New Hampshire
Here's how the next 5 days are shaping up at Costellos, New Hampshire. Each day is rated based on breaking wave height, swell period, and wind — updated hourly from the latest NOAA GFS run.
Sat, May 16: 5–6ft, 10s period, rated Fair. Steady 5-6ft waves on offer on ESE swell at 10s — barely a breath of wind. Afternoon breeze fills in to 11mph.
Sun, May 17: 1–2ft, 9s period, rated Poor. Dawn patrol is the move — 2-3ft on SSE swell at 6s with moderate SW wind around 7mph. Wind fills in through the day, pushing up to 15mph from the W and dropping conditions to poor.
Mon, May 18: 0–1ft, 8s period, rated Very Poor. Not the most exciting day — 1-2ft and poor conditions with light winds out of the ESE. Expect the wind to bump up to around 13mph by PM.
Tue, May 19: 0–1ft, 9s period, rated Very Poor. A slow one — 1-2ft waves and very poor conditions with moderate SW wind around 8mph.
Wed, May 20: 0–1ft, 9s period, rated Very Poor. Not the most exciting day — 0-1ft and very poor conditions with moderate WSW wind around 10mph. Expect the wind to bump up to around 16mph by PM.
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Costellos is a sheltered beach break on New Hampshire's Atlantic coast that catches swell wrapping around the rocky headlands of the region. The northwest-facing exposure means this spot works best with northeast swell and southwestern offshore winds, offering mellow, rolling waves ideal for learning and progression. This quiet New England beach break provides a peaceful alternative to more crowded New England surf zones, with consistent small to medium waves during fall and winter swells.
Wave heights shown are breaking wave heights — the actual rideable wave size at this spot.
The current wave height at Costellos is 5-6ft with a 10.1s swell period. Wind is WSW at 8mph and conditions are rated Fair. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Costellos is 5-6ft, produced by a 3.9ft ESE primary swell at 10s. Breaking wave height is the actual rideable wave size at the shore — calculated from offshore swell data using this spot's coastal bathymetry — not the raw buoy reading.
Based on the current 5-day forecast, the best window to surf Costellos is Saturday from 9 AM to 12 PM with 6ft waves, a 10.1s swell period, and conditions rated Fair. Check the hourly forecast for updates as conditions can shift.
Costellos works best with a NE swell and NW winds. Offshore winds groom the face of the wave, while onshore winds turn it sloppy. Cross-offshore conditions usually produce the cleanest shape.
Tide plays a big role at Costellos. Mid tide works for most beach breaks, while reef and point breaks often prefer higher or lower stages. Use the tide chart above to line up your session with the swell peak.
Costellos is a beach with a sand bottom, suited to beginner surfers. Costellos is a sheltered beach break on New Hampshire's Atlantic coast that catches swell wrapping around the rocky headlands of the region. The northwest-facing exposure means this spot works best with northeast swell and southwestern offshore winds, offering mellow, rolling waves ideal for learning and progression. This quiet New England beach break provides a peaceful alternative to more crowded New England surf zones, with consistent small to medium waves during fall and winter swells.
The prime season at Costellos is fall, when swell direction, wind patterns, and water temps line up most consistently. Outside the peak season you can still score, but you'll need to watch the forecast closely for the right windows.
Common hazards at Costellos include rocky outcrops, cold water temperatures, seasonal rip currents. Always check conditions before paddling out, respect local etiquette, and never surf alone if you're unfamiliar with the break.
Our Costellos forecast uses NOAA GFS and other weather models combined with spot-specific bathymetry to calculate breaking wave heights. Short-range (1-3 day) forecasts are most reliable. Extended forecasts show general trends. See the forecast accuracy card above for per-spot and regional performance metrics.
