May weather forecast
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 May

May, the last month of the spring in Sioux Falls, is a comfortable month, with an average temperature ranging between min 50.4°F (10.2°C) and max 67.5°F (19.7°C).

Temperature

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). In Sioux Falls, the average low-temperature is 50.4°F (10.2°C).

Humidity

In May, the average relative humidity in Sioux Falls is 69%.

Rainfall

In Sioux Falls, during May, the rain falls for 16.6 days and regularly aggregates up to 2.83" (72mm) of precipitation. In Sioux Falls, during the entire year, the rain falls for 117.1 days and collects up to 20.71" (526mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Sioux Falls. During 0.3 snowfall days, in May, Sioux Falls aggregates 0.24" (6mm) of snow. In Sioux Falls, during the entire year, snow falls for 48.7 days and aggregates up to 18.23" (463mm) of snow.

Daylight

In May, the average length of the day in Sioux Falls is 14h and 44min.
On the first day of May in Sioux Falls, sunrise is at 6:19 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 9:00 pm CDT.

Sunshine

In Sioux Falls, the average sunshine in May is 8.7h.

UV index

The average daily maximum UV index in May in Sioux Falls, South Dakota, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in May in Sioux Falls?

In Sioux Falls, in May, the average high-temperature is 67.5°F (19.7°C), and the average low-temperature is 50.4°F (10.2°C).

What is the average humidity in May in Sioux Falls?

In May, the average relative humidity in Sioux Falls, South Dakota, is 69%.

How much does it rain in Sioux Falls in May?

In Sioux Falls, South Dakota, during May, the rain falls for 16.6 days and regularly aggregates up to 2.83" (72mm) of precipitation.

What is the last month it snows in Sioux Falls?

May is the last month it regularly snows in Sioux Falls, South Dakota. During 0.3 snowfall days, in May, Sioux Falls aggregates 0.24" (6mm) of snow.

How many hours of daylight does Sioux Falls have in May?

In Sioux Falls, South Dakota, the average day length in May is 14h and 44min.

What time are sunrise and sunset in May in Sioux Falls?

In May, on the first day of the month, sunrise is at 6:19 am and sunset at 8:28 pm. On the last day of the month, in Sioux Falls, South Dakota, sunrise is at 5:49 am and sunset at 9:00 pm CDT.

How long on average sun shines in May in Sioux Falls?

In Sioux Falls, South Dakota, the average sunshine duration in May is 8.7h.

What is the UV index reading in May in Sioux Falls?

In Sioux Falls, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Sioux Falls, SD

Average temperature in May - Sioux Falls, SD
  • Average high temperature in May: 67.5°F

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).

  • Average low temperature in May: 50.4°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 in May
Sioux Falls, SD

Average pressure in May - Sioux Falls, SD
  • Average pressure in May: 29.92"Hg

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

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Average wind speed in May
Sioux Falls, SD

Average wind speed in May - Sioux Falls, SD
  • Average wind speed in May: 9.8mph

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 in May
Sioux Falls, SD

Average humidity in May - Sioux Falls, SD
  • Average humidity in May: 69%

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 in May
Sioux Falls, SD

Average rainfall in May - Sioux Falls, SD
  • Average rainfall in May: 2.83"

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 in May
Sioux Falls, SD

Average rainfall days in May - Sioux Falls, SD
  • Average rainfall days in May: 16.6 days

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 in May
Sioux Falls, SD

Average snowfall in May - Sioux Falls, SD
  • Average snowfall in May: 0.24"

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

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Average snowfall days in May
Sioux Falls, SD

Average snowfall days in May - Sioux Falls, SD
  • Average snowfall days in May: 0.3 days

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

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Average daylight in May /
Average sunshine in May
Sioux Falls, SD

Average daylight in May / Average sunshine in May - Sioux Falls, SD
  • Average daylight in May: 14h and 44min

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

  • Average sunshine in May: 8h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in May
Sioux Falls, SD

Average sunshine days in May - Sioux Falls, SD
  • Average sunshine days in May: 12.4 days

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 in May
Sioux Falls, SD

Average UV index in May - Sioux Falls, SD
  • Average UV index in May: 5

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

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Average cloud cover in May
Sioux Falls, SD

Average cloud cover in May - Sioux Falls, SD
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in May
Sioux Falls, SD

Average visibility in May - Sioux Falls, SD
  • Average visibility in May: 6mi

The 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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