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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the UK Bullet weather desk. Data from national met services via Open-Meteo.
Expect a marked transition in September: summer warmth fades, but the month often delivers settled, pleasant spells, particularly across southern England, making it a reliable window for outdoor plans before autumn fully arrives.
What is the typical September weather pattern across the UK?
September straddles summer and autumn, so you can expect cooler mornings, a gradual drop in daytime highs, and an increased chance of rain, especially from mid-month onwards. Southern and eastern areas, including London and the Home Counties, often enjoy the best of any late-season warmth, while northern and western regions, such as Scotland and the Lake District, see more cloud and rain.
How does September weather vary by region?
In London and the South East, highs average 18–21°C, with drier conditions and some sunny days. For those asking about weather in London in September what to wear, layers are key: a light jacket or cardigan for mornings and evenings, with a T-shirt or blouse for afternoon warmth. In Scotland, particularly for September weather in Edinburgh, expect cooler highs of 14–16°C and a higher chance of drizzle. The Midlands, including September weather near Manchester, sits in between with averages of 16–19°C and a mix of sun and showers.
What should I do to prepare for September weather?
Pack layers and a waterproof jacket, as conditions can shift from warm sun to sudden showers. The September weather UK pattern is often best for hiking or city breaks, but always check September weather BBC forecasts or the Met Office for local updates. For those planning ahead, September weather UK 2026 long-range outlooks suggest a similar transition, though early-month warmth may be slightly above average.
What is the weather like in September in the UK overall?
It is a transitional month with warm, dry spells early on, cooling and becoming wetter by late September. Southern England sees the best weather; Scotland and the north are cooler and rainier.
What to wear in London in September?
Light layers work best: a T-shirt or blouse beneath a medium-weight jacket or cardigan. Comfortable shoes are essential, and a small umbrella or packable raincoat is wise for sudden showers.
Is September a good month for outdoor activities?
Yes, early to mid-September offers excellent conditions for walking, pub gardens, and sightseeing. Crowds thin out, and temperatures are pleasant for most activities, especially in southern England.
For more on regional conditions, visit UK weather hub, London weather or 10 Day Weather Forecast UK.