19°C). The driest year was 1988 with only 568 mm of rainfall, and the wettest year was 2019 with 1423 mm.
FAQ
Is September a good time to visit Des Moines?
Can you sunbathe in Des Moines in September?
Is Des Moines rainy in September?
Is it sunny in Des Moines in September?
Other cities in USA
Monthly weather in Des Moines
Source of the data
For this page, we’ve looked at the typical weather in Des Moines, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
