Cornwall Weather Forecast

    • 5
    • 19

    Windy. Partly cloudy

    • 11
    • 22

    Windy. Sunny

    • 7
    • 23

    Becoming windy. Sunny

    • 7
    • 14

    Mostly sunny

    • 3
    • 16

    Partly cloudy

    • 4
    • 18

    Partly cloudy

    • 7
    • 18

    Shower or two

Today 18 Sep East Coast

Mostly sunny day. Slight chance of a shower in the evening. Damaging winds possible. Winds west to northwesterly 30 to 45 km/h. Daytime maximum temperatures between 15 and 20.

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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Cornwall Temperature Statistics View More

September Temperature

St Helens Aerodrome (27km)

  • Lowest 17 September, 2026

    2.2 °C

  • Average September

    11.7 °C

  • Highest 10 September, 2026

    22.2 °C

Climate (2021–2026)

St Helens Aerodrome (27km)

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  • Average Low 2021–2026

    9.4 °C

  • Average 2021–2026

    13.4 °C

  • Average High 2021–2026

    18.3 °C
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