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Sioux Falls, SD Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Sioux Falls, SD?
Sioux Falls, SD gets 27.8 in of precipitation a year over about 104 rainy days, and about 45.3 in of snow a season. July is the warmest month (average high 84°F) and January the coldest (average low 8°F).
Humid continental climate
Sioux Falls, SD has warm summers and cold winters. Daytime highs range from about 26°F in January to 84°F in July. June is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically May and September, when daytime highs sit near 72°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 11° | 29° |
| Spring | Mar–May | 35° | 57° |
| Summer | Jun–Aug | 60° | 82° |
| Autumn | Sep–Nov | 37° | 60° |
How much rain does Sioux Falls get?
Sioux Falls gets 27.8 in of precipitation in an average year, spread over about 104 days with measurable rain. That is more rainy days than 64% of the US.
June is the wettest month, with 4.2 in. January is the driest, with 0.6 in. May has the most rainy days, about 12.
The longest dry spell in the last five years lasted 27 days, to November 24, 2023.
From September 2025 to August 2026 Sioux Falls got 14.4 in of rain, against a normal of 27.8 in for those months. May 2026 had the most, with 4.0 in.
See where Sioux Falls ranks: rainiest cities in the US, US cities with the most rainy days.
Does it snow in Sioux Falls?
Yes. Sioux Falls gets about 45.3 in of snow in an average season, measured at the reporting station.
The snowiest winter on record is 1983–84, with 75.0 in.
The most recent measurable snow at the station fell on April 4, 2026.
From September 2025 to August 2026 the station measured 30.4 in of snow, against a normal of 45.3 in for those months. December 2025 had the most, with 12.0 in.
See where Sioux Falls ranks: snowiest cities in the US.
Sioux Falls weather by month
Sioux Falls weather in January
In January, Sioux Falls averages a high of 26°F and a low of 8°F. It gets 0.6 in of precipitation over about 7 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The January record high is 66°F (1981) and the record low is -36°F (1970).
Sioux Falls weather in February
In February, Sioux Falls averages a high of 31°F and a low of 12°F. It gets 0.8 in of precipitation over about 7 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The February record high is 70°F (1981) and the record low is -29°F (1996).
Sioux Falls weather in March
In March, Sioux Falls averages a high of 44°F and a low of 23°F. It gets 1.6 in of precipitation over about 8 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The March record high is 89°F (2026) and the record low is -17°F (2019).
Sioux Falls weather in April
In April, Sioux Falls averages a high of 58°F and a low of 35°F. It gets 3.0 in of precipitation over about 10 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The April record high is 93°F (1980) and the record low is 5°F (1975).
Sioux Falls weather in May
In May, Sioux Falls averages a high of 70°F and a low of 47°F. It gets 3.9 in of precipitation over about 12 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The May record high is 95°F (2009) and the record low is 20°F (2005). May is one of the most comfortable months to visit.
Sioux Falls weather in June
In June, Sioux Falls averages a high of 80°F and a low of 58°F. It gets 4.2 in of precipitation over about 12 rainy days. Estimated sunshine is 55% of daylight hours, derived from ERA5 cloud cover. The June record high is 110°F (1988) and the record low is 36°F (1978).
Sioux Falls weather in July
In July, Sioux Falls averages a high of 84°F and a low of 62°F. It gets 3.3 in of precipitation over about 9 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The July record high is 108°F (1989) and the record low is 38°F (1971).
Sioux Falls weather in August
In August, Sioux Falls averages a high of 82°F and a low of 60°F. It gets 3.3 in of precipitation over about 9 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The August record high is 108°F (1973) and the record low is 39°F (2004).
Sioux Falls weather in September
In September, Sioux Falls averages a high of 74°F and a low of 51°F. It gets 2.7 in of precipitation over about 8 rainy days. Estimated sunshine is 68% of daylight hours, derived from ERA5 cloud cover. The September record high is 104°F (1976) and the record low is 22°F (1974). September is one of the most comfortable months to visit.
Sioux Falls weather in October
In October, Sioux Falls averages a high of 60°F and a low of 37°F. It gets 2.4 in of precipitation over about 8 rainy days. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. The October record high is 95°F (2023) and the record low is 9°F (1972).
Sioux Falls weather in November
In November, Sioux Falls averages a high of 44°F and a low of 24°F. It gets 1.2 in of precipitation over about 6 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The November record high is 82°F (2020) and the record low is -13°F (1996).
Sioux Falls weather in December
In December, Sioux Falls averages a high of 31°F and a low of 13°F. It gets 0.8 in of precipitation over about 7 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The December record high is 63°F (1998) and the record low is -28°F (1990).
