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    Home » M4 closure and rail delays as severe weather impacts Wales
    Weather

    M4 closure and rail delays as severe weather impacts Wales

    Rhys GregoryBy Rhys GregorySeptember 15, 2025Updated:September 16, 2025No Comments
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    Credit: Matthew Horwood
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    Signs are showing that the worst of the weather is beginning to ease across Wales, but a Met Office yellow warning for strong winds remains in place until this evening.

    The unsettled conditions have led to significant disruption on the roads and railways, with drivers and passengers urged to check before they travel.

    Roads

    A number of roads remain closed due to high winds. Traffic Wales confirmed this afternoon that one road is currently shut in both directions until further notice.

    Motorists are also being advised to prepare for further disruption, with an advance closure of the M4 Kenfig Viaduct between junction 37 (Pyle) and junction 38 (Margam) earlier today. The closure is due to high winds and will see traffic diverted via the A4229 and A48.

    Rail

    Transport for Wales has reported disruption between Wrexham Central and Bidston after a tree fell onto the line. Some services are blocked and delays are expected until at least 18:00.

    Replacement buses are in place to assist passengers. Buses are expected to arrive at Bidston from around 14:45, while services from Wrexham Central are still being sourced.

    Flood warnings

    Natural Resources Wales continues to monitor river levels closely. A number of flood alerts remain in force, including:

    • Mawddach and Wnion catchment

    • River Conwy at Gwydir Road

    • Upper Dee catchment

    • Vyrnwy catchment

    • Conwy catchment

    • Dyfi catchment

    Several warnings and alerts have now been lifted in the last 24 hours, including those for the River Neath, Gower Peninsula, Llanelli rivers, and the Rivers Taf and Cynin.

    Looking ahead, the overall flood risk for Wales over the next five days is assessed as very low, although there remains a chance of surface water and river flooding in places up to Wednesday.

    Weather outlook

    According to the Met Office, it will remain windy this evening with coastal gales at first, though conditions should gradually ease into the early hours. Showers are expected, some heavy, but many areas will turn drier overnight. Minimum temperature 10 °C.

    Tuesday should bring a drier and brighter day with some sunny spells, though a few isolated showers are possible. Conditions will remain breezy, with a maximum temperature of around 17 °C.

    From Wednesday to Friday the weather is expected to stay changeable, with rain and strong winds at times, and the possibility of further coastal gales. It will feel milder and more humid towards the end of the week.

    Advice

    • Drivers are urged not to attempt to travel on closed roads and to follow diversions in place.

    • Avoid driving through flood water, as even shallow levels can be dangerous.

    • Keep up to date with the latest information from Traffic Wales, Transport for Wales, and Natural Resources Wales.

    For live updates on the roads, visit Traffic Wales, and for the latest on flood alerts, go to Natural Resources Wales.

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    Rhys Gregory
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    Editor of Wales247.co.uk

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