Hilton Head Island weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Hilton Head Island in September. Check more long-term weather averages for Hilton Head Island in September before you book your next holiday to South Carolina in 2025/2026.

  • 29°C maximum daytime temperature in September in Hilton Head Island29
    29°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Hilton Head Island10
    10 days with some rainfall
  • 21°C minimum night-time temperature in September in Hilton Head Island21
    21°C min night temperature
  • 12 hours of daylight per day in September in Hilton Head Island12
    12 hours of daylight per day
  • High heat & humidity in September in Hilton Head IslandH
    High heat & humidity
  • 134 mm monthly rainfall in September in Hilton Head Island134
    134 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Hilton Head Island8
    8 (Very High) UV index
  • 27°C sea temperature in September in Hilton Head Island27
    27°C sea temperature

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The September weather guide for South Carolina (Hilton Head Island) 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 Hilton Head Island in September?

Daytime temperatures usually reach 29°C in Hilton Head Island in September with high heat and humidity, falling to 21°C at night.

How sunny is it in Hilton Head Island in September?

There are normally 7 hours of bright sunshine each day in Hilton Head Island in September - that's 58% of daylight hours.

How warm is the sea around Hilton Head Island in September?

The average sea temperature around Hilton Head Island in September is 27°C.

Does it rain in Hilton Head Island in September?

There are usually 10 days with some rain in Hilton Head Island in September and the average monthly rainfall is 134mm.

What is the chance of a hurricane in Hilton Head Island in September?

On average 1.3 days in September in Hilton Head Island are likely to be affected by the passage of one or more tropical storms.

Hilton Head Island September sunrise & sunset times

Browse the sunrise and sunset times for Hilton Head Island in September 2025. Select a month to view Hilton Head Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:58 18:47
Monday, 15th September 2025 06:07 18:29
Tuesday, 30th September 2025 06:16 18:09

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