Longs Peak Weather Conditions and Forecast Weather upon Longs Mountain is inconstant. The at the summit of Longs Peak could shift significantly. It is vital to monitor the forecast and be prepared for any climate conditions before Longs Mountain. The mountain is recognized for its abrupt weather shifts and hazardous weather events. Choosing the suitable attire in multiple layers and carrying spare gear like rain coats, caps, and gloves is essential to be sheltered against inclement weather.