Manasquan Inlet - surf spot statistics

Best Surf Season (November - February)

The heart of winter delivers the most consistent swell energy to Manasquan Inlet. With average wave heights holding steady at 1.3m and periods ranging from 6.9 to 7.2 seconds, the combination of powerful extratropical lows spinning up the North Atlantic and a climatological uptick in west to northwest wind events creates frequent windows of clean, punchy surf. The jet stream digs deep, steering storms along a favorable track that pumps in long-period groundswell from the WNW through SW quadrants. When the wind clocks around to offshore from the W or NW, the lines stack up beautifully at the inlet – offering rippable, sometimes heavy waves in the 1-1.5m range. Offshore wind percentages hover around 31-32%, meaning patience and a keen eye on the forecast are required, but the payoff is well worth it.

Fair Surf Season (March, April, September, October)

Spring and early fall act as transitional periods where the surf is still very much alive, but consistency takes a hit. March sees the tail end of winter storm activity, with average swell heights of 1.3m and a slight bump in period to 7.5s, yet ideal wind percentages drop to 27% as the atmosphere becomes more volatile. April brings a dip in swell height to 1.2m and a shift toward more easterly and southerly swell directions due to weakening lows and the onset of springtime high-pressure systems. September and October benefit from the early-season ramp-up of Atlantic storm activity, with the average period climbing to 7.7-8.3s – a signal that tropical systems and early Nor’easters are injecting longer-period energy into the water. However, the wind is fickle, blowing onshore from the east a fair bit. Still, when the right combination emerges – a hurricane swell from the ESE meeting a light NW breeze – the inlet can absolutely light up with glassy, plus-size waves.

Low Surf Season (May - August)

The summer doldrums settle over the Jersey Shore from May through August. Average wave heights tumble to 0.8-1.0m, and the predominant swell direction shifts to the SSE and S (30-50% of all swell) – a poor angle for the east-facing inlet. Most of the energy comes from weak, distant trades or local sea breeze pulses, resulting in short-period (6.9-7.5s), often bumpy and inconsistent conditions. The good news is that ideal wind percentages skyrocket to 44-49% as the thermal gradient favors light westerlies and northwesterlies in the afternoon. So while you’ll have plenty of clean, glassy mornings, the waves are typically small (0.5-1m) and grovelly. Dedicated longboarders and funboard riders can find fun little peaks, but the inlet rarely sees anything over 1.5m during these months unless a stray tropical system drifts close enough to kick up a pulse of easterly swell.

August: Subtle Swell Increase

August shows a slight uptick in swell activity compared to July. The average wave height rises to 0.9m, and the period increases to 7.5s – the first sign of longer-period energy returning. The dominant swell directions are still from the SSE (25.7%) and SE (23.2%), but there’s also a notable increase in east swell (E 9.4%) and ENE (3.8%). These more direct easts can produce cleaner, more organized lines. Ideal wind percentages remain high at 47%, with the most frequent directions being SSW (13.7%) and SW (12.0%). True offshore winds from the WNW, NW, and W are less common but still occur. The key change in August is the growing presence of tropical systems. Hurricanes and tropical storms in the Atlantic frequently steer swell toward the Jersey coast, often arriving as long-period E or ESE groundswell. When these pulses align with light offshore flow from the north, the inlet can turn on and deliver chest-to-head-high waves with clean, lined-up walls. This is the best month of the summer for a chance at quality surf.