2025 Compare Climate & Weather:
Charleston, SC vs St. Petersburg, FL

Highlights

On average, there are 248 sunny days per year in St. Petersburg. Charleston averages 209 sunny days per year. The US average is 205 sunny days.

St. Petersburg, Florida gets 50.7 inches of rain, on average, per year. Charleston, South Carolina gets 48.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

St. Petersburg averages 0 inches of snow per year. Charleston averages 0.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

St. Petersburg, Florida
Summer High: the July high is around 90.4 degrees
Winter Low: the January low is 52.5
Rain: averages 50.7 inches of rain a year
Snow: averages 0 inches of snow a year

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

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for St. Petersburg is 6.7 (10=best), which means it is less comfortable than most places in Florida.

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

Today's Weather - Charleston, SC

72°F

Today's Weather - St. Petersburg, FL

84°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Charleston / St. Petersburg

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.

August is the hottest month for St. Petersburg with an average high temperature of 90.4°, which ranks it as cooler than most places in Florida. In St. Petersburg, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Petersburg are November, March and April.

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

January has the coldest nighttime temperatures for St. Petersburg with an average of 52.5°. This is warmer than most places in Florida.

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 St. Petersburg, there are 73.1 days annually when the high temperature is over 90°, which is about average compared to other places in Florida.

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 St. Petersburg, there are 0.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Florida.

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.

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

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.


August is the wettest month in St. Petersburg with 8.2 inches of rain, and the driest month is November with 1.8 inches. The wettest season is Autumn with 45% of yearly precipitation and 16% occurs in Summer, which is the driest season. The annual rainfall of 50.7 inches in St. Petersburg means that it is drier than most places in Florida.

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.

August is the rainiest month in St. Petersburg with 15.4 days of rain, and April is the driest month with only 4.8 rainy days. There are 101.8 rainy days annually in St. Petersburg, which is one of the least rainy places in Florida. The rainiest season is Autumn when it rains 42% of the time and the driest is Summer with only a 16% chance of a rainy day.

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

There is rarely any recorded snowfall in St. Petersburg, ranking it as one of the least snowy places in Florida.

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

Any measurable snowfall is a rare occurance in St. Petersburg.