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Mammoth Mountain Weather Forecast & Discussion
“Daily zone-based weather updates for Mammoth Mountain, Mammoth Lakes, Crowley, and Bishop – plus Snowman’s forecast insights and ECMWF model discussions.”
Mammoth Mountain Weather Forecast Summary
Thursday, September 4th, 2025 – 10 AM – Good day. Shower and thunderstorm chances continue in the area through Friday, with clear skies expected this weekend as the thunderstorms disappear for now.
Expect the smoke and haze to continue drifting through at times, which may affect visibility and air quality.
If you’re very sensitive to smoke, I would avoid the area until the first rains of Fall put the Garnet fire to rest. (N95 masks are a must-carry for all, as the wind can shift and blow smoke in fast.)
Temperatures will run a few degrees above average the next couple of days and then start to cool off for the weekend with a 2-3 degree drop by Saturday.
The Main Lodge and the Mammoth Lakes Basin are expected to be in the upper 60s through Friday, with mid-60s temperatures over the weekend.
Nighttime lows will be in the 50s, dropping into the 40s. Winds are expected out of the SW through the weekend at 5-10 with gusts to 20 MPH at times.
Mammoth Lakes will be in the mid-70s on Friday and then the upper 60s to lower 70s this weekend.
For Bishop, low 90s in the afternoons with lows in the low to mid-50s. Winds will be in the light range at 5-10 MPH.
Significant Changes in the weather for next week as the first Fall low comes through, read more in the discussion below.
Mammoth Mountain Weather Forecast Discussion
9-4-25 Good morning. Looking at the current weather pattern on the ECMWF ensemble model, you can see that the Eastern Sierra is still under higher heights at this time.
West of us, you can see the next low-pressure system that will change our weather over the next week. The highest peaks along the Sierra Crest could even see a dusting of snow by next Wednesday/ Thursday.
There is also a possibility of some rain over the Garrnet fire. That’s way out at day 7, so don’t get excited quite yet.
Here is the ECMWF MSLP for today with some T Storms mostly over the crest. They could drift down into the lower elevations later in the afternoon.
The QPF for the next few days appears to be on the weak side.
By the weekend, the upstream low has moved closer and has pushed the area into average heights. This will bring down the temperatures a bit before they come up again early next week as the low strengthens and builds some short-wave ridging in front of it.
Here is the position of the low on Monday, as it continues to deepen and increase slightly in height. As the low approaches, expect an increase in the southwesterly flow.
The image below is for next Wednesday morning, and what you’re seeing has been consistent on the models over the last 48 hours. As this low slowly moves into the area, temperatures will drop and feel fall-like, with the first frost in the high country also a possibility by the end of next week.
A bit of moisture is showing up with this on the ensemble, with much more on the operational model. Since this is a week out, it’s still too early to determine how much, if any, rain this system will bring.
Have a great day and enjoy the Eastern Sierra Weather!
— Steve Taylor, the Mammoth Snowman (WX Links)
WeatherBell.com provides images