2025 Compare Climate & Weather:
Seneca, SC vs Charleston, SC

Highlights

On average, there are 209 sunny days per year in Charleston. Seneca averages 220 sunny days per year. The US average is 205 sunny days.

Charleston, South Carolina gets 48.3 inches of rain, on average, per year. Seneca, South Carolina gets 53.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Charleston averages 0.4 inches of snow per year. Seneca averages 2.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Charleston, South Carolina
Summer High: the July high is around 89.9 degrees
Winter Low: the January low is 39.3
Rain: averages 48.3 inches of rain a year
Snow: averages 0.4 inches of snow a year

Seneca, South Carolina
Summer High: the July high is around 90.2 degrees
Winter Low: the January low is 31.1
Rain: averages 53.4 inches of rain a year
Snow: averages 2.3 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Charleston is 7.2 (10=best), which means it is less comfortable than most places in South Carolina.

The annual BestPlaces Comfort Index for Seneca is 7.5 (10=best), which means it is one of the most pleasant places in South Carolina.

Today's Weather - Seneca, SC

62°F

Today's Weather - Charleston, SC

70°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Seneca / Charleston

July is the hottest month for Seneca with an average high temperature of 90.2°, which ranks it as cooler than most places in South Carolina. In Seneca, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Seneca are May, September and October.

July is the hottest month for Charleston with an average high temperature of 89.9°, which ranks it as cooler than most places in South Carolina. In Charleston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Charleston are October, May and April.

January has the coldest nighttime temperatures for Seneca with an average of 31.1°. This is colder than most places in South Carolina.

January has the coldest nighttime temperatures for Charleston with an average of 39.3°. This is one of the warmest places in South Carolina.

In Seneca, there are 44.5 days annually when the high temperature is over 90°, which is cooler than most places in South Carolina.

In Charleston, there are 41.1 days annually when the high temperature is over 90°, which is cooler than most places in South Carolina.

In Seneca, there are 58.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in South Carolina.

In Charleston, there are 17.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Carolina.

In Seneca, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Carolina.

In Charleston, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Carolina.

August is the wettest month in Seneca with 5.0 inches of rain, and the driest month is April with 3.7 inches. The wettest season is Spring with 27% of yearly precipitation and 23% occurs in Winter, which is the driest season. The annual rainfall of 53.4 inches in Seneca means that it is one of the wettest places in South Carolina.


August is the wettest month in Charleston with 6.7 inches of rain, and the driest month is May with 2.5 inches. The wettest season is Autumn with 36% of yearly precipitation and 19% occurs in Summer, which is the driest season. The annual rainfall of 48.3 inches in Charleston means that it is wetter than most places in South Carolina.

July is the rainiest month in Seneca with 10.5 days of rain, and October is the driest month with only 7.2 rainy days. There are 111.0 rainy days annually in Seneca, which is one of the rainiest places in South Carolina. The rainiest season is Autumn when it rains 27% of the time and the driest is Winter with only a 22% chance of a rainy day.

August is the rainiest month in Charleston with 11.7 days of rain, and May is the driest month with only 6.8 rainy days. There are 105.9 rainy days annually in Charleston, which is rainier than most places in South Carolina. The rainiest season is Autumn when it rains 32% of the time and the driest is Summer with only a 21% chance of a rainy day.

An annual snowfall of 2.3 inches in Seneca means that it is snowier than most places in South Carolina.

An annual snowfall of 0.4 inches in Charleston means that it is less snowy than most places in South Carolina.

January is the snowiest month in Seneca with 1.1 inches of snow, and 2 months of the year have significant snowfall.

December is the snowiest month in Charleston with 0.2 inches of snow, and no months of the year have significant snowfall.