Sumter Climate by Month
Sumter, South Carolina, United States
Hot summers and cool winters, with rain spread through the year.
Sumter has hot summers and cool winters, with rain spread through the year. July is the warmest month, with highs around 93°F (34°C); January is the coolest at 57°F (14°C), and nights dip to 35°F (2°C). It gets 47 in (1182 mm) of rain a year, spread across the months.
- Warmest month
- 93°F(34°C)
- Average high, July
- Coldest nights
- 35°F(2°C)
- Average low, January
- Rain per year
- 47 in(1182 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: May
Best and worst months in Sumter
Best for weatherThe most comfortable weather comes in April and October, with highs around 77°F (25°C) and about 3.4 in (86 mm) of rain a month.
Least pleasantJanuary and July are the least pleasant; July is the hottest, with highs of 93°F (34°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 October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Sumter weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 35°F(2°C) | 3.9 in(100 mm) | 67% | 2.6 |
| FebFebruary | 61°F(16°C) | 37°F(3°C) | 3.3 in(84 mm) | 59% | 3.2 |
| MarMarch | 69°F(21°C) | 43°F(6°C) | 3.6 in(92 mm) | 59% | 4.3 |
| AprAprilBest | 77°F(25°C) | 51°F(10°C) | 3.5 in(88 mm) | 59% | 5.4 |
| MayMay | 85°F(29°C) | 59°F(15°C) | 3.3 in(84 mm) | 64% | 6.1 |
| JunJune | 90°F(32°C) | 67°F(19°C) | 5.1 in(130 mm) | 69% | 6.0 |
| JulJuly | 93°F(34°C) | 70°F(21°C) | 5.0 in(126 mm) | 68% | 6.0 |
| AugAugust | 91°F(33°C) | 69°F(21°C) | 4.8 in(123 mm) | 71% | 5.4 |
| SepSeptember | 86°F(30°C) | 64°F(18°C) | 4.1 in(104 mm) | 71% | 4.5 |
| OctOctoberBest | 77°F(25°C) | 52°F(11°C) | 3.3 in(84 mm) | 67% | 3.6 |
| NovNovember | 67°F(20°C) | 42°F(5°C) | 3.0 in(76 mm) | 69% | 2.8 |
| DecDecember | 60°F(15°C) | 36°F(2°C) | 3.6 in(91 mm) | 70% | 2.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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