- Forecast
- Maps
- Live
- Weather State
- Spot Information
Costellos Surf Forecast
/ New Hampshire (9 breaks) / New Hampshire (9 breaks) /
Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 1 pm 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 7PM is: 0.4m 8s primary swell from a Southeast direction and 0.6m 4s secondary swell from a Southeast direction (forecast issued at 01:00pm May 18). The wind direction is predicted to be onshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 1.5ft (0.5m) | 8s |
| Afternoon (18 May) | 1.5ft (0.5m) | 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 ForecastSome drizzle, heaviest during Tue night. Warm (max 33°C on Tue afternoon, min 10°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 | 5 AM | 8 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 8 | SE 8 | SE 8 | SE 8 | SSE 5 | SSE 5 | S 5 | SE 9 | SE 9 | SE 8 | SSE 6 | SSE 7 | S 7 | S 7 | SSE 7 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | |
28 | 28 | 20 | 20 | 37 | 29 | 29 | 28 | 27 | 35 | 36 | 107 | 225 | 163 | 54 | 23 | 27 | 29 | 41 | 30 | 29 | 29 | 21 | 13 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | on | glassy | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 1:04PM3.44m | 1:16AM3.90m | 1:59PM3.41m | 2:12AM3.82m | 2:56PM3.35m | 3:10AM3.67m | ||||||||||||||||||
Low Tide | 7:02PM0.33m | 7:45AM-0.10m | 7:57PM0.38m | 8:41AM-0.01m | 8:56PM0.47m | |||||||||||||||||||
 |  | | |  | | | |  | | | |  | | | | | | | | | |  | | |
 | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:13 | — |
 | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:02 | — | — | — | — | — | — | — | 8:04 | — | — | — | 8:05 |
— | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 17 | 15 | 15 | 19 | 20 | 21 | 23 | 30 | 33 | 31 | 28 | 24 | 23 | 22 | 25 | 29 | 30 | 27 | 23 | 18 | 14 | 11 | 10 |
12 | 13 | 11 | 14 | 19 | 20 | 21 | 23 | 28 | 30 | 29 | 28 | 24 | 23 | 22 | 24 | 27 | 26 | 24 | 20 | 14 | 10 | 5 | 6 | |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SSE 5 | SSE 5 | SSE 5 | S 5 | SE 9 | SE 8 | SSE 6 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | SE 8 | S 5 | S 5 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 |
 kJ | 28 | 28 | 20 | 20 | 27 | 25 | 18 | 23 | 27 | 35 | 36 | 107 | 158 | 102 | 54 | 23 | 11 | 8 | 41 | 30 | 29 | 29 | 21 | 13 |
Swell 2 Height (m) Direction Period (s) | E 15 | ENE 3 | — | — | SE 8 | SE 8 | SE 8 | SE 9 | E 13 | E 13 | SE 8 | E 16 | E 16 | E 16 | SE 9 | E 16 | SE 9 | SE 9 | E 12 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 5 |
| kJ | 4 | 1 | — | — | 20 | 9 | 10 | 28 | 3 | 3 | 24 | 5 | 5 | 5 | 22 | 5 | 27 | 29 | 3 | 6 | 6 | 6 | 6 | 3 |
Swell 3 Height (m) Direction Period (s) | — | E 14 | E 14 | E 13 | E 13 | SE 9 | SE 9 | E 13 | E 16 | E 16 | E 13 | — | — | — | E 16 | E 16 | E 16 | E 15 | E 15 | E 14 | E 14 | E 15 | E 15 | E 15 |
| kJ | — | 4 | 4 | 4 | 3 | 14 | 14 | 3 | 5 | 5 | 3 | — | — | — | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | E 3 | SE 2 | SE 3 | SE 4 | SSE 5 | S 5 | S 5 | S 5 | S 5 | S 5 | WSW 3 | — | S 7 | S 7 | SW 3 | SSW 5 | WSW 3 | W 3 | W 3 | WNW 3 | NW 3 | NW 3 | NW 3 | NNE 4 |
| kJ | 2 | 1 | 5 | 18 | 37 | 29 | 29 | 31 | 25 | 27 | 2 | — | 225 | 163 | 2 | 27 | 2 | 4 | 5 | 3 | 2 | 2 | 2 | 6 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 186 | 493 | 493 | 198 | 0 | 0 | 0 | 0 | 386 | 0 | 0 | 0 | 0 | 0 | 0 | 391 | 391 | 198 | 38 | 171 | 186 | 199 | 168 | 186 |
Best forecast wave conditions in New Hampshire | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Costellos surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Nearest