Sierra Atmospheric Forecast July 30thArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – THU JUL 30 2026Then the main story today will be the heat. Strong high pressure near 4-Corners will shift near our area today into the weekend. This translates to Major Heat Risk in the Owens Valley thru at least Sunday. So by Saturday, 107° is expected in Bishop, 85° in Mammoth, and 125° in Death Valley. Area Wide Temperatures Today:Bishop: 102 / 61Big Pine: 101 / 67Independence: 102 / 72Lone Pine: 100 / 75Olancha: 103 / 75Mammoth Lakes: 82 / 56Death Valley: 120 / 92Related