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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 pm Tuesday 12 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 slightly warmer than usual)How big are the waves at Costellos today?
The current surf forecast for Costellos at 5PM is: 0.8m 8s primary swell from a East-southeast direction and 0.2m 11s secondary swell from a East-southeast direction, 0.3m 3s secondary swell from a South-southeast direction (forecast issued at 01:00pm May 12). The wind direction is predicted to be glassy.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 May) | 3.5ft (1.0m) | 8s |
| Afternoon (12 May) | 3ft (0.9m) | 8s |
| Evening (12 May) | 2.5ft (0.7m) | 7s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 40mm), heaviest during Thu night. Very mild (max 16°C on Wed afternoon, min 8°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Tue 12 | Wednesday 13 | Thursday 14 | Fri 15 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
ESE 8 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | SE 10 | SE 10 | ESE 7 | ESE 7 | SSE 7 | SSE 5 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | SE 6 | SE 6 | ESE 7 | ESE 7 | ESE 7 | E 7 | SE 9 | |
119 | 91 | 72 | 48 | 40 | 28 | 27 | 27 | 19 | 61 | 149 | 190 | 156 | 87 | 74 | 101 | 133 | 128 | 170 | 165 | 186 | 217 | 139 | 294 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | glassy | glassy | cross-on | glassy | cross | glassy | cross-off | cross | cross | cross | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | |
High Tide | 8:14PM3.07m | 8:39AM2.99m | 9:02PM3.29m | 9:32AM3.12m | 9:51PM3.51m | |||||||||||||||||||
Low Tide | 1:56PM0.79m | 2:30AM0.74m | 2:45PM0.68m | 3:23AM0.50m | 3:35PM0.56m | 4:14AM0.27m | ||||||||||||||||||
 | |  |  | |  | | | |  | | | | | | | | | |  |  |  | | | |
 | — | — | — | — | — | — | 5:22 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — |
 | — | — | 7:54 | — | — | — | — | — | — | — | 7:55 | — | — | — | — | — | — | — | 7:58 | — | — | — | — | 7:59 |
— | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 | 1 | 5 | 9 | 13 | 4 | 2 | 2 | |
Temp °C | 12 | 13 | 14 | 12 | 11 | 10 | 9 | 9 | 10 | 13 | 16 | 15 | 13 | 13 | 12 | 12 | 12 | 11 | 10 | 10 | 10 | 9 | 8 | 8 |
8 | 10 | 11 | 8 | 8 | 7 | 7 | 6 | 6 | 8 | 9 | 9 | 9 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 5 | 4 | 3 | 3 | |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 6 | SE 6 | ESE 7 | ESE 7 | ESE 7 | E 7 | SE 9 |
 kJ | 119 | 91 | 72 | 48 | 40 | 27 | 26 | 27 | 19 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 128 | 120 | 165 | 186 | 217 | 139 | 294 |
Swell 2 Height (m) Direction Period (s) | NNE 4 | NE 4 | ESE 11 | ESE 11 | S 4 | SSE 4 | SSE 4 | SSE 4 | ESE 10 | E 7 | — | — | — | — | — | — | E 13 | ESE 10 | ESE 10 | E 10 | E 11 | — | SE 7 | E 7 |
| kJ | 1 | 1 | 13 | 23 | 8 | 7 | 6 | 4 | 10 | 1 | — | — | — | — | — | — | 3 | 10 | 10 | 2 | 9 | — | 47 | 120 |
Swell 3 Height (m) Direction Period (s) | E 15 | ESE 12 | NE 4 | NE 4 | SE 10 | SE 10 | SE 10 | ESE 10 | E 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 9 | — |
| kJ | 4 | 13 | 1 | 1 | 28 | 28 | 27 | 20 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 62 | — |
Wind waves Height (m) Direction Period (s) | — | — | SSE 3 | S 3 | SSE 4 | — | — | S 4 | SSE 4 | SSE 7 | SSE 5 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | — | SE 6 | — | — | — | — | — |
| kJ | — | — | 1 | 6 | 9 | — | — | 8 | 6 | 61 | 149 | 190 | 156 | 87 | 74 | 101 | 133 | — | 170 | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 493 | 0 | 5 | 0 | 0 | 1189 | 1293 | 1049 | 916 | 443 | 458 | 642 | 198 | 276 | 186 | 321 | 227 | 198 | 98 | 98 | 162 |
Best forecast wave conditions in New Hampshire | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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