London is forecast to experience temperatures reaching 26C this week, a peak that could render it warmer than Barcelona. This surge of warmth, predicted by the Met Office, follows a period of inclement weather, including snow and winds up to 93mph from 'Storm Dave'.

The forecast suggests London could reach its hottest day of the year so far, with specific mention of Wednesday peaking at 26C, and Thursday seeing a continued 21C in southern areas. This ephemeral warm spell is described by Met Office chief forecaster Paul Gundersen as a "brief but notable spell of very warm weather for early April," potentially the warmest such period since 2020.

Other regions are also expected to see favourable conditions. Manchester and parts of Wales are anticipated to hit highs of 21C. Widespread sunshine is predicted across most of the United Kingdom, particularly in the south and east, contributing to the warm feel.
Read More: Storm Dave brings 80mph winds and 20cm snow to Scotland this Easter weekend

However, this period of pleasant weather appears to be transitory. The outlook for Friday into the weekend indicates a shift towards unsettled conditions, with rain and cooler temperatures expected to move in.

Historically, the definition of a heatwave in the UK involves three consecutive days where temperatures surpass a specific threshold, which varies geographically. The potential for temperatures to reach 30C in some areas later in the week, as suggested by some reports, raises the possibility of such conditions occurring at an unprecedentedly early point in the year.
The recent stormy conditions, which brought significant disruption to northern parts of the UK, stand in stark contrast to the impending warmth, highlighting the volatility of the current weather patterns.