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Costellos Surf Forecast
/ New Hampshire (9 breaks) / New Hampshire (9 breaks) /
Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 1 am Monday 18 May 2026 EDTForecast update in hr min s Forecast update imminent
Costellos surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Costellos sea temperature is
9.2° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 5AM is: 0.6m 8s primary swell from a South-southeast direction and 0.1m 15s secondary swell from a East direction, 0.3m 3s secondary swell from a East-northeast direction (forecast issued at 01:00am May 18). The wind direction is predicted to be cross-onshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 1.5ft (0.5m) | 8s |
| Afternoon (18 May) | 2.5ft (0.7m) | 8s |
| Evening (18 May) | 1.5ft (0.4m) | 8s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 33°C on Tue afternoon, min 11°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | ||||||||||||||||||||||
2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
SE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 4 | SSE 5 | SE 9 | SE 9 | SE 9 | SE 9 | SSE 6 | S 7 | SSE 7 | SE 8 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | |
31 | 41 | 29 | 28 | 59 | 20 | 20 | 20 | 22 | 19 | 28 | 28 | 27 | 26 | 119 | 236 | 102 | 21 | 23 | 27 | 29 | 29 | 29 | 29 | |
Wind (km/h) | ||||||||||||||||||||||||
on | cross-on | on | on | cross-on | cross-on | cross-on | glassy | glassy | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | |
High Tide | 00:23AM3.92m | 1:04PM3.44m | 1:16AM3.90m | 1:59PM3.41m | 2:12AM3.82m | 2:56PM3.35m | ||||||||||||||||||
Low Tide | 6:51AM-0.12m | 7:02PM0.33m | 7:45AM-0.10m | 7:57PM0.38m | 8:41AM-0.01m | 8:56PM0.47m | ||||||||||||||||||
 |  |  |  |  | | | | | | | | | | | | | | | | | | | | |
 | — | 5:16 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:02 | — | — | — | — | — | — | — | 8:04 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 17 | 15 | 14 | 14 | 13 | 13 | 17 | 18 | 20 | 23 | 31 | 33 | 33 | 25 | 23 | 22 | 22 | 25 | 30 | 29 | 27 | 24 | 18 |
18 | 15 | 12 | 9 | 10 | 9 | 11 | 18 | 19 | 21 | 23 | 30 | 30 | 31 | 24 | 23 | 21 | 22 | 25 | 28 | 26 | 24 | 21 | 14 | |
Swell 1 Height (m) Direction Period (s) | SE 8 | SSE 8 | SE 8 | SE 8 | E 14 | SE 8 | SE 8 | SE 4 | SE 4 | SSE 5 | SSE 5 | SSE 4 | SE 9 | SSE 5 | SSE 6 | SSE 7 | SSE 7 | S 5 | S 5 | S 5 | S 5 | SE 9 | SE 9 | SE 9 |
 kJ | 31 | 41 | 29 | 28 | 4 | 20 | 20 | 14 | 21 | 19 | 14 | 8 | 27 | 18 | 100 | 145 | 102 | 20 | 18 | 12 | 13 | 29 | 29 | 29 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | E 15 | E 15 | E 15 | E 18 | ENE 4 | ENE 4 | SE 8 | SE 8 | SE 8 | SE 9 | SE 9 | E 13 | SE 9 | E 16 | E 16 | E 16 | SE 8 | SE 8 | SE 9 | SE 9 | SSE 5 | SSE 6 | SSE 6 |
| kJ | 5 | 4 | 4 | 4 | 6 | 1 | 1 | 20 | 9 | 10 | 28 | 28 | 3 | 26 | 5 | 5 | 5 | 21 | 23 | 27 | 29 | 5 | 7 | 6 |
Swell 3 Height (m) Direction Period (s) | E 15 | E 15 | — | — | E 18 | E 14 | E 13 | ENE 4 | SE 9 | SE 9 | E 13 | E 13 | E 16 | E 13 | — | — | E 16 | E 16 | E 16 | E 16 | E 12 | E 12 | SW 4 | E 14 |
| kJ | 4 | 4 | — | — | 6 | 4 | 4 | 1 | 14 | 14 | 3 | 3 | 5 | 3 | — | — | 5 | 5 | 5 | 5 | 3 | 3 | 1 | 4 |
Wind waves Height (m) Direction Period (s) | NE 3 | ENE 3 | E 3 | E 4 | SE 8 | SE 4 | SE 4 | SSE 4 | SSE 4 | WSW 3 | S 5 | SW 2 | S 4 | WSW 3 | SSE 6 | S 7 | WSW 3 | WSW 4 | WSW 4 | WSW 3 | WSW 3 | W 3 | W 3 | WNW 3 |
| kJ | 1 | 2 | 2 | 4 | 59 | 6 | 10 | 16 | 22 | 1 | 22 | 1 | 12 | 1 | 119 | 236 | 4 | 9 | 7 | 4 | 3 | 8 | 4 | 4 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 162 | 167 | 167 | 493 | 186 | 493 | 493 | 0 | 0 | 386 | 0 | 391 | 391 | 38 | 525 | 172 | 384 | 14 | 203 | 588 | 38 | 38 | 162 | 38 |
Best forecast wave conditions in New Hampshire | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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