Mammoth Mountain
Stoke today Sep 11
Slush
from forecast snow
Next 24 hours forecast
Forecast
0.0″
best available forecast · as of Sep 11 07:57
NWS 0.0″ · Open-Meteo 0.0″
Last 24 hours measured
Station
—
no snow station linked yet
Resort
—
resort isn’t reporting yet
Next 48 hours
Fri 8:00
50°F
Clear
Fri 9:00
52°F
Clear
Fri 10:00
54°F
Clear
Fri 11:00
56°F
Clear
Fri 12:00
58°F
Clear
Fri 13:00
59°F
Clear
Fri 14:00
59°F
Clear
Fri 15:00
60°F
Clear
Fri 16:00
58°F
Clear
Fri 17:00
57°F
Clear
Fri 18:00
56°F
Clear
Fri 19:00
51°F
Clear
Fri 20:00
49°F
Clear
Fri 21:00
49°F
Clear
Fri 22:00
49°F
Clear
Fri 23:00
48°F
Mostly Clear
Sat 0:00
49°F
Mostly Clear
Sat 1:00
49°F
Mostly Clear
Sat 2:00
48°F
Mostly Clear
Sat 3:00
48°F
Mostly Clear
Sat 4:00
48°F
Mostly Clear
Sat 5:00
46°F
Mostly Clear
Sat 6:00
47°F
Mostly Clear
Sat 7:00
46°F
Mostly Clear
Sat 8:00
44°F
Mostly Clear
Sat 9:00
48°F
Mostly Clear
Sat 10:00
52°F
Mostly Clear
Sat 11:00
54°F
Clear
Sat 12:00
56°F
Clear
Sat 13:00
56°F
Clear
Sat 14:00
56°F
Clear
Sat 15:00
57°F
Clear
Sat 16:00
55°F
Clear
Sat 17:00
52°F
Clear
Sat 18:00
51°F
Clear
Sat 19:00
49°F
Clear
Sat 20:00
46°F
Mostly Clear
Sat 21:00
45°F
Mostly Clear
Sat 22:00
45°F
Mostly Clear
Sat 23:00
46°F
Clear
Sun 0:00
46°F
Clear
Sun 1:00
46°F
Clear
Sun 2:00
46°F
Mostly Clear
Sun 3:00
45°F
Mostly Clear
Sun 4:00
44°F
Mostly Clear
Sun 5:00
43°F
Mostly Clear
Sun 6:00
42°F
Mostly Clear
Sun 7:00
41°F
Mostly Clear
Sun 8:00
41°F
Mostly Clear
10-day outlook
Fri Sep 11
68°F / 41°F
wind 11 mph
Sat Sep 12
65°F / 36°F
wind 14 mph
Sun Sep 13
63°F / 40°F
wind 13 mph
Mon Sep 14
65°F / 35°F
wind 5 mph
Tue Sep 15
66°F / 34°F
wind 11 mph
Wed Sep 16
66°F / 32°F
wind 12 mph
Thu Sep 17
66°F / 35°F
wind 11 mph
Fri Sep 18
70°F / 35°F
wind 11 mph
Sat Sep 19
65°F / 36°F
wind 13 mph
Sun Sep 20
65°F / 37°F
partial day
wind 6 mph
Forecast data: National Weather Service; Weather data by Open-Meteo.com (CC BY 4.0); Data from MET Norway (CC BY 4.0) — adapted by SnowAlert.
In the forecaster’s words
Overnight
Mostly clear, with a low around 50. Southwest wind 20 to 25 mph, with gusts as high as 35 mph.
Today
Sunny. High near 60, with temperatures falling to around 57 in the afternoon. Southwest wind 20 to 25 mph, with gusts as high as 35 mph.
Tonight
Mostly clear. Low around 43, with temperatures rising to around 46 overnight. Southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday
Sunny. High near 57, with temperatures falling to around 52 in the afternoon. Southwest wind 20 to 25 mph, with gusts as high as 40 mph.
Saturday Night
Mostly clear, with a low around 40. Wind chill values as low as 32. Southwest wind 25 to 35 mph, with gusts as high as 55 mph.
Sunday
Sunny, with a high near 55. Southwest wind 15 to 35 mph, with gusts as high as 55 mph.
