Marine Weather and Tide Forecast for Belvedere, CA

UPDATE
Issued at 850 AM PDT Sat Jun 21 2025

Skies are generally clear on this first full day of astronomical summer. The forecast remains on track with gusty winds and dry afternoon humidities resulting in elevated fire weather threat for the interior through the day into the early part of Sunday morning.

DialH

SHORT TERM
(Today and tonight)
Issued at 400 AM PDT Sat Jun 21 2025

The forecast remains on track with an upper level low tracking into the Great Basin, deepening the larger upper level trough. Flow will remain onshore with gusty winds picking back up by mid to late morning. The pressure gradient looks to support another gusty day with gusts peaking 25-35 mph, with gusts up to 40 mph, or locally higher. for areas along the coast or at wind prone gaps and passes. The forecast looks to remain dry, especially for areas above the marine layer where recovery is expected to be poor. The marine layer should be around 1500-2000ft. Given these conditions and cured grasses and dried shrubbery, elevated fire weather countdowns will continue.

LONG TERM
(Sunday through Friday)
Issued at 400 AM PDT Sat Jun 21 2025

Saturday evening into Sunday morning, winds look to remain breezy before beginning to ease. Upper level troughing looks hold, though a perturbation forms causing the through to deepen a bit more over Central CA. This then looks to essentially park itself over CA and NV through midweek with more zonal flow returning mid to late week.
Weather should generally be more typical for this time of year, seasonable temperatures, nighttime and morning stratus, and generally quiet weather.

AVIATION
(18Z TAFS)
Issued at 1012 AM PDT Sat Jun 21 2025

Generally VFR conditions continue through the day. Strong northwest gusts develop this afternoon and continue through early Sunday morning, before diminishing through Sunday morning past the end of the 24-hour TAF period. Some high resolution model data has stratus returning to the immediate coast tonight into Sunday morning, but this is a low confidence forecast and the HAF and MRY TAFs remain VFR throughout.

Vicinity of SFO... VFR through the TAF period. Strong northwest gusts will develop later today, with moderate confidence that the gusts reach 35 kt sometime today. Greatest probability for gusts reaching 35 kt will be sometime between 22 and 03Z. Strong gusts will abate overnight, before gusts around 25 kt develop Sunday afternoon.

SFO Bridge Approach... Similar to SFO.

Monterey Bay Terminals... VFR through the day with strong northwest gusts developing this afternoon. Winds diminish late this evening through the overnight period with a low confidence for stratus at MRY. Northwest winds will redevelop late Sunday morning and afternoon.

MARINE
(Today through Thursday)
Issued at 850 AM PDT Sat Jun 21 2025

Widespread hazardous marine conditions are expected over the waters through early Sunday morning in the form of near-gale northerly breezes, severe gale force gusts, and rough to very rough seas. The bays will be more sheltered, but will still experience fresh to strong northwesterly breezes. Winds will subside on Sunday, with fresh to strong northwest gusts and moderate to rough seas through the end of the next work week.

FIRE WEATHER
Issued at 557 AM PDT Sat Jun 21 2025

Elevated to near critical fire weather conditions continue today across the interior Central Coast, East Bay Hills, and interior North Bay as another dry day with moderate to poor RH recovery is expected for interior locations and areas of higher elevation, especially for those above the marine layer. Winds will be breezy to gusty as well, peaking around 35 to 45 mph, perhaps locally higher at exposed elevations and wind prone gaps. Breezy to gusty winds look to hold through Sunday morning, with winds gradually easing throughout the day. There should be some improvement in humidity as well, especially if the marine layer is able to deepen. Widespread critical fire weather conditions are not expected within the district today, although the fire weather threat will increase once again for areas closer to the Central Valley. The fire weather threat will continue to diminish Sunday into the early part of next week with the gusty winds further relaxing, although humidity values in the interior will be slow to rise.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 3 AM PDT Sunday for Mry Bay-SF Bay N of Bay Bridge.

Gale Warning until 3 AM PDT Sunday for Pigeon Pt to Pt Pinos 0- 10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0- 10 nm-Pt Arena to Pt Reyes 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.