Dennis Mattinson / Sierra Atmospheric Forecaster September 19thArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI SEP 19 2025Tropical moisture moves in today (from TS Mario). Also today should be the best chance of showers and t-storms, as the center of the low passes overhead. Saturday looks much drier, with an isolated t-storm possible over higher elevations. Sunday should be on the dry side for the Valleys, with your temps on the rebound. -DMATTArea Wide Temperatures Today:Bishop: 78 / 48Big Pine: 78 / 54Independence: 78 / 58Lone Pine: 77 / 59Olancha: 79 / 62Mammoth Lakes: 57 / 42Death Valley: 101 / 83Related