A ridge of high pressure extends from Scandinavia across the British Isles on Friday. After any early morning mist or fog patches clear, it will be a dry day with a mixture of sunny spells and cloudy skies. The best of the brightness will be over southeastern areas where it will feel very warm in the sunshine. Cloudier skies in the northwest as a front approaches from the Atlantic. Highs at 13 to 14C on eastern coasts, more widely 18 to 21C.
It will be mostly dry overnight though a few light spots of rain may edge into the far northwest of Ireland and Scotland through the wee hours. Cloudier skies in the north and west, clearer skies to the southeast. A few mist or fog patches may form. Overnight lows staying around 6 to 9C.
High pressure keeps the weather fair for most into the start of the holiday weekend. Any mist or fog patches should clear quickly to leave a warm day with some good spells of sunshine, particularly in the southeast. It will be cloudier over the northwest throughout the day with a few showers and spots of rain for Northern Ireland and northwestern Scotland. High temperatures for most at 18 to 21C, warmer in the southeast at 22-23C. Just 11-12C expected in the northwest of Scotland.
Sunday sees the arrival of low pressure in the far northwest so it will be an overcast day for the island of Ireland, Scotland, much of Wales and the north of England. Any early morning mist or fog patches should clear quickly as temperatures rise. Showers over Scotland through the morning should ease for most by the afternoon although a few spots of rain may linger in the northeast. Elsewhere it should be a mostly dry day, feeling particularly warm in the sunshine in the southeast. High temperatures at 15 to 21C.