New Hampshire
A slow one — 1-2ft waves and poor conditions with barely a breath of wind.
A slow one — 1-2ft waves and poor conditions with barely a breath of wind.
Best window·Monday 6AM–9AM·2-3ft·Fair - Good
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.
Thu, Sep 3: 1–2ft, 5s period, rated Poor. The sweet spot is around midday — 1-2ft waves, glassy conditions, poor conditions. Early on is a little rough — give it until mid-morning to shape up.
Fri, Sep 4: 2–3ft, 7s period, rated Fair - Good. First light looks cleanest — 2-3ft on E swell at 6s with calm winds. It gets a bit messier later in the day.
Sat, Sep 5: 1–2ft, 7s period, rated Poor. Get out early for the best of it — 1-2ft waves on E swell at 6s and 12mph from the N. Things get a bit scrappier as the day goes on.
Sun, Sep 6: 2–3ft, 8s period, rated Poor. Get out early for the best of it — 2-3ft waves on NE swell at 6s and 19mph N winds. Things get a bit scrappier as the day goes on.
Mon, Sep 7: 2–3ft, 10s period, rated Fair - Good. Dawn patrol is the move — 2-3ft on ENE swell at 10s with 12mph from the NW. Conditions go downhill through the afternoon.
Two days at a glance. Swipe for later hours.Five days at a glance. Drag for later hours.
Poor today — get one free email when Costellos turns Good.
Check Costellos from the lineup
Forecasts, surf alerts, and live conditions in the Swell Intel iPhone app.
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 4.4s swell period. Wind is E at 2mph. 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 1.9ft ESE wind swell swell at 4s, a 1.4ft ESE secondary swell at 9s. 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 Monday from 6 AM to 9 AM with 3ft waves, a 9.7s 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. We also verify our offshore swell predictions against NOAA buoy measurements daily — see our accuracy page for those swell-verification metrics (buoys measure open-water swell, not breaking surf size).
