Wales in September: Weather & Travel tips

The weather in Wales in September is a little like its landscapes — moody, dramatic, and full of surprises. One moment you’re walking under crisp, blue skies, the next you’re caught in a sudden shower. It’s a month of shifting seasons — summer’s warmth fading, fall’s golden touch creeping in. Pack a rain jacket and sturdy shoes, but don’t let the weather hold you back. Wales in September feels alive, and its ever-changing skies are all part of the show.

Wales in September at a glance

September in Wales is a mix of mild weather, fewer crowds, and lingering summer charm — ideal for exploring its mountains, coastlines, and villages.

• Temperatures stay around 55°F and 64°F (13°C and 18°C), nights are cooler and showers are unpredictable.
• It's quieter than summer, especially in mid-September, but still lively in popular spots like Snowdonia and Tenby.
• Accommodation prices drop as peak tourist season winds down — perfect for budget-conscious travelers.
• September is best for hiking, coastal walks, and catching Wales’ transition from summer to fall without heavy tourist traffic.

Is September a good time to visit Wales?

September is a great time to visit Wales, as the weather offers a balance of lingering summer warmth and the first hints of fall’s golden hues. The weather in Wales in September is famously changeable — think bursts of sunshine mixed with sudden rain showers — but it’s rarely extreme. Days are mild, perfect for exploring, while evenings can feel cool, especially in the mountains or along the coast.

This month marks the seasonal shift from summer to fall, with greener landscapes softening into autumnal tones. It’s ideal for hiking in Snowdonia or strolling the Pembrokeshire Coast Path, as trails are quieter but still accessible. The weather might keep you guessing, but fewer crowds and lower costs make September one of the best times to visit.

Be prepared for some rain, but pack layers and waterproofs, and you’ll be ready for any adventure. Whether it’s castle-hopping or enjoying cozy pubs after a brisk walk, the changing weather adds to the charm of exploring Wales in September.

Rough Guides tip: read all about the best time to visit Wales.

Average daily temperatures in September

In September, the average daily high temperature in Wales sits around 64°F (18°C), while lows drop to a cooler 50°F (10°C), especially in the evenings. The weather in Wales in September can vary significantly depending on where you are, so it’s worth knowing what to expect by region.

In coastal areas such as Pembrokeshire and the Gower Peninsula, temperatures tend to be milder due to the sea, but breezes can create a chilly feeling. Expected highs are 62°F and 64°F (16°C and 18°C).

Inland, regions like the Brecon Beacons or Snowdonia can be chillier, especially at higher altitudes. Daytime highs hover around 59°F and 61°F (15°C and 16°C), but once the sun goes down, evenings can dip to a brisk 46°F (8°C) - perfect weather for outerwear and a hot drink by the fire.

Cities such as Cardiff or Swansea are slightly warmer, with more heat remaining in urban areas, with daytime highs expected at 63°F and 65°F (17°C and 18°C).

Wherever you are in Wales, September’s temperatures are mild enough for outdoor exploration but cool enough to remind you that fall is just around the corner.

What about the crowd and cost?

September in Wales is quieter than the summer peak, making it a great time to visit if you prefer fewer tourists. Popular spots like Snowdonia and Tenby are still active but far less crowded, especially midweek or later in the month. Accommodation prices start to dip as the high season winds down, and you might snag deals on hotels or B&Bs. 

Attractions are easier to visit without the summer rush, and coastal trails and hiking routes become more relaxed. Overall, September is a balance of good weather, subdued crowds and more budget-friendly travel options.

Looking for more options for your vacation in September? Find the perfect vacation destination with our top suggestions.

Things to do in Wales in September

September is one of the best times to explore Wales, with its mild weather, fewer crowds, and stunning seasonal landscapes. From outdoor adventures to cultural festivals, there’s plenty to keep you busy.

Hike in Snowdonia National Park

Snowdonia’s rugged peaks and sweeping valleys are breathtaking in September. The weather is cooler, making long hikes like the climb up Mount Snowdon more enjoyable. Pack layers and enjoy quieter trails.

Explore the Pembrokeshire Coast

September is perfect for walking the Pembrokeshire Coast Path, where summer crowds have eased. Spot seals along the cliffs, enjoy scenic beaches like Barafundle Bay or kayak the pristine coastline.

Visit Conwy Castle

Conwy Castle is especially atmospheric in September, with fewer visitors and golden light setting off its medieval towers. Wander the castle walls and explore Conwy’s charming old town.

Attend the Abergavenny Food Festival

Every year in September, Abergavenny hosts a food festival celebrating Welsh cuisine. Sample local cheeses, fresh seafood and artisan cider while mingling with foodies from across the UK in a lively festival atmosphere.

Chase waterfalls in Brecon Beacons

The Brecon Beacons' Waterfall Country is stunning in September. Walk trails that lead to cascades like Sgwd Yr Eira and enjoy the first touches of fall in the surrounding woods.

Festivals and events in Wales in September

September in Wales is a mix of food, culture and outdoor activities with something for every traveler. Here are some highlights to mark on your calendar:

• Abergavenny Food Festival: One of the UK’s top food festivals, held mid-September, this is a must for food lovers. Expect artisan producers, cooking demos, and plenty of Welsh specialties like lamb and laverbread. Book tickets and accommodation early, as it’s a popular event.
• Festival No. 6 (Portmeirion): This quirky arts and music festival blends live music, poetry, and theatre in the fantastical Italianate village of Portmeirion. September often sees the festival’s biggest crowds, so plan ahead.
• Ironman Wales (Tenby): Watch (or join) one of the world’s toughest triathlons in Tenby. The event creates a lively buzz in the coastal town, with streets lined with supporters.
• Narberth Festival: A celebration of arts, crafts, and local culture in Pembrokeshire. Stroll through stalls, listen to live music, and soak in the community vibe.

September festivals showcase the best of Welsh culture, but they fill up quickly, so book your tickets early if you plan to take part in the fun.

Plan your trip with our Wales itineraries

Planning your Wales itinerary is key to getting the most out of this diverse and compact country. Wales may seem small on a map, but its winding roads, rugged terrain and countless hidden gems force you to choose your stops carefully. From hiking the peaks of Snowdonia to exploring medieval castles, from relaxing on the beaches of Pembrokeshire to exploring Cardiff's vibrant arts scene, Wales is full of experiences, just not all of them easy to combine.

The itinerary will help you balance your time between the main sights and quieter places away from the roadway. For example, you could spend a few days in the north of the country to see Snowdonia and Conwy Castle before heading south to Brecon Beacons and Cardiff. Proper planning will also ensure you don't miss out on seasonal events.