Mynydd Illtyd (Powys) weather

Headline:

Briefly settled before returning to wet and windy conditions.

Today:

A bright and dry start for most, with some patchy cloud lingering at first. A largely settled day, with prolonged sunshine, though the odd light shower is possible in the west. A light breeze, with temperatures near average. Maximum temperature 9 °C.

Tonight:

Remaining largely settled overnight, with skies becoming clear allowing frost patches to form. Turning increasingly cloudy with strengthening winds from the west from dawn ahead of a rain band. Minimum temperature 3 °C.

Wednesday:

A wet and windy day as a band of prolonged rain spreads eastwards, bringing heavy and disruptive downpours, with coastal gales likely and localised flooding possible. Maximum temperature 11 °C.

Outlook for Thursday to Saturday:

Remaining unsettled on Thursday with further heavy and disruptive rainfall. Friday brings bright and drier conditions, with occasional showers, before another rain band moves in on Saturday. Often breezy.

The unsettled theme is likely to continue through the first part of this period, with further rain or showers affecting many parts at times, and often accompanied by rather windy conditions. In the run up to Christmas, there is a signal for less unsettled conditions to begin to take hold, with a greater chance of high pressure developing in the vicinity of the UK compared to the previous few weeks. Whilst the chance of impactful rain or strong winds should reduce, there may be an increasing incidence of overnight frost and fog, the latter perhaps taking its time to clear, given the time of year. A gradual reduction in temperatures seems likely, falling closer to average overall. Some cold days are possible, if or where any fog persists.

High pressure will probably be close by to the UK at the start of this period, which would maintain a fair amount of dry, settled weather. With this comes the potential for fog and frost, and lower temperatures overall, though nothing unusually cold is currently signalled. Towards mid-January, perhaps a greater chance of more changeable conditions re-asserting themselves, though this is rather uncertain at present.