Wales (Cardiff)
September
Weather in Wales for September 2026
Your guide to Wales weather in September - trends and predictions
Until now, September 2026 in Wales has been nearly identical to the historical average, with a temperature of 18.6 °C (showing only a slight deviation of 0.1 °C).
Expect cooler weather in the next days in Wales with the forecast suggesting a temperature of 21.4 °C, lower than the historical average.
In general, the average temperature in Wales at the beginning of September is 19.9 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 22.6 °C by the end of September.
Wales in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 114.1 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
17°/11°
Temperatures
24 km/h
Avg max wind
81 %
Avg humidity
Wales Weather September
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What’s the Weather Like in Wales This September?
Discover the average temperatures and weather trends across Wales’s cities this September.
Temperatures trend during September in Wales
See the weather trend as well as the moving average line
September weather in Wales day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 19° /12° | 3 mm | 4 | |
| 2 Sept. |  Partly cloudy | 20° /12° | 3 mm | 4 | |
| 3 Sept. | Light rain shower | 20° /13° | 6 mm | 4 | |
| 4 Sept. |  Sunny | 19° /12° | 1.8 mm | 4 | |
| 5 Sept. | Sunny | 19° /11° | 5.4 mm | 5 | |
| 6 Sept. |  Overcast | 22° /13° | 2.2 mm | 4 | |
| 7 Sept. | Patchy rain possible | 20° /14° | 1.6 mm | 4 | |
| 8 Sept. | Light rain shower | 20° /13° | 10.1 mm | 4 | |
| 9 Sept. | Sunny | 19° /12° | 1.4 mm | 5 | |
| 10 Sept. | Partly cloudy | 18° /11° | 3.8 mm | 4 | |
| 11 Sept. | Patchy rain possible | 18° /11° | 2 mm | 4 | |
| 12 Sept. | Light rain shower | 16° /9° | 2.8 mm | 3 | |
| 13 Sept. |  Cloudy | 16° /10° | 4 mm | 3 | |
| 14 Sept. | Overcast | 17° /11° | 7.3 mm | 4 | |
| 15 Sept. | Sunny | 18° /11° | 1.5 mm | 4 | |
| 16 Sept. | Patchy rain possible | 18° /11° | 0.5 mm | 4 | |
| 17 Sept. | Light rain shower | 18° /11° | 6.5 mm | 4 | |
| 18 Sept. |  Light drizzle | 19° /12° | 1.4 mm | 4 | |
| 19 Sept. | Light rain shower | 20° /13° | 2 mm | 5 | |
| 20 Sept. | Overcast | 18° /10° | 0 mm | 2.6 | |
| 21 Sept. | Sunny | 22° /10° | 0 mm | 4 | |
| 22 Sept. | Sunny | 23° /14° | 0 mm | 3.8 | |
| 23 Sept. | Overcast | 21° /10° | 0 mm | 3.4 | |
| 24 Sept. | Sunny | 20° /8° | 0 mm | 6 | |
| 25 Sept. | Sunny | 21° /10° | 0 mm | 6 | |
| 26 Sept. | Overcast | 26° /10° | 0 mm | 7 | |
| 27 Sept. | Overcast | 22° /13° | 0 mm | 5 | |
| 28 Sept. | Sunny | 25° /13° | 0 mm | 6 | |
| 29 Sept. | Sunny | 25° /12° | 0 mm | 7 | |
| 30 Sept. | Overcast | 19° /15° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Wales in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Wales forecast closer to your planned date for the most up-to-date weather information.
Change Month
Wales in September - FAQ
What are the expected maximum and minimum temperatures in Wales during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Wales during September?
Significant rainfall exceeding 114.1 mm is expected in Wales during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Wales during September?
The average wind speed in Wales during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Wales
Explore the daily rainfall trends and prepare for Waless September weather 💧
Typically, Wales has 16 rainy days in September with a total of 114.1 mm of rainfall.
UV exposure in Wales during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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