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Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 12 am Friday 12 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 8AM is: 0.2m 10s primary swell from a South-southeast direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 12:00am December 12). An open ocean swell of 1.2m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | 0.5ft (0.2m) | 10s |
| Afternoon (12 Dec) | 0.5ft (0.1m) | 10s |
| Evening (12 Dec) | 0.5ft (0.1m) | 10s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 12 | Saturday 13 | Sunday 14 | ||||||||||||||||||||||
| 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) (?) | 10 | 10 | 10 | 10 | 10 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 5 | 5 | 4 | 5 | 8 | 8 | 8 | 4 | 4 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 48 | 25 | 16 | 15 | 9 | 8 | 4 | 2 | 2 | 4 | 4 | 4 | 4 | 3 | 3 | 21 | 11 | 10 | 4 | 7 | 7 | 7 | 8 | 18 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 4:55AM 3.08 | 5:16PM 2.95 | 5:50AM 3.04 | 6:16PM 2.83 | 6:41AM 3.03 | |||||||||||||||||||
Low Tide / height (m) | 10:35PM 0.61 | 11:08AM 0.82 | 11:30PM 0.76 | 12:08PM 0.84 | 12:22AM 0.88 | 1:03PM 0.82 | ||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 7:03 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:05 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:07 | - | - | - | - | - | - | - | 4:07 | - | - | - | - | - | - | - | 4:07 | - |
 | | | |  | | | | | | |  |  | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | -6 | -7 | -7 | -7 | -4 | -1 | 0 | -1 | -3 | -3 | -3 | -3 | -1 | 1 | 2 | 1 | 1 | -1 | -2 | -3 | -3 | -1 | -3 | -5 |
| Feels °C (?) | -16 | -16 | -17 | -16 | -14 | -10 | -9 | -9 | -11 | -10 | -10 | -9 | -7 | -6 | -4 | -5 | -5 | -6 | -8 | -9 | -10 | -8 | -11 | -13 |
- 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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