Heavy rain expected in Barnes today — temperatures reach 23°C
30 September 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
Wednesday brings a mixed picture for Barnes: a mild high of 23°C is on the cards, but residents should expect heavy rain at some point during the day, with the Met Office putting the chance of rainfall at 84%. The low tonight will be a relatively comfortable 14°C.
The UV index sits at 3 — low enough that sun protection is not a priority, particularly given the cloud cover expected throughout much of the day. "Partly cloudy" is the headline description, but the 84% rain probability means it would be unwise to leave home without an umbrella or waterproof.
For anyone planning outdoor activities — the school run, a cycle along the Thames Path, or lunch in one of Barnes's riverside spots — it is worth keeping an eye on the timing of heavier showers before heading out. The Met Office app allows hour-by-hour tracking, which is useful on days like this when the heaviest rain may be concentrated in a particular window.
The forecast rounds off what has been a warm end to September; temperatures in the low twenties are notably above the seasonal average for the last day of the month. October, historically, tends to bring cooler and wetter conditions to southwest London. Met Office forecast