The UK is poised for a warm start to spring, with temperatures potentially hitting 18°C in the south on Thursday, the first day of astronomical spring. This marks a significant rise from earlier in the week, with the spring equinox bringing weather seven to eight degrees above the seasonal average, according to BBC Weather.
West Wales, central England, and southern regions are likely to experience the warmest conditions, though cloud cover could influence temperatures. In the north, Edinburgh and Belfast are forecast to reach 10°C and 13°C, respectively. Met Office meteorologist Becky Mitchell noted, “The spring equinox will coincide with some nice warm weather, definitely feeling spring-like.”

While Thursday may not break records—Crosby hit 19.7°C on 9 March—it will still bring a welcome taste of spring. The week begins with frosty nights and average daytime highs, but conditions will improve. Monday will be cloudy, turning sunnier by Tuesday. Wednesday will see fine weather in the north, with a chance of showers in the south.
By Thursday, mist and fog will lift, leaving a mostly sunny day as southerly winds bring warmer air. However, rain may spread from the south overnight, leading to cooler, unsettled weather on Friday.
The spring equinox, marking the start of astronomical spring, occurs just after 09:00 on 20 March, aligning with the warm spell. This surge in temperatures offers a promising start to the new season across the UK.