Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Seabrook Beach surfForecast / New Hampshire / USA
48hr Weather and Surf, issued 12 am Wednesday 17 Dec 2025 ESTForecast update in hr min s Forecast update imminent
Seabrook Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Seabrook Beach sea temperature is
7.2° C
(Which is normal for this time of year)How big are the waves at Seabrook Beach today?
The current surf forecast for Seabrook Beach at 3AM is: 0.4m 10s primary swell from a Southeast direction (forecast issued at 12:00am December 17). An open ocean swell of 1.2m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 1ft (0.3m) | 9s |
| Afternoon (17 Dec) | 3.5ft (1.1m) | 7s |
| Evening (17 Dec) | 1ft (0.3m) | 10s |
Table - waves today at Seabrook Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 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 | 9 | 10 | 6 | 7 | 6 | 10 | 10 | 10 | 10 | 10 | 9 | 10 | 5 | 6 | 6 | 7 | 7 | 8 | 9 | 9 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 28 | 25 | 15 | 14 | 14 | 0 | 104 | 43 | 15 | 15 | 15 | 15 | 14 | 22 | 28 | 64 | 114 | 213 | 352 | 520 | 1137 | 3106 | 2018 | 1260 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | 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 | cross | cross | cross | cross | cross | cross | cross | cross | off | off |
High Tide / height (m) | 9:15PM 2.26 | 9:20AM 2.59 | 9:59PM 2.28 | 10:00AM 2.62 | 10:41PM 2.29 | 10:39AM 2.64 | ||||||||||||||||||
Low Tide / height (m) | 3:24AM 0.42 | 4:07PM 0.12 | 4:05AM 0.42 | 4:47PM 0.09 | 4:44AM 0.41 | 5:26PM 0.06 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:09 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:09 | - | - | - | - | - | - | - | 4:09 | - | - | - | - | - | - | - | 4:09 | - |
 |  |  | |  | | | | | | | |  | | | | | | | |  |  | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 7 | 6 | 2 |
| Temp. °C | -3 | -3 | -3 | 0 | 2 | 5 | 6 | 6 | 4 | 1 | 1 | 2 | 1 | 4 | 5 | 4 | 6 | 7 | 10 | 12 | 13 | 14 | 12 | 6 |
| Feels °C (?) | -10 | -10 | -11 | -9 | -7 | -3 | -1 | -1 | -5 | -5 | -4 | -2 | -4 | -2 | 0 | 0 | 3 | 4 | 5 | 7 | 5 | 6 | 8 | -1 |
- 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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