Weather in West Sussex in September

General weather information about West Sussex

Average annual temperature is 11.6 °C

Absolute maximum temperature: 29.9 °C

Absolute minimum temperature: -5.4 °C

Number of sunny days: 128 days

Number of rainy days: 237 days

Look at detailed online map of West Sussex

* Weather data for West Sussex United Kingdom is based on climate observations for 2026 year

West Sussex air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.712.913.618.020.828.326.124.329.922.415.013.9
Average daytime temperature (°C)8.29.59.912.817.222.720.320.622.316.710.910.2
Average temperature (°C)5.26.07.48.712.617.716.916.817.813.38.18.0
Average night temperature (°C)1.92.74.64.67.912.513.212.913.710.15.05.6
Absolute minimum temperature (°C)-5.4-3.6-2.6-0.35.17.79.38.88.12.1-1.5-3.0

West Sussex monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.016.016.016.015.013.011.09.08.0
Daylight mean duration (h)8.510.011.913.815.616.516.014.512.610.79.08.0
Daylight minimum duration (h)8.09.010.012.014.016.015.013.011.09.08.07.0
Sunshine mean duration (h)3.84.44.07.610.513.110.49.89.36.94.32.5
Precipitation (mm)10471338852311198464109104102
Sunny days14163111417461211119
Rainy days171228191713272518201922
Snow days000000000000

West Sussex - weather forecast by months

West Sussex weather in januaryWest Sussex weather in februaryWest Sussex weather in marchWest Sussex weather in aprilWest Sussex weather in mayWest Sussex weather in juneWest Sussex weather in julyWest Sussex weather in augustWest Sussex weather in septemberWest Sussex weather in octoberWest Sussex weather in novemberWest Sussex weather in december

Best time to visit West Sussex:

The best time to visit West Sussex during the most sunny months:

  • May — 10.5(h)
  • June — 13.1(h)
  • July — 10.4(h)
  • August — 9.8(h)
  • September — 9.3(h)

Months with the longest average daylight duration in West Sussex:

  • May — 15.6(h)
  • June — 16.5(h)
  • July — 16.0(h)

The largest precipitation sum in West Sussex is at

  • March — 133(mm)
  • July — 119(mm)
  • October — 109(mm)

    • Weather forecast in the closest to West Sussex admin centers

    Weather forecast in the closest towns to West Sussex

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    Frequently asked questions

    When is the best time to visit West Sussex?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit West Sussex.
    What is the weather like in West Sussex?
    See average temperature, rainfall and daylight hours for West Sussex by month in the table above.
    How many sunny days does West Sussex have?
    The monthly weather statistics above show sunshine and rainfall patterns for West Sussex throughout the year.