Mammoth Mountain & Eastern Sierra Weather Forecast

Recreational Weather for Mammoth Mountain and Eastern Sierra

August 10th, 2022 @ 4 PM Hey everyone, expect a break in the productive T Storms until possibly next Tuesday when the monsoonal flow looks to return with a nice moist flow once again.

The next 4 days look perfect and that includes your upcoming weekend. No insane heat waves on tap just some average summer mid-August highs and lows.

With all the rain everything has really greened up. Come on up for an adventure soon if you can.

Here is what to expect weather-wise over the next week.

Thursday into Friday: Expect clear skies with highs at the resort levels 8900 feet in the upper 60s to low 70s with early morning lows down into the low 50s. Winds will be southwest 10 to 15 mph, with gusts as high as 25 – 30 mph over the higher elevations. Down in Bishop highs will be in the mid-90s with early morning lows in the low 60s.

The Weekend: Looking mostly clear, the EU model wants to start to bring back some build-ups by Sunday.

Officially the forecast is for clear all weekend, with highs in the low 70s at the Resort Level 8900 feet and mid to upper 70s in Mammoth Lakes with early morning lows in the 50s. Down in Bishop highs will be in the mid-90s with early morning lows in the low 60s.

Next Week: As of now a return to the moist monsoonal flow will return, not looking like much rain, but locations that come under a well-developed storm could see a quarter inch or more of rain. Let’s hope the projected moisture increases as next week approaches.

**When Thunder Roars Go Indoors**  If you get stuck out on a hike or ride in the Thunder Storms here is some information on what to do.

Here are the links to the specific highs, lows, and wind speeds for many of the major recreation points in the Eastern Sierra: Mammoth Mountain Main Lodge, Top of Mammoth Mountain, Mammoth Lakes, June Lake, Crowley Lake, Toms Place, Rock Creek Lake, Bishop & Mill Pond, South Lake.

10 Day Outlook Data


EPS 500 Height Anomaly Chart out 240 hours

EPS 10-Day Temperature Anomaly Chart


EPS 10 Day 24 Hour Precipitation Chart

EPS 45 Day Ensemble Mean

8-10-2022 @ 3 PM This is the EPS 45-Day Height Anomaly GIF

Looking at the model run below it goes almost out the start of Fall and there are still none of what I call the death ridges in site for the West. It does look like more muggy days and then some warmer and dry Summer days are left. 

But still, no extreme high pressure ridges like we have seen the last two years. There is still time for that to change but at this point, I would not expect the Summer to end anything like the last 2 years.

The big question at this point that nobody wants to really talk about today is how will the wildfire season in California play out before the first snows fall.

As long as the Monsoonal flow continues with the wet storms the chance for big fires will be suppressed.  What happens after that gets cut off is anybody’s guess.

On the model run below we do see a monsoonal flow still in early September so let’s hope that flow remains nice a wet.


EPS 45 Day Temperature Anomaly

EPS 45 Day Precipitation Anomaly Chart

ECMWF & CFS v2 Long Range Seasonal Outlook
for August 2022


**The new Euro data comes out each month around the 5th of the month. The next update on this data will be around September 7th here at the Mammoth Snowman website.

ENSO - La Nina & El Nino

Mammoth Mountain and Eastern Sierra Weather Posts

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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