Hot and sunny in Chiswick today — 31°C with a UV index of 9
25 June 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
After several days of extreme heat, Chiswick is settling into another very warm Wednesday with a high of 31°C and a low of 24°C overnight. The Met Office is forecasting sunshine throughout the day with just a 7% chance of rain — good conditions for spending time outdoors, though the UV index of 9 (very high) means sun protection is genuinely important rather than optional.
With temperatures remaining this elevated, it is worth staying hydrated and keeping an eye on elderly neighbours or anyone who may be struggling in the heat. Green spaces such as Chiswick House grounds and the riverside along the Thames Path will be popular, but afternoon sun exposure should be managed carefully — especially for children and those with fair skin.
The slight easing from earlier in the week's peak of 35–36°C will bring some relief, but 31°C is still well above the seasonal average for late June in London. The full Met Office forecast has the latest hour-by-hour breakdown.