Thunderstorms forecast for Barnes today — 25°C but keep an umbrella handy
26 August 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
After yesterday's sunshine, Wednesday brings a rather different picture. The Met Office is forecasting thunderstorms for Barnes today, Wednesday 26 August, with a high of 25°C and a low of 19°C overnight. There is a 54% chance of rain, so anyone planning to spend time outdoors should be prepared for a sharp downpour.
The UV index remains at 5 — moderate — meaning sun protection is still worthwhile during any bright spells between the storms. Temperatures will feel warm and humid, which is often what drives the build-up of thundery conditions at this time of year.
If you are travelling by bike or on foot this morning, it is worth checking the forecast before you set out, as storms can develop quickly. Gardens and outdoor events may want to have contingency plans in place. Parents with children heading to late-summer holiday activities should pack a waterproof.
The full forecast, including hourly breakdowns, is available from the Met Office.