Charleston weather in May 2025

Expect 81°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Charleston in May. Check more long-term weather averages for Charleston in May before you book your next holiday to South Carolina in 2025/2026.

  • 81°F maximum daytime temperature in May in Charleston81
    81°F max day temperature
  • 9 hours of sunshine per day
  • 9 days with some rainfall in May in Charleston9
    9 days with some rainfall
  • 66°F minimum night-time temperature in May in Charleston66
    66°F min night temperature
  • 14 hours of daylight per day in May in Charleston14
    14 hours of daylight per day
  • Moderate heat & humidity in May in CharlestonM
    Moderate heat & humidity
  • 3.7 inches monthly rainfall in May in Charleston3.7
    3.7 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in Charleston9
    9 (Very High) UV index
  • 72°F sea temperature in May in Charleston72
    72°F sea temperature

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The May 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)  |  Imperial (°F)

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How hot is it in Charleston in May?

Daytime temperatures usually reach 81°F in Charleston in May with moderate heat and humidity, falling to 66°F at night.

How sunny is it in Charleston in May?

There are normally 9 hours of bright sunshine each day in Charleston in May - that's 68% of daylight hours.

How warm is the sea around Charleston in May?

The average sea temperature around Charleston in May is 72°F.

Does it rain in Charleston in May?

There are usually 9 days with some rain in Charleston in May and the average monthly rainfall is 3.7 inches.

Charleston May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:32 19:02
Friday, 16th May 2025 05:20 19:13
Saturday, 31st May 2025 05:13 19:23

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