Weather Longs Peak meteoblueAtmospheric conditions upon Longs Mountain is volatile. Conditions on Longs Summit may shift drastically. It is vital to check the forecast and be ready for any weather conditions ascending Longs Mountain. The peak is known for its sudden climate variations as well as hazardous storms. Wearing the right clothes in layers and carrying extra equipment like precipitation jackets, hats, and gloves is essential to be sheltered against inclement weather.