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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Metro Report weather desk. Data from national met services via Open-Meteo.
September in the UK brings a clear shift from summer to autumn, with average highs ranging from 17°C in northern Scotland to 20°C in southern England. The month is typically settled but with increasing cloud and occasional rainy spells, especially in the west.
What’s the typical September weather across the UK?
In England, September often delivers mild days and cool nights. London sees average highs around 19-20°C with around 50mm of rain, while Edinburgh stays cooler at 15-16°C but remains relatively dry. Near Manchester, temperatures hover near 17°C with more frequent drizzle. The south and east coasts, including Bristol, enjoy more sunshine, but inland areas like Birmingham and Sheffield see variable cloud. Overall, September 2026 is expected to follow the long-term trend of moderate warmth and occasional unsettled periods, based on Met Office outlooks.
Is September a good month for outdoor plans?
Generally yes. The last two weeks of September often bring the best conditions for walking or visiting cities, though rain can develop suddenly. The sea around the UK remains warm enough for coastal walks but swimming is for the hardy. For up-to-date details, check our UK weather hub or a 10 Day Weather Forecast UK.
What should I wear in London in September?
Layering is key. A light jacket or cardigan over a T‑shirt works for daytime, with a raincoat or umbrella handy. After 7pm temperatures drop to around 12°C, so a warmer top or scarf helps.
Is September a rainy month in the UK?
It’s not the wettest month — that’s usually October or November — but rain is still common, especially in western areas like Wales and the Lake District. Eastern counties tend to be drier.
How does September weather compare to October?
September is typically 2-3°C warmer and less stormy than October. There’s more daylight and more settled spells, though both months can produce pleasant afternoons.