Snowdonia weather in September
Cool, with regular rainfall. Average highs of 15°C and lows of 9°C, with around 16 rainy days expected throughout the month.
While September isn't our top-rated month for Snowdonia, it has its own appeal — typically lower prices, fewer crowds, and a more local feel.
Average high
15°C
Average low
9°C
Rainy days
16 days
Best months to visit
Year-round
What to do in Snowdonia in September
Whatever the weather, Snowdonia rewards curious visitors. Here are some of the best ways to spend your time:
Climb Snowdon by mountain railway or on foot
Hike the Llanberis Path or Pyg Track
Kayak on Llyn Padarn or Llyn Gwynant
Explore the slate mines of Blaenau Ffestiniog
Visit Caernarfon Castle
Cycle Mawddach Trail through river gorge
What to pack for September
Layer up — a mid-weight jacket, jumpers, and comfortable trousers. Waterproof shoes are recommended. Scarves and gloves may be useful in the evenings.
Browse other months
January
5C
Cold, with frequent heavy rain.
February
5C
Cold, with regular rainfall.
March
7C
Cold, with regular rainfall.
April
10C
Cool, with some rainy days.
May
13C
Cool, with regular rainfall.
June
16C
Cool, with regular rainfall.
July
17C
Cool, with regular rainfall.
August
16C
Cool, with frequent heavy rain.
September (you are here)
15C
Cool, with regular rainfall.
October
11C
Cool, with regular rainfall.
November
8C
Cold, with frequent heavy rain.
December
6C
Cold, with frequent heavy rain.
Book your September trip to Snowdonia
Find hotels, tours and experiences for the perfect escape.
