Click on a day for an hourly weather forecast
The temperatures in South Dakota in October are quite cold with temperatures between 5°C and 14°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in South Dakota during the month of October. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that South Dakota can expect a few days of snow in October.
Our weather forecast can give you a great sense of what weather to expect in South Dakota in October 2025.
If you’re planning to visit South Dakota in the near future, we highly recommend that you review the 14 day weather forecast for South Dakota before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -5° / -13° | 2 | 15 | 13 | 35 mm | Awful | South Dakota in January |
| February | -4° / -12° | 2 | 15 | 11 | 39 mm | Awful | South Dakota in February |
| March | 6° / -2° | 5 | 17 | 9 | 67 mm | Awful | South Dakota in March |
| April | 13° / 3° | 6 | 20 | 4 | 110 mm | Bad | South Dakota in April |
| May | 20° / 10° | 9 | 22 | 0 | 135 mm | Ok | South Dakota in May |
| June | 25° / 16° | 8 | 22 | 0 | 185 mm | Good | South Dakota in June |
| July | 28° / 17° | 6 | 25 | 0 | 109 mm | Perfect | South Dakota in July |
| August | 28° / 15° | 6 | 25 | 0 | 118 mm | Perfect | South Dakota in August |
| September | 24° / 12° | 5 | 25 | 0 | 94 mm | Perfect | South Dakota in September |
| October | 14° / 5° | 4 | 25 | 2 | 83 mm | Ok | South Dakota in October |
| November | 7° / -1° | 2 | 23 | 5 | 33 mm | Bad | South Dakota in November |
| December | -2° / -9° | 3 | 16 | 12 | 43 mm | Awful | South Dakota in December |