San Diego Weather at Mission Trails, CA

908
FXUS66 KSGX 111933
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1233 PM PDT Wed Mar 11 2026

.SYNOPSIS...
Widespread well above average temperatures expected into next week.
High and low temperature records are expected to be tied or broken
every day through the next week. Heat this week will peak Thursday
and Friday, brief "cool down" for the weekend, before another
increase next week which looks likely to peak mid-week. Widespread
moderate HeatRisk for the valleys, inland coastal areas, and the
lower deserts for Thursday and Friday of this week and for much of
next week beginning on Monday, heat-related illnesses are likely for
sensitive populations.

&&

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

Widespread clear skies are being observed on satellite as of 12 PM
today. Prevailing weak offshore flow will keep marine layer low
clouds and fog from developing through Friday. North to northeast
winds today will peak at 25 to 35 mph on the coastal slopes of the
mountains. Weak onshore flow returns for the weekend into next week,
but any low cloud or fog development looks patchy and confined to
the immediate coast.

A ridge of high pressure will move east over the US West Coast for
Thursday and Friday, which will bring high temperatures west of the
mountains 20 to 25 degrees above average. Widespread moderate
HeatRisk can be expected for the coast and valleys. The mountains
and deserts will see highs 15 to 20 degrees above average. There
will be limited overnight relief from the heat due to elevated
overnight lows. Take extra precautions if working/recreating
outside. Wear lightweight and loose fitting clothing. Try to limit
strenuous activities to early morning or evening. Take action when
you see symptoms of heat exhaustion and heat stroke. Many high
temperatures records across much of area are likely to be tied or
broken on Thursday and Friday. There will also be some record warm
overnight temperatures on Thursday, mainly for the mountains and
inland valleys, with more on Friday.

A weak low pressure system moving inland across the Pacific
Northwest on Friday night will weaken high pressure aloft over
southern California through Saturday with mid and high clouds
spreading across the area for late Friday through late Saturday.
This weak system will bring 3 to 5 degrees of cooling for the coast,
valleys, and mountains with minimal change for the deserts. High
pressure aloft will restrengthen Sunday and Monday, brining another
uptick in temperatures. Temperatures look to peak sometime mid-week,
with the hottest conditions expected in the low deserts. Areas of
major HeatRisk are possible in the low deserts during the peak of
the heat. Tuesday`s NBM chances for high temperatures to exceed 85
at the coast are 70-80 percent; chances of exceeding 95 in San Diego
valleys and inland Orange County are 60-75 percent; and in the
Inland Empire chances of exceeding 95 are 90+ percent. For the low
desert, chances of exceeding 105 degrees on Tuesday are 60-70
percent and closer to 80 percent on Wednesday. Record breaking high
temperatures are expected through the forecast period.

&&

.AVIATION...
111730Z...VFR conditions expected through the TAF period. Slight
chance (10-20%) of low clouds/FG at the immediate coastline Thursday
morning. Otherwise, offshore flow will prevent any marine layer
clouds from impacting the coastal basin.

&&

.MARINE...No hazardous marine conditions are expected through Monday.

&&

.BEACHES...Long period southerly swell with heights of 2-3 ft
and periods of 19-21 seconds will create elevated surf along south
and southwest-facing beaches through Thursday night. Surf heights
generally 3-6 feet with sets to 7 feet.

KW

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from 10 AM Thursday to 8 PM PDT Friday for Orange
     County Coastal Areas-Orange County Inland Areas-San
     Bernardino and Riverside County Valleys-The Inland Empire-
     San Diego County Coastal Areas-San Diego County Valleys.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE/BEACHES...KW