Wales Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Wales, the United Kingdom in September.

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Cardiff Swansea

Planning a journey to Wales, the United Kingdom this September and curious over the weather conditions to await? Your essential details are found on this page, answering your query:

What to Expect in Wales in September

Wales, the United Kingdom is a region in the United Kingdom. September in Wales generally has pleasant temperatures, with precipitation levels ranging from moderate to high. September is a summer month.

Temperatures

You can expect pleasant maximum daytime temperatures of around 18°C (64°F) and nighttime temperatures around 12°C (54°F) in Cardiff.

For a closer look at conditions across Wales, the United Kingdom, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Cardiff with an average of 90 mm (3.5 in) to high rainfall in Swansea with 103 mm (4.1 in).

Average sunshine

Sunshine amounts are decent in most places. Cardiff gets approximately 149 hours of sunlight in September, offering a reasonable amount of both bright and cloudy periods. Curious about sunnier destinations? Our weather planner makes it easy to find places worldwide with pleasant weather.

Explore Wales by month

Pick a month to see the average temperature, rainfall and sunshine in Wales — and find the best time to visit. (based on Cardiff)

January9°C (48°F) February9°C (48°F) March11°C (52°F) April13°C (55°F) May16°C (61°F) June18°C (64°F) This monthJuly20°C (68°F) August20°C (68°F) September18°C (64°F) October15°C (59°F) November12°C (54°F) December10°C (50°F)
Best Time to Visit Wales →

Best Places to Visit in Wales in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Wales.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Wales

What is the weather like in September for some of the most popular destinations in Wales, the United Kingdom?

Temperature range in Wales (September)

Precipitation variation in Wales (September)

Cardiff

In September Cardiff generally has pleasant temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
18°C (64°F)
15°C (59°F)
Min temperature
14°C (57°F)
12°C (54°F)
10°C (50°F)
Monthly sun hours
184 hours
149 hours
102 hours
Monthly rainfall
98 mm (3.9 in)
90 mm (3.5 in)
119 mm (4.7 in)
Monthly rainy days
15 days
16 days
18 days
Weather conditions
perfect
pleasant
unpleasant
Climate in Cardiff →

Swansea

In September Swansea generally has pleasant temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 12°C (54°F) and high monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
18°C (64°F)
15°C (59°F)
Min temperature
14°C (57°F)
12°C (54°F)
9°C (48°F)
Monthly sun hours
184 hours
149 hours
102 hours
Monthly rainfall
109 mm (4.3 in)
103 mm (4.1 in)
141 mm (5.6 in)
Monthly rainy days
16 days
16 days
19 days
Weather conditions
pleasant
tolerable
unpleasant
Climate in Swansea →

Is your destination not in the list? Have a look at all destinations in Wales, in the United Kingdom.

Popular cities in September

Day & night temperatures, rainfall and average weather in Wales in September.

City Weather Day temp Night temp Rainfall
Cardiff 18°C (64°F) 12°C (54°F) 90 mm (3.5 in)
Swansea 18°C (64°F) 12°C (54°F) 103 mm (4.1 in)

Wales weather in September: frequently asked questions

What is the weather like in Wales, the United Kingdom in September?

September in Wales, the United Kingdom brings pleasant weather. In Cardiff, daytime temperatures are typically around 18°C (64°F) and nighttime lows hover near 12°C (54°F).

What is the average temperature in Wales, the United Kingdom in September?

Daytime temperatures in Cardiff peak at roughly 18°C (64°F) in September, dropping to about 12°C (54°F) overnight.

Does Wales, the United Kingdom get a lot of rain in September?

Not particularly. Cardiff averages just 90 mm (3.5 in) of rain in September, making it a mostly dry month for Wales, the United Kingdom.

Is September a Good Time to Visit Wales, the United Kingdom?

Given the typically pleasant weather conditions in Cardiff, September might be a good time to visit Wales, the United Kingdom. It's worth noting that weather conditions might differ depending on the location you visit.

On average, the best time to visit Wales, the United Kingdom is in July and August with generally perfect weather in Cardiff. On the other hand, the weather in January, February, November and December tend to be poor.

Interested in more climate information?

We have much more information about the climate in Wales.

Weather and climate has detailed information for every country in the world. Are you going to the United Kingdom? Get detailed historical weather averages for many cities in the United Kingdom.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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