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Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 12 am Monday 08 Dec 2025 ESTForecast 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
8.0° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 6AM is: 0.7m 8s primary swell from a East-southeast direction and 0.1m 4s secondary swell from a Southwest direction (forecast issued at 12:00am December 08). An open ocean swell of 0.9m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (08 Dec) | 1.5ft (0.5m) | 8s |
| Afternoon (08 Dec) | 1.5ft (0.4m) | 8s |
| Evening (08 Dec) | 1.5ft (0.4m) | 8s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 08 | Tuesday 09 | Wednesday 10 | ||||||||||||||||||||||
| 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 14 | 14 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 102 | 86 | 59 | 45 | 38 | 26 | 21 | 22 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 6 | 6 | 6 | 6 | 4 | 4 | 157 | 331 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- off |
High Tide / height (m) | 1:11AM 3.40 | 1:23PM 3.73 | 2:06AM 3.32 | 2:19PM 3.54 | 3:02AM 3.23 | 3:17PM 3.32 | ||||||||||||||||||
Low Tide / height (m) | 7:10AM 0.41 | 7:51PM 0.06 | 8:07AM 0.52 | 8:45PM 0.24 | 9:06AM 0.64 | |||||||||||||||||||
Monday 08 | Tuesday 09 | Wednesday 10 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:07 | - | - | - | - | - | - | - | 4:07 | - | - | - | - | - | - | - | 4:07 | - |
 |  | | |  | |  | | | | | | | |  |  | |  | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| Temp. °C | 2 | 0 | -5 | -7 | -7 | -6 | -7 | -8 | -9 | -10 | -10 | -10 | -8 | -4 | -2 | -2 | -1 | -1 | -1 | 0 | 1 | 3 | 5 | 7 |
| Feels °C (?) | -5 | -8 | -13 | -15 | -16 | -14 | -14 | -15 | -16 | -16 | -16 | -15 | -14 | -10 | -8 | -10 | -8 | -6 | -6 | -6 | -5 | -3 | 0 | 0 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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