Click on a day for an hourly weather forecast
The weather in Sumter in August is hot. The average temperatures are between 22°C and 32°C.
You can expect rain for roughly half of the month of August in Sumter. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Sumter in August 2025.
If you’re planning to visit Sumter in the near future, we highly recommend that you review the 14 day weather forecast for Sumter before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 12° / 4° | 5 | 25 | 1 | 96 mm | Ok | Sumter in January |
| February | 14° / 5° | 6 | 22 | 1 | 116 mm | Good | Sumter in February |
| March | 18° / 9° | 6 | 25 | 0 | 110 mm | Good | Sumter in March |
| April | 23° / 13° | 6 | 25 | 0 | 124 mm | Perfect | Sumter in April |
| May | 27° / 17° | 8 | 23 | 0 | 165 mm | Good | Sumter in May |
| June | 31° / 21° | 7 | 23 | 0 | 145 mm | Ok | Sumter in June |
| July | 33° / 23° | 9 | 22 | 0 | 169 mm | Ok | Sumter in July |
| August | 32° / 22° | 8 | 23 | 0 | 168 mm | Ok | Sumter in August |
| September | 29° / 19° | 6 | 24 | 0 | 135 mm | Good | Sumter in September |
| October | 24° / 14° | 3 | 28 | 0 | 103 mm | Perfect | Sumter in October |
| November | 17° / 9° | 3 | 26 | 0 | 73 mm | Good | Sumter in November |
| December | 14° / 6° | 6 | 25 | 0 | 135 mm | Good | Sumter in December |