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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Current UK weather desk. Data from national met services via Open-Meteo.
September weather across the UK is mild and changeable, with average highs of 17–20°C in the south and 14–17°C further north. It’s a transitional month, offering many fine days alongside the first real taste of autumn, so pack layers and a waterproof.
What is the typical September weather pattern for the UK?
September sits between summer and autumn, meaning you can expect a mix of sunny spells, cloudy intervals and occasional rain. Southern England often sees the warmest conditions, while Scotland and northern England cool more quickly. The likelihood of Atlantic weather systems increases as the month progresses, bringing breezy days and showery spells. If you’re checking September weather London values, the capital tends to stay slightly warmer than the rest of the country. For weather in September UK as a whole, expect around 50–80mm of rain depending on your location, with the west and north typically wetter than the east.
What should you pack for a September trip?
Layers are essential. A lightweight jacket or a midweight waterproof coat will cope with sudden showers and cooler evenings. The weather in London in September what to wear question is easily answered: a mix of short sleeves, long sleeves and a cardigan or fleece. Casual footwear that can handle damp pavements is wise, especially if you plan to explore rural areas. September can still feel warm in the middle of the day, so a T‑shirt underneath your jacket often works well. For September weather in Edinburgh, add a scarf and a warmer top – the capital’s coastal position brings a bracing breeze.
Is September a good month to visit the UK?
Yes – it’s often more affordable than August, with thinner crowds and many attractions still open. The weather is generally pleasant for sightseeing, though you should expect occasional rain and cooler evenings.
Will it rain a lot in September?
Rain is common, but not constant. Southern and eastern areas see lighter totals (50–70mm), while western Scotland and northern England can receive double that. A waterproof jacket will see you through most days.
What are the sea temperatures like in September?
UK coastal waters remain surprisingly warm, especially on the south coast where sea temperatures hover around 16–18°C. It’s still comfortable for coastal walks and, for the hardy, a brief swim.
Sources
For the latest conditions, check our UK weather hub or the 10 Day Weather Forecast UK. If you’re looking for September weather BBC updates, those forecasts are also referenced in our sources above. Looking ahead to September weather UK 2026, long‑range predictions remain uncertain, but typical averages are a reliable guide. For those near Liverpool or Manchester, the September weather near Manchester tends to mirror the north‑west’s mild, damp pattern – our Liverpool Weather page gives a close comparison.