Sioux Falls Climate by Month
Sioux Falls, South Dakota, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Sioux Falls's climate in short. Afternoon highs range from 27°F (-3°C) in January to 85°F (30°C) in July, and January nights average 7°F (-14°C). About 25 in (633 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 7°F(-14°C)
- Average low, January
- Rain per year
- 25 in(633 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Sioux Falls
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (24°C) and about 3.1 in (79 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 27°F (-3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Sioux Falls weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 27°F(-3°C) | 7°F(-14°C) | 0.5 in(13 mm) | 93% | 1.5 |
| FebFebruary | 32°F(0°C) | 12°F(-11°C) | 0.7 in(18 mm) | 74% | 2.4 |
| MarMarch | 45°F(7°C) | 24°F(-5°C) | 1.3 in(34 mm) | 75% | 3.7 |
| AprApril | 58°F(15°C) | 35°F(2°C) | 2.6 in(67 mm) | 64% | 4.8 |
| MayMay | 71°F(22°C) | 47°F(8°C) | 3.5 in(88 mm) | 65% | 5.3 |
| JunJune | 81°F(27°C) | 58°F(14°C) | 4.0 in(101 mm) | 66% | 6.0 |
| JulJuly | 85°F(30°C) | 63°F(17°C) | 2.8 in(71 mm) | 69% | 6.4 |
| AugAugust | 83°F(28°C) | 60°F(16°C) | 2.8 in(72 mm) | 72% | 5.5 |
| SepSeptemberBest | 76°F(24°C) | 51°F(10°C) | 3.1 in(79 mm) | 66% | 4.4 |
| OctOctober | 61°F(16°C) | 37°F(3°C) | 1.8 in(46 mm) | 68% | 2.8 |
| NovNovember | 44°F(7°C) | 23°F(-5°C) | 0.9 in(24 mm) | 77% | 1.8 |
| DecDecember | 31°F(-1°C) | 12°F(-11°C) | 0.8 in(20 mm) | 76% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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