Weather & Atmospheric Forecaster Dennis Mattinson issued an area forecast discussion on October 5, 2026, detailing expected conditions for Owens Valley, Mammoth Lakes, Mono County, and Death Valley. The forecast indicates a period of above-normal temperatures for the region, prevailing through Thursday, before a shift in the weather pattern over the upcoming weekend.
According to Mattinson, the current conditions follow a subtle fluctuation in temperature observed yesterday, October 4th. An upper level ridging system is now set to prevail across the area, driving temperatures higher than seasonal averages for the early part of the week. This ridging is the primary factor behind the expected warmth.
By Friday and Saturday, the region is projected to experience a change as another trough affects the area. This incoming trough is expected to bring moderating temperatures, signaling an end to the current period of above-normal heat.
A specific "point of interest" highlighted by Mattinson is the potential for the trough to introduce remnant moisture from Hurricane Rachel. Hurricane Rachel is currently classified as a CAT 3 storm and is located off the Mexican Coast. Residents and visitors are advised to stay tuned for further updates regarding any potential impact from this tropical system.
The forecast for October 6th includes specific high and low temperature predictions for several key locations within the forecast area. For Bishop, temperatures are expected to reach 89 degrees Fahrenheit for the high, with a low of 49 degrees. Big Pine is forecast for a high of 88 and a low of 55 degrees. Independence can expect a high of 89 degrees and a low of 60 degrees. Lone Pine is predicted to see a high of 88 degrees, with temperatures dropping to 62 degrees overnight. Farther south, Olancha is forecast for the highest temperatures among the Owens Valley towns, with a high of 91 degrees and a low of 66 degrees.
In the higher elevations, Mammoth Lakes is projected for a milder day with a high of 71 degrees Fahrenheit and a low of 48 degrees. Towards the desert floor, Death Valley is expected to experience extreme heat, with a high of 110 degrees Fahrenheit and a low of 82 degrees. These temperatures reflect the influence of the prevailing upper level ridging before the weekend trough is anticipated to arrive. The progression of the trough and any associated moisture from Hurricane Rachel will be significant factors to monitor as the week progresses.
