Cobblestones Surf Forecast and Surf Report

Alright, cobbers, Rusty here with the regs version.

We’ve got a slow start this week; the coming days are messy, but there’s a real pulse of groundswell building for the middle of the run. Water temp is sitting at about 64°F with an anomaly of 2°F, so pretty average for this time of year – no major surprises there.

Sunday the 13th is a write-off. Strong cross-onshore winds and a lumpy 10ft to 12ft swell mean the bay is a washing machine. Don’t bother.

The first real window opens Monday morning (14th September). The swell settles at 12ft from the SW with a solid 14-second period, and light SE cross-offshore breezes will keep it clean. Combined wave energy is pumping hard at 5483 (moderate to strong energy). This is for experts only at this size, but the power and shape will be there. That morning is the standout of the first week.

Tuesday morning (15th) holds clean 10ft SW swell with offshore ENE wind at 6 mph. Combined energy is still strong at 4036. Another quality session for the experienced crew.

Things drop off Wednesday and Thursday (16th & 17th) – the swell backs down to 5ft – 6ft, but the winds are messy or cross-shore. Not worth the paddle.

Friday afternoon (18th September) is a gem. The swell lifts back to 10ft from the WSW with the period stretching to 16 seconds – that’s very long period groundswell. Combined energy hits 5086. With a light offshore NE breeze, this will be glassy and lined up. Again, expert-only territory.

The weekend (19th & 20th) is blown out again with strong onshore winds and lumpy conditions. We get a mixed bag Monday and Tuesday (21st & 22nd) with solid 12ft – 13ft SW swell but cross-shore winds. It stays clean enough for a wave, but it’s not top-tier.

Now, the true standout is Wednesday afternoon (23rd September). Swell jumps to 13ft from the SW with a very long 17-second period, and the combined wave energy is massive at 8644 (strong to very strong). Wind is nearly glassy from the WSW at just 3 mph. For experts, this is as good as it gets – peak groundswell, clean, and powerful. That’s the one to wait for.

After that, a series of strong onshore winds and rain spoils the end of the month, and the last couple of days drop off in size. Sunday the 27th sees a sudden spike in the afternoon with an 18ft swell from the WNW, but at 12 seconds and with cross-offshore wind, it's gonna be big and unruly. Not for the faint-hearted. The final morning on Monday 28th September hangs on with 15ft WSW swell and clean offshore ENE wind, a solid but demanding end.

Best on offer: Monday morning (14th) for the first clean window, and Wednesday afternoon (23rd) for the absolute best combination of power and glass.

Rusty.

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