Charleston weather in August 2025

Expect 31°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Charleston in August. Check more long-term weather averages for Charleston in August before you book your next holiday to South Carolina in 2025/2026.

  • 31°C maximum daytime temperature in August in Charleston31
    31°C max day temperature
  • 8 hours of sunshine per day
  • 13 days with some rainfall in August in Charleston13
    13 days with some rainfall
  • 24°C minimum night-time temperature in August in Charleston24
    24°C min night temperature
  • 13 hours of daylight per day in August in Charleston13
    13 hours of daylight per day
  • Very high heat & humidity in August in CharlestonVH
    Very High heat & humidity
  • 185 mm monthly rainfall in August in Charleston185
    185 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Charleston10
    10 (Very High) UV index
  • 28°C sea temperature in August in Charleston28
    28°C sea temperature

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The August weather guide for South Carolina (Charleston) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Charleston in August?

Daytime temperatures usually reach 31°C in Charleston in August with very high heat and humidity, falling to 24°C at night.

How sunny is it in Charleston in August?

There are normally 8 hours of bright sunshine each day in Charleston in August - that's 62% of daylight hours.

How warm is the sea around Charleston in August?

The average sea temperature around Charleston in August is 28°C.

Does it rain in Charleston in August?

There are usually 13 days with some rain in Charleston in August and the average monthly rainfall is 185mm.

What is the chance of a hurricane in Charleston in August?

On average 1 day in August in Charleston is likely to be affected by the passage of one or more tropical storms.

Charleston August sunrise & sunset times

Browse the sunrise and sunset times for Charleston in August 2025. Select a month to view Charleston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:34 19:18
Saturday, 16th August 2025 05:44 19:03
Sunday, 31st August 2025 05:54 18:45

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