Mammoth Mountain / Eastern Sierra Weather Forecast & Discussion

June 9th, 2023 @ 7:35 AM – The endless pattern of cut-off lows off the west coast of California continues, with the next low slated to affect the Eastern Sierra and Mammoth Mountain Saturday into Monday.

This next cut-off low will have a lot of moisture to work with, so any thunderstorms that go off will have heavy rainfall and moderate wind gusts.

Snow levels under these stronger storms could briefly drop to 10,000 – 11,000 feet. It’s more likely you will encounter large-size hail than snow. Make sure to seek cover when you hear thunder approaching.

For Mammoth Mountain, temperatures will be in the upper 40s to lower 50s, with nighttime lows in the low to mid-30s. Winds be light at 5-15 MPH unless a big Thunder Storm fires off, and there could be gusts in the 25-50 MPH range.

Mammoth Lakes temperatures will be in the mid to upper 50s, with overnight lows in the upper 30s to lower 40s with light winds. There will also be a chance of Thunders Storms during the afternoon hours.

For Bishop and the Round Valley, temperatures will be in the upper 70s to lower 80s, with nighttime lows in the low to mid-50s. Afternoon winds will be in the 5-15 MPH range with a slight chance of Thunder Storms.

NWS Mammoth Mountain
NWS Mammoth Mountain


6-5-2023 – Overall, the entire month of June looks below average for temperatures with above-average precipitation chances. The QPF being shown on the models is overdone, but there could be some moderate to heavy rain under any thunderstorms that are due to develop over the next 10 – 14 days.

July looks average temperature-wise, with drier conditions expected, with August into October looking above normal for tempratures with below-average precipitation. The developing El Nino looks more central-based than east-based like we would want. If that is the case, come next late Fall and Winter, you can expect an average to below average winter snowfall-wise.

> FYI: I will be updating the short and long-range weather data image once a week over the summer months


0- 16 Day - EPS 500 Height Anomaly
800 Hour GEFS 00Z Model Run
Jet Stream Wind Speeds at 300 hPa

Long Range Seasonal ECM Model from Early March – Next run on this Model is July 6th

ENSO Outlook – Updated on May 29th

Mammoth Mountain and Eastern Sierra Weather Posts