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Cardiff in May 2027: weather, temperatures and activities

Do you want to visit Cardiff in May 2027? Discover the usual weather at this time of year, average temperatures, the risk of rain, possible activities, and our opinion on whether May is a good month to travel to Cardiff, Wales.

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Is it worth visiting Cardiff in May?

Check your ideal travel criteria and see if the month of May suits your plans to go to Cardiff.
What matters most?
Cardiff in May 2027: weather, temperatures and activities

Page summary

Cardiff in May in summary
Fair weather
Min 10°C Max 15°C 58 mm 4 day(s) 88% 47% 12°C 12.7 h/day
Best activities in May
Beach and swimmingCultural visits and heritageFamily and attractionsNature and landscapesNightlifeGastronomyBoat trip and cruise
Practical guidelines
High crowding Moderate prices 04:21 19:58
Hourly weather

Average weather in Cardiff in May 2027

Fair weather

The weather in Cardiff in May 2027 is based on statistical data from previous years in May. This allows you to forecast the weather in May 2027. Check the hourly statistics (6:00, 9:00, 12:00, 15:00, 18:00, 21:00, 0:00 and 3:00), with the associated average temperature, for the whole month, and also, by navigating the tabs, for the beginning, middle and end of the month.

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Climate

Climate of Cardiff in May

Temperatures, precipitation and monthly trends help to better understand the climate in Cardiff in May.

Temperatures and rain in Cardiff in May

Average daily weather

Temperatures and rain day by day in May.
Minimal Average Maximums Average rainfall

Monthly temperatures

The month of May is highlighted to compare it quickly with the rest of the year.
Minimal Average Maximums

Monthly precipitation

The bar for the month under study is highlighted.
Average rainfall

About the climate in Cardiff in May

Seasonal normals

Seasonal normals of Cardiff in May

Check the seasonal normals in Cardiff in May and compare the weather with the previous month and the following month (or the months of your choice by selecting months in the form below): temperatures, wind, rain, humidity, climate rating...

Last updated: 12/01/2026
Reference period for normals: January 2009 - December 2025
Month analyzed
May
Weather data April May June
Outside temperature
Average temperature 9.3°C 12.2°C 15.2°C
Maximum temperature 12.5°C 14.9°C 17.6°C
Minimum temperature 6.2°C 9.6°C 12.7°C
Record maximum temperature 21.0°C
(2011)
24.0°C
(2010)
26.0°C
(2018)
Record low temperature -3.0°C
(2013)
3.0°C
(2011)
7.0°C
(2012)
Number of days at +30° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Number of days at +18° 2 day(s)
(7%)
5 day(s)
(16%)
14 day(s)
(47%)
Number of days below 0° 1 day(s)
(3%)
0 day(s)
(0%)
0 day(s)
(0%)
Sea temperature
Sea temperature (average) 9.9°C 11.2°C 13.6°C
Sea temperature (minimum) 8.4°C 10.3°C 11.7°C
Sea temperature (maximum) 11.3°C 12.4°C 15.1°C
Wind
Wind speed 21 km/h 21 km/h 20 km/h
Wind temperature 3.4°C 7.6°C 11.6°C
Precipitation (rain)
Precipitation 30.5 mm 57.6 mm 59.2 mm
Number of days with precipitation 11 day(s)
(37%)
15 day(s)
(48%)
15 day(s)
(50%)
Number of days with significant precipitation (greater than 5 mm) 2 day(s)
(6%)
4 day(s)
(11%)
3 day(s)
(11%)
Record precipitation in one day 11.9 mm
(2012)
28.1 mm
(2021)
29.5 mm
(2009)
Other weather data
Humidity 88% 88% 89%
Visibility 9.3 km 9.2 km 9.2 km
Cloud cover 45% 47% 49%
UV index 3 4 4
Daily sunshine 12h 13h 13h
Sunrise and sunset
Sunrise time 05h17 04h21 03h55
Sunset time 19h10 19h58 20h31
Day length 13h53 15h37 16h36
Our opinion on the climate in May
The review of Where And When fair weather fair weather favourable weather
Activities and events

What to do in Cardiff in May?

