Cardiff
August
Weather in Cardiff for August 2025
Your guide to Cardiff weather in August - trends and predictions
In general, the average temperature in Cardiff at the beginning of August is 19 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 18.1 °C by the end of August.
Cardiff experiences an exceptionally high level of rainfall in August, with more than 20 rainy days on average.
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10
Dry days
21
Rainy days
0
Snow days
19°/13°
Temperatures
23 km/h
Avg max wind
82 %
Avg humidity
Cardiff in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2 20° | 3  19° | ||||
| 4  18° | 5 20° | 6  18° | 7  18° | 8 18° | 9 20° | 10 22° |
| 11 23° | 12 20° | 13 20° | 14 19° | 15 21° | 16  20° | 17 20° |
| 18 20° | 19 19° | 20 19° | 21 19° | 22 19° | 23 19° | 24 19° |
| 25 17° | 26 18° | 27 19° | 28 18° | 29 19° | 30 18° | 31 18° |
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Temperatures trend during August in Cardiff
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. | Moderate rain at times | 20° /13° | 2 mm | 5 | |
| 2 Aug. | Moderate or heavy rain shower | 20° /13° | 7.5 mm | 5 | |
| 3 Aug. | Heavy rain at times | 19° /13° | 1.3 mm | 4 | |
| 4 Aug. | Overcast | 18° /11° | 0 mm | 4 | |
| 5 Aug. | Moderate or heavy rain shower | 20° /12° | 10.4 mm | 5 | |
| 6 Aug. | Patchy rain possible | 18° /11° | 2.6 mm | 4 | |
| 7 Aug. | Cloudy | 18° /11° | 0.6 mm | 4 | |
| 8 Aug. | Moderate rain at times | 18° /12° | 4.1 mm | 4 | |
| 9 Aug. | Cloudy | 20° /13° | 0.1 mm | 5 | |
| 10 Aug. | Patchy rain possible | 22° /14° | 0.4 mm | 5 | |
| 11 Aug. | Patchy rain possible | 23° /14° | 0.3 mm | 6 | |
| 12 Aug. | Heavy rain at times | 20° /13° | 3.3 mm | 5 | |
| 13 Aug. | Patchy rain possible | 20° /13° | 1 mm | 5 | |
| 14 Aug. | Moderate or heavy rain shower | 19° /12° | 12.7 mm | 4 | |
| 15 Aug. | Patchy rain possible | 21° /12° | 1.7 mm | 5 | |
| 16 Aug. | Partly cloudy | 20° /11° | 0.1 mm | 6 | |
| 17 Aug. | Patchy rain possible | 20° /12° | 0.1 mm | 5 | |
| 18 Aug. | Moderate rain at times | 20° /14° | 6.2 mm | 5 | |
| 19 Aug. | Patchy rain possible | 19° /13° | 7.6 mm | 5 | |
| 20 Aug. | Patchy rain possible | 19° /13° | 0.8 mm | 5 | |
| 21 Aug. | Patchy rain possible | 19° /12° | 0.5 mm | 5 | |
| 22 Aug. | Patchy rain possible | 19° /14° | 1 mm | 4 | |
| 23 Aug. | Patchy rain possible | 19° /14° | 3.2 mm | 5 | |
| 24 Aug. | Cloudy | 19° /11° | 6.6 mm | 5 | |
| 25 Aug. | Light rain shower | 17° /10° | 1.6 mm | 4 | |
| 26 Aug. | Light rain shower | 18° /11° | 1.7 mm | 5 | |
| 27 Aug. | Patchy rain possible | 19° /11° | 0.2 mm | 5 | |
| 28 Aug. | Partly cloudy | 18° /12° | 0.9 mm | 5 | |
| 29 Aug. | Patchy rain possible | 19° /11° | 0.1 mm | 4 | |
| 30 Aug. | Patchy rain possible | 18° /9° | 0.2 mm | 5 | |
| 31 Aug. | Light rain shower | 18° /11° | 1.5 mm | 5 | |
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Important Notice
Our weather forecast for Cardiff in August 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 Cardiff forecast closer to your planned date for the most up-to-date weather information.
Cardiff in August - FAQ
What are the expected maximum and minimum temperatures in Cardiff during August?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Cardiff during August?
Significant rainfall exceeding 102.7 mm is expected in Cardiff during August, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cardiff during August?
The average wind speed in Cardiff during August is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
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