Christmas Day
High pressure dominates, keeping weather generally settled. Breezier in the north and west, with some light rain over the northwestern Highlands and northwestern Ireland. Patchy drizzle possible in most areas. Brighter spells in most eastern areas as well as central England. A mild day, with temperatures peaking at 10 to 11C, 13C in Ireland.
 

Wednesday Night
High pressure spreads northward, calming winds across the British Isles. Expect plenty of cloud and some fog developing later tonight, especially in southern England. Rain across north Ireland and Scotland may intensify and drift south towards the Central Belt. Isolated patches of rain may be heavy. Lows of 5C England and Wales, 8 to 9C Ireland and Scotland.
 

Thursday
Morning fog possible in southern England. Bright spells and occasional sun possible across much of England as fog dissipates. Northwestern Scotland may see the best of the brighter weather, while western Scotland and Ireland could experience some light drizzle. Elsewhere, mostly cloudy with bright spells. Intermittent rain continues in the Central Belt. Highs of 9C in Britain, 11C in Ireland. 7C in northern Scotland.

Friday
High pressure lingers keeping things settled in most places. Calm conditions across England and Wales allowing fog patches to form overnight and persistent clouds through the day. Light drizzle here and there. Periods of light rain over northwest Ireland and western Scotland with a gentle breeze. Highs of 7C north, 10C in the far south.