Weather on Longs Summit may be capricious. The weather at the summit of Longs Peak may change drastically. It can be crucial to keep an eye on the weather forecast and be equipped for any kind of climate conditions ascending Longs Summit. The mountain is known for its abrupt weather variations as well as dangerous storms. Dressing in multiple layers and carrying additional gear like rain coats, caps, and mittens is crucial to be protected from inclement weather.