Aliso Viejo, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

616
FXUS66 KSGX 191727
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1027 AM PDT Thu Mar 19 2026

.SYNOPSIS...
Widespread moderate with areas of major HeatRisk will continue
through Friday. HeatRisk will decrease for the weekend, with minor
cooling. Even with the cooling, temperatures will remain above
average into next week. Patchy marine layer low clouds and fog will
be present at times, most likely to impact the coastal waters and
immediate coast.

&&

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

Multiple daily and monthly high and low temperature records were
broken yesterday with more expected to be broken today and Friday.
The latest record report is headlined on our weather.gov/sandiego
homepage. A climate section can be found below listing locations
that are currently forecast to tie or break their monthly records.
Widespread moderate to locally major HeatRisk is expected through
Friday for most locations and Saturday in the low desert. Reduce
outdoor activities if possible between 10 AM and 5 PM, seek shade,
and stay hydrated.

The high pressure aloft will peak in strength over the
California/Arizona border today with temperatures 20 to 30 degrees
above average for this time of year. Overnight lows will also be
elevated, which will limit overnight relief from the heat for most
inland locations. Through Friday widespread temperatures in the 90s
to low 100s expected for the inland valleys, with highs in the mid-
80s to low 90s for coastal areas away from the immediate coast and
the lower elevations of the mountains. In the low deserts, highs
will likely exceed 105 degrees in most locations through Saturday.
Chances for exceeding 110 degrees on Friday are 60 percent for
Indio, 20 percent for Palm Springs, and 10 percent for Borrego
Springs. In the High Desert, temperatures will be in the mid-90s.

Weakening high pressure aloft and strengthening onshore flow will
bring 4 to 8 degrees of cooling Saturday. That will be most
noticeable for locations west of the mountains, but even the deserts
will cool 3 to 5 degrees. A weak low pressure system aloft will move
east through Southern California into the Great Basin sometime
Sunday or Monday. that will bring an uptick in westerly winds
Saturday, which have the potential to turn weakly offshore by Sunday
afternoon into Monday morning. Ridging aloft looks to rebuild Monday
and strengthen into the middle of the week. This ridge isn`t expected
to be as strong as the one over Southern California this week, but
it will be enough to maintain above average temperatures through
next Thursday. Widespread minor with areas of moderate HeatRisk will
be present in the valleys and low desert for much of next week.

With the ridge axis shifted further east today, weak onshore flow
has returned to coastal areas. The weak onshore flow was enough to
allow patchy dense fog along the immediate coast this morning. Areas
of patchy dense fog over the water and at the coast is possible each
morning through Saturday. With the aforementioned passing weak low
pressure onshore flow will briefly increase, making chances of dense
fog less likely for Sunday morning. Low cloud and fog coverage on
Sunday morning may reach into the western valleys. Weak offshore
flow early next week may keep low clouds and fog patchy and more
confined to the immediate coast again.

&&

.AVIATION...
191800Z...Low clouds and fog have moved offshore with VFR conditions
expected through 03Z Friday. low clouds and patchy fog will make its
return along the coast beginning after 03Z Friday near KSAN, touching
into other coastal TAF sites after 06Z-07Z. Highest impacts are
expected at KSAN at this time with clearing 16Z-17Z. Everywhere
else, VFR conditions expected through the TAF period.

&&

.MARINE...Still some patchy fog out over the local waters this
morning, but is making a slow retreat to the outer waters. Expect
patchy fog development in the late afternoon to early evening hours
but not expecting it to be dense at this time. Otherwise, no
hazardous marine conditions are expected through Tuesday.

&&

.CLIMATE...
Here are a list of locations currently forecast to break/tie
monthly high temperature records Wednesday through Friday:

Today:

             FORECAST HIGH  RECORD YEAR     AVG    +/-
    RAMONA             95    92 IN 1997      68    28   Monthly Record: 94
    BIG BEAR LAKE      82    70 IN 1997      52    28   Monthly Record: 80
    IDYLLWILD          91    77 IN 1997      60    27   Monthly Record: 82
    PALOMAR MOUNTAIN   88    76 IN 2007      57    28   Monthly Record: 82
    LAKE CUYAMACA      88    79 IN 1956      56    30   Monthly Record: 82
    CAMPO              97    87 IN 1997      69    26   Monthly Record: 92
    PALM SPRINGS      107    97 IN 1997      80    29   Monthly Record: 104
    INDIO             108    98 IN 1997      81    28   Monthly Record: 104
    THERMAL           108   101 IN 1997      82    29   Monthly Record: 103
    BORREGO           107    95 IN 2017      80    24   Monthly Record: 101

Friday:

             FORECAST HIGH  RECORD YEAR     AVG    +/-

    RAMONA             96    92 IN 1997      68    28   Monthly Record: 94
    BIG BEAR LAKE      80    72 IN 2004      52    29   Monthly Record: 80
    IDYLLWILD          88    79 IN 2004      60    27   Monthly Record: 82
    PALOMAR MOUNTAIN   87    76 IN 1972      57    29   Monthly Record: 82
    LAKE CUYAMACA      88    75 IN 2004      56    32   Monthly Record: 82
    CAMPO              97    92 IN 1997      69    27   Monthly Record: 92
    PALM SPRINGS      109    98 IN 2004      80    31   Monthly Record: 104
    INDIO             109   100 IN 2004      81    31   Monthly Record: 104
    THERMAL           110   101 IN 2004      82    32   Monthly Record: 103
    BORREGO           108    97 IN 1997      80    26   Monthly Record: 101

Here are a list of locations currently forecast to break/tie
monthly highest low temperature records Wednesday through Friday:

Friday:


             FORECAST LOW   RECORD  YEAR

    RIVERSIDE          68     58 IN 1995 Monthly Record: 66
    LAKE ELSINORE      63     57 IN 1940 Monthly Record: 61
    ALPINE             71     58 IN 2001 Monthly Record: 63
    IDYLLWILD          64     45 IN 2017 Monthly Record: 50
    LAKE CUYAMACA      65     51 IN 2017 Monthly Record: 55
    PALM SPRINGS       76     69 IN 1932 Monthly Record: 70
    THERMAL            71     68 IN 1989 Monthly Record: 69
    BORREGO            72     65 IN 2017 Monthly Record: 70

&&

.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 Friday 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 Saturday for Coachella
     Valley-San Diego County Deserts-San Gorgonio Pass near
     Banning.

PZ...None.

&&

$$

PUBLIC/CLIMATE...CO
AVIATION/MARINE...Villafane