Porthmadog (Gwynedd) weather

Headline:

Turning drier and colder later this week.

This Evening and Tonight:

Remaining damp and cloudy overnight, with rain steadily easing by morning. Breezy along southern coasts. A milder night than Monday night for most but patchy grass frost in northern areas. Minimum temperature 3 °C.

Wednesday:

After a wet and cloudy start, turning brighter for most on Wednesday, with low cloud over central areas. Daytime temperatures near normal but a cold night ahead with widespread frost. Maximum temperature 8 °C.

Outlook for Thursday to Saturday:

Widespread frost and patchy fog to start Thursday, but dry and bright after this and into the weekend. Cold for the time of year with brisk winds which ease later.

High pressure will initially dominate, with widely settled conditions and overnight frost. Some showers are likely in northern and western Scotland though, and perhaps along some other western coasts for a time. Later in the weekend, a transition to more unsettled conditions is expected as bands of rain, and associated areas of low pressure, arrive from the North Atlantic, bringing more widespread wet and windy weather. It is likely to remain fairly changeable through the remainder of the period, with occasional rain interspersed with brighter, showery spells. Whilst colder conditions will be possible at times, especially at first, it will often be mild, with temperatures near or a little above average for the time of year.

Changeable or unsettled conditions are expected initially, with Atlantic weather systems bringing spells of rain and strong winds at times, interspersed with brighter, showery periods. Through late November, low pressure may become slower-moving to the west of the UK, potentially bringing more prolonged rainfall, particularly to southern and western areas, along with a continued risk of strong winds. Into December, confidence becomes low, but there is a possibility that low pressure tracks shift further south as high pressure builds to the north. This could bring further rain at times to central and southern areas, while northern parts become somewhat drier. Temperatures will probably be near or slightly above average in the south, with an increasing chance of colder conditions extending southwards from the north into December.