UK Weather Shifts: Cold Then Warm

What's happened

Following a warm spell with temperatures exceeding 20°C in mid-March, the UK is now experiencing a sharp drop in temperatures with unsettled weather including rain, strong winds, frost, and wintry showers. Snow is possible over northern hills by Wednesday night. Temperatures will fall to single digits but are forecast to rise to the mid-teens by early next week, bringing more spring-like conditions.

What's behind the headline?

Weather Transition and Impact

The UK’s weather in March 2026 has demonstrated a classic spring volatility, swinging from unseasonably warm conditions to a sharp cold snap. The initial warmth, driven by high pressure and the Foehn effect, pushed temperatures above 20°C, surpassing typical March averages and even outpacing southern European cities like Barcelona and Athens. This sudden warmth was short-lived as Arctic air masses, propelled by a strengthened jet stream originating from North America, swept across the UK.

Drivers Behind the Shift

The collision of warm Gulf of Mexico air with Arctic cold in the US intensified the jet stream, which then accelerated across the Atlantic, deepening low-pressure systems near Iceland. These systems ushered in cold, wet, and windy weather, including snow at lower elevations in Scotland and northern England. The Met Office’s warnings for snow, ice, and strong winds reflect the severity of this transition.

Regional Variations and Forecast

Scotland and Northern Ireland have borne the brunt of the cold and wintry conditions, with snow and frost persisting into the weekend. England and Wales experienced milder, though still unsettled, weather with temperatures dipping but forecasted to rebound to mid-teens Celsius by early April. The southeast is expected to see the driest and warmest conditions, benefiting from sunnier spells and less wind.

Implications for the Public

This pattern underscores the importance of preparedness for rapid weather changes in spring. The wide diurnal temperature range, with warm days and chilly nights, increases risks of frost and icy conditions, particularly in northern and rural areas. The return of unsettled weather after a warm spell may affect outdoor plans and travel, especially over Easter.

Outlook

While temperatures will rise next week, sustained warmth remains uncertain. Changeable conditions with intermittent rain and wind will continue to characterize the UK’s weather into April. This volatility is typical for the season but highlights the challenges in forecasting and the need for public awareness of sudden weather shifts.

How we got here

The UK experienced its warmest day of the year so far in mid-March, with temperatures reaching over 20°C due to high pressure and the Foehn effect. This was followed by a shift to colder Arctic air, bringing unsettled conditions with snow, frost, and strong winds. The jet stream and low-pressure systems have driven this transition.

Our analysis

The Independent’s coverage, including reports by Steven Keates and Alex Deakin, emphasizes the transition from warm to cold weather, highlighting the role of Arctic air and the jet stream in driving the change. Keates noted the "strong signal for wet and windy conditions" over Easter, while Deakin described the "cold plunge" and potential for snow in northern Scotland as a "shock to the system" after the warm spell. The Scotsman’s Alison Campsie detailed the diurnal temperature range and the impact of the Foehn effect in boosting temperatures before the cold snap. Sky News and BBC News provided complementary perspectives, with Sky News forecasting highs up to 22°C before the drop and BBC highlighting the spring equinox and increasing daylight as factors influencing the weather pattern. The Met Office’s warnings for snow, ice, and strong winds were consistently reported, underscoring the seriousness of the cold snap. Together, these sources offer a comprehensive view of the UK’s volatile spring weather, blending meteorological explanation with practical forecasts and warnings.

Go deeper

• What caused the sudden drop in UK temperatures after the warm spell?
• How will the weather affect travel and outdoor plans over Easter?
• When can we expect more stable and warmer weather in the UK?

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