Climate Insights for Charleston International Airport

The climate in Charleston International Airport is warm and mild. The average annual temperature is 20°C and approximately 1394mm 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 7°C.

Temperatures in Charleston International Airport vary considerably across the year, with a 24°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 7°C and an average of 11°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Charleston International Airport is a fairly wet location, receiving approximately 1394mm of precipitation annually, which averages out to around 116mm per month. The wettest month is September, averaging 187mm of rainfall. August and July also tend to see above-average precipitation. The driest month is March, with just 63mm. That's 124mm less than September, 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 relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

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 31°C, while the coldest stretch bottoms out in January near 7°C. Summer is next, beginning on June 21, 2026 — 6 days from now.

The best time to visit Charleston International Airport is during March, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 77mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to 7°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.