Disclaimer: As an affiliate I may earn a commission on any qualifying purchase at no extra cost to you – read more.

Wales’ largest national park, is, without doubt, a place that’s best experienced in good weather with hiking, waterfalls, and zip lines among the best things to do in Snowdonia.

But, we can’t always rely on the wonderful Welsh weather to provide us with such beautiful days, which is why I’ve put together this list with some of the top things to do in Snowdonia in the rain.

1. Play Underground Crazy Golf at Zip World

Bounce Below

If you thought golf wasn’t suitable for a rainy day, then think again. One of Zip World’s latest activities to open in Snowdonia is the world’s first 18-hole underground golf course where you can enjoy putting without a drop of rain.

The course is located 500ft beneath the surface at their Llechwedd site and is accessed via Europe’s steepest cable railway. Expect neon lights, dramatic sounds, and interactivity in this fully immersive golf experience.

You can make a full day of it too, on the same site you can take an underground tour of the caverns or experience Bounce Below, a giant underground trampoline park (shown above). There’s also a café and gift shop too.

2. See Model Trains and Memorabilia at the Conwy Valley Railway Museum

If you’re remotely interested in trains and are looking for a rainy day activity in Snowdonia, then Conwy Valley Railway Museum in Betws-Y-Coed is a great bet.

Inside, you’ll find to-scale replicas of local train stations in Snowdonia as well as impressive motorized railways that you can turn on and watch the trains whizz around. There’s also an extensive collection of railway memorabilia including vintage signs, old signalling equipment and conductor uniforms.

Next to the museum, there’s also a cool café inside an old train carriage where you can enjoy a drink and light snacks (note that this is cash only).

If the weather does clear up, there are a few other activities outside of the museum for the kids to enjoy including an electric train they can ride on and a smaller push-operated train. Both of these are paid rides at £2.50 for the electric train and £1 for the push-operated train.

See my full guide for more great things to do in Betws-Y-Coed, one of my favourite villages in Snowdonia.

3. Relax and Pamper Yourself With a Spa Day at the Wave Garden Spa

If you’re going to spend the day indoors, you might as well treat yourself. That’s exactly what you can do at the Wave Garden Spa, found at Adventure Parc Snowdonia.

At the spa, you can enjoy their indoor thermal pool, steam room, Himalayan salt sauna, and an extensive menu of spa treatments from facials to massages. This isn’t just for women either, men are just as welcome and they even have a dedicated section on the treatments menu for male spa-goers.

If you really want to treat yourself, you can even stay here in their woodland rooms or at the luxury Hilton hotel that’s also onsite.

4. Explore the National Slate Museum

The National Slate Museum is one of my favourite indoor activities in Snowdonia and makes a great way to spend an hour to two on a rainy day. Plus, it’s free to visit (although you will need to pay £5 for parking if you use the nearest car park).

Located in Llanberis, the museum is based at the site of Dinorwig Quarry which closed in 1969. Today, there are exhibits, workshops, talks and demonstrations that give you an insight into the history of Welsh slate.

I especially enjoyed visiting the engineer’s house and the old canteen, both of which have been set up to replicate how they would have been many years ago when the quarry was active. Even details such as the sounds have been re-created for an immersive experience.

5. Learn About Wales’ Copper Industry at Sygun Copper Mine

Sygun Copper Mine is a series of caverns and tunnels you can visit near Beddgelert that were once part of a busy copper mine.

It was abandoned in the early 20th century which resulted in the formation of many stalagmites and stalactites. Today, it’s been renovated into a unique visitor attraction with a self-guided tour that will take you around the mine.

The tour takes approximately 40 minutes and finished in the visitor centre which has lots of additional information about the history of the copper mining industry in Wales.

When I visited Snowdonia last, the cost of the tour was £10 for adults, £7.50 for children, and free for under 3’s. Although you’ll be sheltered from the rain, it can get quite cold inside the mine so you should still wear warm clothes for your visit.

Whilst in Beddgelert, you should certainly try and find a break in the rain to visit the grave of Gelert the dog. What on Earth is this I hear you ask? Find out more in my guide to the best things to do in Beddgelert.

