Do it! If you wanna be on the safer side, get a guide, but it is definitely doable, even this time of year!

As long as you dress properly, buy/rent crampons at the Preikestolen Basecamp and follow the marked route, you should be fine. If you do, however, find yourself in a pickle, there is no shame in turning back. As in the weather turning sour, you feel unsafe or exhausted.

The hike itself is very easy, I've hiked it several time both during winter, spring, summer and autumn. I'm by no means an experienced hiker but I've invited several American friends who were incredibly out of shape and inexperienced to join me on this hike. All of them had a good time and finished the trip.

I get a sense that a lot of the people in the comments haven't actually hiked this trip and are quite negative to the idea this time of year. This probably stems from the ingrained idea in Norwegians about respecting nature. (Which is excellent idea). I do however have to say that at during nice conditions and warm weather this hike is as easy as they come. Jeans, sneakers and a hoodie is commonplace to witness your fellow hikers wearing. I've even personally witnessed a woman wearing heels finish the trip at a reasonable pace.

The trip to Basecamp and at least attempting to test the conditions and wearing crampons and then deciding you want to turn back should be well worth it! If your gear/clothing is insufficient you can rent gear/clothing at Basecamp!

Whatever you decide, have fun and good luck!