Union (SC) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Union.
Climate overview of Union
The climate in Union, South Carolina, United States of America, is marked by large temperature swings across the seasons, ranging from 33°C (91°F) in July to 12°C (54°F) in January.
The city receives considerable rain/snowfall, with around 1083 mm (43 in) annually. December is the wettest month. It has very warm summers and cold winters.
Union Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Union - and find the best time to visit.
Monthly Temperature in Union
In Union, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 33°C (91°F) in July to a chilly 12°C (54°F) in the coolest month, January.
Nights vary from 21°C (70°F) in July to around -1°C (30°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Union
Union experiences significant rain/snowfall throughout the year, averaging 1083 mm (43 in) of precipitation annually. Union offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month December (131 mm (5.2 in)) and the driest month February (72 mm (2.8 in)) is not too significant. For more details, please visit our Union 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 Union
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, September and October
- Warmest weather: June, July and August
- Fewest rainy days: February, September, October and November
- 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 Union
What is the best time to visit Union?
April, May, September and October typically offer the most optimal weather in Union. In contrast, January, July, August and December tend to have less optimal conditions. Union has very warm summers and cold winters.
What temperatures can I expect in Union?
Daytime highs range from 12°C (54°F) in January to 33°C (91°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 Union get?
Annual rainfall is around 1083 mm (43 in). December is the wettest month with 131 mm (5.2 in), while February is the driest with 72 mm (2.8 in).
Union 3-Day Forecast
Union on the map
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