Cardiff
May
Weather in Cardiff for May 2025
Your guide to Cardiff weather in May - trends and predictions
In general, the average temperature in Cardiff at the beginning of May is 14.3 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 16.6 °C by the end of May.
Cardiff sees moderate rainfall in May, averaging 10 rainy days.
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21
Dry days
10
Rainy days
0
Snow days
17°/8°
Temperatures
20 km/h
Avg max wind
83 %
Avg humidity
Cardiff in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 13° | 3  13° | 4  14° | |||
| 5 14° | 6 15° | 7  15° | 8 15° | 9  16° | 10 16° | 11 17° |
| 12 16° | 13  17° | 14 16° | 15 14° | 16 15° | 17 16° | 18 16° |
| 19 17° | 20 17° | 21 16° | 22 18° | 23 14° | 24 17° | 25 17° |
| 26 16° | 27  17° | 28 16° | 29 16° | 30 18° | 31 16° |
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Temperatures trend during May in Cardiff
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May | Patchy rain possible | 16° /7° | 4 mm | 4 | |
| 2 May | Patchy rain possible | 13° /8° | 16.2 mm | 3 | |
| 3 May | Partly cloudy | 13° /6° | 0.9 mm | 4 | |
| 4 May | Moderate or heavy rain shower | 14° /6° | 6.1 mm | 3 | |
| 5 May | Moderate or heavy rain shower | 14° /8° | 4.6 mm | 4 | |
| 6 May | Moderate or heavy rain shower | 15° /9° | 7.1 mm | 4 | |
| 7 May | Overcast | 15° /9° | 0 mm | 4 | |
| 8 May | Moderate or heavy rain shower | 15° /10° | 9.3 mm | 4 | |
| 9 May | Heavy rain at times | 16° /9° | 1.2 mm | 5 | |
| 10 May | Moderate rain at times | 16° /10° | 0.8 mm | 4 | |
| 11 May | Heavy rain at times | 17° /9° | 1.7 mm | 4 | |
| 12 May | Patchy rain possible | 16° /9° | 3.3 mm | 4 | |
| 13 May | Cloudy | 17° /8° | 6.9 mm | 4 | |
| 14 May | Overcast | 16° /9° | 2 mm | 4 | |
| 15 May | Overcast | 14° /8° | 1.1 mm | 4 | |
| 16 May | Overcast | 15° /7° | 3.1 mm | 4 | |
| 17 May | Patchy rain possible | 16° /8° | 0.4 mm | 4 | |
| 18 May | Overcast | 16° /10° | 1.4 mm | 4 | |
| 19 May | Heavy rain at times | 17° /9° | 1.8 mm | 4 | |
| 20 May | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 21 May | Overcast | 16° /7° | 4.3 mm | 4 | |
| 22 May | Patchy rain possible | 18° /8° | 0.6 mm | 5 | |
| 23 May | Patchy rain possible | 14° /8° | 0.2 mm | 4 | |
| 24 May | Partly cloudy | 17° /8° | 0.1 mm | 4 | |
| 25 May | Cloudy | 17° /7° | 4.7 mm | 4 | |
| 26 May | Cloudy | 16° /9° | 2.2 mm | 4 | |
| 27 May | Sunny | 17° /8° | 0.5 mm | 5 | |
| 28 May | Overcast | 16° /10° | 3.7 mm | 4 | |
| 29 May | Partly cloudy | 16° /8° | 0.3 mm | 5 | |
| 30 May | Partly cloudy | 18° /8° | 0.8 mm | 5 | |
| 31 May | Patchy rain possible | 16° /9° | 0.7 mm | 4 | |
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Important Notice
Our weather forecast for Cardiff in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Cardiff during May?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Cardiff during May?
Significant rainfall exceeding 154.4 mm is expected in Cardiff during May, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cardiff during May?
The average wind speed in Cardiff during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Cardiff
Explore the daily rainfall trends and prepare for Cardiffs May weather 💧
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