Mammoth Lakes and the broader Eastern Sierra region are preparing for a shift to wetter conditions this upcoming weekend, with forecasts indicating the potential for snow on Mammoth Mountain and showers across the Owens Valley. These projections were issued by Weather & Atmospheric Forecaster Dennis Mattinson, as Sierra Wave: Eastern Sierra News – The Community's News reported on October 29, 2026.
On October 29, isolated to scattered showers were specifically anticipated over Mammoth Lakes, primarily impacting elevations above 8,500 feet. Looking ahead, a more significant weather pattern is expected to emerge as an upper-level trough, originating from the Pacific Northwest, moves towards the California Coast. This system is forecast to introduce a period of wetter weather for the mountain areas throughout both Saturday and Sunday, affecting outdoor activities and travel plans.
Snow levels are a critical component of the weekend forecast for higher elevations. On Saturday, snow is expected to begin falling at elevations between 7,000 and 8,000 feet. As the weekend progresses, these snow levels are projected to lower further by Sunday morning. This decrease in snow elevation indicates that colder temperatures will allow for snow accumulation at slightly lower altitudes than on Saturday. Residents and visitors planning to be in the high country should take note that a few inches of snow are possible on Mammoth Mountain by the end of Sunday, signaling the onset of more winter-like conditions.
Beyond the immediate mountain ranges, the Owens Valley region is also included in the anticipated weather pattern. Communities throughout the Owens Valley have a chance of experiencing showers beginning Saturday night and continuing into Sunday. This extends the reach of the incoming weather system, affecting a broader segment of residents across Mono County and Inyo County, potentially impacting local events or outdoor plans.
Temperatures across the region are expected to show considerable variation, reflecting the diverse elevations and distinct microclimates of the Eastern Sierra. For Bishop, the forecast indicates a high of 65 degrees Fahrenheit and a low of 35 degrees Fahrenheit. Big Pine is expected to see a high of 66 degrees and a low of 37 degrees. Independence has a projected high of 66 degrees and a low of 42 degrees. Lone Pine's forecast suggests a high of 66 degrees and a low of 44 degrees. Further south, Olancha is anticipated to be the warmest among these valley towns, with a high of 68 degrees and a low of 47 degrees. In contrast, Mammoth Lakes will experience significantly cooler temperatures, with a forecast high of 44 degrees and a low of 29 degrees. Death Valley stands apart with much warmer conditions, predicting a high of 89 degrees and a low of 65 degrees. These temperature differences across the region are important for residents and travelers to consider as they prepare for the weekend.
Dennis Mattinson's forecast underscores the importance of being prepared for changing weather dynamics over the coming days, especially for those in mountain areas anticipating snow and all residents in the path of the incoming showers.
