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Weather in September in Gwynedd

Are you planning a trip a to Gwynedd in September and wondering what kind of weather to expect? This page has all the details you need.

What is the weather like in Gwynedd in September?

Gwynedd is a region in the United Kingdom. September in Gwynedd generally has mild temperatures, with precipitation levels ranging from moderate to high.

Temperatures

You can expect mild maximum daytime temperatures of around 18°C and nighttime temperatures around 11°C in Llandudno. To learn more about the conditions in specific areas of Gwynedd in September, check out the map below.

To explore the conditions in Gwynedd in more detail, check the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Llandrillo with an average of 81 mm to high rainfall in Pistyll with 145 mm.

Average sunshine

Most cities enjoy a balanced amount of sunshine, with around 111 hours of sunlight anticipated in Llandudno. This ensures the days are neither too dim nor excessively sunny.

For a more detailed look at Gwynedd's conditions throughout the year, check out our Gwynedd climate page.

Where to go in Gwynedd in September

Find more information for the most popular destinations in the Gwynedd on the map below. Click on a destination dot for more details.

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MarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarkerMarker
Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Select a Month of Interest

Check the conditions for any month of the year.

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Gwynedd's climate page.

Popular destinations

What is the weather like in September for the 5 most popular destinations in Gwynedd?

Llandudno

In September Llandudno generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Llandudno
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
13°C 
145 hours 
89 mm 
16 days 
18°C 
11°C 
111 hours 
90 mm 
17 days 
October   >> October
>>  
15°C 
9°C 
83 hours 
102 mm 
19 days 
Climate in Llandudno

Betws-y-coed

In September Betws-y-coed generally has moderate temperatures with maximum daytime temperatures around 17°C, minimum nighttime temperatures around 10°C and moderate monthly rainfall. So on average the conditions are tolerable that month.

Betws-y-coed
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
12°C 
145 hours 
100 mm 
17 days 
17°C 
10°C 
111 hours 
95 mm 
17 days 
October   >> October
>>  
14°C 
7°C 
83 hours 
111 mm 
20 days 
Climate in Betws-y-coed

Criccieth

In September Criccieth generally has moderate temperatures with maximum daytime temperatures around 17°C, minimum nighttime temperatures around 12°C and high monthly rainfall. So on average the conditions are unpleasant that month.

Criccieth
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
18°C 
13°C 
145 hours 
123 mm 
16 days 
17°C 
12°C 
111 hours 
129 mm 
17 days 
October   >> October
>>  
14°C 
9°C 
83 hours 
164 mm 
20 days 
Climate in Criccieth

Conwy

In September Conwy generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Conwy
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
20°C 
13°C 
145 hours 
89 mm 
16 days 
18°C 
11°C 
111 hours 
87 mm 
17 days 
October   >> October
>>  
14°C 
8°C 
83 hours 
97 mm 
19 days 
Climate in Conwy

Dolgellau

In September Dolgellau generally has moderate temperatures with maximum daytime temperatures around 17°C, minimum nighttime temperatures around 10°C and high monthly rainfall. So on average the conditions are unpleasant that month.

Dolgellau
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
12°C 
145 hours 
105 mm 
17 days 
17°C 
10°C 
111 hours 
103 mm 
17 days 
October   >> October
>>  
14°C 
8°C 
83 hours 
128 mm 
20 days 
Climate in Dolgellau

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

Is September the best time to visit Gwynedd?

In our opinion, September is a good time to visit Gwynedd with overall pleasant weather in Llandudno. However, the weather conditions may vary depending on your destination.

Generally speaking, the best visiting conditions can be found in July offering mostly perfect weather in Llandudno. In contrast, January, February, March, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Gwynedd.

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.