Storms and rain possible in Chiswick tomorrow — Friday forecast
20 August 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
Friday 21 August looks set to be a notably unsettled day for Chiswick, with the Met Office flagging a real risk of storms alongside persistent cloud and rain.
The forecast gives a high of 22°C and a low of 14°C — a marked step down from the warmer days earlier in the week. There is a 60 per cent chance of rain, and the Met Office has specifically noted storm conditions as a possibility, so heavier downpours and thunder cannot be ruled out. The UV index of 6 is surprisingly high given the cloud cover, worth bearing in mind for anyone spending time outdoors between showers.
If you have plans outdoors on Friday — in the garden, at one of Chiswick's parks, or heading to the Farmers' Market — it would be wise to keep an eye on the forecast and have a backup plan. A light waterproof jacket will be more useful than sunscreen, though you may find yourself needing both.
The Met Office recommends checking for any yellow weather warnings before the day begins. Met Office forecast