People planning events or outdoor activities should check the weather forecast often, especially in early September, and be ready with backup plans for rain or wind.
September Weather Forecast 2025
September marks a poignant shift from summer’s lingering warmth into the crisp embrace of autumn. As seasons transition, weather patterns become more variable—ranging from lingering sunny spells to sudden rainstorms, cooling temperatures, and striking contrasts. This article explores what typically unfolds across the UK and Europe during September, backed by the latest forecasts, climate normals, and historical trends.
Temperatures: Across the UK, typical September highs hover around 17 °C (62 °F) and lows near 9 °C (48 °F). Current Results
In London, daytime highs gradually fall from 20 °C (68 °F) on September 1 to about 18 °C (64 °F) by month’s end, with night temperatures dipping from 15 °C (59 °F) to around 12 °C (54 °F). Holiday WeatherLondon Perfect
Regional variations reveal averages ranging from 10–18 °C, roughly 8 cm (3 inches) of rainfall, around 12 rainy days, and approximately 6 hours of sunshine per day. Global Highlights
London specifics: Typical daily weather shows highs of 20 °C (68 °F) and lows of 10 °C (49 °F). Rain probability is around 20%, with about 8.4 mm on rainy days. Average sunshine spans 11.6 hours, daylight averages 12.7 hours, humidity sits around 78%, and wind speeds average 15.7 mph. Wanderlog
In Manchester, highs dip from around 19 °C (66 °F) to 16 °C (60 °F) during September; lows go from 12 °C (53 °F) to 9 °C (49 °F). Weather Spark
England overall sees average minimum/maximum of 10.4 °C / 18.1 °C, with mean daily temperature around 14.3 °C. Climate to Travel
Sunlight & precipitation patterns: London, Manchester, and Newcastle show around 50% clear skies, 7–9 rainy days, moderate rainfall, and 12.6 hours of daylight (e.g., in London). Weather Spark
Western Europe: Averages include maximums of about 19 °C and minimums near 11 °C. TravelTriangle.com
Eastern Europe: More favourable with average highs of 22 °C and nighttime lows dropping to 12 °C. TravelTriangle.com
Mediterranean regions: Enjoy balmy conditions in September—average highs reaching 29 °C, making it ideal for beach outings. TravelTriangle.com
For instance, France sees highs from 19 °C to 17 °C and lows from 14 °C to 11 °C by month-end. Weather Spark
Data from Copernicus shows September 2024 was the second-warmest globally and in Europe with an average of 16.17 °C, warming trends that underscore our changing climate. Copernicus Climate Change Service+1
Even as monthly averages offer a baseline, recent forecasts suggest early autumn may bring fluctuating patterns.
Weather forecast Uk
Storms and unsettled weather are projected: Two notable systems are expected—one peaking around August 30, and another beginning September 3. These are likely to bring heavy rain, thunderstorms, hail, and gusty winds, especially in western and southern areas. The SunThe Sun
Hurricane Erin’s remnants have already catalysed unstable weather—bringing strong winds, hail, and showers—while further unsettled conditions are likely to persist into September. The SunThe Times
Tropical Storm Fernand’s remnants may further amplify weather disturbance via the jet stream, potentially delivering additional heavy rainfall and wind. The Times
Overall mid-September pattern: Low-pressure systems dominate early in the month, ushering in showers, possible thunderstorms, and near-average temperatures. More stable spells are possible in between—but confidence in those remains low. The Sun
September heatwaves can still surprise. In 2023, the UK endured the longest September heatwave on record, with daily temperatures soaring above 32 °C, peaking at 35 °C, and ending with thunderstorm warnings. Wikipedia
The legendary 1906 heatwave saw temperatures reach 35.6 °C in Bawtry—the hottest September temperature ever recorded in the UK to date. Wikipedia
In 2024, heavy September rainfall placed the UK on alert for another autumn/winter flooding season. The Environment Agency warned of rising flood risks, urging stronger resilience planning. The Guardian
Notably, in 2012, severe flooding impacted hundreds of homes in Wales, Yorkshire, and North East England after heavy September rainfall. Wikipedia
European land areas have warmed significantly more than the global average—up to nearly 2 °C since pre-industrial times—heightening the frequency of extreme heat events. Wikipedia
New research shows compound extreme heat events in mid-latitude Europe have surged by roughly 10-fold since past decades—precisely the kind of volatility future Septembers may bring. arXiv
Temperature Range: UK typical September highs average 17 °C, while continental highs range from 19–22 °C, and Mediterranean zones near 29 °C.
Rainfall & Patterns: Expect 8 cm total rainfall, 12 rainy days in the UK, and 20% daily chance of rain in London. Forecasts warn of early-month storms and unsettled systems into September.
Leftover tropical storms (like Erin and Fernand) still affect the weather in the UK and Europe, causing sudden changes and short periods of stormy weather
Historical Extremes: September heatwaves are not uncommon—such as in 2023 or 1906. Flood risks also rise during wetter years—e.g., 2012.
Climate Trends: Warming is intensifying September temperature extremes and variability.
Travelers: Pack layers—light clothes for daytime warmth, plus a waterproof jacket. Weather can flip from sunny to stormy rapidly.
People planning events or outdoor activities should check the weather forecast often, especially in early September, and be ready with backup plans for rain or wind.
Gardeners & Farmers: Be ready for both late-season warmth and surprise showers or storms. Adjust planting and harvest timing accordingly.
General Advice: September 2025 in the UK will likely be similar to past years, with some warm days mixed with sudden rain, wind, and cooler temperatures.
September is a month of transition—and in 2025, it’s shaping up to be no different. Expect mild, fluctuating temperatures, a moderate chance of rain, particularly early in the month, and the occasional surprise event—be that a fleeting heatwave, heavy downpour, or a storm system-fed cooldown. Whether you’re traveling, planning events, or simply keeping an eye on the sky, September’s forecast underscores one theme: expect the unexpected.
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