textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1205 AM PDT Fri Jul 3 2026

- Marine layer will remain in place each day, retreating to the coast for many each afternoon. Under such conditions, temperatures will remain seasonally cool along the coast with a slight warmup for inland locations.

- A brief cooldown will be seen at the start of the upcoming work week, with a warmup expected in the middle of next week. There will be low-end chances for some inland locations to see Moderate (orange) HeatRisk.

SHORT TERM

Issued at 1205 AM PDT Fri Jul 3 2026 (Today and Saturday)

Upper trough over the West Coast breaks down early on Friday, with a brief period of weak flow aloft. As we progress through the day on Friday, we will start to see height rise over the area, with warming temperatures aloft. Marine layer will remain in place for most coastal locations, with some breaks allowing for the sun to peak through. Although, with the marine layer and onshore winds in place, temperatures will be similar to previous days in the 60s. Inland areas will see some warming compared to previous days, with some locations seeing a 3-5 degree increase compared to Thursday. Overall, a pleasant day is ahead of us with Minor (yellow) HeatRisk for inland locations and Low (green) along the coast.

Saturday, we will see similar conditions with slight height rises continuing through the day. This will once again result in slightly warmer conditions through the afternoon hours for inland locations, generally seeing a 1-3 degree increase compared to Friday. This would bring inland locations closer to the mid 80s, with some reaching the upper 80s. Coastal locations will largely remain in the low-mid 60s. One of the more notable changes is the increase in cloud cover through the afternoon hours on Saturday, especially for locations south of San Francisco. While there will be the chance for mostly clear conditions earlier in the day, the forecast will trend towards mostly cloudy skies by mid afternoon. This may lead to some fluctuations in the forecast high temperatures.

LONG TERM

Issued at 1205 AM PDT Fri Jul 3 2026 (Sunday through Thursday)

Sunday through Monday, we will see a weak upper shortwave move into the area from the southwest. This will bring another period of seasonally cool weather to the area. As was seen last week, this will result in a persistent marine layer each night/morning, which may remain over coastal locations through much of the daytime period. Although, some breaks in the clouds will be possible. Breezy conditions will also be in place as this wave passes through.

Tuesday and beyond, a potent wave will start to dig into the Pacific Northwest while a ridge starts to build over the California coast or just off the coast over the Pacific. There remains uncertainty amongst global guidance on where this ridge axis will set up, which may result in some subtle forecast differences as we get closer. In either case through, we will see height rises over the region with warming temperatures aloft. In time, flow over California will generally be zonal at 500 hPa. With this pattern in mind, it would seem like are are going to enter another warming regime midweek and beyond , especially for inland locations. CPC supports this, indicating favorability for above normal temperatures over the region. Overall, we are looking at mid-upper 80s for interior locations, with some in the low 90s not out of question. While not a large signal at this time, there will be the chance for isolated inland locations to see Moderate (orange) HeatRisk conditions through this stretch. Otherwise, much of the area will range from Low (green) to Minor (yellow) HeatRisk. This will also be a period of breezy conditions, with onshore wind gusts between 20 to 25 mph at times.

AVIATION

(06Z TAFS) Issued at 945 PM PDT Thu Jul 2 2026 The stratus is filling in as expected this evening and is generally coming in a few hundred feet lower than yesterday at this time. This may bring some more IFR conditions tonight. Clouds are expected to push back to the coast again Friday afternoon much like today. Onshore west/southwest winds will increase once again Friday afternoon, becoming breezy at the usual wind-prone terminals, although in general they look slightly lighter than today. Stratus will redevelop overnight with the return of MVFR/IFR ceilings to some terminals. Ceilings may continue to lower Friday night as high pressure builds in.

Vicinity of SFO...Tonight generally expect conditions to be persistent and skies to remain VFR. However there is a 30 percent chance of clouds below 2000 feet briefly towards morning. VFR along with breezy west/southwest winds are expected in the afternoon. Friday night the probability of CIGS returning at SFO increase to around 50 percent.

SFO Bridge Approach...Similar to SFO.

Vicinity of SJC and OAK...Stratus has started to develop in the hills east of KOAK and this is expected to spread down into the terminal again tonight. These may drop into IFR category towards morning. VFR conditions are expected to return in the morning along with the typical west to southwest winds. For SJC, drainage southeast winds through around 21Z, then becoming northwest. Redevelopment of MVFR or IFR ceilings at OAK is likely again Friday night.

Monterey Bay Terminals...MVFR Ceilings have returned and these may drop for a period of time to IFR towards morning. Gusty onshore winds are expected to return in the afternoon with skies becoming VFR late morning or midday again. The stratus is expected to return quickly again Friday evening and could come in IFR or close to it.

MARINE

(Tonight through next Wednesday) Issued at 917 PM PDT Thu Jul 2 2026

Northwest winds will remain breezy to gusty across the northern outer waters through early Saturday while winds ease across the rest of the waters. Seas will abate to become moderate to rough today and Friday. Winds and seas look to build again into the middle of the next work week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory until 3 AM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM.