Scilly Isles weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Scilly Isles in September. Check more long-term weather averages for Scilly Isles in September before you book your next holiday to England in 2025/2026.

  • 17°C maximum daytime temperature in September in Scilly Isles17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Scilly Isles15
    15 days with some rainfall
  • 11°C minimum night-time temperature in September in Scilly Isles11
    11°C min night temperature
  • 13 hours of daylight per day in September in Scilly Isles13
    13 hours of daylight per day
  • No heat & humidity in September in Scilly Isles0
    No heat & humidity
  • 89 mm monthly rainfall in September in Scilly Isles89
    89 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Scilly Isles4
    4 (Moderate) UV index
  • 16°C sea temperature in September in Scilly Isles16
    16°C sea temperature

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The September weather guide for England (Scilly Isles) 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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More about England

How warm is it in Scilly Isles in September?

Daytime temperatures usually reach 17°C in Scilly Isles in September, falling to 11°C at night.

How sunny is it in Scilly Isles in September?

There are normally 5 hours of bright sunshine each day in Scilly Isles in September - that's 41% of daylight hours.

How warm is the sea around Scilly Isles in September?

The average sea temperature around Scilly Isles in September is 16°C.

Does it rain in Scilly Isles in September?

There are usually 15 days with some rain in Scilly Isles in September and the average monthly rainfall is 89mm.

Scilly Isles September sunrise & sunset times

Browse the sunrise and sunset times for Scilly Isles in September 2025. Select a month to view Scilly Isles sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:41 19:09
Monday, 15th September 2025 06:01 18:38
Tuesday, 30th September 2025 06:24 18:05

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