Marine Weather and Tide Forecast for Union City, CA

SHORT TERM
Issued at 124 PM PDT Tue Apr 14 2026 (This evening through Wednesday)

Low level stratus is breaking up across the Bay Area with sunny skies to continue into the afternoon/evening. Another round of stratus is expected tonight along the coast and portions of the SF Bay Shoreline. Locally patchy fog remains possible tonight across the interior valleys, particularly across the North Bay Valleys and southern Salinas Valley. The upper level pattern remains fairly stable in the short term as a deep upper level trough moves into the PNW and more meridional flow (becoming slightly troughy on Wednesday) prevails over California. This will result in Tuesday looking fairly similar to Monday with coastal highs in the 50s to 60s, interior highs in the 60s, and portions of the interior Central Coast in the low 70s. Morning low temperatures will be in the 40s to low 50s with portions of the interior Central Coast and the elevated terrain dropping into the upper 30s. Diurnally breezy onshore winds continue through Wednesday with gusts to around 20 to 30 mph across favored gaps/passes and along the coast in the afternoon/evening. There is some potential for coastal drizzle on Wednesday but if any does occur no accumulation is expected.

LONG TERM
Issued at 124 PM PDT Tue Apr 14 2026 (Wednesday night through next Monday)

There is a slight pattern change Wednesday night into Thursday as a high amplitude ridge moves into the West Coast. This will bring gusty offshore (northerly) winds across the region with gusts between 30-40 mph across the highest peaks. Winds will be strongest across the North Bay Interior Mountains and the interior East Bay.
Fire concerns remain minimal thanks to the recent wetting rains across the region last weekend. Winds shift onshore again by Saturday and continue through the remainder of the Long Term Forecast. High temperatures will see a gradual warming trend Thursday into the weekend with highs building back into the mid to upper 70s across the interior and 60s along the coastline. By Sunday, the upper level ridge will have progressed eastward and another deep upper level trough will move into the West Coast. This low is coming from the Gulf of Alaska and will bring us our next round of rain. The highest rain totals look to be in the coastal mountain ranges with lower amounts expected across the rest of the Bay Area and Central Coast. Temperatures will cool Sunday and Monday with interior highs in the 60s to low 70s on Sunday dropping into the low to mid 60s on Monday. Coastal high temperatures will remain in the 50s to 60s. Gusty onshore winds are possible Sunday into Monday as this next system arrives but it does not meet Wind Advisory Criteria.

AVIATION
(18Z TAFS)
Issued at 1144 AM PDT Tue Apr 14 2026

Low level lift and ample moisture led to a strato-cu kinda day.
Onshore flow and persistent cloud feed from the Pacific will keep a mix of MVFR (2000-3000 FT CIGS) to VFR through the 19-20Z time period. It will take some time, but do expect mostly VFR this afternoon with a few lingering CU. Tonight will be lower conf given lingering low moisture increasing high level clouds. For STS/APC did not include dense fog like this AM....thinking increasing high clouds will limit radiational cooling (10-20% chc). For the Wed AM rush do have some MVFR CIGS returning 1500-2500 FT. Winds are forecast to increase throughout the day into the evening before tapering down through the night. HAF is an exception as it will maintain moderate winds with some embedded gusts through the TAF period due to its close proximity to the coastline.

Vicinity of SFO...Strato-cu is slow to mix out. Trending later in the 19-20Z block for the Bay. Do expect an uptick with onshore winds this afternoon with better clearing. Gusts 20-25 kt.

SFO Bridge Approach...Solid deck of strato-cu. May clear a little later than SFO terminal.

Monterey Bay Terminals...Gradual thinning of strato-cu with similar clearing in the 19-20Z. Onshore flow will bring some MVFR cigs back again tonight.

MARINE
(Today through Sunday)
Issued at 1059 AM PDT Tue Apr 14 2026

High pressure off the California coast will maintain moderate to fresh northerly breezes over the coastal waters today. Locally stronger gusts will occur near Point Reyes and Point Sur regions.
A cold front will increase winds to near gale force late Wednesday or early Thursday, building rough seas. Winds and seas ease into the weekend, but build again into the next work week with some chances for rain.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 PM PDT this evening for Mry Bay- Pigeon Pt to Pt Pinos 0-10 nm.

Small Craft Advisory from 9 PM Wednesday to 3 AM PDT Thursday for Mry Bay-Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory until 3 AM PDT Wednesday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory until 3 AM PDT Wednesday for Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory from 3 PM Wednesday to 3 AM PDT Thursday for Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 3 AM PDT Thursday for Pt Pinos to Pt Piedras Blancas 0-10 nm.