Current Weather and Forecast in Sioux Falls, SD
South Dakota, United States 🇺🇸
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About the weather in Sioux Falls
Sioux Falls has a humid continental climate. July is the warmest month, with average highs of 83°, and January the coldest, when nights fall to around 11°. May brings the most rain, on about 12 days, while July is the sunniest, with 13.2 hours of sunshine a day. Over a whole year it rains on roughly 91 days.
Sioux Falls climate guide: monthly averages, seasons and the best time to visit
Common questions
How often does it rain in Sioux Falls?
About 91 days bring measurable precipitation, totalling 30.0 inches (761 mm). That works out at roughly 8.4 mm on an average wet day.
What is the best month to go to Sioux Falls?
The best time to visit Sioux Falls is generally June to October, when these are the warmest and brightest weeks of the year. Daytime temperatures in that window sit near 76°F (24°C), with rain on about 8 days a month. For the same question asked the other way round, see where else is warm in June.
When does Sioux Falls drop below freezing?
Average overnight lows sit at or below 0°C in 5 months of the year, November through March.
How sunny is Sioux Falls?
9.2 hours a day averaged over the year, peaking in July at 13.2 hours.
Is there snow in Sioux Falls?
Yes - about 19 days a year carry measurable snowfall, concentrated October through April.
What is the hottest month in Sioux Falls?
July, averaging 83°F (28°C) by day and 65°F (18°C) overnight. The hottest single day in our 2015-2024 record for this location reached 102°F (39°C).
When does it rain most in Sioux Falls?
May, at 4.3 inches (110 mm) over about 12 days. February is the driest month, at 22 mm (0.9 in).
Which month is coolest in Sioux Falls?
January, with highs of 27°F (-3°C) and lows near 11°F (-11°C). The coldest day in the 2015-2024 record fell to -24°F (-31°C).