Weather in Charleston County, United States in September

So you're interested in going to Charleston County, United States in September

September is a hot and slightly rainy time for sunbathing in Charleston County. September is an excellent month for swimming in Charleston County with very warm sea temperatures. Consider visiting Charleston County in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for September.

Temperature in Charleston County in September

The average maximum temperature in Charleston County in September is 29°. The average maximum temperature is 32° in the previous month and 25° in the next month.

The average temperature in Charleston County in September is 25°. The average temperature ranges is 28° in the previous month and 20° in the next month.

The average minimum temperature in Charleston County in September is 21°. The minimum temperature is 24° in the previous month and 15° in the next month.

Sunshine in Charleston County in September

The average day light hours per day in Charleston County in September are 12.4 and there are 8.3 hours of sunshine per day on average during September making it a sunny month with few clouds.

The ultraviolet index in Charleston County in September is typically 8.7 during September. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Charleston County in September

The average sea water temperature in Charleston County in September is 27.2° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Charleston County in September

The average total rainfall in Charleston County in September is 39cm and on average there are 9.6 rainy days in September making it a slightly wet time to visit the beach.

Humidity in Charleston County in September

The maximum dew point (an indicator of humidity) in Charleston County in September is 22° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan. The dew point is 25° in the previous month and 18° in the next month.

The average maximum relative humidity in Charleston County in September is typically 93.9%. The maximum relative humidity is 94.6% in the previous month and 93.7% in the next month.

The average relative humidity in Charleston County in September is typically 78.6%. The average relative humidity is 79.5% in the previous month and 75.2% in the next month.

Wind Speed in Charleston County in September

The average maximum wind speed in Charleston County in September is typically 22kmh. The average maximum wind speed is 22kmh in the previous month and 22kmh in the next month.

The average wind speed in Charleston County in September is typically 9kmh. The average wind speed is 8kmh in the previous month and 9kmh in the next month.

The average wind direction in Charleston County in September is from the East-Northeast.

Monthly Averages

Suggested Beaches in September

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