Cornwall Weather Forecast

    • 8
    • 16

    Showers increasing

    • 5
    • 12

    Cloudy

    • 5
    • 16

    Possible shower

    • 4
    • 12

    Shower or two

    • 1
    • 16

    Morning frost. Partly cloudy

    • 6
    • 17

    Partly cloudy

    • 5
    • 15

    Shower or two

Today 19 Sep East Coast

Partly cloudy. High chance of showers, most likely this evening. The chance of a thunderstorm in the south during this afternoon and evening. Winds northwesterly 25 to 35 km/h. Daytime maximum temperatures between 12 and 17.

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Cornwall Temperature Statistics View More

September Temperature

St Helens Aerodrome (27km)

  • Lowest 5 September, 2025

    1 °C

  • Average September

    11.1 °C

  • Highest 15 September, 2025

    20.8 °C

Climate (2020–Present)

St Helens Aerodrome (27km)

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  • Average Low 2020–2025

    9.4 °C

  • Average 2020–2025

    13.3 °C

  • Average High 2020–2025

    18.2 °C
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