Climate averages 1991–2020
Sioux Falls weather
in May.
A mild, wet month: the 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Sioux Falls: daytime highs average 19.9°C and nights cool to about 9.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 114 mm of rain on roughly 13 days, which makes May a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 41 min on an average May day.
The nearest other city in this atlas is Sioux City (119 km away). In May its highs average 21.0°C, 1.1°C warmer than Sioux Falls, with 126 mm of rain.
Among the 498 cities listed in the United States, Sioux Falls ranks joint 384th of 498 for the warmest May highs and joint 422nd of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Sioux Falls is 3.9°C cooler than that mean.
From May to June, average highs rise by 5.3°C to 25.2°C, and monthly rainfall rises from 114 mm to 130 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sioux Falls climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.5°C-12.8°C | -12.8°C | 20 | 4.7 | 9.39 h |
| February | -0.5°C-10.4°C | -10.4°C | 24 | 4.9 | 10.510 h |
| March | 6.6°C-4.2°C | -4.2°C | 46 | 6.6 | 11.912 h |
| April | 13.6°C2.6°C | 2.6°C | 91 | 10.3 | 13.413 h |
| May, selected | 19.9°C9.5°C | 9.5°C | 114 | 12.5 | 14.715 h |
| June | 25.2°C15.4°C | 15.4°C | 130 | 12.5 | 15.415 h |
| July | 27.7°C18.2°C | 18.2°C | 84 | 8.9 | 15.115 h |
| August | 26.6°C17.1°C | 17.1°C | 85 | 8.8 | 14.014 h |
| September | 22.6°C12.8°C | 12.8°C | 80 | 7.9 | 12.613 h |
| October | 14.7°C5.3°C | 5.3°C | 61 | 7.0 | 11.111 h |
| November | 6.0°C-2.7°C | -2.7°C | 40 | 5.5 | 9.710 h |
| December | -1.3°C-9.5°C | -9.5°C | 27 | 5.0 | 9.09 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Sioux City in MayUnited States · 119 kmHigh 21.0°C · Low 10.6°C · 126 mm rain
- Omaha in MayUnited States · 262 kmHigh 22.0°C · Low 11.9°C · 139 mm rain
- Lincoln in MayUnited States · 305 kmHigh 22.6°C · Low 12.2°C · 130 mm rain
- Plymouth, United States in MayUnited States · 307 kmHigh 19.2°C · Low 9.6°C · 108 mm rain
- Bloomington (Minnesota), United States in MayUnited States · 309 kmHigh 19.6°C · Low 10.2°C · 113 mm rain
- Minneapolis in MayUnited States · 319 kmHigh 19.5°C · Low 9.7°C · 110 mm rain
- Brooklyn Park in MayUnited States · 319 kmHigh 19.4°C · Low 9.6°C · 110 mm rain
- Saint Paul in MayUnited States · 329 kmHigh 19.5°C · Low 9.9°C · 110 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sioux Falls) is explained once on the Sioux Falls year overview and on the Sources, method and limits page.