Fog could disrupt plans and journeys across large parts of Wales from this evening, with the Met Office putting a yellow weather warning in place overnight.
When the warning applies
The warning comes into force at 6pm today, Sunday 8 November 2026. It stays in place until 11am tomorrow, Monday 9 November.
Areas covered
Fifteen council areas in north, mid and south Wales fall within the warning:
- Blaenau Gwent
- Caerphilly
- Cardiff
- Conwy
- Denbighshire
- Flintshire
- Gwynedd
- Merthyr Tydfil
- Monmouthshire
- Newport
- Powys
- Rhondda Cynon Taf
- Torfaen
- Vale of Glamorgan
- Wrexham
How far visibility could fall
The Met Office forecast covers six towns: Cardiff, Newport, Wrexham, Bangor, Llandudno and Brecon. Of these, Brecon is expected to see the poorest conditions. Visibility there is forecast to drop to 110m at around 3am on Monday.
The lowest visibility forecast across those six towns, in three-hour steps, is:
- 3pm Sunday: 4km (Newport)
- 6pm Sunday: 4km (Newport)
- 9pm Sunday: 1000m (Brecon)
- Midnight: 160m (Brecon)
- 3am Monday: 110m (Brecon)
- 6am Monday: 150m (Brecon)
- 9am Monday: 430m (Wrexham)
- Noon Monday: 5.3km (Wrexham)
The forecast suggests the fog will be at its worst in the early hours. Visibility is expected to improve again by midday on Monday.
What a yellow warning means
Yellow is the Met Office's 'be aware' level. The forecaster says the fog could cause disruption to travel and to people's plans while the warning is in force.
The warning and the forecast for individual towns can be checked on the Wales Updates weather page.
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