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Rancho San Joaquin, Irvine, CA 92612
Weather Conditions Updated at 2:56pm on 9/28/21
Sky Temperature (°F) Wind 


Visibility 10 mi.

 72°


Temp Rate °/hr.
24-hr. Change °



Max Gust 6 mph
High Temperature 73° (2:31pm)
Low Temperature 65° (2:47am)
Humidity
High/Low

/
Dew Point
High/Low

Wet Bulb Temperature
 
/
 
Rainfall Since Midnight
Pressure

24-hour Change
29.90 in. 

Cloud Base ft.
Density Altitude
Pressure Altitude
Vapor Pressure 0.58 in.
Virtual Temperature 76°

Coastal Orange County Forecast

Meteoblue NowcastMarine ForecastArea Forecast Discussion

National Temperature Extremes

lign="center">
Monday, Contiguous 48 United States
 High: 
at Death Valley, CA  Low: at Peter Sinks, UT

Temperature Converter




Enter temperature in either box and press [TAB].

°F  °C

Station Statistics

 
Station Location and Elevation
Rancho San Joaquin, Irvine, CA  92612
Latitude: 33.663, Longitude: -117.830
Elevation: 72 Feet Above Sea Level


Station Temperature and Wind Extremes
This Month's High Temp (9/21/21)
This Month's Low Temp (9/19/21)
This Month's Peak Wind Gust mph (9/6/21)

This Year's High Temp (9/21/21)
This Year's Low Temp (1/26/21)
This Year's Peak Wind Gust: mph (1/25/21)

Record High Temp* (7/6/18)
Record Low Temp* (1/14/07)
Record Wind Gust* 47 mph (1/16/08)
Record Low Pressure*: 29.08 in. (1/21/10)
*Record for Irvineweather.net Since 3/1/2004


Solar Activity





Solar X-rays:  
Geomagnetic Field:  
Status
Status
 

Courtesy of n3kl.orgMt. Wilson Solar Tower Home Page
U.S. Fronts

Current U.S. Temperatures
Almanac
Sunrise  
6:46am
Moonrise 
11:41pm
Moon Phase

Illuminated
Sunset 
6:41pm
Moonset  
1:51pm
Heating° Days (Current) 0
Monthly Heating° Days (To Date): 5
Yearly Heating° Days (To Date) 1013
Cooling° Days (Current) 2
Monthly Cooling° Days (To Date) 176
Yearly Cooling° Days (To Date) 997
Wind Run (Current)  0.46 mi.
Wind Run Monthly (To Date) 31.81 mi.
Wind Run Yearly (To Date) 1644.13 mi.
Rainfall Sentinel
Last Measurable Rainfall
Monthly Rainfall (To Date)
Annual Rainfall (To Date)*
Last Year's Annual Rainfall* 10.67 in.
Normal Annual Rainfall* 13.33 in.
*Annual Rainfall is based on the California Water Year,
  which runs from October 1 through September 30.

Regional Observations




Weather Trend Graphs



              

Area Forecast Discussion
Expires:No;;318808
FXUS66 KSGX 281651
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
951 AM PDT Tue Sep 28 2021

.SYNOPSIS...
For today, high temperatures will remain below average and well
below average in the valleys. The deep marine layer will continue
with patchy morning drizzle for the coast and valleys. Stronger 
onshore flow will bring gusty southwest to west winds to the 
mountains and deserts during the afternoon and evening. Weak 
offshore flow on Thursday will bring much warmer conditions. It 
will be much drier inland with with locally gusty north to 
northeast winds along and near the coastal slopes of the 
mountains. Continued warmer with weak winds for Friday through the
weekend. Early next week, a weak low pressure system may move 
inland through California bringing cooling and more coastal low 
clouds.

&&

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

Update:

The marine layer became even deeper over the past 24 hours and is
over 4000 feet. Clouds have made their way all the way through the
mountain passes overnight and this morning. Drizzle occurred
overnight and this morning, mainly over the inland valleys and
along the coastal mountain slopes. A few hundredths of an inch
fell across these areas with the maximum observed rainfall over
the past 12 hours being 0.05 inches at Ramona.

The sounding profile does show less saturation within the marine 
layer and so we may see more clearing today, especially over the 
inland valleys, though confidence is low on just how much clearing
will occur. The coast will likely remain under considerable 
cloudiness and this is going on 4 days of limited to no sunshine
for much of the coast and valleys. A May Gray pattern here in
September! Of course sunshine continues to prevail over the
mountains and deserts, away from the influence of the marine 
layer.

No changes were needed to the forecast this morning. See previous
discussion below for more forecast details.

Previous Discussion (Issued at 339 AM PDT Tue Sep 28 2021):

.SHORT TERM (Today through Thursday)...
A trough of low pressure will move inland through the western
states today with stronger onshore flow for southern California. 
There will be stronger and gusty west winds of the mountains and 
deserts, strongest during the afternoon and evening with gusts to 
40 to 50 mph in the windier locations. 

There is also weak coastal eddy. The marine layer is near 3500 to
4000 feet with widespread coastal low clouds extending inland and
onto the lower coastal slopes of the mountains. Cloud bases are 
around 2000 feet MSl with a saturated layer around 1500 to 2000 
feet deep. There is once again patchy drizzle from the marine 
layer with the greatest coverage of light measurable amounts in 
the San Diego County valleys and the coastal foothills of the 
Santa Ana Mountains. 

