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United Kingdom weather

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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Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/8°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
83 %
Avg humidity

Cardiff in May average weather

Move between months or click on a day
April
June
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
16°
2
Patchy rain possible
13°
3
Partly cloudy
13°
4
Moderate or heavy rain shower
14°
5
Moderate or heavy rain shower
14°
6
Moderate or heavy rain shower
15°
7
Overcast
15°
8
Moderate or heavy rain shower
15°
9
Heavy rain at times
16°
10
Moderate rain at times
16°
11
Heavy rain at times
17°
12
Patchy rain possible
16°
13
Cloudy
17°
14
Overcast
16°
15
Overcast
14°
16
Overcast
15°
17
Patchy rain possible
16°
18
Overcast
16°
19
Heavy rain at times
17°
20
Partly cloudy
17°
21
Overcast
16°
22
Patchy rain possible
18°
23
Patchy rain possible
14°
24
Partly cloudy
17°
25
Cloudy
17°
26
Cloudy
16°
27
Sunny
17°
28
Overcast
16°
29
Partly cloudy
16°
30
Partly cloudy
18°
31
Patchy rain possible
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

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Patchy rain possible
Patchy rain possible
 16° /7° 4 mm 4
2 May Patchy rain possible
Patchy rain possible
 13° /8° 16.2 mm 3
3 May Partly cloudy
Partly cloudy
 13° /6° 0.9 mm 4
4 May Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /6° 6.1 mm 3
5 May Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /8° 4.6 mm 4
6 May Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /9° 7.1 mm 4
7 May Overcast
Overcast
 15° /9° 0 mm 4
8 May Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /10° 9.3 mm 4
9 May Heavy rain at times
Heavy rain at times
 16° /9° 1.2 mm 5
10 May Moderate rain at times
Moderate rain at times
 16° /10° 0.8 mm 4
11 May Heavy rain at times
Heavy rain at times
 17° /9° 1.7 mm 4
12 May Patchy rain possible
Patchy rain possible
 16° /9° 3.3 mm 4
13 May Cloudy
Cloudy
 17° /8° 6.9 mm 4
14 May Overcast
Overcast
 16° /9° 2 mm 4
15 May Overcast
Overcast
 14° /8° 1.1 mm 4
16 May Overcast
Overcast
 15° /7° 3.1 mm 4
17 May Patchy rain possible
Patchy rain possible
 16° /8° 0.4 mm 4
18 May Overcast
Overcast
 16° /10° 1.4 mm 4
19 May Heavy rain at times
Heavy rain at times
 17° /9° 1.8 mm 4
20 May Partly cloudy
Partly cloudy
 17° /8° 0 mm 5
21 May Overcast
Overcast
 16° /7° 4.3 mm 4
22 May Patchy rain possible
Patchy rain possible
 18° /8° 0.6 mm 5
23 May Patchy rain possible
Patchy rain possible
 14° /8° 0.2 mm 4
24 May Partly cloudy
Partly cloudy
 17° /8° 0.1 mm 4
25 May Cloudy
Cloudy
 17° /7° 4.7 mm 4
26 May Cloudy
Cloudy
 16° /9° 2.2 mm 4
27 May Sunny
Sunny
 17° /8° 0.5 mm 5
28 May Overcast
Overcast
 16° /10° 3.7 mm 4
29 May Partly cloudy
Partly cloudy
 16° /8° 0.3 mm 5
30 May Partly cloudy
Partly cloudy
 18° /8° 0.8 mm 5
31 May Patchy rain possible
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.

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Get accurate weather forecasts for Cardiff, located at latitude 51.48 and longitude -3.18. Stay updated with localized weather information tailored for Cardiff.

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