Sioux Falls in August
7.9out of 10
Yes, a good time to go
Warm and comfortable: highs around 27°C. Frequent rain: about 9 rainy days.
27°CAvg high
16°CAvg low
9Rainy days (84 mm)
13:48 hDaylight
06:37Sunrise · 20:25 Sunset
Why this score
- Warm and comfortable: highs around 27°C
- Frequent rain: about 9 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in August varies a lot between years (±3.8 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -3°C | -12°C | 20 mm | 5 | – | – | 4.5 |
| February | 0°C | -10°C | 24 mm | 5 | – | – | 4.4 |
| March | 7°C | -4°C | 47 mm | 7 | – | – | 5.5 |
| April | 15°C | 3°C | 90 mm | 10 | – | – | 6.5 |
| May | 21°C | 10°C | 114 mm | 13 | – | – | 7.1 |
| June | 27°C | 16°C | 131 mm | 12 | – | – | 7.2 |
| July | 29°C | 18°C | 84 mm | 9 | – | – | 7.9 |
| August | 27°C | 16°C | 84 mm | 9 | – | – | 7.9 |
| September | 24°C | 12°C | 81 mm | 8 | – | – | 8.0 |
| October | 16°C | 4°C | 61 mm | 7 | – | – | 7.1 |
| November | 7°C | -3°C | 40 mm | 6 | – | – | 5.5 |
| December | -1°C | -9°C | 27 mm | 5 | – | – | 4.4 |
Frequently asked questions
How hot is Sioux Falls in August?
Daytime highs average 27°C and nights about 16°C.
When is the best time to visit Sioux Falls?
The best months are September, July, August.