Harwich weather in September 2025

Expect 19°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Harwich in September. Check more long-term weather averages for Harwich in September before you book your next holiday to England in 2025/2026.

  • 19°C maximum daytime temperature in September in Harwich19
    19°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Harwich15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Harwich10
    10°C min night temperature
  • 13 hours of daylight per day in September in Harwich13
    13 hours of daylight per day
  • No heat & humidity in September in Harwich0
    No heat & humidity
  • 48 mm monthly rainfall in September in Harwich48
    48 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Harwich4
    4 (Moderate) UV index
  • 17°C sea temperature in September in Harwich17
    17°C sea temperature

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The September weather guide for England (Harwich) 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 hot is it in Harwich in September?

Daytime temperatures usually reach 19°C in Harwich in September, falling to 10°C at night.

How sunny is it in Harwich in September?

There are normally 5 hours of bright sunshine each day in Harwich in September - that's 40% of daylight hours.

How warm is the sea around Harwich in September?

The average sea temperature around Harwich in September is 17°C.

Does it rain in Harwich in September?

There are usually 15 days with some rain in Harwich in September and the average monthly rainfall is 48mm.

Harwich September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:07 18:42
Monday, 15th September 2025 05:30 18:09
Tuesday, 30th September 2025 05:54 17:34

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