Wales (Cardiff)
September
Weather in Wales for September 2025
Your guide to Wales weather in September - trends and predictions
In general, the average temperature in Wales at the beginning of September is 20.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.7 °C by the end of September.
Wales in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 101.4 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
12
Dry days
18
Rainy days
0
Snow days
18°/12°
Temperatures
23 km/h
Avg max wind
81 %
Avg humidity
Wales Weather September
Move between months or click on a day
Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
---|---|---|---|---|---|---|
1 20° | 2 20° | 3 20° | 4 20° | 5 20° | 6 21° | 7 22° |
8 21° | 9 21° | 10 19° | 11 17° | 12 15° | 13 16° | 14 16° |
15 19° | 16 18° | 17 18° | 18 19° | 19 20° | 20 19° | 21 18° |
22 17° | 23 16° | 24 17° | 25 16° | 26 16° | 27 15° | 28 15° |
29 15° | 30 16° |
You can click on date
Access Wales weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Wales
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
Date | Weather | Temperatures | Rain | UV | More |
---|---|---|---|---|---|
1 Sept. | Light rain shower | 20° /13° | 2.5 mm | 5 | |
2 Sept. | Partly cloudy | 20° /12° | 0.3 mm | 5 | |
3 Sept. | Partly cloudy | 20° /13° | 1 mm | 5 | |
4 Sept. | Sunny | 20° /13° | 0.1 mm | 5 | |
5 Sept. | Sunny | 20° /13° | 10.8 mm | 5 | |
6 Sept. | Partly cloudy | 21° /15° | 4.4 mm | 5 | |
7 Sept. | Sunny | 22° /15° | 0.2 mm | 5 | |
8 Sept. | Partly cloudy | 21° /15° | 10.5 mm | 5 | |
9 Sept. | Sunny | 21° /13° | 0.7 mm | 6 | |
10 Sept. | Partly cloudy | 19° /12° | 0.9 mm | 5 | |
11 Sept. | Patchy rain possible | 17° /11° | 0.2 mm | 4 | |
12 Sept. | Mist | 15° /9° | 0.5 mm | 4 | |
13 Sept. | Cloudy | 16° /8° | 0 mm | 4 | |
14 Sept. | Overcast | 16° /10° | 0 mm | 5 | |
15 Sept. | Sunny | 19° /10° | 0 mm | 5 | |
16 Sept. | Light rain shower | 18° /11° | 0.7 mm | 5 | |
17 Sept. | Light rain shower | 18° /11° | 5.8 mm | 5 | |
18 Sept. | Light drizzle | 19° /12° | 0.8 mm | 5 | |
19 Sept. | Light rain shower | 20° /13° | 2.9 mm | 5 | |
20 Sept. | Light rain shower | 19° /12° | 10.2 mm | 5 | |
21 Sept. | Light rain shower | 18° /10° | 6.3 mm | 5 | |
22 Sept. | Light rain shower | 17° /10° | 4.5 mm | 4 | |
23 Sept. | Patchy rain possible | 16° /10° | 1.1 mm | 4 | |
24 Sept. | Light rain shower | 17° /12° | 5.4 mm | 4 | |
25 Sept. | Patchy rain possible | 16° /11° | 4.2 mm | 4 | |
26 Sept. | Light rain shower | 16° /11° | 6 mm | 4 | |
27 Sept. | Light rain shower | 15° /9° | 5.7 mm | 4 | |
28 Sept. | Light rain | 15° /9° | 2.8 mm | 4 | |
29 Sept. | Partly cloudy | 15° /9° | 8.4 mm | 4 | |
30 Sept. | Patchy rain possible | 16° /10° | 4.5 mm | 4 | |
Next |
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.
Wales in September - FAQ
What are the expected maximum and minimum temperatures in Wales during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 12°. 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 101.4 mm is expected in Wales during September, occurring over more than 18 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 23 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 💧
UV exposure in Wales during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Wales
Select a province for an accurate weather forecast
Top locations in Wales
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Get accurate weather forecasts for Wales, located at latitude 51.48 and longitude -3.18. Stay updated with localized weather information tailored for Wales.
Found a mistake?
We appreciate your attention to details. Tell us here.