Sioux Falls (SD) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sioux Falls.
Climate overview of Sioux Falls
Temperatures in Sioux Falls, South Dakota, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at -3°C (27°F).
With around 725 mm (29 in) of annual rain/snowfall, the city has moderate precipitation levels. June is the wettest month and January the driest. It also has a distinct dry season from November to March, with warm summers and very cold winters.
Sioux Falls Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sioux Falls - and find the best time to visit.
Monthly Temperature in Sioux Falls
The climate in Sioux Falls is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -3°C (27°F) in the coolest month, January.
Nights vary from 17°C (63°F) in July to around -14°C (7°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sioux Falls
Generally, Sioux Falls receives mid-range precipitation levels, with 725 mm (29 in) annually. The climate in Sioux Falls shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 124 mm (4.9 in) of precipitation over 13 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 16 mm (0.6 in) of snowfall over 7 snowy days. For more details, please visit our Sioux Falls Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Sioux Falls
Daily percentage of sunshine
Humidity in Sioux Falls by Month
The relative humidity is high throughout the year in Sioux Falls.
The city experiences its highest humidity in December, reaching 75%. In May, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Sioux Falls
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, July, August and September
- Warmest weather: July
- Fewest rainy days: November
- Seasonal pattern: A distinct dry season from November to March, with warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -14°C (7°F).
Frequently asked questions about the climate in Sioux Falls
What is the best time to visit Sioux Falls?
May, July, August and September typically offer the most optimal weather in Sioux Falls. In contrast, January, February, March and December tend to have less optimal conditions. Sioux Falls has a distinct dry season from November to March, with warm summers and very cold winters.
What temperatures can I expect in Sioux Falls?
Daytime highs range from -3°C (27°F) in January to 29°C (84°F) in July. Nighttime lows range from -14°C (7°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Sioux Falls get?
Annual rainfall is around 725 mm (29 in). June is the wettest month with 124 mm (4.9 in), while January is the driest with 16 mm (0.6 in).
Sioux Falls 3-Day Forecast
Sioux Falls (SD) 3-Day Forecast
Sioux Falls on the map
Sioux Falls is highlighted - select any city to see its climate.
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