Mammoth Mountain & Eastern Sierra Weather Forecast

Mammoth Mountain & Eastern Sierra Weather Forecast

Mammoth Weather Update for Monday, July 19th, 2021 @ 9:22 AM

Synopsis: This week starts with what looks like to be a good day for thunderstorms and heavy rain showers. Rainfall amounts under storms that do form could be in the .10 to .20 QPF range.

Starting Tuesday we dry out with just a few clouds around. Expect average highs for July in the high country, lower elevations will remain a bit above average.

The usual afternoon Summer winds will be back starting Tuesday. Winds will be from the SW at 10-15 MPH with gusts over the higher elevations 25-35 MPH during the PM hours.

As far as smoke and haze in the area, I would expect just light amounts at times until further notice.

By next weekend there will be isolated thunderstorms returning that will last into the following week.

Looking out over the next 16 days I am not seeing any excessive heat waves, temperatures do look to warm up in about a week and then quickly return to just above average highs out to 16 days.


Mammoth Mountain Ski Patrol Current Conditions 7-19-2021

Mammoth Ski Patrol Weather Station

Cal Trans Window-cast

Mammmoth Mountain from the junction of Highway 203 and 395Highway 203 into Mammoth Lakes

Current Eastern Sierra Air Quality

Window-cast from the Mammoth Lakes Airport WebcamWindow-cast from the Mammoth Lakes Airport Webcam

Live Radar View of Central CaliforniaLive Radar View of Central California

GOES Satellite View of California and the West CoastNOAA Goes 17 Satellite View

Forecast for the Mammoth Lakes Basin & Main Lodge @ 8900 feet

Forecast for the Mammoth Lakes Basin & Main Lodge @ 8900 feet


Forecast for Mammoth Lakes @ 8000 Feet

Forecast for Mammoth Lakes @ 8000 Feet

Forecast for Bishop @ 4200 feet

Forecast for Bishop @ 4200 feet
Forecast for Bishop @ 4200 feet

HRRR High-Temperature Forecast HRRR High-Temperature Forecast

HRRR 18 Hour Precipitation ForecastHRRR 18 Hour Precipitation Forecast

HRRR Current Dew Point

HRRR Current Humidity Levels

Precipitable Water



ECMWF EPS Accumulated Precipitation over 240 Hours

ECMWF EPS Accumulated Precipitation over 240 Hours


ECMWF EPS Ensemble going out 10 days / 240 hour

Temperature Anomaly Outlook

Precipitation Anomaly Outlook




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The ECMWF continues to advertise a MAJOR Dump next week.. Stay Tuned

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Who Are We?

Steve Taylor – Mammoth Snowman Over the last 30+ years, Snowman has spent countless hours studying and learning about Mammoth Mountain Weather and Snow Conditions first hand. He has been skiing around the hill with marked ski poles since March of 1991 so he can measure the fresh snowfall amounts out on the hill. 

Snowman started blogging this information back in 1990 on the old Mammoth BBS system, then the RSN Forums and then on to in 2004 with Video & Photo Blog report. (No YouTube back then). Facebook got added to the fold back in 2008 and then the Facebook Group in 2016. 

Reports, videos, and photos from the website have been featured on both local TV Stations here in Mammoth, along with AP, Fox, ABC, CBS, and NBC News.

Ted Schlaepfer – Mammoth WeatherGuy – The Powder Forecast – Posted Tuesday and Fridays at 5 PM November into Mid May. These forecasts are now responsible for many people getting multiple powder days on Mammoth Mountain over the years.  

Ted’s Bio: Ted has been a full-time Meteorologist (CCM) for the past 25+ years. He has always been fascinated with the weather,” skiing was just a natural extension of my love for snow and rain. I started skiing at age 5,  first discovered Mammoth in 1979 as a youth, and have been a regular visitor since the late ’80s.”.

Here is the link to The WeatherGuys Powder Forecast Page. 

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