Climate Insights for Charleston International Airport

The climate in Charleston International Airport is warm and mild. The average annual temperature is 19°C and approximately 1323mm of precipitation falls per year. Charleston International Airport receives a notable amount of rainfall throughout the year, including during its driest month. Charleston International Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to 5°C.

Temperatures in Charleston International Airport vary considerably across the year, with a 27°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 5°C and an average of 10°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Charleston International Airport is a fairly wet location, receiving approximately 1323mm of precipitation annually, which averages out to around 110mm per month. The wettest month is August, averaging 172mm of rainfall. July and September also tend to see above-average precipitation. The driest month is November, with just 68mm. That's 103mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Charleston International Airport is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 16km/h in winter, 17km/h in spring, 14km/h in summer, 15km/h in autumn.

It is currently spring in Charleston International Airport, which began on March 20, 2026. Charleston International Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 32°C, while the coldest stretch bottoms out in January near 5°C. Summer is next, beginning on June 21, 2026 — 92 days from now.

The best time to visit Charleston International Airport is during March, April, May and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 90mm per month. By contrast, July can be uncomfortably hot with highs reaching 32°C, while January is the coldest period with lows dropping to 5°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Charleston International Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.