UK Weather Warning: Enjoy Balmy 20C Sunshine Before Arctic Blast Hits
Weather forecasters are warning Britons to make the most of unseasonably warm conditions this week before a dramatic Arctic blast brings temperatures plunging to -6C and heavy snow later this month.
Warmest Days of the Year Expected
This week will see the warmest temperatures of 2026 so far, with Met Office maps indicating highs of 20C in western England and Wales on Wednesday. This makes parts of the UK hotter than Mediterranean holiday destinations like Ibiza during this period.
Dan Harris, Chief Forecaster at the Met Office, explained: "Wednesday looks likely to be the warmest day of the week for many, with high pressure dominant. The warmest spots are likely to be in parts of west Wales and western England, where under sunny skies, 18-19C, possibly even 20C is on the cards."
Temperatures are expected to reach 18C quite widely across England, while Northern Ireland and Scotland will experience slightly cooler conditions. The pleasant weather results from two high-pressure systems moving in from southern and central Europe, replacing the weekend's cold snap.
Dramatic Temperature Plunge Forecast
However, the mild conditions won't last. Weather maps from WXCharts show temperatures will plummet dramatically toward the end of March, with forecasts predicting:
- Temperatures dropping to -5C in Scotland
- Possible lows of -6C in Wales
- Most areas experiencing temperatures near or below freezing
The Met Office forecast for March 21-30 indicates that while the period will start dry with pleasant spring sunshine, conditions will deteriorate significantly as cold polar air sweeps across the UK.
Heavy Snow Predictions
WXCharts weather models show thick snow falling on March 30 across:
- The Midlands
- Central and northern Wales
- Northern England and Scotland (with flurries predicted)
The dramatic temperature swing will create what forecasters call a "big diurnal range" - a significant difference between daytime maximums and overnight minimums. Clear skies will lead to chilly nights with potential air frost following the warmer days.
The Met Office added: "How long the settled conditions last is less certain with some signals that showers/rain could return later in the period, most likely to the south."
Britons are advised to enjoy this week's spring-like warmth while it lasts, as winter conditions are set to make an unexpected return before the month ends.
