Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Costellos surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 6 pm Friday 19 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
6.8° C
(Which is normal for this time of year)How big are the waves at Costellos today?
The current surf forecast for Costellos at 12AM is: 2.1m 10s primary swell from a Southeast direction (forecast issued at 06:00pm December 19). 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 (20 Dec) | - | - |
| Afternoon (20 Dec) | 11ft (3.5m) | 9s |
| Evening (20 Dec) | 8ft (2.5m) | 10s |
Table - waves today at Costellos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| 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 | 10 AM | 1 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2085 | 1339 | 1092 | 716 | 573 | 369 | 453 | 293 | 344 | 254 | 173 | 141 | 113 | 166 | 141 | 192 | 184 | 160 | 106 | 90 | 65 | 55 | 36 | 35 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 10:57PM 2.90 | 10:59AM 3.31 | 11:38PM 2.92 | 11:39AM 3.31 | 12:18AM 2.93 | 12:19PM 3.29 | ||||||||||||||||||
Low Tide / height (m) | 4:47PM 0.50 | 4:48AM 0.87 | 5:27PM 0.47 | 5:28AM 0.85 | 6:07PM 0.47 | 6:09AM 0.85 | ||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:11 | - |
| Sunset | 4:09 | - | - | - | - | - | - | - | 4:09 | - | - | - | - | - | - | - | 4:10 | - | - | - | - | - | - | - |
 |  | |  | | |  |  | |  | | | | | | | | | | | | | | | |
Rain (mm) | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 7 | 5 | 0 | -1 | -2 | -4 | -2 | 1 | 2 | 1 | 1 | 2 | 4 | 3 | 5 | 4 | 1 | -1 | -2 | -4 | -6 | -7 | -6 | -3 |
| Feels °C (?) | -1 | -2 | -10 | -12 | -13 | -12 | -9 | -7 | -3 | -6 | -7 | -6 | -4 | -4 | -2 | -5 | -7 | -9 | -10 | -14 | -15 | -16 | -15 | -12 |
- 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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