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Tustin, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Tustin CA
National Weather Service Forecast for: Tustin CA
Issued by: National Weather Service San Diego, CA
Updated: 1:21 pm PDT Jun 10, 2025
 
Tonight

Tonight: Mostly cloudy, with a low around 62. South wind around 5 mph.
Mostly Cloudy
Wednesday

Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 81. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Decreasing
Clouds
Wednesday
Night
Wednesday Night: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 63. Southwest wind 5 to 10 mph becoming light  in the evening.
Patchy Fog
Thursday

Thursday: Patchy fog before 11am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Patchy Fog
then Sunny
Thursday
Night
Thursday Night: Increasing clouds, with a low around 63. Southwest wind around 5 mph becoming calm  after midnight.
Increasing
Clouds
Friday

Friday: Mostly sunny, with a high near 81.
Mostly Sunny
Friday
Night
Friday Night: Increasing clouds, with a low around 63.
Increasing
Clouds
Saturday

Saturday: Mostly cloudy, with a high near 84.
Mostly Cloudy
Saturday
Night
Saturday Night: Patchy fog after 11pm.  Otherwise, partly cloudy, with a low around 64.
Patchy Fog
Lo 62 °F Hi 81 °F Lo 63 °F Hi 82 °F Lo 63 °F Hi 81 °F Lo 63 °F Hi 84 °F Lo 64 °F

 

Tonight
 
Mostly cloudy, with a low around 62. South wind around 5 mph.
Wednesday
 
Mostly cloudy, then gradually becoming sunny, with a high near 81. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Wednesday Night
 
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 63. Southwest wind 5 to 10 mph becoming light in the evening.
Thursday
 
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
 
Increasing clouds, with a low around 63. Southwest wind around 5 mph becoming calm after midnight.
Friday
 
Mostly sunny, with a high near 81.
Friday Night
 
Increasing clouds, with a low around 63.
Saturday
 
Mostly cloudy, with a high near 84.
Saturday Night
 
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 64.
Sunday
 
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86.
Sunday Night
 
Patchy fog. Otherwise, partly cloudy, with a low around 65.
Monday
 
Patchy fog. Otherwise, mostly sunny, with a high near 85.
Monday Night
 
Patchy fog. Otherwise, partly cloudy, with a low around 64.
Tuesday
 
Patchy fog. Otherwise, mostly sunny, with a high near 83.

 

Forecast from NOAA-NWS for Tustin CA.

Weather Forecast Discussion
147
FXUS66 KSGX 110427
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
927 PM PDT Tue Jun 10 2025

.SYNOPSIS...
Slow cooling Wednesday through Friday, then high pressure to the
south will bring around 5 degrees of warming for the weekend
followed by slow cooling for early next week. Night and morning
coastal low clouds will continue to spread into portions of the
valleys, then become patchier and less extensive for the weekend
as the marine layer becomes shallower.

&&

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

Evening update...
It was a hot day inland with highs around 100-106 in the deserts.
As suspected, gulf moisture into the low deserts suppressed high
temperatures there though dew points were only in the mid 50s.
Marine layer low clouds are quicker to spread inland this evening,
already extending into parts of the western valleys. Elsewhere
skies are clear outside of wildfire smoke near Apple Valley. No
changes to the forecast this evening, though with southeast
flow/gulf moisture continuing to spread into the lower deserts,
temperatures will likely be on the lower end of the ensemble
spread on Wednesday.

Previous discussion...
A semi-permanent low pressure system over the Gulf of Alaska with
a series of shortwave troughs embedded in the flow over CA will
weaken the high pressure and shift the ridge to the east and south.
Along with a little stronger onshore flow, this could result in
slight cooling for Wednesday through Friday. High temperatures on
Friday will be mostly within a few degrees of average for the
coast and valleys with the deserts around 5 degrees above average.
High temperatures on Friday will range from around 70 near the
coast to the 80s and lower 90s for the Inland Empire with 104 to
108 for the lower deserts. High resolution models indicate that
the marine layer becomes a little shallower with low clouds and
fog not spreading into the Inland Empire quite as much as it did
this morning.

The high pressure will reposition itself over AZ, NM and Sonora
Mexico by Sat, with the ridge amplifying over the Inter-Mountain
West. This will bring warming of around 5 degrees for the weekend,
with Sunday high temperatures mostly 5 to 10 degrees above
average. High temperatures on Sunday will range from the lower 70s
near the coast to the 90s for the Inland Empire with 108 to 112
for the lower deserts. Monday will be a few degrees cooler.
Current guidance indicates greater chances for patchier coverage
of night and morning coastal low clouds for the weekend with
coverage not extending inland much past the far western valleys as
the marine layer becomes shallower.

&&

.AVIATION...
100300Z....Coast/Valleys...Coastal San Diego/Orange Counties have
been overtaken by low clouds based 1000-1500 ft MSL. Expecting most
valleys in San Diego/Orange Counties to fill in overnight, but
should only reach western and southern portions of the Inland
Empire. Bases lower some to 700-1200 ft MSL after 06z allowing for
minor vis reductions (3-5 SM) for elevated inland areas. Low clouds
clear from inland areas 16-18Z Wed, and coastal areas gradually
clear 18-21Z, but linger along the immediate coast all day. Clouds
slowly start to move inland again after 00z Thursday with similar to
slightly lower bases.

Mountains/Deserts...Mostly clear skies and unrestricted vis today
and tonight.

&&

.MARINE...
No hazardous marine conditions are expected today through Sunday.

&&

.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...KW
AVIATION/MARINE...SS
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather








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