Marine Weather and Tide Forecast for Colma, CA

SHORT TERM
Issued at 1123 PM PDT Thu May 7 2026 (Tonight through Saturday)

Widespread low clouds have pushed inland from the coast, covering the bays and into some of the interior valleys. Expect chances for pockets of fog overnight, with the strongest chances in the North Bay. The marine layer's influence will be stronger than last night, that along with the blanket of lower cloud cover will keep overnight temperatures mild. Most areas will see lows in the 50s and upper 40s. Only far interior valleys and higher peaks will see lows as cold as the mid 40s.

Friday will start on the cloudy side, and that cloud cover looks to linger into the late morning and even the early afternoon for some areas. The duration of the cloud cover will keep coastal and slightly inland areas on the cooler side compared to the areas that stay clear. Inland cloud cover will start clearing in the mid morning, however areas around the bays will keep cloud cover into the late morning and early afternoon. Portions of the immediate coast looks to keep cloud cover through the day with moderate to breezy winds. This will keep temperatures on the coast in the lower 60s, then the 60s and 70s for areas more inland, and into the 80s for areas not experiencing the morning cloud cover. A few areas in the far interior portions of Monterey Co look to break 90 degrees once again.

Friday night will see the affects of the building ridge to the north with a compression of the marine layer and a reduction in the overnight inland push of coastal stratus. This means that cloud cover will still be prevalent along the coast, but will struggle to enter the SF Bay and reach more of the inland areas. Additionally, the inland push of coastal stratus looks to be much later, more so into the night than the evening.

With a weaker marine influence, reduced cloud cover, and building ridge, many more of the inland areas to break into the 80s for Saturday. Coastal areas will stay low 60s, and the slightly inland areas stay in the 70s, but most areas away from the coast look to break 80. A few of the more inland areas look to break into the mid 90s than previous days.

LONG TERM
Issued at 1123 PM PDT Thu May 7 2026 (Saturday night through next Thursday)

The compression of the marine layer and building of the ridge continues Sunday and Monday, with Monday continuing to look like the hottest day of the forecast. For Monday itself: Most of the interior valleys look to break into the 90s with widespread 80s for all but the near-coastal areas seeing the 60s and 70s.

The ridge and increasing pressure will form a thermal belt, causing much warmer lows on the higher peaks (60s and a few 70s) and will allow for those peaks to break into the 90s for Monday afternoon.

Model trends continue to show notable cooling Tuesday, but it will still be on the hot side. The ridge begins to push east and a through deepens in the pacific leading to weak onshore winds along with a dissipation of the thermal belt.

From there, models split off in the movement of said trough. Some outputs place it in the Northwest, putting us into stronger zonal flow. Others place it farther south into the Bay Area, leading to drizzle and much cloudier conditions. Then there are some hits that the trough forms a cut off low in the middle of the Pacific, calling for continued weak onshore flow. Each of these scenarios call for a cool-down into the mid to late week, but offer fairly different magnitudes. Be sure to keep checking back as the forecast develops.

AVIATION
(06Z TAFS)
Issued at 1007 PM PDT Thu May 7 2026

Another night of MVFR to IFR stratus is expected again tonight, with stratus building along the coast and into the valleys. Stratus will continue to build into the region tonight, with stratus clearing late tomorrow morning. Though there could be lingering stratus into the early afternoon for some sites. VFR conditions should prevail into the afternoon and into the evening. The marine layer tonight and into tomorrow morning is expected to be around 1500-1800ft. It is expected 1200-1000ft by tomorrow evening and into Saturday morning. So stratus arrival might be a little delayed tomorrow evening.

Vicinity of SFO.. MVFR to IFR cigs are expected tonight and will clear by late morning. Winds may remain gusty with 18-22kt gusts expected over the next couple of hours, with 10-15kt winds expected overnight. Tomorrow, as cigs clear onshore flow returns. Expect breezy westerly winds around 15kt with gusts up to 25-30kt expected from 21Z to 4Z. There is some uncertainty if stratus will make it to SFO tomorrow night. Some guidance has this occuring around 9z, opted to hint at the possibility instead of locking in on it.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Stratus has returned this evening, which is accompanied with onshore flow. MVFR to IFR cigs are expected through the overnight hours, with cigs lifting late tomorrow morning. Gusty onshore winds return for the afternoon, especially around KSNS where they may get up to 15kt. Stratus should return to the southern half of Monterey Bay.

MARINE
(Tonight through next Wednesday)
Issued at 1007 PM PDT Thu May 7 2026

Fresh to strong northwest breezes will persist through the weekend with steadily building rough seas. The rough seas will begin to ease late Sunday into Monday, which is winds begin to decrease to moderate to fresh northerly breezes.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 PM PDT Sunday for Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.

Small Craft Advisory from 3 AM Friday to 9 PM PDT Sunday for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm.