Which is the hottest month in Cardiff?

The hottest time of year in Cardiff is normally July. Expect maximum daytime temperatures to reach 20°C.

Which month has the most rain in Cardiff?

In terms of rainfall, December is usually the wettest month in Cardiff with 109mm on average. There are normally 19 days in December with some rain.

When is it sunniest in Cardiff?

The sunniest time of year in Cardiff is normally August with bright sunshine on average for 41% of daylight hours; that's 6 hours of sunshine per day.

When is the sea warmest in Cardiff?

The sea is usually at its warmest in Cardiff in August when the water temperature reaches 18°C.

Best time to visit Cardiff

Q: When is the best time to visit Cardiff?

The best time to visit Cardiff is June, July and August based on the following average weather conditions. Maximum daytime temperature = 22 - 30°C. Daily hours of sunshine = 10 hours or more.

Find the best time to visit Cardiff and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Cardiff by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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When is the best time to visit Cardiff?

The best time to visit Cardiff is June, July and August based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

Change the criteria to reflect your weather preferences.

0
Jan
0
Feb
0.5
Mar
1
Apr
1.5
May
3
Jun
3
Jul
3
Aug
1.5
Sep
0
Oct
0
Nov
0
Dec

Change criteria

Max Day Temperature (°C)

7
Jan
7
Feb
10
Mar
12
Apr
16
May
19
Jun
20
Jul
20
Aug
18
Sep
14
Oct
10
Nov
8
Dec

Hours of Sunshine (daily)

2
Jan
3
Feb
4
Mar
5
Apr
6
May
7
Jun
6
Jul
6
Aug
5
Sep
3
Oct
2
Nov
2
Dec

Best time to visit

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

The weather guide for Wales (Cardiff) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)