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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the UrbanMixr weather desk. Data from national met services via Open-Meteo.
September in the UK brings mild days, cooling nights and the first real shift into autumn. Expect average highs of 17–19°C in London and the south, dropping to 14–16°C around Edinburgh and Glasgow, with crisp mornings and occasional warm spells.
What’s the weather actually like across the UK in September?
September weather varies noticeably by region. Southern England, including London and Bristol, often enjoys settled spells with some late-summer warmth, while northern cities such as Manchester, Sheffield and Glasgow see more cloud and a higher chance of rain. Scotland’s Highlands can feel distinctly autumnal by mid-month. Rainfall averages 60–80mm across most of the UK, though western coasts tend to be wetter. For the latest outlook, check the 10 day weather forecast UK before you travel.
What should I pack and when should I go?
For weather in London in September, what to wear means layers: a light jacket or cardigan over a T-shirt or blouse, with comfortable walking shoes for damp pavements. A compact umbrella is essential, especially if you’re heading to Edinburgh or the Lake District. School holidays are over by early September, so attractions are quieter and accommodation prices drop — good value for a late break. If you’re looking at september weather near Manchester or the Peak District, expect cooler evenings and pack a mid-layer.
Is September a good month to visit the UK?
Yes — crowds thin after the summer holidays, prices drop, and the weather often remains pleasant, especially in southern England. September weather in Edinburgh can be bracing but the city is less busy than in August.
Does it rain all day in September?
Rarely. September showers tend to be short and intermittent, with plenty of dry, bright spells. The BBC’s september weather bbc forecasts are a reliable way to plan around any wetter windows.
Will I need warm clothes for London in September?
Light layers work best. A medium-weight jacket or fleece is fine for evenings, but you won’t need a heavy winter coat unless you’re heading north. Check UK weather updates before you pack.