Which is the hottest month in Caernarfon?

The hottest time of year in Caernarfon is normally July. Expect maximum daytime temperatures to reach 18°C.

Which month has the most rain in Caernarfon?

In terms of rainfall, December is usually the wettest month in Caernarfon with 183mm on average. There are normally 20 days in December with some rain.

When is it sunniest in Caernarfon?

The sunniest time of year in Caernarfon is normally May with bright sunshine on average for 40% of daylight hours; that's 6 hours of sunshine per day.

When is the sea warmest in Caernarfon?

The sea is usually at its warmest in Caernarfon in August when the water temperature reaches 16°C.

Best time to visit Caernarfon

Q: When is the best time to visit Caernarfon?

The best time to visit Caernarfon is July and August based on the following average weather conditions. Maximum daytime temperature = 22 - 30°C.

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

Caernarfon by month

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

Recommended for Wales

Rural Retreats: Special offers on cottage holidays

Sale

Save on holiday cottages in the UK & Ireland
Browse latest special offers on hand-picked cottages
Filter offers by facilities, activities & location

Go to Rural Retreats deal >>

View all Rural Retreats offers

When is the best time to visit Caernarfon?

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

Maximum daytime temperature = 22 - 30°C [remove]

Change the criteria to reflect your weather preferences.

0
Jan
0
Feb
0
Mar
0
Apr
0
May
1
Jun
2
Jul
2
Aug
0
Sep
0
Oct
0
Nov
0
Dec

Change criteria

Max Day Temperature (°C)

7
Jan
7
Feb
8
Mar
11
Apr
14
May
17
Jun
18
Jul
18
Aug
16
Sep
14
Oct
10
Nov
8
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 (Caernarfon) 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)