Portstewart (County Londonderry) weather

Headline:

Sunny spells and patchy freezing fog on Tuesday.

This Evening and Tonight:

A cloudy evening over the north coast and the northeast. Otherwise long clear periods, a widespread sharp frost. Also patches of freezing fog forming, becoming more widespread by morning. Light winds. Minimum temperature -4 °C.

Tuesday:

Staying dry, and sunny for most. Fog will be slow to disperse with a few patches lingering all day. It will be a chilly day with light winds. Maximum temperature 6 °C.

Outlook for Wednesday to Friday:

Mainly dry with some sunshine on Wednesday, soem patchy fog, though the south cloudier. Thursday cloudier but dry, Thickening cloud on Friday may bring a little rain.

High pressure will likely weaken into the weekend, allowing occasional bands of rain to make progress southeastwards across parts of the UK. While there may be an attempt for high pressure to rebuild at times, especially in the south, the more likely scenario is for an unsettled regime to dominate for much of next week, with occasional spells of rain followed by blustery showers, these most frequent and perhaps wintry at times in the northwest. It may be quite windy at times too, especially towards the north, while southern areas have a greater chance of some lengthier drier and perhaps more settled spells, although even here it may still be rather breezy. Temperatures will vary around average, with oscillations between colder and milder interludes.

Mainly unsettled conditions appear likely for most, with spells of wind and rain followed by showers affecting most areas but especially the north and northwest of the UK. Some sleet and snow is also likely at times, especially on high ground in the north. However, there are also some signs that more settled conditions are possible at times, these perhaps most likely across the south late in December or into early January. Temperatures are likely to be around average overall, with any more settled interludes bringing a risk of frost and fog.