14 Day Weather FoursSaintLaurent meteoblueWeather on Longs Mountain can be fickle. The on Longs Mountain could change greatly. It is important to monitor the weather forecast and be prepared for any weather conditions ascending Longs Peak. The is noted for its sudden weather variations as well as dangerous storms. Dressing in layers and carrying spare gear like rain jackets, caps, and mittens is crucial to stay protected from inclement weather.