Caerphilly
September
Weather in Caerphilly for September 2026
Your guide to Caerphilly weather in September - trends and predictions
So far, September 2026 in Caerphilly is slightly warmer than the historical average by 0.8 °C.
The forecast for the next days in Caerphilly predicts temperatures to be around 22 °C, close to the historical average.
In general, the average temperature in Caerphilly at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 23.6 °C by the end of September.
Caerphilly in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 139 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
13
Dry days
17
Rainy days
0
Snow days
16°/9°
Temperatures
25 km/h
Avg max wind
83 %
Avg humidity
Caerphilly Weather September
Move between months or click on a day
Temperatures trend during September in Caerphilly
See the weather trend as well as the moving average line
September weather in Caerphilly day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 18° /11° | 3.3 mm | 2 | |
| 2 Sept. |  Moderate rain | 18° /12° | 4.4 mm | 2 | |
| 3 Sept. | Light rain shower | 19° /14° | 11.5 mm | 1 | |
| 4 Sept. | Light rain shower | 18° /12° | 3 mm | 3 | |
| 5 Sept. | Patchy rain possible | 18° /10° | 0 mm | 4 | |
| 6 Sept. |  Mist | 22° /12° | 0.1 mm | 3 | |
| 7 Sept. | Light rain shower | 18° /11° | 3.3 mm | 2 | |
| 8 Sept. | Patchy rain possible | 17° /10° | 9.2 mm | 3 | |
| 9 Sept. | Light rain shower | 17° /10° | 1.5 mm | 3 | |
| 10 Sept. | Light rain shower | 17° /10° | 8.2 mm | 1 | |
| 11 Sept. | Light rain shower | 17° /11° | 3 mm | 3 | |
| 12 Sept. | Light rain shower | 17° /9° | 4.7 mm | 1 | |
| 13 Sept. | Light rain shower | 16° /12° | 8.8 mm | 1 | |
| 14 Sept. | Light rain shower | 18° /12° | 18.9 mm | 2 | |
| 15 Sept. | Light rain shower | 16° /11° | 2.6 mm | 2 | |
| 16 Sept. | Patchy rain possible | 16° /10° | 0.3 mm | 2 | |
| 17 Sept. |  Light rain | 16° /11° | 6.8 mm | 2 | |
| 18 Sept. | Patchy rain possible | 18° /12° | 2.4 mm | 1 | |
| 19 Sept. | Patchy rain possible | 19° /15° | 1.1 mm | 2.3 | |
| 20 Sept. |  Overcast | 18° /12° | 0 mm | 1.4 | |
| 21 Sept. |  Sunny | 22° /12° | 0 mm | 3.9 | |
| 22 Sept. | Sunny | 22° /15° | 0 mm | 6 | |
| 23 Sept. | Overcast | 21° /14° | 0 mm | 5 | |
| 24 Sept. | Overcast | 23° /14° | 0 mm | 6 | |
| 25 Sept. | Sunny | 25° /14° | 0 mm | 6 | |
| 26 Sept. | Sunny | 25° /14° | 0 mm | 7 | |
| 27 Sept. | Overcast | 24° /14° | 0 mm | 6 | |
| 28 Sept. | Sunny | 24° /14° | 0 mm | 6 | |
| 29 Sept. | Sunny | 25° /13° | 0 mm | 6 | |
| 30 Sept. | Overcast | 19° /16° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Caerphilly 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 Caerphilly forecast closer to your planned date for the most up-to-date weather information.
Change Month
Caerphilly in September - FAQ
What are the expected maximum and minimum temperatures in Caerphilly during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Caerphilly during September?
Significant rainfall exceeding 139 mm is expected in Caerphilly during September, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Caerphilly during September?
The average wind speed in Caerphilly during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Caerphilly
Explore the daily rainfall trends and prepare for Caerphillys September weather 💧
Typically, Caerphilly has 17 rainy days in September with a total of 139 mm of rainfall.
UV exposure in Caerphilly during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Caerphilly weather pages
You are here
Where is Caerphilly?Get accurate weather forecasts for Caerphilly, located at latitude 51.575 and longitude -3.218. Stay updated with localized weather information tailored for Caerphilly.
Found a mistake?
We appreciate your attention to details. Tell us here.