Forecast discussion SGX · Sep 11 03:49
Drying and gradual cooling is expected through the weekend with HeatRisk for most areas below Moderate by the end of the weekend. Patchy night and morning coastal low clouds will increase in coverage and spread locally into the western valleys at times for the weekend into early next week. High pressure to the east is expected to bring a warming trend for the latter half of next week.
Read the full discussion
000
FXUS66 KSGX 111049
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
349 AM PDT Fri Sep 11 2026
.SYNOPSIS...
Drying and gradual cooling is expected through the weekend with
HeatRisk for most areas below Moderate by the end of the weekend.
Patchy night and morning coastal low clouds will increase in
coverage and spread locally into the western valleys at times for
the weekend into early next week. High pressure to the east is
expected to bring a warming trend for the latter half of next
week.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Sunday)...
High pressure over southern California will weaken as a low
pressure system moves southward off the British Columbia coast
today and inland through the Pacific Northwest on Saturday. This
will strengthen the onshore flow across southern California with
drier southwest flow aloft. Cooling began to spread inland on
Thursday and that will continue through the weekend. High
temperatures will be a few degrees cooler for most areas for today
and again on Saturday with a little greater cooling for the
valleys of around 5 degrees on Sunday.
High temperatures for today will still be 5 to locally 10 degrees
above average with high temperatures ranging from the upper 70s to
mid 80s near the coast to the 90s for the Inland Empire with 106
to 110 for the lower deserts. While not quite as hot as recent
days, Moderate HeatRisk will continue for the valleys and inland
coastal areas and a Heat Advisory has been issued for these areas
through 8 PM today.
For Sunday, high temperatures near the coast will be near average
with the lower deserts a few degrees above average with the
valleys around 5 degrees below average. High temperatures on
Sunday will range from the mid to upper 70s near the coast to the
upper 80s and lower 90s for the Inland Empire with 102 to 106 for
the lower deserts.
Low temperatures will cool as the atmosphere cools and inland
areas dry with low temperatures on Sunday still a few degrees
above average for the coast into the valleys and around 5 degrees
above average for the mountains and deserts. Low temperatures on
Sunday for the coast and valleys will be mostly in the 60s with a
few of the cooler protected valleys in the mid 50s.
With drying of mid and higher level moisture, patchy night and
morning coastal low clouds will increase in coverage and spread
locally into the far western valleys at times over the weekend as
the marine layer slowly deepens.
&&
.LONG TERM (Monday through Thursday)...
Low pressure near the California will weaken early next week. High
pressure to the east may begin to expand across the area for the
latter half of next week. Temperatures will continue to cool for
early next week with Tuesday high temperatures ranging from the
70s near the coast to the 80s for the Inland Empire with the lower
deserts around 100. This will be followed by a warming trend for
Wednesday through Friday of next week, but with increase spread
in just how much warming may occur. The NBM 50th percentile would
warm temperatures to around average for Friday of next week with
high temperatures for next Friday ranging from the mid 70s to
lower 80s near the coast to the upper 80s and lower 90s for the
Inland Empire with 100 to 104 for the lower deserts. Dry weather
is expected to continue for Monday through Thursday of next week.
&&
.AVIATION...
111100Z...Coast...Patchy low clouds with bases around 600-900 feet
MSL and local vis 3-5SM, lowest on coastal mesas, will continue
through 16Z. Cigs most likely around KSAN. Low clouds to return
after 02Z with more uniform and expansive coverage. Bases around 900-
1200 feet MSL.
Otherwise, SCT clouds above 15 kft and VFR conditions today and
tonight, with cumulus clouds around 10 kft over mountains 19-00Z.
&&
.MARINE...
No hazardous marine conditions are expected through Tuesday.
&&
.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT this evening for Orange County
Inland Areas-San Bernardino and Riverside County Valleys-
The Inland Empire-San Diego County Coastal Areas-San Diego
County Valleys.
Extreme Heat Warning until 8 PM PDT this evening for Coachella
Valley-San Diego County Deserts-San Gorgonio Pass near
Banning.
PZ...None.
&&
$$
PUBLIC...17
AVIATION/MARINE...MM
Sources & last updated
- Data from MET Norway — CC BY 4.0, adapted by SnowAlert fetched Sep 11 05:06
- National Weather Service fetched Sep 11 07:57
- Weather data by Open-Meteo.com, from the ECMWF and NOAA models — CC BY 4.0, adapted by SnowAlert fetched Sep 11 06:02