Hot and cloudy in Chiswick today — 29°C with a high UV index
5 July 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
Saturday is shaping up to be the warmest day of the week in Chiswick, with the Met Office forecasting a high of 29°C and a low of 18°C overnight. Cloud cover is expected to keep direct sunshine limited, but the UV index reaches 8 — firmly in the 'very high' category — meaning sun cream is advisable whenever you are outdoors, even without clear blue skies.
The chance of rain is just 5%, so outdoor plans should be fine. The combination of heat and humidity that often accompanies cloudy summer days in London can feel more oppressive than a clear sunny day, so it is worth staying hydrated if you are spending time at Dukes Meadows, Chiswick House grounds, or any of the local parks.
Bear in mind that public transport is unusually disrupted today, with signal failures affecting the Piccadilly and District lines and engineering work on the Mildmay Line this evening — so if you are planning a day trip, give yourself extra time or check alternatives before heading out. Full forecast from the Met Office.