Cloudy skies · South Dakota
How cloudy is Sioux Falls?
In a typical year, the sky over Sioux Falls is mostly cloudy or overcast about 36% of the time, and clear or nearly clear about 56%.
January is the cloudiest month, mostly cloudy about 45% of the time, and July the least cloudy, at about 22%. Across winter, December to February, it’s mostly cloudy about 43% of the time. That makes it the 34th least cloudy sky of the 116 US cities we track.
Last updated
The forecast for the next 48 hours doesn’t have the sky mostly cloudy at any point.
Sioux Falls is clear or nearly clear about 56% of the time, so the prairie gets more sky than most of the Midwest.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
The sky at a glance
| Mostly cloudy or overcast, all year | 36% |
|---|---|
| Clear or nearly clear, all year | 56% |
| Mostly cloudy, December to February | 43% |
| Cloudiest month | January, 45% |
| Least cloudy month | July, 22% |
Shares of hours across a typical year. Mostly cloudy means at least five eighths of the sky covered; clear or nearly clear means two eighths or less.
Cities with about the same sky
- Waterloo, Iowa: mostly cloudy about 36% of the time
- Asheville, North Carolina: mostly cloudy about 36% of the time
- Corpus Christi, Texas: mostly cloudy about 36% of the time
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00014944. Airport sensors see cloud up to about 12,000 feet, so thin high cloud isn’t counted.