Date: September 21, 2026 | Time: 1:40 PM PDT
San Mateo County coast is experiencing typical late-season conditions today with moderate coastal fog clearing toward the early afternoon. Across coastal locations including Half Moon Bay, Pacifica, and Pescadero, current air temperatures are averaging 62°F with high temperatures reaching around 65°F along the immediate coast and up to 72°F inland. Winds are predominantly out of the northwest at 10 to 15 knots, with gusts increasing up to 20 knots near exposed points during the late afternoon hours.
Ocean conditions and nearby buoy readings show a dominant northwest swell across regional waters. Station 46012 off Half Moon Bay reports a primary swell direction from the northwest (310°) measuring 4.5 feet at a period of 9 seconds, along with a secondary background swell from the south-southwest (195°) measuring 1.5 feet at 16 seconds. San Francisco Bar buoy reports combined seas averaging 4 to 6 feet. Water temperature along the San Mateo coastline remains brisk, averaging 58°F to 60°F.
Tide conditions for Half Moon Bay and surrounding beaches feature a low tide of 0.8 feet at 7:15 AM PDT, followed by a high tide of 4.9 feet at 1:45 PM PDT. A secondary low tide of 1.2 feet occurs later at 7:30 PM PDT.
The outlook for tomorrow indicates strengthening northwest winds reaching 15 to 20 knots by afternoon, which will build seas up to 7 to 9 feet. A small craft advisory is expected to take effect as rough marine conditions develop through midweek.
raw data from noaa, curated by surforecast pacificwaverider