FXUS66 KMTR 301933
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1233 PM PDT Sun Aug 30 2026

...New SHORT TERM, LONG TERM...

.KEY MESSAGES...
Updated at 1232 PM PDT Sun Aug 30 2026

 - Slight chance for coastal drizzle during the night and morning
   hours through Tuesday morning

 - Cooling trend continues through at least midweek

&&

.SHORT TERM...
Issued at 1232 PM PDT Sun Aug 30 2026
(This evening through Monday night)

Stratus has retreated to the coast as of early afternoon with 
mostly sunny skies across the interior. Thus, temperatures inland 
temperatures will warm into the 70s to mid 80s and the lower 90s 
across the far interior. Meanwhile, persistent onshore flow and 
the marine layer will maintain cooler conditions near the coast, 
generally reaching into the 60s. 

The marine layer is likely to deepen overnight to around 2000 
feet and with an increased potential for coastal drizzle tonight 
and into midmorning on Monday. Expecting a slower clearing of 
stratus Monday morning as troughing off of the Pacific Northwest 
coast develops and deepens. As such, afternoon maximum 
temperatures will be 5 to 15 degrees below average. Heading into 
Monday night, another round of night/morning drizzle is expected 
along the coast and in the favored upslope regions. 

&&

.LONG TERM...
Issued at 1232 PM PDT Sun Aug 30 2026
(Tuesday through next Saturday)

Tuesday is now forecast to be the coolest day of the week with 
afternoon temperatures some 10 to 20 degrees below normal for this
time of year. Temperatures remain below seasonal averages 
throughout much of next week with the potential for rain 
particularly across the North Bay late week as a weak frontal 
boundary sags southward across the region. This is as a cut-off 
low develops off of the northern California coast Tuesday with 
troughing persisting through the remainder of the week and 
potentially into next weekend. Still keeping an eye on the 
tropical eastern Pacific as it remains fairly active for any 
moisture that may be brought northward into California. 

&&

.AVIATION...
(18Z TAFS)
Issued at 1143 AM PDT Sun Aug 30 2026

Widespread VFR with clear skies prevails this afternoon as moderate 
onshore winds increase. The marine layer was about 200 feet deeper 
this morning compared to yesterday (1400 ft to 1600 ft) and will 
continue to deepen tonight, resulting in MVFR ceilings at most 
terminals. Low confidence on whether stratus will reach the interior 
East and South Bay valley terminals, therefore the TAF hints at the 
potential with SCT decks. Coastal sites develop low-end MVFR 
ceilings around sunset, meanwhile the rest of the sites develop MVFR 
ceilings overnight. Stratus should recede to the coast by late 
Monday morning. Overall, medium confidence on the exact arrival of 
stratus.

Vicinity of SFO...VFR prevails this afternoon with moderate westerly 
breezes. Decreased potential for strong gusts this afternoon, though 
cannot fully rule out an occasional 20 kt gust. As winds ease 
overnight, MVFR stratus is expected to develop at both SFO and OAK 
which then persist until late Monday morning as moderate winds 
increase.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Northwest to west winds prevail through the 
TAF period. VFR conditions this afternoon with medium confidence for 
MVFR ceilings to develop right before sunset, though they may arrive 
as late as 9 PM PDT tonight. Stratus persists overnight with the 
potential for coastal drizzle early Monday morning. If coastal 
drizzle occurs, anticipate a reduction to visibility around 4-6SM. 

&&

.MARINE...
(Today through Friday)
Issued at 918 AM PDT Sun Aug 30 2026

Northwest breezes remain fresh with strong to near gale force 
gusts today and gradually diminish to gentle breezes by Monday. 
Wind driven rough seas subside to moderate by Monday into the rest
of the week. The long period southerly swell also decreases today
into early Monday morning.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 AM PDT Monday for Pt Arena to Pt 
     Reyes 0-10 nm.

     Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt 
     to Pt Pinos 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm.

     Small Craft Advisory until 9 AM PDT Monday for Pt Arena to Pt 
     Reyes 10-60 NM.

&&

$$

SHORT TERM...RGass
LONG TERM....RGass
AVIATION...Navarrete
MARINE...Navarrete

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Prepared by Boulder-Creek.com Weather at: Sun Aug 30 14:30:03 PDT 2026