Today will be another day with cooler than average high
temperatures with some of the valleys 10 to 15 degrees below
average. Warmer for the valleys on Wednesday as the marine layer
begins to decrease in depth.

For Thursday, there will be high pressure aloft over California
with weak offshore north to northeasterly flow across southern
California. Thursday will be warmer with the greatest warming for
the western valleys into the inland coastal areas. It will also be
much drier inland for the mountains, deserts, inland valleys, and
inland Orange County with lowest humidity falling to 5 to 10
percent.

There will also be locally gusty north to northeast winds along
and near the coastal slopes of the mountains during Thursday morning,
diminishing during the afternoon with the stronger gusts to 
around 35 mph. The lower level flow may have enough of a northerly
component such that the stronger and more widespread winds in the
local area will be near and below the Cajon Pass and near the 
coastal foothills of the Santa Ana Mountains with less wind for 
San Diego County. ECMWF ensemble guidance for Ontario has changed 
little with the bulk of the members supporting weaker winds with 
around 20 percent of members supporting moderate strength winds. 

The HRRR smoke model shows smoke and haze decreasing from the
northwest during the day today. More smoke and haze from the north
will spread south and southwestward across the area for late
tonight into Wednesday.

&&

.LONG TERM (Friday through Monday)...
Weak high pressure aloft will be across southern California on
Friday with a weak low pressure system approaching California from
the northwest. This may develop into a weak closed low off the
California coast for the weekend. Inland areas may continue to 
slowly warm for Friday through Sunday. There remains greater 
spread in the high temperature guidance for the coast and valleys 
though the deterministic NBM high temperatures for the coast and 
valleys don't change much through the weekend. Early next week, 
that weak low pressure system may move inland through California 
spreading cooling inland and bringing more coastal low clouds.

&&

.AVIATION... 
281533Z...Coast/Valleys...Low clouds based 1800-2800 feet MSL with 
tops to near 5000 feet MSL. Local 3-5sm in drizzle. Risk of low 
clouds all day today is moderate to high so moderate-high confidence 
in slow clearing today 17Z-20Z in the eastern valleys, 20Z-23Z 
western valleys and Orange County. Some locations remaining BKN/OVC 
within 10 miles of the coast, especially VCTY KCRQ/KSAN. Widespread 
cloud coverage looks fairly similar again tonight.

Mountains/Deserts...Mostly clear with unrestricted vis through Tue 
night. Terrain obscurations will occur at times in clouds/fog 
through 18Z Tue on the coastal slopes below 5000 feet MSL. Areas of 
west surface winds 20-30 knots with gusts to 45 knots will develop 
on the desert mountain slopes and through San Gorgonio Pass Tue 
after 18Z and continue Tue night. Areas of the high desert and 
KPSP/KTRM gusting close to 25 kts at times.

&&

.MARINE...
Northwest winds will increase Tuesday afternoon over the outer 
coastal waters, with a few gusts over 20 knots possible. Otherwise, 
no hazardous marine weather is expected through Saturday.

&&

.BEACHES...
A long-period south-southwest swell and a modest west-northwest 
swell will bring elevated surf and a high rip current risk to the 
beaches into through Wednesday. Widespread surf of 2 to 4 feet 
expected with sets up to 5 feet in San Diego County. Surf will 
subside slightly toward the end of the work week.

&&

.FIRE WEATHER...
A low pressure system moving inland through the western states
today will bring gusty southwest to west winds to the deserts onto
the desert slopes of the mountains. Winds in the windiest
locations will gust to 4o to 50 mph during the afternoon. The
winds will diminish from north to south during the evening.

For Thursday, high pressure aloft will be over California with 
weak offshore flow for southern California. It will be much
warmer, and much drier inland with humidity falling to 5 to 10
percent in portions of the deserts, mountains, inland valleys, and
inland Orange County. 

There will also be locally gusty north to northeast winds along 
and near the coastal slopes of the mountains. The winds will be 
most widespread during the morning, then diminish in the 
afternoon. The lower level flow may have enough of a northerly
component such that the stronger and more widespread winds in the
local area will be near and below the Cajon Pass and near the
coastal foothills of the Santa Ana Mountains with less wind for
San Diego County. ECMWF ensemble guidance for Ontario has changed
little with the bulk of the members supporting weaker winds with
around 20 percent of members supporting moderate strength winds. 

The combination of wind and low humidity will bring elevated fire
weather conditions on Thursday along and near the coastal slopes
of the mountains.

Continued warmer and very dry for Friday, but with weak winds.
There may be a slight recovery in humidity for the weekend. A weak
low pressure system may move inland through California early next
week spreading cooling inland and bringing a greater recovery in
humidity. 

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&

$$

PUBLIC...Gregoria (Update)/17 (Previous Discussion)
AVIATION/MARINE...Small





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Acknowledgements:

Radar courtesy of NWS and WUnderground
Satellite courtesy of NWS
U.S. Fronts map courtesy of Weatherforyou.com
Current Temperatures map courtesy of WeatherStreet.com
Local Forecast courtesy of meteoblue.com
Wind direction image courtesy of Long Beach, WA Weather
Regional Observations courtesy of WeatherForYou.com

(You knew this was coming!) Never base important decisions on this or any weather information obtained from the Internet.
This site reports weather observed at the Rancho San Joaquin village of Irvine, California.
We are not affilliated with the Rancho San Joaquin Golf Course, the Rancho San Joaquin Homeowner's Association
nor the Rancho San Joaquin Apartments.
So there!



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