Concrete and traffic store heat. London and other large UK cities often stay warmer overnight than surrounding countryside during heatwaves.
On meridian, read the overnight hourly temperatures — not only the daytime max — if you care about sleep comfort or early starts.
UV and afternoon peaks still matter for outdoor work; pair them with wind, which can make heat feel less stagnant even when the thermometer stays high.
We stay within OpenWeather’s free-tier detail. For health warnings, follow Met Office and local authority guidance alongside any app.
