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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Pack a light jacket and an umbrella for London in September: the month offers mild days, cool evenings and occasional rain, with the live forecast above showing the current conditions.
What is the typical weather in London during September?
September in London marks the transition from summer to autumn. Daytime highs usually sit around 18–20°C, dropping to 12–14°C overnight. Rainfall is moderate, averaging 50–60 mm across the month, spread over 10–12 wet days. Sunshine is still generous, with about 5–6 hours of sun per day.
What should you pack for visiting London in September?
Layers are key. A light jumper or cardigan works for daytime, and a waterproof jacket or trench coat handles the frequent drizzle. Comfortable walking shoes are essential if you plan to explore parks and streets. A scarf can also help on cooler evenings.
Is September a good month to visit London?
Yes. The weather in September is generally mild and pleasant, with fewer crowds than peak summer. It is a comfortable time for sightseeing, with lower chances of heatwaves or heavy downpours compared to July or August.
Does it rain a lot in London in September?
Rain is common but usually light to moderate. London sees about 10–12 wet days in September, so an umbrella is wise. Heavy all-day rain is rare; showers tend to be brief and scattered.
How does September compare to October in London?
September is warmer and sunnier than October. Average highs drop by 2–3°C in October, and rainfall increases slightly. For a balance of mild weather and lighter crowds, September is often preferred over October.
For more UK weather details, see our Weather Forecast London page. If you are planning a broader trip, check Australia weather hub for comparisons and links to other destinations such as Edinburgh weather (September weather in Edinburgh is cooler and rainier).