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.
Sun, May 10: 1–2ft, 8s period, rated Poor. Slim pickings today — 1-2ft and poor with 11mph SSE winds.
Mon, May 11: 2–3ft, 8s period, rated Poor. Hold off if you can — morning starts out poor with 1-2ft waves. Later in the day looks more promising — 2-3ft and fair.
Tue, May 12: 2–3ft, 8s period, rated Fair. Expect 2-3ft all day on ESE swell at 8s with light NW winds — nothing amazing but surfable.
Wed, May 13: 1–2ft, 7s period, rated Poor. A slow one — 1-2ft waves and poor conditions with light ESE winds. Afternoon breeze fills in to 16mph.
Thu, May 14: 2–3ft, 7s period, rated Poor. Morning kicks off with 2-3ft on ESE swell at 10s.
Free, simple, and takes 30 seconds.
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 1-2ft with a 7.95s swell period. Wind is SSE at 12mph and conditions are rated Poor. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Costellos is 1-2ft, produced by a 2.2ft ESE primary swell at 8s, a 0.3ft ESE secondary swell at 13s, a 1.8ft SE wind swell swell at 4s. 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 Friday from 1 PM to 4 PM with 3ft waves, a 8.8s swell period, and conditions rated Fair - Good. 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.
