Unusually Warm Conditions Set to End as Cooler Weather Approaches

Temperature Trends

Wednesday may offer a summer-like experience for many, despite being early April. The UK has seen a remarkable spike in temperatures, with Tuesday marking a notable high of 25°C (77°F) at Mona, Wales, which set a record for the year and surpassed the previous warmest day in six months. This could signal a continued heatwave, as some areas may push temperatures to 26°C (79°F) on Wednesday. However, the warmth is expected to fade by Thursday, bringing a noticeable drop in temperatures.

Most of England and Wales will remain dry and sunny on Wednesday, with the milder weather sustained by a south to south-easterly breeze from the continent. While the Midlands, East Anglia, and south-east England will see the highest readings, western coastal regions may feel the chill more, with cloud cover increasing in northern parts, especially during the afternoon.

This is around 10°C above average for early April.

Weather Pattern Shift

By Thursday, the weather system will undergo a significant transformation. A weather front will introduce rain, sweeping across the nation from the southeast. This shift is anticipated to bring cooler air, with temperatures dropping to 10–14°C (50–57°F) in most areas. However, East Anglia and south-east England might still experience up to 20°C (68°F) before the rain arrives.

On Friday, high pressure is expected to return, restoring dry and sunny conditions to England and Wales, though temperatures will be modest, ranging between 12–15°C (54–59°F). Meanwhile, western Scotland and Northern Ireland will face cloudier skies and stronger winds, indicating a transition to a more variable weather pattern.

Historical Context

The last time the UK saw temperatures of 25°C or higher was on 19 September 2025, when St James’s Park, London, recorded 27.8°C—a peak for that season. In recent years, 25°C was reached in April 2017 and 2020, but 2023 saw the threshold pushed to the final day of the month. The UK’s all-time April temperature record, 29.4°C (84.9°F), remains from 1949 in London, though this week’s warmth suggests the potential for new records in the future.

Pollen Season Update

With the increase in sunshine and heat, pollen levels have surged, particularly in England and Wales. Wednesday will bring very high pollen counts, exacerbating hay fever symptoms for many. Birch tree pollen, which is prevalent in spring, is a key trigger, affecting 25–35% of sufferers. The pollen season typically runs from March to early June, but Thursday’s cooler conditions may reduce levels in Scotland and Northern Ireland, while keeping them elevated in southern regions.

Monthly Outlook

For those planning summer holidays, the current weather pattern highlights the variability of spring. While the UK experiences unexpectedly warm days, the broader climate trend shows spring as the season with the fastest warming rates. For a more detailed forecast, visit the longer-range outlook. Travelers may find certain regions more favorable depending on the weather, but the coming days will likely offer a mix of conditions to navigate.