San Diego Weather at Mission Trails, CA

510
FXUS66 KSGX 270025
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
525 PM PDT Sun Jul 26 2026

.SYNOPSIS...
A gradual cooling trend begins today and will continue through
Tuesday/Wednesday, bringing temperatures around 5 degrees above
average for midweek. The upper level ridge will shift west again
towards Las Vegas and restrengthen in the latter half of the
week. There is increasing confidence that this setup could provide
the hottest temperatures of the Summer thus far.

&&

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

...UPDATED AVIATION DISCUSSION...

High pressure continues to dominate aloft but has shifted just far
enough east to bring some monsoonal moisture over the area through
the afternoon. Light rain has been observed from the San Diego coast
into the San Diego mountains with accumulations less than 0.1
inches. Rain and storm chances will continue through this afternoon
with the highest chances in the mountains and the San Diego deserts.
Conditions will dry out by this evening, leaving chances for rain
below 5% through the end of the week.

High temperatures will stay slightly cooler through Wednesday as the
upper level ridge stays a little east. Heat is expected to return
Thursday through the end of the week as high pressure aloft builds
and expands west once again. High temperatures will warm to be 10-15
degrees above the seasonal average by Friday and into the weekend.

&&

.AVIATION...
270000Z....Coast/Valleys...FEW-BKN mid-level clouds over inland
areas this afternoon, decreasing into the evening. Low clouds based
1100-1400 ft MSL start developing onshore within 15-20 miles of the
coast after 03z (after 07z in OC), remaining patchy until around 10z
when coverage increases and fills in gaps. VIS reduced along
elevated coastal terrain and locally in elevated valleys up to 20
miles inland. Low clouds mostly scatter 16-17z. 30% chance that
brief cigs possible at the immediate coast after 21z as low clouds
begin redeveloping early. Otherwise, VFR conditions prevail Monday
afternoon.

Mountains/Deserts...VFR prevails with FEW-BKN mid-level clouds
around 10-15k ft MSL passing through today. A few stray showers are
possible over the mountains and into the adjacent deserts until
around 02z this evening.

&&

.MARINE...
Calm conditions into the early half of next week with waves 3 to 5
feet and afternoon wind gusts near 15 kts or less through Tuesday.
Waves increase in the outer waters mid to late week with waves
expected around 5 to 7 feet.

&&

.BEACHES...
A persistent background long-period southwesterly swell (2-3 feet
at 17-19 seconds) keeps surf elevated at around 3-5 feet with sets
to 6 feet into Wednesday. By Wednesday afternoon/evening, a much
higher amplitude swell associated with Hurricane Genevieve is set to
build. Some uncertainty exists in exactly how strong this swell will
be as it depends on the strength and track of Genevieve, but current
guidance suggests the swell could be around 5-7 feet, with a period
around 14 seconds. Should this come to fruition, breaking waves of 9-
11 feet are possible for south-southwest facing beaches for Thursday
and Friday.

In addition to elevated surf, tides are expected to increase to a
height of 6.0 to 6.5 feet MLLW by for this evening`s high tide and
continue at that height through most of the week. The combination of
surf and tides will likely result in at least minor tidal overflow
during the evening high tides. More notable coastal flooding is
possible when the high tides combine with the elevated surf brought
with Genevieve`s swell later this week. It is worth noting, that
with the effects from this year`s El Nino, observed tides have been
consistently about 0.3-0.5 feet below many baseline predictions.

A Beach Hazard Statement remains in effect through 6PM Wednesday due
to the elevated surf, rip current risk, and concern for minor tidal
overflow. Additional products for coastal flooding and high surf are
looking increasingly likely for later this week.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Wednesday afternoon for Orange
     County Coastal Areas-San Diego County Coastal Areas.

     Heat Advisory until 8 PM PDT Monday for Orange County Coastal
     Areas-Orange County Inland Areas-Riverside County Mountains-
     San Bernardino County Mountains-San Bernardino and
     Riverside County Valleys-The Inland Empire-San Diego County
     Coastal Areas-San Diego County Mountains-San Diego County
     Valleys-Santa Ana Mountains and Foothills.

     Extreme Heat Warning until 8 PM PDT Monday for Apple and Lucerne
     Valleys-Coachella Valley-San Diego County Deserts-San
     Gorgonio Pass near Banning.

PZ...None.

&&

$$

PUBLIC...Villafane
AVIATION/MARINE/BEACHES...Westerink