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    • 10
    • 19

    Light rain

    • 15
    • 19

    Cloudy

    • 15
    • 21

    Cloudy

    • 11
    • 20

    Partly cloudy

    • 14
    • 21

    Sunny day

    • 13
    • 21

    Cloudy

Today 17 Sep London and South East England

Cloudy with light rain for many to start the day, this slowly clears away through the late morning to leave a partly cloudy and dry afternoon. Temperatures near average. Maximum temperature 21 °C.

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September Temperature

Heathrow (21km)

  • Lowest 9 September, 2026

    11.5 °C

  • Average September

    18.4 °C

  • Highest 6 September, 2026

    27.6 °C

Climate (2021–2026)

Heathrow (21km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    12.7 °C

  • Average High 2021–2026

    16.6 °C
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