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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Recommended for South Carolina

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

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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