Charleston weather in July
July in Charleston: sweltering, soaked, with very humid — a fair time to visit.
#12 of 12 months in Charleston · #509 of 604 destinations to visit in July · comfort 56/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Charleston climate normals — July
| Daytime high | 30°C / 87°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 177 mm / 7 in | ⛈ soaked |
| Rainy days | 20 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 14.1 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Charleston in July — FAQ
- Is July a good time to visit Charleston?
- July in Charleston: sweltering, soaked, with very humid — a fair time to visit. It ranks #12 of 12 months for Charleston on SeasonMap's comfort score (56/100).
- What is the weather like in Charleston in July?
- In July, Charleston averages a daily high of 30.3°C and a low of 25.2°C, with about 176.9 mm of rain over roughly 20 rainy days.
- What is the air quality in Charleston in July?
- Charleston has a mean US Air Quality Index of about 65 in July.