Mammoth Mountain Weather & Discussion

Friday, August 7th 2026 @  11:30 AM – Good day. Mammoth Lakes and the Sierra Crest had some cloud cover and a few raindrops on Thursday. Over the next week, expect a 20-30% chance of more isolated storms and cloud cover at times.

Currently at the Main Lodge, the temp is 78 degrees; at the Summit of Mammoth Mountain, you will find a cool 65 degrees with a NE wind at 18 mph, gusting to 30 mph. In Mammoth Lakes, the temp is 83 with light winds; down in Bishop, the temp is 97 in town, also with light winds at this time.

Windowcast Webcam in downtown Mammoth Lakes

Weather Summary: A strong ridge of high pressure will continue to bring warm temps to the high country and hot conditions in the lower elevations into Sunday. Overnight lows will continue to struggle to cool off much before sunrise each day.

By Monday, a slow cooling trend will start to take place as the ridge starts to weaken. Temps look to come down 1-2 degrees each day next week, with 8-10 degrees of cooling expected by next Friday.

As the ridge weakens and moves SE slowly, the monsoon flow will continue to be in the forecast with a 20-30% chance of storms most days over the next week. As of this update, I don’t see much moisture for the T-storms to work, so I don’t expect any moderate to heavy rain over the next week. 

Confidence Level is high that the area will cool off and have isolated t-storms over the next week. 

3-5 Day Forecast:

Main Lodge / Mammoth Lakes Basin: Clear Skies Sunday into Tuesday with the lower 80s. Overnight lows by sunrise in the mid to upper 50s. SW Winds 5-10 mph with gusts to 20 mph.

Mammoth Lakes: Clear Skies Sunday into Tuesday with mid-80s. Overnight lows in the upper 50s to lower 60s. SW Winds 5-10 mph with gusts to 20 mph.

Bishop: Clear Skies Sunday into Tuesday, with later afternoon temps around 100 degrees. Lows before sunrise in the mid to upper 60s.

Fire Permits and Restrictions: Stage 1 Fire Restrictions are in place. To learn more about the USFS Fire Restrictions, visit this link.

Fantasy Forecast Period 7-14 Day Outlook: My favorite model, the EU’s operational run at 12z today, brings in several surges of moisture over the 7-14 day period. QPF output on the model is up to 2 inches over the Sierra crest. We said the same thing last month from the EU, and it turned out to be a bust for the most part. Hopefully this time around the monsoon pattern turns very wet as shown this morning. 

Weather Data: The gif below shows the weather trend out the next 16 days. At day 7, you can see the Eastern Sierra is into the average heights. That pattern will cool the area off into average temps for this time of year, with 70s in Mammoth Lakes and lower 70s up on Mammoth Mountain, with Bishop in the lower 90s. Overnight lows will cool off quicker for better sleeping weather for all elevations.

This pattern at times will have us on the eastern edge of the monsoon pattern, bringing in more isolated T-storms more days than not. A bit of a shift in the pattern could see the area go dry or, better yet, very wet; I’m praying it shifts to very wet.

Ultra Fantasy Forecast Period Trends – Weeks 3 & 4: Looking way out into the later part of August, I continue to see much lower heights in the area compared to where we are today. Image one below is days 14 – 21, and the next image is days 22-29.

We look at weather data this far out to see what the upcoming weather trends are on the models so you can plan your trips better. These are not forecasts, just long-range weather trends that help us to see what might be ahead. The best news I see in the trends is that there is no excessive heat showing up for the Eastern Sierra.

Precip-wise, there is a trend for isolated t storms with light rain under any storm that forms over these 2 weeks. This is the time period we should start to see a ramp-up again in Eastern Pacific Hurricanes that could at some point send a large dose of moisture our way to make the t storms more productive.