Mammoth Mountain Weather & Discussion
Almost Daily Weather for Mammoth Mountain and the Southern Eastern Sierra
March 10th, 2026 @ 3 PM – Welcome to Spring. Over the next couple of weeks, you can expect strong ridging over California, bringing above-average temps and dry conditions with mostly clear skies.
Going to feel more like May than March with full-on spring corn snow conditions during the AMs and Mash Potato much afternoons. Mammoth Lakes to hit a possible 70, with Bishop maybe an 83, this Thursday at the first ridge peaks in the area.
Mammoth Weather Forecast: For Wednesday into Thursday, expect clear skies. Temps will be jumping up 5 degrees each day, with a 53 at Main Lodge on Wednesday and a 57 on Thursday. Nighttime lows will be 31 at Main tonight and then up to 34 on Wednesday night.
Winds: Wednesday, West wind 10 to 15 mph. Thursday, Northwest wind 5 to 10 mph.
This weekend, look for mostly clear skies, lighter winds, with temps in the upper 50s to lower 60s at Main Lodge. Overnight lows will be in the mid to upper 30s.
Mammoth Weather Discussion: A rare, very strong March ridge of high presure will bring above-average temps over the next couple of weeks. Temps during those times will be 10-15+ degrees above average. Beyond that time frame, the area cools off with maybe a chance of spring snow showers.
Looking further down the line, the very long-range fantasy weekly EU model shows lower or about-average heights returning during April. That’s not a snowy pattern, just one with more average temps and great spring skiing and riding.
Those cooler temps will help preserve the snow for lift operations, hopefully into Memorial Day.
If you have not heard, next Summer, Fall, and Winter will be influenced by the newly forming El Niño. This one looks large and unlike the Modiki western-based El Nino of 2016, that I told everyone would be a bust lol… this one is east-based.
Eastern-based El Niños have a much better chance of bringing significant snowfall to Mammoth Mountain. Will be fun to watch this over the next 6 months. I will be posting updates here during that time frame.
Ski ya later, Snowman out.
❓ Top Mammoth Weather Questions (from the Snowman)
When does Mammoth usually get its first snowfall?
Light snow can fall in late September, but consistent snowfall usually begins in late October or early November. Opening Day typically lands between November 10 and Thanksgiving, depending on storm activity and snowmaking.
How does the ENSO pattern affect Mammoth’s late fall and winter weather?
ENSO (El Niño/La Niña) plays a big role in Sierra storm patterns. El Niño winters often bring warmer, wetter storms. La Niña typically favors colder, backloaded seasons with more snow from February through April. Neutral years are the wildcards with high variability.
What is 500mb height and why does it matter?
500mb height maps show atmospheric pressure around 18,000 feet — a critical layer for tracking storm tracks, ridging, and jet stream placement. Watching 500mb patterns helps forecast Mammoth’s incoming storms and long-range trends.
What are the PNA and PDO, and how do they affect Mammoth weather?
The PNA (Pacific-North American Pattern) influences western U.S. ridging and troughing. A negative PNA favors cold, stormy setups. The PDO (Pacific Decadal Oscillation) affects sea surface temperatures in the North Pacific — a negative PDO often aligns with enhanced storm delivery into California during winter.
👉 Want more answers? Check out the full Mammoth Weather FAQ – 50 Expert Answers to learn more about storms, snow, winds, and long-range patterns from a trusted local source.
Author Bio: Steve Taylor, The Mammoth Snowman. Over the last 40+ years, Steve has spent countless hours studying and learning about Mammoth Mountain Weather and Snow Conditions.
Dr. George, Don Marcelin, Howard Sheckter, and Ted Schlaepfer were his weather mentors at that time. Steve used to hang out with Howard in the Weather War room in the early ’90s, getting first-hand knowledge of Mammoth Weather from the (The Dweeb) himself.
Steve has spent countless hours reading, studying, and watching weather discussions from the NWS and multiple Private Weather Forecasters. He is a long-time member of WeatherBell, Weather West, and AccuWeather Pro. Disclaimer: Steve is a hobbyist forecaster with over 35 years of experience reporting recreational weather and travel reports for the Mammoth Lakes area.