Another scorching day in Chiswick — 35°C and UV index 9
26 June 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
Thursday is set to be another extremely hot day in Chiswick, with the Met Office forecasting a high of 35°C and a low of 23°C overnight. There is just a 5% chance of rain, and the UV index reaches 9 — classed as very high. Met Office forecast
A UV index of 9 means unprotected skin can burn in as little as 15 minutes, so sun cream (SPF 30 or higher), sunglasses and a hat are a must if you're spending any time outside. The NHS advises drinking plenty of water throughout the day and avoiding strenuous activity during the hottest hours, typically between noon and 3pm.
For families, Chiswick's tree-lined riverside paths and the shaded areas of Chiswick House grounds offer cooler alternatives to more exposed spots. Gunnersbury Park also has shaded benches near the lake.
Those with elderly neighbours or vulnerable relatives are encouraged to check in on them during the afternoon peak. Public Health England's heat-health alert guidance is available via the NHS website for anyone seeking further advice on staying safe in extreme temperatures.