Gwynedd Weather in September

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

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Llandudno Criccieth Conwy Holyhead

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

What to Expect in Gwynedd in September

Gwynedd, the United Kingdom 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 (64°F) and nighttime temperatures around 11°C (52°F) in Llandudno.

To explore the conditions in Gwynedd, the United Kingdom 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 (3.2 in) to high rainfall in Pistyll with 145 mm (5.7 in).

Average sunshine

Most places get a reasonable amount of sunshine. Take Llandudno as an example - it receives around 111 hours of sunlight, offering a nice mix of sunny and partly cloudy days. Want to compare this with brighter destinations? Try our weather planner to explore your options.

Explore Gwynedd by month

Pick a month to see the average temperature, rainfall and sunshine in Gwynedd - and find the best time to visit. (based on Llandudno)

January9°C (48°F) February9°C (48°F) March10°C (50°F) April12°C (54°F) May15°C (59°F) June18°C (64°F) This monthJuly20°C (68°F) August19°C (66°F) September18°C (64°F) October15°C (59°F) November11°C (52°F) December9°C (48°F)
Best Time to Visit Gwynedd →

Best Places to Visit in Gwynedd in September

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

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 Gwynedd

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

Temperature range in Gwynedd (September)

Precipitation variation in Gwynedd (September)

Llandudno

In September Llandudno generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
15°C (59°F)
Min temperature
13°C (55°F)
11°C (52°F)
9°C (48°F)
Monthly sun hours
145 hours
111 hours
83 hours
Monthly rainfall
89 mm (3.5 in)
90 mm (3.5 in)
102 mm (4 in)
Monthly rainy days
16 days
17 days
19 days
Weather conditions
very good
very good
mixed
Climate in Llandudno →

Criccieth

In September Criccieth generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 12°C (54°F) and high monthly rainfall. So on average the conditions are mixed that month.

« August
September
October »
August
September
October
Max temperature
18°C (64°F)
17°C (63°F)
14°C (57°F)
Min temperature
13°C (55°F)
12°C (54°F)
9°C (48°F)
Monthly sun hours
145 hours
111 hours
83 hours
Monthly rainfall
123 mm (4.8 in)
129 mm (5.1 in)
164 mm (6.5 in)
Monthly rainy days
16 days
17 days
20 days
Weather conditions
good
mixed
mixed
Climate in Criccieth →

Conwy

In September Conwy generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
18°C (64°F)
14°C (57°F)
Min temperature
13°C (55°F)
11°C (52°F)
8°C (46°F)
Monthly sun hours
145 hours
111 hours
83 hours
Monthly rainfall
89 mm (3.5 in)
87 mm (3.4 in)
97 mm (3.8 in)
Monthly rainy days
16 days
17 days
19 days
Weather conditions
excellent
very good
good
Climate in Conwy →

Holyhead

In September Holyhead generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
15°C (59°F)
Min temperature
14°C (57°F)
13°C (55°F)
11°C (52°F)
Monthly rainfall
81 mm (3.2 in)
89 mm (3.5 in)
114 mm (4.5 in)
Monthly rainy days
16 days
16 days
19 days
Weather conditions
very good
very good
mixed
Climate in Holyhead →

Bangor

In September Bangor generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
18°C (64°F)
15°C (59°F)
Min temperature
12°C (54°F)
10°C (50°F)
8°C (46°F)
Monthly sun hours
145 hours
111 hours
83 hours
Monthly rainfall
96 mm (3.8 in)
94 mm (3.7 in)
107 mm (4.2 in)
Monthly rainy days
16 days
17 days
20 days
Weather conditions
excellent
very good
mixed
Climate in Bangor →

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

Popular cities in September

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

City Weather Day temp Night temp Rainfall
Llandudno 18°C (64°F) 11°C (52°F) 90 mm (3.5 in)
Criccieth 17°C (63°F) 12°C (54°F) 129 mm (5.1 in)
Conwy 18°C (64°F) 11°C (52°F) 87 mm (3.4 in)
Holyhead 18°C (64°F) 13°C (55°F) 89 mm (3.5 in)
Bangor 18°C (64°F) 10°C (50°F) 94 mm (3.7 in)
Beaumaris 18°C (64°F) 11°C (52°F) 92 mm (3.6 in)

Gwynedd weather in September: frequently asked questions

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

Gwynedd, the United Kingdom typically experiences very good weather in September, part of the season. Daytime highs in Llandudno average around 18°C (64°F), and temperatures drop to about 11°C (52°F) at night.

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

In Llandudno, the average daytime high in September is 18°C (64°F), while nighttime temperatures drop to around 11°C (52°F).

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

Rain is generally moderate to light in Gwynedd, the United Kingdom during September, with Llandudno averaging close to 90 mm (3.5 in).

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

In our opinion, September is a good time to visit Gwynedd, the United Kingdom with overall very good 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 excellent weather in Llandudno. In contrast, January, February, March, November and December tend to have less favorable 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.

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