Watford weather in September 2026

Expect daytime maximum temperatures of 19°C in Watford, England in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 12 days with some rainfall and typically 55 mm of rainfall in the month.

  • 19°C maximum daytime temperature in September in Watford19
    19°C max day temperature
  • 5 hours of sunshine per day
  • 12 days with some rainfall in September in Watford12
    12 days with some rainfall
  • 10°C minimum night-time temperature in September in Watford10
    10°C min night temperature
  • 13 hours of daylight per day in September in Watford13
    13 hours of daylight per day
  • No heat & humidity in September in Watford0
    No heat & humidity
  • 55 mm monthly rainfall in September in Watford55
    55 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Watford4
    4 (Moderate) UV index

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The September weather guide for England (Watford) 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 Watford in September?

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

How sunny is it in Watford in September?

There are normally 5 hours of bright sunshine each day in Watford in September - that's 37% of daylight hours.

Does it rain in Watford in September?

There are usually 12 days with some rain in Watford in September and the average monthly rainfall is 55mm.

Watford September sunrise & sunset times

Browse the sunrise and sunset times for Watford in September 2026. Select a month to view Watford sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:14 18:48
Tuesday, 15th September 2026 05:36 18:16
Wednesday, 30th September 2026 06:00 17:42

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