Marine Weather and Tide Forecast for Colma, CA

SHORT TERM
(This evening through Sunday)
Issued at 219 PM PDT Sat Jun 21 2025

Winds are building into the afternoon. However, the updated forecast is showing that the widespread wides are going to be weaker overall than the winds experienced yesterday, with only a few exceptions along the immediate coast. Temperatures are mostly around average today as the onshore flow continues and today looks to be the coolest of the next seven. Winds over land reduce into the evening and early tonight, but will stay gusty within the marine environment.

The reduction of winds tonight marks the end of our breezy to gusty pattern and pulls the interior areas out of near critical fire danger. However, a lot of the finer fire fuels (grasses and small plants) have dried and cured in the last few days of dry, sunny and windy conditions, so we urge folks to stay fire weather aware.

LONG TERM
(Sunday night through next Friday)
Issued at 219 PM PDT Sat Jun 21 2025

Winds have been the big focus of the forecast over the last few days, but as the upper level pattern changes, the breezy and gusty conditions are mostly going to be focused over the marine environment into the next work week.

Said change in the upper level pattern with feature the upper level pushing east and slightly south. This will reduce onshore flow into the mid week and weaken winds across the region. Temperatures will increase in the far interior, while the coast and slightly inland areas stay mostly unchanged as marine stratus and fog begin to reestablish in the calmer conditions. As of the current forecast, Thursday looks to be the warmest day of the forecast as the more interior valleys settle into the 90s and some of the warmest of the warm hitting the 100 degree mark, but this won't be widespread and the coastal and slightly inland areas remain in the 60s and 70s.

Something to note, the mid-week model agreement is fair with the current official forecast, but some models hint at the trough pushing farther south and propagate in such a way that could introduce more offshore flow. This will still result in the midweek warm up, but the drier flow could limit the marine layer and coastal cloud cover, making for a much warmer days for the coast. The forecasting team will be keeping an eye on how this continues to develop over the next few forecast updates, be sure to keep checking back in!



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
(Tonight through next Thursday)
Issued at 219 PM PDT Sat Jun 21 2025

Widespread hazardous marine conditions persist over the waters through early Sunday morning, with near-gale north breezes, severe gale force gusts, and rough to very rough seas. The bays will be more sheltered, but will still experience fresh to strong northwest 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 221 PM 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 mph, perhaps locally higher at exposed elevations and wind prone gaps. Breezy to gusty winds look to hold through Saturday night. There should be some improvement in humidity into Sunday morning, 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.

Small Craft Advisory from 3 PM to 9 PM PDT Sunday for Mry Bay.

Gale Warning until 3 AM PDT Sunday for Pigeon Pt to Pt Pinos 0- 10 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.

Gale Warning until 9 AM PDT Sunday for Pigeon Pt to Pt Pinos 10-as well60 NM.