This Evening and Tonight: A much clearer evening and night will allow temperatures to tumble, leading to a widespread frost forming. Fog patches are likely to develop, some of these freezing.
Saturday: A clear and cold start, away from fog, will transition to a cold but cloudy morning, as rain arrives for the afternoon.
Outlook: Sunday should be a fine day with sunny spells. Overnight, a band of prolonged rain will affect most areas. Monday and Tuesday will be windier with some blustery showers.