Duncan (SC) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Duncan.
Climate overview of Duncan
Duncan, South Carolina, United States of America, sees big temperature differences between seasons, with July peaking at 32°C (90°F) and January dropping to 11°C (52°F).
Rain/snowfall is high, totalling around 1220 mm (48 in) per year. December is the wettest month and February the driest. The city also experiences very warm summers and cold winters.
Duncan Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Duncan - and find the best time to visit.
Monthly Temperature in Duncan
Visitors to Duncan can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 32°C (90°F) in July, the warmest time of the year, to a chilly 11°C (52°F) during cooler months like January.
At night, you can expect temperatures ranging from 21°C (70°F) in July to around -1°C (30°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Duncan
Duncan is known for its substantial rain/snowfall, with annual precipitation reaching 1220 mm (48 in). While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 141 mm (5.6 in) of precipitation, spread over 12 rainy days.
In contrast, the driest month February experiences a drier climate, with about 77 mm (3 in) of rainfall spread across 9 rainy days. For more details, please visit our Duncan Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Duncan
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, September and October
- Warmest weather: June, July and August
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Duncan
What is the best time to visit Duncan?
April, September and October typically offer the most optimal weather in Duncan. In contrast, January, February, July, August and December tend to have less optimal conditions. Duncan has very warm summers and cold winters.
What temperatures can I expect in Duncan?
Daytime highs range from 11°C (52°F) in January to 32°C (90°F) in July. Nighttime lows range from -1°C (30°F) to 21°C (70°F). Temperatures vary considerably through the year.
How much rain does Duncan get?
Annual rainfall is around 1220 mm (48 in). December is the wettest month with 141 mm (5.6 in), while February is the driest with 77 mm (3 in).
Duncan 3-Day Forecast
Duncan (SC) 3-Day Forecast
Duncan on the map
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