Walking/hiking poles useful in Switzerland?

Regarding the weather you only need to layer up under your summer jacket in Murren early morning (and wear a hat to protect your skin) if you go up 10,000 feet to the top of the Schilthorn in Switzerland. When you get down to the Lauterbrunnen valley it is a lot warmer that you will want to take off a layer.

If you are klutzy like me, take poles. I take them on any trip that might involve uneven surfaces.

Unfortunately, poles are not allowed in carryon and must be checked.

We are carrying-on and will rent poles rather than risk having ours confiscated by TSA, even though we've gotten them through in the past in our carry-on bags.

Trekking poles: it really depends on where you go and your health conditions.
On easy walks, poles are not needed.

"Cold" is a subjective term. Weather in June is usually fine, but it may still be quite cold on high mountain tops.

If you're on snowy peaks, it's going to be hats, gloves, and scarf cold. However, the cities can be in the 70-80 degrees range.
I saw gals going up the the Jungfraujoch in sundresses and sandals. Then I saw them buying parkas in the gift shop. Don't think there were any winter shoe options in the gift shops.
Enjoy your trip!

I almost bought collapsible walking poles last year for RS My Way Alps tour but opted not to. I ended up never needing them! My plan was to either rent some or buy some once over there. You can always try that.

I would suggest being prepared with layers. At the top of places like the Schilthorn or Zugspitze, as someone else mentioned, it may be quite cold. Layers with a fleece/jacket + light gloves worked for me. Hope you have a wonderful trip!

We have taken poles every one of our 5 trips to the Lauterbrunnen Valley area BUT we’re in an “older” demographic. Last time we had one pole break and other pretty useless so I rented poles, very easy to do. Glad I had them, we ended up on a very steep downhill hike we’d never done before, would’ve been awful without the poles.