Weather in the United Kingdom for September 2025
In general, the average temperature in the United Kingdom at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °C by the end of September.
United Kingdom sees moderate rainfall in September, averaging 8 rainy days.
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United Kingdom in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  23° | 3 24° | 4  22° | 5  22° | 6  26° | 7 26° |
| 8 24° | 9 24° | 10 25° | 11 20° | 12 17° | 13 17° | 14 20° |
| 15 23° | 16 23° | 17 21° | 18 22° | 19  21° | 20  20° | 21 21° |
| 22 19° | 23 18° | 24 18° | 25 19° | 26  19° | 27 16° | 28 17° |
| 29 16° | 30 17° |
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Temperatures trend during September in the United Kingdom
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 23° /15° | 5.6 mm | 5 | |
| 2 Sept. | Patchy rain possible | 23° /17° | 0.3 mm | 5 | |
| 3 Sept. | Overcast | 24° /15° | 0.9 mm | 5 | |
| 4 Sept. | Sunny | 22° /14° | 4.9 mm | 6 | |
| 5 Sept. | Partly cloudy | 22° /15° | 4.1 mm | 6 | |
| 6 Sept. | Cloudy | 26° /17° | 2.3 mm | 6 | |
| 7 Sept. | Sunny | 26° /17° | 4.3 mm | 7 | |
| 8 Sept. | Sunny | 24° /17° | 10 mm | 6 | |
| 9 Sept. | Sunny | 24° /17° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 25° /16° | 1.6 mm | 6 | |
| 11 Sept. | Cloudy | 20° /13° | 0.9 mm | 5 | |
| 12 Sept. | Overcast | 17° /11° | 0.3 mm | 4 | |
| 13 Sept. | Overcast | 17° /11° | 0 mm | 4 | |
| 14 Sept. | Partly cloudy | 20° /11° | 0 mm | 6 | |
| 15 Sept. | Sunny | 23° /12° | 0 mm | 7 | |
| 16 Sept. | Partly cloudy | 23° /14° | 0 mm | 7 | |
| 17 Sept. | Light rain shower | 21° /14° | 1 mm | 6 | |
| 18 Sept. | Light rain shower | 22° /13° | 5.1 mm | 5 | |
| 19 Sept. | Light rain | 21° /14° | 1 mm | 5 | |
| 20 Sept. | Moderate rain | 20° /14° | 13 mm | 5 | |
| 21 Sept. | Light rain shower | 21° /13° | 3.5 mm | 5 | |
| 22 Sept. | Patchy light drizzle | 19° /13° | 8.8 mm | 5 | |
| 23 Sept. | Partly cloudy | 18° /11° | 0.3 mm | 5 | |
| 24 Sept. | Cloudy | 18° /13° | 1.1 mm | 4 | |
| 25 Sept. | Overcast | 19° /13° | 1.7 mm | 5 | |
| 26 Sept. | Thundery outbreaks possible | 19° /13° | 6.9 mm | 5 | |
| 27 Sept. | Patchy rain possible | 16° /11° | 4.8 mm | 4 | |
| 28 Sept. | Overcast | 17° /9° | 0.1 mm | 4 | |
| 29 Sept. | Patchy rain possible | 16° /11° | 1 mm | 4 | |
| 30 Sept. | Cloudy | 17° /11° | 9.8 mm | 4 | |
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Guide for the United Kingdom in September
In the United Kingdom, September marks the transition from summer to autumn, bringing varied weather patterns throughout the month. At the beginning of September, the weather in the UK is typically mild with occasional warm spells, especially in the southern regions.
The average temperatures range from 14° in the north to 17° in the south, with intermittent rainfall and cloudy skies. As the month progresses, the temperatures gradually begin to decrease, particularly in the northern parts of the country.
By the end of September, the weather in the UK becomes noticeably cooler, with average temperatures dropping to around 11° in the north and 14° in the south. The likelihood of rainfall increases, and there may be more overcast days as autumn sets in.
However, it's important to note that the weather in the UK can be quite unpredictable, and variations in temperature and precipitation can occur across different regions.
Overall, September in the United Kingdom offers a mix of transitional weather, making it advisable for travelers to pack layers and be prepared for potential changes in the weather throughout the month.
United Kingdom in September - FAQ
September rainfall patterns in the United Kingdom
UV exposure in United Kingdom during September
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