Sioux Falls, SD Weather by Month and Climate Averages

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.

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.

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. The sun is out about 34% of daylight hours. 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. The sun is out about 50% of daylight hours. 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. The sun is out about 40% of daylight hours. 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. The sun is out about 46% of daylight hours. 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. The sun is out about 42% of daylight hours. 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. The sun is out about 55% of daylight hours. 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. The sun is out about 63% of daylight hours. 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. The sun is out about 63% of daylight hours. 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. The sun is out about 68% of daylight hours. 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. The sun is out about 58% of daylight hours. 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. The sun is out about 51% of daylight hours. 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. The sun is out about 41% of daylight hours. 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 sunshine about 68% of daylight hours. January is the cloudiest, at 34%. Over the year the sun shines about 51% of daylight hours. 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 20 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

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 on record brought 5.4 in of rain, 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.

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?

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 sunshine about 68% of daylight hours. 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.