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Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 12 pm Saturday 13 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
7.7° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 6PM is: 0.1m 9s primary swell from a Southeast direction and 0.1m 10s secondary swell from a East direction (forecast issued at 12:00pm December 13). An open ocean swell of 0.8m 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 (13 Dec) | 0.5ft (0.1m) | 10s |
| Afternoon (13 Dec) | 0.5ft (0.1m) | 11s |
| Evening (13 Dec) | 2ft (0.6m) | 5s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 4 AM | 7 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 17 | 11 | 10 | 5 | 5 | 16 | 8 | 8 | 8 | 4 | 5 | 9 | 6 | 6 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 4 | 6 | 3 | 3 | 16 | 3 | 5 | 3 | 7 | 7 | 21 | 61 | 8 | 42 | 27 | 61 | 41 | 37 | 28 | 28 | 37 | 35 | 25 | 26 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- 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 | off | off |
High Tide / height (m) | 6:16PM 2.83 | 6:41AM 3.03 | 7:12PM 2.77 | 7:29AM 3.05 | 8:03PM 2.76 | |||||||||||||||||||
Low Tide / height (m) | 12:08PM 0.84 | 12:22AM 0.88 | 1:03PM 0.82 | 1:12AM 0.95 | 1:54PM 0.77 | 1:59AM 0.97 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - |
| Sunset | - | - | 4:07 | - | - | - | - | - | - | - | 4:07 | - | - | - | - | - | - | - | 4:08 | - | - | - | - | - |
 | | |  | | | | | | | | |  | | | |  |  | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | -1 | 1 | 2 | 1 | 0 | 0 | -1 | -3 | -1 | 0 | -3 | -5 | -8 | -10 | -10 | -9 | -7 | -5 | -5 | -5 | -5 | -5 | -4 | -5 |
| Feels °C (?) | -7 | -6 | -4 | -5 | -6 | -5 | -6 | -8 | -7 | -5 | -10 | -12 | -17 | -19 | -18 | -18 | -16 | -14 | -13 | -12 | -12 | -12 | -10 | -11 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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