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Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 6 am Tuesday 16 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
7.3° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 9AM is: 0.4m 10s primary swell from a Southeast direction (forecast issued at 06:00am December 16). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | 1.5ft (0.4m) | 10s |
| Afternoon (16 Dec) | 1ft (0.3m) | 11s |
| Evening (16 Dec) | 1.5ft (0.4m) | 10s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| 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 | 10 PM | 1 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 10 | 10 | 11 | 11 | 10 | 10 | 10 | 9 | 10 | 7 | 7 | 6 | 10 | 10 | 10 | 10 | 10 | 10 | 4 | 5 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 26 | 26 | 26 | 17 | 18 | 18 | 28 | 25 | 15 | 14 | 14 | 249 | 104 | 43 | 16 | 15 | 15 | 16 | 15 | 24 | 35 | 92 | 140 | 197 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | cross- off | cross | cross | cross- off | cross | cross | cross- off |
High Tide / height (m) | 8:13AM 3.10 | 8:51PM 2.78 | 8:56AM 3.16 | 9:34PM 2.82 | 9:37AM 3.22 | 10:16PM 2.87 | ||||||||||||||||||
Low Tide / height (m) | 1:59AM 0.97 | 2:41PM 0.70 | 2:43AM 0.96 | 3:24PM 0.62 | 3:26AM 0.93 | 4:06PM 0.55 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| Sunrise | - | - | 7:07 | - | - | - | - | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:07 | - | - | - | - | - |
| Sunset | - | - | - | - | 4:08 | - | - | - | - | - | - | - | 4:08 | - | - | - | - | - | - | - | 4:09 | - | - | - |
 |  |  | | |  | | | | | |  |  | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | -5 | -5 | -3 | -1 | -1 | -2 | -3 | -3 | -2 | 0 | 3 | 6 | 5 | 6 | 5 | 1 | 1 | 0 | 1 | 3 | 4 | 4 | 5 | 7 |
| Feels °C (?) | -12 | -11 | -9 | -7 | -7 | -8 | -10 | -11 | -10 | -8 | -5 | -2 | -2 | -1 | -4 | -6 | -5 | -4 | -3 | -3 | -1 | -1 | 1 | 4 |
- 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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