Sioux Falls, SD Weather
Sioux Falls hourly forecast: next 24 hours
Today's high of 86°F (30°C) is about 5°F (3°C) above the typical August high of 81°F (27°C).
Current conditions in detail
Sioux Falls weather tomorrow (Friday, August 14)
Tomorrow in Sioux Falls looks overcast, with a high of 77° and an overnight low of 68°. There is a 62% chance of rain - plan accordingly. Winds top out near 14 mph, and the UV index reaches 1 (low).
Sioux Falls 14-day forecast
About the weather in Sioux Falls
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
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 27° | 11° | 5 | 1.0 in | 6.1 h/day | 75% |
| February | 31° | 13° | 5 | 0.9 in | 7.9 h/day | 66% |
| March | 45° | 26° | 6 | 2.2 in | 8.3 h/day | 66% |
| April | 56° | 36° | 10 | 3.6 in | 9.2 h/day | 62% |
| May | 69° | 49° | 12 | 4.3 in | 10.3 h/day | 65% |
| June | 81° | 62° | 10 | 4.0 in | 12.8 h/day | 64% |
| July | 83° | 65° | 7 | 2.6 in | 13.2 h/day | 70% |
| August | 81° | 63° | 9 | 3.2 in | 11.4 h/day | 72% |
| September | 76° | 58° | 8 | 2.7 in | 10.1 h/day | 67% |
| October | 59° | 42° | 7 | 2.5 in | 8.0 h/day | 64% |
| November | 45° | 29° | 5 | 1.5 in | 6.9 h/day | 68% |
| December | 33° | 18° | 6 | 1.5 in | 5.9 h/day | 73% |