Dense Fog Advisory
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Portions of northwest and west central Iowa, northeast
Nebraska, and southeast South Dakota.
* WHEN...Until 10 AM CDT this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
Dense Fog Advisory
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Portions of northwest Iowa, northeast Nebraska, and
southeast South Dakota.
* WHEN...Until 10 AM CDT this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
Tomorrow in Sioux Falls looks
sunny, with a high of 94°
and an overnight low of 65°.
Precipitation chance is modest at 36%.
Winds top out near 17 mph,
and the UV index reaches 7 (high).
Located in South Dakota, United States, Sioux Falls experiences a humid continental climate with warm summers and cold, often snowy winters. Afternoon temperatures peak near 83°F (28°C) in July and dip to about 27°F (-3°C) in January, with around 30.0 inches (761 mm) of precipitation falling across the year.
Sioux Falls weather: quick facts
Hottest month: July - highs near 83°F (28°C)
Coldest month: January - highs near 27°F (-3°C)
Record high: 102°F (39°C) · Record low: -24°F (-31°C) (2015–2024)
Wettest month: May (12 rainy days) · Sunniest: July (13.2 h sun/day)
Climate type:humid continental - warm summers and cold, often snowy winters
Snow: about 19 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 83°F (28°C) and overnight lows stay near 65°F (18°C). The coolest month is January, with typical highs of 27°F (-3°C) and lows around 11°F (-11°C). Based on 2015–2024 weather data, temperatures have reached as high as 102°F (39°C) and dropped as low as -24°F (-31°C).
Rain, sun and snow
May is usually the wettest month. It brings about 4.3 inches (110 mm) of rain over 12 days, while February is the driest. July brings the most sunshine, averaging 13.2 hours of sun a day. Snow falls on about 19 days in a typical year, mostly from October through April.
Season by season
Spring (March through May)
Spring in Sioux Falls is crisp but comfortable, with daytime highs averaging 57°F (14°C) and nights around 37°F (3°C); expect showers on roughly 28 days across the season, plus around 5 snowy days.
Summer (June through August)
Summer in Sioux Falls brings hot afternoons, with daytime highs averaging 82°F (28°C) and nights around 63°F (17°C); expect showers on roughly 26 days across the season.
Fall (September through November)
Fall in Sioux Falls is crisp but comfortable, with daytime highs averaging 60°F (16°C) and nights around 43°F (6°C); expect showers on roughly 20 days across the season, plus around 2 snowy days.
Winter (December through February)
Winter in Sioux Falls is frigid, with daytime highs averaging 30°F (-1°C) and nights around 14°F (-10°C); rain falls on about 16 days over the three months, plus around 11 snowy days. Wind makes those temperatures feel harsher than they sound - pair the forecast winds with the wind speed converter to judge conditions on exposed skin.
Average temperatures in Sioux Falls by month
Monthly averages for Sioux Falls based on 2015–2024 weather data.
July is the hottest month in Sioux Falls, with average highs of 83°F (28°C) and overnight lows near 65°F (18°C). In the past decade the temperature has peaked at 102°F (39°C).
What is the coldest month in Sioux Falls?
January is the coldest month, with highs averaging 27°F (-3°C) and lows around 11°F (-11°C). The lowest reading in recent years was -24°F (-31°C).
What is the rainiest month in Sioux Falls?
May is typically the wettest month, averaging 4.3 inches (110 mm) of precipitation across about 12 days. February is usually the driest.
Does it snow in Sioux Falls?
Yes. Sioux Falls averages about 19 days of snowfall a year, concentrated October through April.
What is the best time to visit Sioux Falls?
The best time to visit Sioux Falls is generally June to October, when this window offers the warmest, brightest days of the year. Daytime temperatures in that window typically sit near 76°F (24°C).
How sunny is Sioux Falls?
Sioux Falls averages 9.2 hours of sunshine per day across the year. July is the sunniest month at about 13.2 hours of sun a day.
Is Sioux Falls humid?
Relative humidity in Sioux Falls averages about 68% over the year, which feels fairly humid. Combined with July heat, muggy conditions are common in summer - the dew point is the number to watch.