Monthly weather forecast and climate
Sioux Falls, SD

The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline
The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline

Weather in January

January, the same as December, in Sioux Falls, South Dakota, is a freezing cold winter month, with average temperature fluctuating between 23.4°F (-4.8°C) and 9.7°F (-12.4°C). The coldest month is January, with an average high-temperature of 23.4°F (-4.8°C) and an average low-temperature of 9.7°F (-12.4°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Sioux Falls, South Dakota, with temperature in the range of an average low of 13.1°F (-10.5°C) and an average high of 27°F (-2.8°C). In Sioux Falls, the average high-temperature in February is practically the same as in January - a still freezing cold 27°F (-2.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Sioux Falls, South Dakota, with average temperature ranging between min 27.7°F (-2.4°C) and max 43.2°F (6.2°C). In March, the average high-temperature significantly increases, from a subzero cold 27°F (-2.8°C) in February, to a chilly 43.2°F (6.2°C). Weather in March »

Weather in April

April is a moderate spring month in Sioux Falls, South Dakota, with average temperature ranging between max 55.4°F (13°C) and min 38.5°F (3.6°C). In Sioux Falls, the average high-temperature in April increases, from a chilly 43.2°F (6.2°C) in March, to a moderate 55.4°F (13°C). Weather in April »

Weather in May

May, the last month of the spring, in Sioux Falls, is an enjoyable month, with average temperature varying between 50.4°F (10.2°C) and 67.5°F (19.7°C). In May, the average high-temperature rises, from a mild 55.4°F (13°C) in April, to an enjoyable 67.5°F (19.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Sioux Falls, South Dakota, with temperature in the range of an average low of 60.3°F (15.7°C) and an average high of 77.5°F (25.3°C). In June, the average high-temperature increases, from an enjoyable 67.5°F (19.7°C) in May, to a warm 77.5°F (25.3°C). Weather in June »

Weather in July

July, like June, in Sioux Falls, South Dakota, is a moderately hot summer month, with average temperature ranging between max 82.4°F (28°C) and min 63.1°F (17.3°C). July is the warmest month, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 63.1°F (17.3°C). In July, the average heat index is evaluated at a tropical 88.5°F (31.4°C). Weather in July »

Weather in August

August, the last month of the summer, in Sioux Falls, is also a moderately hot month, with average temperature varying between 59.5°F (15.3°C) and 81.1°F (27.3°C). In Sioux Falls, the average high-temperature in August is almost the same as in July - a still warm 81.1°F (27.3°C). Weather in August »

Weather in September

September, the first month of the autumn, in Sioux Falls, is still a warm month, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 53.2°F (11.8°C). In Sioux Falls, the average high-temperature slightly decreases, from a moderately hot 81.1°F (27.3°C) in August, to a still warm 74.3°F (23.5°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Sioux Falls, South Dakota, with temperature in the range of an average low of 41.2°F (5.1°C) and an average high of 57.4°F (14.1°C). In Sioux Falls, the average high-temperature in October significantly decreases, from a moderately hot 74.3°F (23.5°C) in September, to a mild 57.4°F (14.1°C). Weather in October »

Weather in November

November, the last month of the autumn, in Sioux Falls, is another chilly month, with average temperature ranging between min 29.3°F (-1.5°C) and max 43.2°F (6.2°C). In November, the average high-temperature drops, from a mild 57.4°F (14.1°C) in October, to a chilly 43.2°F (6.2°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Sioux Falls, South Dakota, with average temperature fluctuating between 15.6°F (-9.1°C) and 27.5°F (-2.5°C). In Sioux Falls, the average high-temperature declines considerably, from a frosty 43.2°F (6.2°C) in November, to a subzero cold 27.5°F (-2.5°C). Weather in December »
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FAQ

What is the coldest month in Sioux Falls?

With an average high-temperature of 23.4°F (-4.8°C) and an average low-temperature of 9.7°F (-12.4°C), January is the coldest month.

What is the most humid month in Sioux Falls?

The most humid month in Sioux Falls is January, with an average relative humidity of 88%.

How many days does it rain in Sioux Falls?

Throughout the year, in Sioux Falls, South Dakota, there are 117.1 rainfall days, and 20.71" (526mm) of precipitation is accumulated.

What is the driest month in Sioux Falls?

Months with the least rainfall in Sioux Falls are January, February and November Rain falls for 3.8 days and accumulates 0.67" (17mm) of rain.

When does it snow in Sioux Falls?

January through May, October through December are months with snowfall in Sioux Falls, South Dakota.

How many days does it snow in Sioux Falls?

Throughout the year, in Sioux Falls, South Dakota, there are 48.7 snowfall days, and 18.23" (463mm) of snow is accumulated.

What is the month with the least sunshine in Sioux Falls?

With an average of 4h of sunshine, January has the least sunshine of the year.

When is the lowest UV index in Sioux Falls?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sioux Falls.

What is the snowiest month in Sioux Falls?

The month with the most snowfall in Sioux Falls, South Dakota, is February when snow falls for 8.9 days and typically aggregates up to 4.25" (108mm) of snow.

What is the wettest month in Sioux Falls?

The month with the most rainfall in Sioux Falls is June when the rain falls for 17.8 days and typically aggregates up to 3.27" (83mm) of precipitation.

When it does not snow in Sioux Falls?

In Sioux Falls, South Dakota, snow does not fall in June through September.

When are the longest days in Sioux Falls?

June has the longest days of the year in Sioux Falls, South Dakota, with an average of 15.4h of daylight.

What are the months with the highest UV index in Sioux Falls?

Months with the highest UV index in Sioux Falls are June and July, with an average maximum UV index of 6.

What is the warmest month in Sioux Falls?

July is the warmest month in Sioux Falls, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 63.1°F (17.3°C).

What month has the most sunshine in Sioux Falls?

The month with the most sunshine is July, with an average of 10.7h of sunshine.

What is the least humid month in Sioux Falls?

October is the least humid month, with an average relative humidity of 66%.

What is the month with the shortest days in Sioux Falls?

The month with the shortest days in Sioux Falls is December, with an average of 9h of daylight.

Average temperature
Sioux Falls, SD

Average temperature - Sioux Falls, SD

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (23.4°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).

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Average pressure
Sioux Falls, SD

Average pressure - Sioux Falls, SD

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed
Sioux Falls, SD

Average wind speed - Sioux Falls, SD

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity
Sioux Falls, SD

Average humidity - Sioux Falls, SD

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (66%).

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Average rainfall
Sioux Falls, SD

Average rainfall - Sioux Falls, SD

The wettest month (with the highest rainfall) is June (3.27").
The driest months (with the least rainfall) are January, February and November (0.67").

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Average rainfall days
Sioux Falls, SD

Average rainfall days - Sioux Falls, SD

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).

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Average snowfall
Sioux Falls, SD

Average snowfall - Sioux Falls, SD

The month with the highest snowfall is February (4.25").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Sioux Falls, SD

Average snowfall days - Sioux Falls, SD

The month with the highest number of snowfall days is January (11.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Sioux Falls, SD

Average daylight / Average sunshine - Sioux Falls, SD

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4h).

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Average sunshine days
Sioux Falls, SD

Average sunshine days - Sioux Falls, SD

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is June (10 days).

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Average UV index
Sioux Falls, SD

Average UV index - Sioux Falls, SD

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Sioux Falls, SD

Average visibility - Sioux Falls, SD

Months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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