956
FXUS66 KSGX 281730
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1030 AM PDT Sat Mar 28 2026

.SYNOPSIS...
Well above average temperatures will continue through the weekend.
Patchy low clouds continue to develop early this morning, clearing
by mid-morning and less likely to return through early next week
due to widespread high cloud coverage. Cooler and breezier
conditions are likely by the middle of next week, although
precipiation chances continue to decrease.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

...UPDATED 18Z AVIATION/MARINE DISCUSSION BELOW...

Daily high and low temperature records continue to break (listed
on our weather.gov/sandiego homepage) and are expected to continue
to break through Sunday, especially in the mountains and deserts.
The ridge is expected to have a peak 500 mb height around 590 dam
this afternoon, centered over west Texas, yielding another day of
temperature anomalies of 15-25 degrees above average. Onshore
flow will limit those anomalies along the coast with highs
remaining in the 70s where the sea breeze kicks up in the late
morning. The marine layer will be very shallow Saturday night and
clouds/fog will be almost non-existant (even over the waters),
yielding to another mild night across the region. Lows will
struggle to drop up below the mid-60s in the mountain foothills
and north of the SR-210 corridor. While high temperatures Sunday
will be very similar to today`s highs, the broad ridge over Texas
is expected to weaken and slide eastward, allowing for the marine
layer to deepen and bring noticeably cooler nighttime temperatures
in the 50s across the coastal basin. By Monday, highs drop
noticeably inland - about 6 to 10 degrees - as upper level flow
over the Western US turns more zonal. A relatively shallow trough
is then expected to dig into the Pacific Northwest mid-week,
weakening significantly as it makes it southward trek, though
setting the stage for cooler, cloudier and breezier conditions for
mid-week.

Precipitation chances continue to dwindle, however, for Southern
California as the majority of model ensemble runs remain
completely dry, and the remaining others showing no more than a
trace for the entire coastal basin. The window for any light
showers appears to be focused on early Wednesday, with the highest
chances (15-25%) in the mountains, where guidance shows
increasing confidence for no more than 0.10" total. Confidence is
much higher that temperatures return close to average Wednesday
and Thursday.

&&

.AVIATION...
281710Z...Increasing confidence for low clouds 400-800 ft MSL to
come back along San Diego County coastal areas tonight, lesser
confidence in Orange County. Confidence in timing is low to moderate
with best chances for low clouds between 08-18Z Sun, though clouds
may be delayed until 10-12Z. Vis reductions 2-5 sm, with higher
terrain obscured in fog. Low clouds scattering 16-18Z Sun.

Otherwise, inland areas partly to mostly clear with clouds AOA 20K
ft MSL through the TAF period.

&&

.MARINE...Breezy northwest winds this afternoon with gusts near 20
kts near San Clemente Island. Otherwise, no hazardous marine
conditions expected through Wednesday.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...Westerink
AVIATION/MARINE...APR

NWS San Diego (SGX) Office