After a cold morning Saturday, temperatures trend upwards each day over the weekend through Monday. Fair, dry, and warm weather likely persists through next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
Clear skies across nearly the entire region this evening, a marked difference from the rest of this week. Isolated areas of ground fog are possible late tonight, mostly in sheltered valleys like Ramona. Otherwise, clear skies and drier air will lead to efficient radiative cooling tonight, and cold overnight and morning temperatures. Inland valleys will be cold and stable enough that patchy frost will develop in areas overnight, especially the Inland Empire.
After a chilly morning, Saturday's afternoon temperatures will be noticeably warmer than today's, the start of a warming trend that will extend into next week. Mostly clear skies Saturday morning will give way to increasing upper-level clouds in the later afternoon, brought by a large low pressure system well to our northwest over the eastern Pacific. For more details, see the previous discussion below.
.PREVIOUS DISCUSSION, Issued 251 PM PST Fri Feb 20 2026, Weak high pressure aloft develops for this weekend, and there is also an offshore pressure gradient that develops tonight and lasts through Saturday. That will produce areas of gusty easterly winds through the peninsular mountains locally into inland valleys. That will boost the warming trend west of the mountains. The offshore flow weakens a little on Sunday, but the warming trend continues into Monday. High temperatures will be in the 60s Saturday, 70s Sunday, and a few spots should hit 80 degrees Monday. Skies will have periods of high clouds, but the Sun will shine through most of the time. Our upper ridge of high pressure over California will amplify some next week. A plume of moisture tries to approach SoCal next Wednesday, but now nearly all model guidance steers that moisture into northern and central California. Confidence is nearly 100% that SoCal will stay dry through at least Friday. It will be a little cooler Tuesday through Thursday as weak onshore flow returns, but still well above normal. The ridge appears to amplify later next week, which if it does, could produce widespread temperatures in the 80s in the valleys, and lower 90s in the low desert on Friday.
210400z, Mostly VFR conditions will prevail through the TAF period. Patchy radiation FG tonight, mostly confined to wind-sheltered valleys (i.e. KRNM, KL18). Currently not expecting any impacts to TAF sites. SCT-BKN high clouds around 25kft after 00Z Sun.
No marine hazards are expected through Wednesday evening.
Ca, None. PZ, None.
