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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 7 am Sunday 17 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
9.0° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 12PM is: 0.8m 8s primary swell from a South-southeast direction and 0.3m 8s secondary swell from a East direction (forecast issued at 07:00am May 17). An open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 May) | 3ft (0.9m) | 6s |
| Afternoon (17 May) | 2.5ft (0.7m) | 8s |
| Evening (17 May) | 2ft (0.6m) | 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 34°C on Tue afternoon, min 13°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||||||
Sunday 17 | Monday 18 | Tuesday 19 | Wed 20 | |||||||||||||||||||||
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 | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 8 | SSE 6 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 4 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SSE 6 | S 7 | SSE 7 | |
70 | 64 | 117 | 67 | 53 | 51 | 40 | 42 | 41 | 29 | 28 | 28 | 20 | 20 | 20 | 21 | 15 | 28 | 27 | 26 | 26 | 194 | 236 | 121 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | off | off | cross-off | off | cross | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | |
High Tide | 12:10PM3.43m | 00:23AM3.92m | 1:04PM3.44m | 1:16AM3.90m | 1:59PM3.41m | |||||||||||||||||||
Low Tide | 5:58AM-0.07m | 6:08PM0.32m | 6:51AM-0.12m | 7:02PM0.33m | 7:45AM-0.10m | 7:57PM0.38m | ||||||||||||||||||
 |  | |  | | | | |  | |  | | | |  | | | | | | | | | | |
 | 5:18 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | 5:15 |
 | — | — | — | — | — | 8:00 | — | — | — | — | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:02 | — | 8:04 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 16 | 18 | 25 | 27 | 27 | 25 | 20 | 16 | 14 | 13 | 14 | 15 | 15 | 16 | 18 | 18 | 19 | 21 | 29 | 33 | 34 | 29 | 25 | 25 |
14 | 16 | 21 | 24 | 24 | 23 | 18 | 14 | 11 | 9 | 10 | 10 | 11 | 13 | 17 | 18 | 19 | 22 | 28 | 30 | 32 | 28 | 24 | 25 | |
Swell 1 Height (m) Direction Period (s) | SSE 6 | SSE 6 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 4 | SSE 4 | SE 9 | SE 9 | SSE 5 | SSE 6 | SSE 7 | SSE 7 |
 kJ | 58 | 64 | 117 | 67 | 53 | 51 | 40 | 42 | 41 | 29 | 28 | 28 | 20 | 20 | 20 | 9 | 15 | 11 | 27 | 26 | 24 | 97 | 176 | 121 |
Swell 2 Height (m) Direction Period (s) | SE 8 | ESE 8 | E 8 | E 8 | E 8 | — | E 15 | E 15 | E 15 | E 15 | NE 4 | ENE 4 | — | — | E 13 | SE 9 | SE 8 | SE 9 | E 13 | E 13 | SE 9 | E 16 | E 16 | E 16 |
| kJ | 70 | 40 | 12 | 12 | 6 | — | 4 | 4 | 4 | 4 | 2 | 1 | — | — | 3 | 14 | 10 | 28 | 3 | 3 | 26 | 5 | 5 | 5 |
Swell 3 Height (m) Direction Period (s) | — | SSE 8 | — | W 3 | — | — | E 15 | — | — | — | E 15 | E 14 | E 14 | E 13 | E 17 | E 13 | SE 9 | E 13 | — | E 16 | E 13 | — | — | — |
| kJ | — | 24 | — | 1 | — | — | 4 | — | — | — | 4 | 4 | 4 | 4 | 6 | 4 | 14 | 3 | — | 5 | 3 | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | W 3 | WSW 3 | — | — | — | — | NE 3 | NE 3 | NE 3 | ESE 3 | SE 3 | SE 3 | SSE 4 | SSE 4 | SSE 4 | — | WSW 3 | S 4 | S 4 | SW 3 | SSE 6 | S 7 | WSW 4 |
| kJ | 2 | 3 | 2 | — | — | — | — | 1 | 2 | 2 | 1 | 2 | 3 | 9 | 20 | 21 | — | 1 | 14 | 13 | 2 | 194 | 236 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 5 | 0 | 38 | 162 | 167 | 333 | 493 | 493 | 493 | 493 | 14 | 38 | 38 | 38 | 391 | 1293 | 0 | 0 | 172 | 384 |
Best forecast wave conditions in New Hampshire | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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