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Rancho Santa Margarita, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Rancho Santa Margarita CA
National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 8:47 pm PST Dec 29, 2024
 
Overnight

Overnight: Patchy dense fog.  Otherwise, partly cloudy, with a low around 45. Calm wind.
Patchy Dense
Fog
Monday

Monday: Patchy dense fog before 10am.  Otherwise, sunny, with a high near 67. Calm wind becoming west around 5 mph.
Patchy Dense
Fog then
Sunny
Monday
Night
Monday Night: Mostly clear, with a low around 47. North wind around 5 mph becoming calm.
Mostly Clear

Tuesday

Tuesday: Partly sunny, with a high near 68. North wind 5 to 10 mph becoming light and variable  in the morning.
Partly Sunny

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 46. Northeast wind around 5 mph.
Mostly Clear

New
Year's
Day
New Year's Day: Sunny, with a high near 72.
Sunny

Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 50.
Partly Cloudy

Thursday

Thursday: Sunny, with a high near 74.
Sunny

Thursday
Night
Thursday Night: Partly cloudy, with a low around 52.
Partly Cloudy

Lo 45 °F Hi 67 °F Lo 47 °F Hi 68 °F Lo 46 °F Hi 72 °F Lo 50 °F Hi 74 °F Lo 52 °F

Air Quality Alert
 

Overnight
 
Patchy dense fog. Otherwise, partly cloudy, with a low around 45. Calm wind.
Monday
 
Patchy dense fog before 10am. Otherwise, sunny, with a high near 67. Calm wind becoming west around 5 mph.
Monday Night
 
Mostly clear, with a low around 47. North wind around 5 mph becoming calm.
Tuesday
 
Partly sunny, with a high near 68. North wind 5 to 10 mph becoming light and variable in the morning.
Tuesday Night
 
Mostly clear, with a low around 46. Northeast wind around 5 mph.
New Year's Day
 
Sunny, with a high near 72.
Wednesday Night
 
Partly cloudy, with a low around 50.
Thursday
 
Sunny, with a high near 74.
Thursday Night
 
Partly cloudy, with a low around 52.
Friday
 
Mostly sunny, with a high near 72.
Friday Night
 
Partly cloudy, with a low around 49.
Saturday
 
Mostly sunny, with a high near 69.
Saturday Night
 
Partly cloudy, with a low around 49.
Sunday
 
Mostly sunny, with a high near 70.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.

Weather Forecast Discussion
358
FXUS66 KSGX 300507
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
907 PM PST Sun Dec 29 2024

.SYNOPSIS...
Low clouds and fog increasing in coverage tonight and Monday
morning west of the mountains, returning along the coast Monday
night and Tuesday morning. Offshore flow will develop Monday and
continue through Thursday, bringing gradual warming and much drier
conditions, with periods of Santa Ana winds, mainly Tuesday and
Wednesday. The warmest day of the week will be Wednesday when some
highs around 80 will occur in the valleys and lower deserts.
Cooler weather will return Friday and Saturday as a low pressure
trough approaches from the west.

&&

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

Some scattering out of the low clouds occurred this afternoon but
clouds are once again increasing in coverage and spreading farther
inland as a shortwave trough moves inland to the north and onshore
flow strengthens. Some height falls associated with the shortwave
trough and a coastal eddy could temporarily deepen the marine
layer tonight and result in more of the fog being in the inland
valleys and highest coastal terrain, and less near the coast.

From previous discussion...
Overall, the prevailing pattern Tuesday through Thursday will be
for surface high pressure over the northern Rockies with moderate
sfc pressure gradients to Southern California which will bring
the weak to moderate Santa Ana winds mainly through Wednesday,
and low humidity to the region. As low as 10 percent in some
inland areas, especially the Inland Empire. Wind potential is not
as great as previous model guidance suggested, with gusts mostly
around or below 40 MPH. Daytime temperatures will increase through
Thursday, with highs likely reaching 80 in warmest locations, but
nights will be chilly in wind-sheltered locations due to the low
humidity, with some 30s in colder valleys. A trough of low
pressure will move through the West Coast sometime late next week
or next weekend, but ensembles show little agreement on timing or
intensity of the trough. Less than 20% of ensemble solutions have
a small amount of precipitation, so especially with uncertainty
of timing, will leave precip out of the forecast for now.
Otherwise, a cooling trend should occur late this week with
redevelopment of coastal low clouds/fog.

&&

.AVIATION...
300430Z...Coast/Valleys...Very disorganized shrinking layer of
afternoon low clouds along the coast has made its transition into a
growing overnight patch earlier than anticipated. It is based near
900-1400ft MSL with a patchy layer of fog below with local
visibilities aob 3sm. These patchy visibilities near 1SM in fog
should impact the coastal airports late tonight into Monday morning.
Confidence in ceiling and visibility forecasts for late tonight at
the coastal sites in the TAFS is around 60%. Clearing on Monday will
occur at a similar time as Sunday, between 18z and 21z.

Mountains/Deserts...Mostly clear skies and unrestricted VIS will
prevail through Monday. Periods of gusty west winds for the desert
mountain slopes up to 30-35kts possible overnight, subsiding
by sunrise Monday morning.

&&

.MARINE...
The long period (17 second) northwesterly swell that  provided
seas of 5-8 feet in the outer coastal waters (30-60 NM from the
coast) and 3-6 feet in the inner waters (within 30 NM) should be
reduced Monday and throughout the week. Patchy fog over the
waters possible tonight into Monday morning, with visibility
dropping to near 2 NM at times. Local gusts near 20 kts expected in
the outer waters. Occasional gusts to 20-25 kts possible near San
Clemente Island. Winds should weaken late tonight.

&&

.BEACHES...
The long period (17 second) northwesterly (280-290 degree) swell of
3-5 feet will subside this evening, with elevated surf of 4-7 feet
remaining possible but decreasing overnight for San Diego
County beaches.

Minor coastal flooding will possible in vulnerable areas including
beach parking lots during morning high tides over the next few
days with tides peaking Tuesday/Wednesday near 7 feet.

&&

.FIRE WEATHER...
Weak northerly Santa Ana winds will develop Monday morning with
gusts to around 30 mph below the Cajon Pass. Minimum relative
humidity on Monday will be around 20-25 percent across the Inland
Empire, but as low as 8-12 percent in the mountains above 5500
ft. Winds will become more northeast Tuesday but with only slight
strengthening, and spreading into the Riverside and San Diego
County mountains and foothills. Minimum relative humidity will
drop to around 10-15 percent across the mountains, foothills, and
Inland Empire. Peak wind gusts Tuesday morning will be 30-40 mph,
mainly below the Cajon Pass and Santa Ana Mountains, and generally
around 20-30 mph in the remaining passes and foothills. The
period of time with gusts 35 mph or greater and relative humidity
15 percent or less for any location will likely be below 4
consecutive hours. Fire weather conditions will mostly just be
elevated and not critical Tuesday.

Weaker northeast to east winds will follow Wednesday and Thursday
with relative humidity in the teens during the afternoons.
Humidity will begin to recover somewhat Friday as onshore flow
returns.

&&

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

&&

$$

PUBLIC/FIRE WEATHER...Maxwell/PG
AVIATION/MARINE...Small
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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