Longs Peak Weather Forecast 4345m sgnstqcdyllxcomWeather on Longs Mountain may be changeable. The weather atop Longs Summit could alter greatly. It's crucial to keep an eye on the weather forecast and be ready for any climate conditions hiking on Longs Peak. The mountain is known for its sudden climate variations as well as risky storms. Dressing in multiple layers and carrying extra equipment like rain jackets, caps, and gloves is crucial to be safe from the elements.