Surf forecastStatisticsHistorical report

Middles seasonal overview

Best Surf Season (October - March)

The North Atlantic kicks into high gear from October through March, delivering the most consistent north-northeast swell to this north-facing beach. Average swell heights hover around 1.8-1.9m with periods frequently in the 9-10s range, offering powerful, long-period waves that can truly light up when the wind aligns. The real challenge? The dominant wind regime during these months is out of the east-northeast—a direct onshore flow that chops up the face. However, when a cold front sweeps through and winds clock to the southwest, the ocean grooms the lines into clean, orderly peaks. The ideal window is narrow (wind is perfect only 15-22% of the time), but the payoff is epic: thick, hollow walls that rewind the clock to classic point-break perfection.

Fair Surf Season (April, May, September)

As the jet stream retreats northward, the average swell height drops to 1.3-1.6m and periods settle into the 8-9s range. This is transitional territory. April and May see a significant uptick in offshore southerly wind days (ideal conditions reach 25-31%), which can turn even modest east-northeast swell into clean, rippable lines. The trade-off is that the north-northeast component of the swell becomes less frequent, so wave quality becomes more dependent on local sea breeze cycles rather than open-ocean storms. September offers a similar story: a late-summer spike in southerly wind frequency (30% ideal) coincides with the first north swells of autumn, making for a sneaky-good shoulder season where crowds thin and the ocean starts to wake up.

Low Surf Season (June - August)

Summer trades on the US East Coast are relentless. From June through August, the dominant wind howls out of the east-northeast more than 80% of the time, delivering a steady onshore flow that leaves Middles choppy, sectiony, and frustrating. Average wave heights drop to 1.3-1.4m and periods bottom out around 7-7.4s — short-period, wind-swell slop that struggles to organize on a north-facing beach. The swell direction is almost exclusively east to east-northeast (over 90% combined), which means waves approach at an oblique angle, offering only weak, closeout reformations. Offshore wind from the south is a rare event (13-18% of the time), and when it does arrive, it often comes with tiny, groveling conditions. This is the season to check in occasionally for a surprised glassy day, but the odds are stacked against you.

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Conditions at Middles in May

May: Wind Wins the Day

May sees the average swell height drop to 1.3m and period fall to 8.4s. The wave energy becomes almost exclusively east-northeast (48.2%) and east (24.2%) – directions that are oblique to the north-facing beach, resulting in weak, sectiony waves. However, the wind enters its springtime sweet spot: ideal offshore conditions from the south occur 31% of the time, the highest of any month. This often happens on mornings when a thermal low over the land draws in a southerly sea breeze that actually improves the wave shape rather than ruining it. The swell is small – mostly 0.5-1.5m – but with a clean, glassy surface, even waist-high sets become rippable and fun. It’s not for charging, but for groveling on a log or a fish, May offers the most consistent rideable windows of the year.

Average Spot conditions at Middles in May

Swell history for May

0 - 0.5
0.5 - 1
1 - 1.5
1.5 - 2.0
2.0 - 2.5
> 2.5 m

Wind history for May

0 - 10
10 - 20
20 - 30
30 - 40
40 - 50
> 50 km/h

Swell quality

Analyze the groundswell consistency at Middles during May. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Middles for your next trip in May.

Ground swell

Ground swell by size

Wind conditions

Evaluate the wind and swell alignment at Middles for May. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Middles.

Swell with good wind

Swell with good wind by size