Monday, July 27, 2026 | 11:00 AM
Today’s Mammoth Weather Headline
Summer heat continues across the Eastern Sierra, with temperatures climbing a little each day as high pressure strengthens. Expect the hottest weather of the week by Friday into the weekend, with Mammoth Lakes approaching 90°F and Bishop possibly reaching 105-107°F.
Current WX Conditions
Mostly Clear Skies – Summer Warmth Continues Across Mammoth Mountain and the Eastern Sierra
Main Lodge: 67°F
Mammoth Mountain Summit: 57°F | SSW wind 7 mph, gusting to 20 mph
Mammoth Lakes: 75°F with light winds
Bishop: 90°F with light winds
Key Takeaways
- 🌞 Warm, dry summer weather continues all week.
- 🔥 Temperatures will gradually increase each day through Saturday as high pressure strengthens.
- 🥵 Next weekend could bring highs near 88-90°F in Mammoth Lakes and 105-107°F in Bishop.
Weather Summary
Warm, dry weather will continue across the Eastern Sierra this week, with hot conditions developing in the lower elevations.
The ridge of high pressure currently positioned east of the Sierra will gradually shift westward during the next several days. As the ridge strengthens over California, temperatures are expected to climb by 1 to 2 degrees each day through Saturday, while dry conditions persist.
Forecast models continue to indicate 597 dm heights moving over the region by Friday. That would support hot temperatures across much of the Eastern Sierra, with Mammoth Lakes approaching 88- 90°F and Bishop potentially reaching 105-107°F next weekend.
Forecast Confidence
Confidence Level: 8/10 (High)
Confidence remains high that the westward-moving ridge of high pressure will produce a significant warming trend this week into next weekend.
The primary uncertainty is how hot temperatures ultimately become by next weekend.
3–5 Day Forecast
Main Lodge / Mammoth Lakes Basin
Monday – Wednesday
- Highs: Mid 70s
- Lows: Mid 50s
Thursday – Friday
- Highs: Lower 80s
- Lows: Mid 50s
Winds
- Southwest 5–10 mph
- Gusts up to 20 mph
Mammoth Lakes
Monday – Wednesday
- Highs: Low 80s
- Lows: Mid 50s
By Friday
- High near 90°F downtown
Winds
- Southwest 5–10 mph
Bishop
Monday
- Sunny
- High near 100°F
- Light winds becoming south-southeast 5–7 mph during the afternoon
By Friday
- Sunny and hot
- High near 105°F
Expected Impacts
- Heat will become more noticeable each afternoon through the week.
- Very warm temperatures are expected in the Owens Valley by the weekend.
- Overnight lows will remain mild, providing limited nighttime cooling.
- Dry weather will continue with no significant precipitation expected.
Fantasy Forecast: Days 6–10
The strong Southwest ridge should be fully established across California during this period, bringing well above-average temperatures and continued dry weather to the Eastern Sierra.
If enough daytime heating develops, a few isolated afternoon buildups could form over the higher terrain around Days 6–7, but widespread precipitation is not expected.
Ultra Fantasy Forecast Period: Weeks 3 & 4
Looking ahead toward mid-August, longer-range guidance continues to indicate lower heights developing across California.
If that pattern verifies, temperatures would trend closer to seasonal averages, with highs returning to the upper 70s around Mammoth Lakes and the mid-90s in Bishop.
Forecast models also suggest a modest increase in moisture, which could produce higher dew points along with isolated afternoon buildups over the Sierra.
Confidence at this range is naturally lower, but the overall trend toward cooler temperatures and slightly increased moisture continues to look favorable.
Image: Temperature / Precipitation Outlook
Below is the ECMWF Ensemble Mean Model Run out to Day 15. Nice to see the strong ridge gone near the end of this model run.
Below is the precipitable water anomaly gif from the ECMWF; you can see how California dries out with the brown over most of the state. Right around August 7th, you can see the moisture from the summer monsoon starting to return. That will bring up dew points and help to reduce the fire danger just a tad.
Climate Discussion – El Niño Update – Fall / Winter 26/27 Trends
El Niño continues to strengthen and is forecast by nearly every major model to reach record intensity later this year. This remains an Eastern Pacific-based El Niño and is projected to become exceptionally strong by December.
Exactly how that translates into next winter’s weather across California remains uncertain.
While El Niño is one of the most important climate signals, it is only one piece of the puzzle. Several additional atmospheric and oceanic patterns will ultimately determine how much snowfall the Eastern Sierra receives.
For now, don’t buy into all of the social media and mainstream news headlines predicting a guaranteed “monster winter.” Much of that coverage is designed to generate clicks.
That said, I do believe this El Niño increases the odds of an above-average snowfall season compared to most years. As always, my family and I prepare for winter well before the first storm arrives.
If current projections verify, there is a stronger-than-average chance that this winter could produce abundant snowfall, including substantial early-season base-building storms.
Final Thoughts
If you’re planning a trip to the area, bringing a fan is a good idea. Warm, stagnant nighttime air can make sleeping uncomfortable, especially since most Condos and Homes are without air conditioning in the high country.
Stay hydrated, plan outdoor activities during the cooler morning hours, and enjoy another beautiful week in the Eastern Sierra.
Have a great day and enjoy the weather!
Steve Taylor
The Snowman