6. Ride Through Snowdonia on the Ffestiniog Railway

Just because it’s a rainy day, that doesn’t mean you can enjoy the beauty of Snowdonia’s rolling landscapes. All you need to do is board the Ffestiniog Railway and watch the scenery fly by as you travel through the heart of the national park in the comfort of a warm carriage.

This is no ordinary train though. The Ffestiniog Railway is a 13.5-mile (22 km) heritage track which is the world’s oldest narrow-gauge railway still in operation. It originally opened back in 1836 to transport slate from the quarries in Blaenau Ffestiniog. The train was known as ‘the little train that could’ as it handled the steep inclines of Snowdonia with ease.

Today, a vintage steam train runs along the track from Porthmadog on the coast to the small village of Blaenau Ffestiniog. A journey in one of these carriages is like taking a trip back to the 1960s.

There is a range of services along the Ffestiniog Railway so I recommend checking their site to find out which ones best suit your itinerary.  My top pick would be the Woodland Wanderer which runs from Porthmadog to Tan-Y-Bwlch, stopping off for a tea room break and a walk around the lake before heading back again.

7. Attempt an Underground Assault Course at Go Below

I’ve already shared an underground golf course, but if you fancy taking things to the next level, how about an underground assault course?

Go Below is a series of three underground assault courses found at the caves just outside Betws-Y-Coed (right near Conwy Falls). The assault courses have varying difficulties from medium to tough and will involve abseiling, zip-lining, boating on underground lakes, and freefall jumps (for those brave enough).

This is a full day activity with the courses lasting anywhere between 5 and 7 hours. You should read their website carefully to ensure you choose the right course for your level.

8. Uncover Welsh Myths and Legends at King Arthurs’s Labyrinth

At the southern end of Snowdonia, you’ll find the market town of Machynlleth where one of the top activities is King Arthurs Labyrinth. This is another underground activity where you’ll sail down an underwater river to uncover some of Wales’ most important myths and legends.

As you sail past the underground waterfalls, guided by a hooded Dark Age Boatman, you’ll encounter dragons, colossal giants, battles and, of course, the legendary King Arthur himself.

This immersive experience includes dramatic lighting and sounds to bring the mythical world alive. It’s a great family-friendly activity that will be both educational and a lot of fun. Keep in mind that this closes during the winter so check their website and be sure to book ahead.

9. Explore Porthmadog

Straddling the northwest edge of the national park is the town of Porthmadog which has a plethora of rainy-day activities. Here are a few you could try:

  • Porthmadog Maritim Museum – The town was once a bustling port (its name literally translates as Port Madocks) and you can learn all about the area’s maritime history including the history of the port, shipbuilding in the town, the ships, and the lives of the seafarers.  
  • Purple Moose Brewery – Purple Moose is one of Wales’ most recognisable beer brands and it’s brewed in Porthmadog. Although the brewery tours have still not resumed, you can visit the brewery shop to sample their impressive range and pick up a few souvenirs.
  • The Lloyd George Museum – This museum is dedicated to the only even Welsh prime minister of the UK, David Lloyd George. It can be found in a small village just outside of Porthmadog where the former prime minister was born.

I previously mentioned the Ffestiniog Railway which ends in Porthmadog so you could plan to combine these two activities.

10. Grab a Raincoat and Just Get Wet

I’ve done my best to find some indoor activities to stay dry, but there’s no denying that most of the top activities in Snowdonia are outdoors. So my biggest tip to anyone visiting Wales’ biggest and best national park in the rain is to come prepared with a raincoat, waterproof trousers, and plenty of layers, and just go for it.

If you end up getting a little wet, it’s not the end of the world. There are plenty of cosy pubs with open fires where you can dry off afterwards and enjoy a well-earned drink.

Kieren is the founder and editor-in-chief of Wales Guidebook. Originally from rural Mid-Wales, he has lived all over the country from Cardiff to Wrexham. A true Welshman, Kieren created this site to share his passion for Wales and help others discover this beautiful country.