Ystradgynlais Weather Forecast

    • 8
    • 13

    Cloudy

    • 10
    • 12

    Heavy rain

    • 11
    • 13

    Light rain

    • 12
    • 14

    Light rain

    • 12
    • 18

    Light rain

    • 12
    • 18

    Cloudy

    • 12
    • 17

    Cloudy

Today 17 May Wales

A bright start but cloud will quickly bubble up allowing a few showers to develop by lunchtime. Showers then becoming increasingly frequent and heavier later in the day. Feeling a little less cool but temperatures still below average. Maximum temperature 15 °C.

Tonight 17 May Wales

Scattered showers continuing overnight with some clearer spells in between. Showers perhaps becoming more organised and heavier later during the early hours. Turning chilly in the countryside but mainly frost-free. Minimum temperature 6 °C.

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Ystradgynlais Temperature Statistics

May Temperature

Sennybridge (32km)

  • Lowest 11 May, 2026

    -1 °C

  • Average May

    8.7 °C

  • Highest 9 May, 2026

    16.6 °C

Climate (2021–Present)

Sennybridge (32km)

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  • Average Low 2021–2026

    5.7 °C

  • Average 2021–2026

    9.3 °C

  • Average High 2021–2026

    12.8 °C
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