15-Day Weather Forecast - Charleston
15-day weather forecast for Charleston: temperatures from 21°C (70°F) to 35°C (95°F). Average daily high 29°C (84°F) over the next 15 days.
Hourly Forecast by Day
15-Day Temperature Trend
15-Day Weather Forecast
Updated just nowWeather Insight
Charleston's 15-day outlook ranges from a low of 21°C to a high of 35°C, with an average daytime high near 29°C. That's 1° below the long-term average high of 30°C for this time of year. Air quality is currently Moderate (AQI 52), driven mainly by PM2.5 at 11 μg/m³.
Today vs Normal
The long-term average high for today is 30°C.
21 of the last 28 days with published data ran above normal.
That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.
Extended Outlook for Charleston
Over the next 15 days, Charleston is forecast to see temperatures ranging from 20°C to 36°C, averaging a daily high of 29°C. The extended outlook indicates significant rainfall totalling 167.8 mm spread across 13 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.