Sunshine, humidity and wind in Sioux Falls
September is the sunniest month in Sioux Falls, with estimated sunshine of 68% of daylight hours from ERA5 cloud cover. January is the cloudiest, at 34%. The annual cloud-cover estimate is 51% of daylight hours; it is not a measurement of sunshine duration. Sioux Falls is sunnier than 65% of the US.
Humidity peaks in January at 76% and is lowest in April at 56%.
Wind averages 10 mph over the year, and April is the windiest month at 12 mph.
Sioux Falls has about 21 days a year above 90°F. Sioux Falls is cooler than 60% of the US.
Thunderstorms occur on about 42 days a year.
See where Sioux Falls ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Sioux Falls
The first fall freeze in Sioux Falls typically comes around October 3, and the last spring freeze around May 3. That leaves a frost-free growing season of about 153 days.
Sioux Falls weather records
These records cover SIOUX FALLS during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Sioux Falls station is 110°F, on June 21, 1988. The coldest is -36°F, on January 19, 1970.
The wettest day in the available station history brought 5.4 in of precipitation, on August 7, 2022.
37 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.6°F per decade since 1970.
The best time to visit Sioux Falls
The most comfortable time to visit is typically May and September, when daytime highs sit near 72°F.
Winter (December–February) is cold, with average highs around 29°F and lows near 11°F. Snow is possible.
Spring (March–May) is mild, with average highs around 57°F and lows near 35°F.
Summer (June–August) is warm, with average highs around 82°F and lows near 60°F.
Autumn (September–November) is mild, with average highs around 60°F and lows near 37°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 8° | 26° | 0.60 in | 7 | 10 mph | 76% | 34% | 66° | -36° |
| February | 12° | 31° | 0.83 in | 7 | 10 mph | 67% | 50% | 70° | -29° |
| March | 23° | 44° | 1.6 in | 8 | 11 mph | 63% | 40% | 89° | -17° |
| April | 35° | 58° | 3.0 in | 10 | 12 mph | 56% | 46% | 93° | 5° |
| May | 47° | 70° | 3.9 in | 12 | 11 mph | 59% | 42% | 95° | 20° |
| June | 58° | 80° | 4.2 in | 12 | 10 mph | 56% | 55% | 110° | 36° |
| July | 62° | 84° | 3.3 in | 9 | 9 mph | 67% | 63% | 108° | 38° |
| August | 60° | 82° | 3.3 in | 9 | 9 mph | 69% | 63% | 108° | 39° |
| September | 51° | 74° | 2.7 in | 8 | 10 mph | 61% | 68% | 104° | 22° |
| October | 37° | 60° | 2.4 in | 8 | 10 mph | 59% | 58% | 95° | 9° |
| November | 24° | 44° | 1.2 in | 6 | 10 mph | 66% | 51% | 82° | -13° |
| December | 13° | 31° | 0.83 in | 7 | 10 mph | 72% | 41% | 63° | -28° |
Station: SIOUX FALLS, 5 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Sioux Falls climate questions
How much rain does Sioux Falls get?
Sioux Falls gets 27.8 in of precipitation in an average year, over about 104 rainy days.
What is the wettest month in Sioux Falls?
June is the wettest month in Sioux Falls, with 4.2 in. January is the driest, with 0.6 in.
How many rainy days does Sioux Falls have a year?
Sioux Falls has about 104 days with measurable rain in an average year. May has the most, about 12.
Does it snow in Sioux Falls?
Yes. Sioux Falls gets about 45.3 in of snow in an average season. The snowiest winter on record is 1983–84, with 75.0 in.
What is the hottest month in Sioux Falls?
July is the warmest month in Sioux Falls, with an average high of 84°F.
What is the coldest month in Sioux Falls?
January is the coldest month in Sioux Falls, with an average low of 8°F.
What is the record high temperature in Sioux Falls?
Within the available 1970–2026 station history, the record high at the Sioux Falls station is 110°F, set on June 21, 1988. The record low is -36°F, on January 19, 1970.
What is the sunniest month in Sioux Falls?
September is the sunniest month in Sioux Falls, with estimated sunshine of 68% of daylight hours from ERA5 cloud cover. January is the cloudiest.
When is the first frost in Sioux Falls?
The first fall freeze in Sioux Falls typically comes around October 3. The last spring freeze is around May 3.
What is the best time to visit Sioux Falls?
The most comfortable time to visit is typically May and September, when daytime highs sit near 72°F.