Sun Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

221
FXUS66 KLOX 300351
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
851 PM PDT Mon Jun 29 2026

.SYNOPSIS...29/850 PM.

Low clouds will linger each night/morning along the coast and in
coastal valleys with the potential for some very light drizzle.
Falling heights will keep temperatures well below normal through
the middle of the week. Temperatures will begin to warm by
Thursday, with many valley locations warming into the 90s again by
early next week.

&&

.SHORT TERM (MON-THU)...29/850 PM.

***UPDATE***

Today began with a deep, extensive marine layer cloud deck that
pushed far into the valleys and portions of the coastal slopes.
The coasts warmed to the 60s and low 70s, with 70s common through
most of the valleys and warmer upper 70s to 80s for the interior,
and temperatures trended 8 to 15 degrees below normal.
Temperatures were altered a bit to account for cooler values along
the Central Coast for tomorrow, but otherwise the forecast looks
on track.

Clouds have pushed into the Central Coast this evening, and
developed in a patchy nature over southern areas in part due to
a weak inversion. Expecting much of the same over the next few
days with strong onshore flow and plenty of marine layer clouds
during the overnight to morning hours, with clearing throughout
the day. Fog will be possible in the usual places, along with
higher elevation areas on the edge of the cloud deck. Will likely
continue to see gusty west to southwest winds over the interior
each afternoon, perhaps nearing advisory levels around Wednesday
afternoon.

***From Previous Discussion***

A closed low will track southward through CA today before lifting
into NV early Tuesday and transitioning to an open trough. The
pressure gradient will tighten today and subsequent days as
shortwaves swing through, resulting in breezy conditions,
especially in the Antelope Valley/Foothills and the San Luis
Obispo Valley. No wind highlights are planned at this time as
winds look to remain sub-Advisory or very marginal in localized
areas in these regions. Various high resolution models, as well as
the National Blend, maintain broad coverage of 25 to 35 mph wind
gusts this afternoon with a relatively smaller region of 35 to 40
or so mph gusts, especially across the Foothills. The National
Blend max gust for today and Tuesday is generally 38 to 44 mph
across a relatively small portion of the aforementioned regions.
Daytime temperatures will remain very stable, running below
climatological norms through mid-week. Widespread highs will range
the 70s with 80s in the valleys. Temperatures will then warm
beginning Thursday into the next week.

.LONG TERM (FRI-MON)...29/1209 PM.

Temperatures will continue warming by another several degrees on
on Friday and warm to within a few degrees on either side of
normal on Saturday. Ensembles indicate a pattern change come next
weekend, although confidence in the temperature and wind forecast
next week is moderate. Ensembles differ on the upper-level
details, specifically the strength of the ridge. While Saturday,
July 4th won`t be the warmest day of the extended period, some
locations could warm into the high 90s. The National Blend
indicates over a 90% chance of 90 plus degrees across the Antelope
Valley on the 4th while 50% to 60% chance across the San Luis
Obispo Valley. The likelihood of reaching 85 degrees is much more
widespread. Some models feature another PacNW low early next week
while others maintain some magnitude of high pressure or a zonal
regime heading into the middle of next week. Temperatures look to
return to normal or slightly above with upper 80s to low 90s in
the forecast again by early next week. Additionally, offshore
sundowner winds could develop early next week along the Santa
Barbara coast.

&&

.AVIATION...30/0143Z.

At 00Z at KLAX, the marine layer was 1600 ft deep. The top of the
inversion was 2300 ft with a temperature of 15 Celsius.

High confidence in VFR TAFs for KPMD and KWJF.

There is a 20% chance for brief cigs at KPRB, and Moderate
confidence (50+% chance) in ceilings at all other airports for
tonight into Tuesday morning. Moderate confidence in timing (+/- 3
hours) and flight categories +/- 1 category.

KLAX...High confidence in ceilings forming tonight into Tuesday
morning. Moderate confidence in timing (+/- 3 hours) and flight
categories (+/- 1 category). High confidence in any easterly wind
staying under 6 knots.

KBUR...High confidence in ceilings tonight into Tuesday morning.
Moderate confidence in timing (+/- 3 hours) and flight categories
(+/- 1 category).

&&

.MARINE...29/819 PM.

Moderate to high confidence in Small Craft Advisory (SCA) level
winds or seas continuing for the outer waters from the Central
Coast to San Nicolas Island through tonight. The SCA seas are
affecting the northernmost outer waters off the Central Coast.
Otherwise, SCA winds further south, strongest from Santa Rosa to
San Nicolas Island. High confidence in waves diminishing on
Tuesday. SCA wind chances also decrease through the coming week,
with a 30% chance of SCA gusts over western PZZ670.

Other than a 30% chance of SCA winds over the western Santa
Barbara Channel each afternoon and evening through Tuesday, high
confidence in conditions staying under SCA for the rest of the
waters.

All waters will see short-period choppy seas through the period.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...Small Craft Advisory in effect until 3 AM PDT Tuesday for
      zones 670-673-676. (See LAXMWWLOX).

&&

$$

PUBLIC...Phillips/Cropp
AVIATION...Phillips
MARINE...CC
SYNOPSIS...Cropp

weather.gov/losangeles

Experimental Graphical Hazardous Weather Outlook at:
https://www.weather.gov/erh/ghwo?wfo=lox