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Weather in Sioux Falls, South Dakota for May 2026

Your guide to Sioux Falls weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Sioux Falls at the beginning of May is 19.3 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 22.3 °F by the end of May.

    • Rain 🌧️

  • The climate of Sioux Falls in May is notably wet, with an average of 14 rainy days, and a total of 81 mm of precipitation.

    • More

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Average dry days
17
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/10°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
69 %
Avg humidity

Sioux Falls Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
19°
2
Patchy rain possible
15°
3
Overcast
18°
4
Patchy rain possible
19°
5
Sunny
21°
6
Light rain shower
23°
7
Thundery outbreaks possible
20°
8
Light rain shower
20°
9
Light rain shower
23°
10
Patchy light drizzle
25°
11
Partly cloudy
27°
12
Thundery outbreaks possible
28°
13
Patchy rain possible
26°
14
Sunny
26°
15
Light rain shower
21°
16
Mist
17°
17
Sunny
20°
18
Patchy light drizzle
19°
19
Light rain shower
16°
20
Sunny
15°
21
Sunny
16°
22
Cloudy
20°
23
Partly cloudy
21°
24
Sunny
19°
25
Patchy rain possible
21°
26
Partly cloudy
21°
27
Sunny
20°
28
Partly cloudy
21°
29
Moderate rain at times
22°
30
Heavy rain at times
25°
31
Moderate or heavy rain shower
26°

Temperatures trend during May in Sioux Falls

See the weather trend as well as the moving average line

May weather in Sioux Falls day by day

Click on a date for more information
April June
Date Weather Temperatures Rain Snow More
May 1 Patchy rain possible
Patchy rain possible
 19° /8° 0.1 mm 0 cm
May 2 Patchy rain possible
Patchy rain possible
 15° /6° 6.3 mm 0 cm
May 3 Overcast
Overcast
 18° /5° 2 mm 0 cm
May 4 Patchy rain possible
Patchy rain possible
 19° /6° 2.5 mm 0 cm
May 5 Sunny
Sunny
 21° /7° 0 mm 0 cm
May 6 Light rain shower
Light rain shower
 23° /9° 9.9 mm 0 cm
May 7 Thundery outbreaks possible
Thundery outbreaks possible
 20° /9° 0.1 mm 0 cm
May 8 Light rain shower
Light rain shower
 20° /7° 2.2 mm 0 cm
May 9 Light rain shower
Light rain shower
 23° /9° 1.8 mm 0 cm
May 10 Patchy light drizzle
Patchy light drizzle
 25° /10° 0.2 mm 0 cm
May 11 Partly cloudy
Partly cloudy
 27° /11° 0 mm 0 cm
May 12 Thundery outbreaks possible
Thundery outbreaks possible
 28° /13° 1.3 mm 0 cm
May 13 Patchy rain possible
Patchy rain possible
 26° /12° 0.7 mm 0 cm
May 14 Sunny
Sunny
 26° /12° 0 mm 0 cm
May 15 Light rain shower
Light rain shower
 21° /14° 34 mm 0 cm
May 16 Mist
Mist
 17° /7° 0 mm 0 cm
May 17 Sunny
Sunny
 20° /8° 0 mm 0 cm
May 18 Patchy light drizzle
Patchy light drizzle
 19° /8° 0.1 mm 0 cm
May 19 Light rain shower
Light rain shower
 16° /10° 14.9 mm 0 cm
May 20 Sunny
Sunny
 15° /3° 0 mm 0 cm
May 21 Sunny
Sunny
 16° /5° 12 mm 6.2 cm
May 22 Cloudy
Cloudy
 20° /9° 0.1 mm 0 cm
May 23 Partly cloudy
Partly cloudy
 21° /10° 11.9 mm 0 cm
May 24 Sunny
Sunny
 19° /11° 0.5 mm 0 cm
May 25 Patchy rain possible
Patchy rain possible
 21° /10° 0.3 mm 0 cm
May 26 Partly cloudy
Partly cloudy
 21° /11° 0 mm 0 cm
May 27 Sunny
Sunny
 20° /10° 5.2 mm 0 cm
May 28 Partly cloudy
Partly cloudy
 21° /9° 0.2 mm 0 cm
May 29 Moderate rain at times
Moderate rain at times
 22° /11° 0.7 mm 0 cm
May 30 Heavy rain at times
Heavy rain at times
 25° /14° 4.1 mm 0 cm
May 31 Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /15° 7.6 mm 0 cm
Next
Important Notice
Our weather forecast for Sioux Falls in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Sioux Falls forecast closer to your planned date for the most up-to-date weather information.
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Sioux Falls in May - FAQ

What are the expected maximum and minimum temperatures in Sioux Falls during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sioux Falls during May?
Moderate rainfall is anticipated in Sioux Falls during May, with a total of 81 mm spread over approximately 14 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Sioux Falls during May?
The average wind speed in Sioux Falls during May is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

Sioux Falls snow forecast May 2026

Track daily snowfall levels and discover Sioux Falls’s snowy potential this May ❄️

May rainfall patterns in Sioux Falls

Explore the daily rainfall trends and prepare for Sioux Fallss May weather 💧

UV exposure in Sioux Falls during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is Sioux Falls?

Get accurate weather forecasts for Sioux Falls, located at latitude 43.55 and longitude -96.7. Stay updated with localized weather information tailored for Sioux Falls.

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