Weather in Charleston in August 2025
- August is usually the hottest month of the year in Charleston;
- August is usually the wettest month of the year in Charleston;
Average weather
Average temperature in Charleston in August
Going from a maximum of +95°F during the day to a minimum of +72°F during the night, the temperature in August averages around +90°F.
The average maximum temperature goes down 8% by the end of the month, compared with the beginning of the month, from +88°F to +86°F.
Is Charleston warm or cold in August?
Charleston is typically hot in August.
Maximum temperatures go up compared to the previous month from +88°F to +88°F. The minimum temperature also goes down from +77°F to +75°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
August is the hottest month in Charleston, here is the comparison with other months:
Climate in Charleston in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +88°F | +88°F | +82°F | ||||
| Min. temperature | ||||||
| +64°F | +61°F | +54°F | ||||
| Max. temperature | ||||||
| +99°F | +100°F | +97°F | ||||
| Rainfall | ||||||
| 151 mm | 179 mm | 140 mm | ||||
| Wind | ||||||
| 3 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 80% | 82% | 81% | ||||
| Air pressure | ||||||
| 1016 HPa | 1015 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 3 | 3 | 6 | ||||
| Cloudy days | ||||||
| 4 | 3 | 5 | ||||
| Rainy days | ||||||
| 22 | 23 | 19 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. The temperature levels stay the same in the area of +88°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 151 mm to 179 mm. Humidity rises from 80% to 82%. Winds are calmer in comparison to July, going down from 3 m/s to 2 m/s on average. The amount of sunny days stay about the same, averaging 3 sunny days during the month.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Charleston is gradually increasing during August, going from 3 m/s to 6 m/s over the course of the month.
Rain
How was the weather last August in Charleston?
Climate Change Over the Years
The climate in Charleston in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1988 (+72°F) and the highest in 2012 (+77°F). The driest year was 2011 with only 770 mm of rainfall, and the wettest year was 2024 with 2044 mm.
FAQ
Is August a good time to visit Charleston?
Can you sunbathe in Charleston in August?
Is Charleston rainy in August?
Is it sunny in Charleston in August?
Other cities in USA
Monthly weather in Charleston
Source of the data
For this page, we’ve looked at the typical weather in Charleston, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