Best activities in May
Beach and swimmingCultural visits and heritageFamily and attractionsNature and landscapesNightlifeGastronomyBoat trip and cruise
Prices monitored continuously

The best offers right now to Cardiff

Each map is a real return flight offered from London, with its dates, airline and price. Choose one to find it on Skyscanner, or start your own search just below.

The cheapest

London Cardiff

From 13 May to 17 May 2027

£154 per person
4 days on site With stopover(s) Ryanair
The cheapest

London Cardiff

From 26 May to 31 May 2027

£210 per person
5 days on site With stopover(s) Ryanair
The cheapest

London Cardiff

From 27 May to 31 May 2027

£212 per person
4 days on site With stopover(s) Ryanair
Searching for the best deals…

Round-trip prices per person, recently collected from Skyscanner. Each offer has its own collection date and fares change constantly: the price displayed on Skyscanner is authoritative.

Observed weather

What was the weather like in Cardiff in May last?

Find the observed weather calendar in Cardiff in May 2025, with each day’s weather, temperatures and precipitation.

Mon. Tue. Wed. Thu. Fri. Sat. Sun.
1
Partly Cloudy
12°C26°C0.0 mm
2
Clear/Sunny
11°C21°C0.0 mm
3
Clear/Sunny
9°C17°C0.0 mm
4
Patchy rain nearby
7°C13°C0.1 mm
5
Overcast
5°C13°C0.0 mm
6
Clear/Sunny
5°C14°C0.0 mm
7
Overcast
8°C17°C0.0 mm
8
Clear/Sunny
7°C15°C0.0 mm
9
Overcast
7°C18°C0.0 mm
10
Partly Cloudy
8°C21°C0.0 mm
11
Overcast
10°C21°C0.0 mm
12
Overcast
12°C17°C1.1 mm
13
Cloudy
11°C17°C2.2 mm
14
Clear/Sunny
9°C19°C0.0 mm
15
Clear/Sunny
8°C18°C0.0 mm
16
Clear/Sunny
8°C19°C0.0 mm
17
Clear/Sunny
8°C17°C0.0 mm
18
Clear/Sunny
9°C19°C0.0 mm
19
Cloudy
9°C16°C0.0 mm
20
Patchy rain nearby
10°C18°C0.1 mm
21
Overcast
12°C19°C2.0 mm
22
Cloudy
10°C19°C0.0 mm
23
Partly Cloudy
10°C17°C0.0 mm
24
Patchy rain nearby
14°C17°C6.2 mm
25
Patchy rain nearby
12°C14°C0.3 mm
26
Light drizzle
11°C14°C1.0 mm
27
Light rain
12°C15°C3.0 mm
28
Patchy rain nearby
13°C16°C0.2 mm
29
Patchy rain nearby
16°C18°C0.0 mm
30
Patchy rain nearby
15°C17°C0.0 mm
31
Patchy rain nearby
14°C18°C0.1 mm
Nearby

Where to go near Cardiff in May?

Compare cities and destinations near Cardiff in May to find another travel stop, a nearby alternative or a logical continuation of your stay in Cardiff.

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Every month

Best time to visit Cardiff month by month

Compare the weather in Cardiff across all months of the year and open each detailed page to find the best time.

Frequently asked questions

Travel to to Cardiff in May: your frequently asked questions

Short answers to the questions we ask ourselves before booking for this month.

It's an average period, nothing special. Conditions are mediocre in Cardiff in May, which ranks this month 6th out of 12. The choice of region will make a real difference.

Expect an average of 15°C during the day and 10°C at night, with about 58 mm of precipitation spread over 4 rainy days.

The sea is only 11°C on average in May. Swimming is still possible, but it will be cool.

Expect about 12.7 hours of sunshine per day on average for this month.

This month is particularly suited to these activities: Beach and swimming, Cultural visits and heritage, Family and attractions and Nature and landscapes. These are the ones for which the conditions on site are most favourable.

Visitor numbers are moderate: this month is in High crowding, with an index of 51/100. It is often a good compromise between weather and tranquility.

Prices are average: level Moderate prices, with an index of 47/100, including flights and accommodation.

If your dates are flexible, the most favorable months in Cardiff are: June, July, August and September. Compare them before finalizing your departure.
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