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Brant Rock Surf Forecast
/ Massachusetts (29 breaks) / Massachusetts (28 breaks) /
Brant Rock surfForecast / Massachusetts / USA
48hr Weather and Surf, issued 7 pm Sunday 17 Aug 2025 EDT
How big are the waves at Brant Rock today?
The current surf forecast for Brant Rock at 9PM is: 0.2m 6s primary swell from a East direction and 0.1m 10s secondary swell from a East direction (forecast issued at 07:00pm August 17). An open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Aug) | - | - |
| Afternoon (17 Aug) | 1ft (0.3m) | 6s |
| Evening (17 Aug) | 0.5ft (0.2m) | 6s |
Table - waves today at Brant Rock. (Swell directed towards the surf break)
Sunday 17 | Monday 18 | Tuesday 19 | Wednesday 20 | |||||||||||||||||||||
| 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 13 | 4 | 5 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 7 | 7 | 17 | 9 | 16 | 15 | 15 | 15 | 14 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 12 | 8 | 31 | 121 | 241 | 361 | 391 | 344 | 250 | 194 | 167 | 124 | 79 | 105 | 90 | 105 | 125 | 134 | 96 | 87 | 129 | 119 | 157 | 153 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | on | on | on | on | on | on | on | cross- on | cross- on | cross- on | on | on | on | cross- on | cross- on | cross | cross- off | cross- off | glass | cross | cross | cross- on |
High Tide / height (m) | 6:47PM 3.11 | 7:31AM 2.58 | 7:52PM 3.10 | 8:38AM 2.57 | 8:57PM 3.12 | 9:42AM 2.62 | ||||||||||||||||||
Low Tide / height (m) | 1:15AM 0.03 | 1:28PM 0.32 | 2:21AM 0.04 | 2:32PM 0.32 | 3:25AM 0.01 | |||||||||||||||||||
Sunday 17 | Monday 18 | Tuesday 19 | Wednesday 20 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 5:52 | - | - | - | - | - | - | - | 5:52 | - | - | - | - | - | - | - | 5:54 | - | - |
| Sunset | 7:39 | - | - | - | - | - | - | - | 7:38 | - | - | - | - | - | - | - | 7:37 | - | - | - | - | - | - | - |
 |  |  |  | |  | | | | |  | | | | | | | | |  | | | | | |
Rain (mm) | - | 1 | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 28 | 24 | 20 | 18 | 17 | 16 | 16 | 15 | 16 | 17 | 17 | 18 | 18 | 17 | 18 | 18 | 19 | 18 | 17 | 17 | 17 | 17 | 19 | 20 |
| Feels °C (?) | 27 | 24 | 17 | 13 | 11 | 9 | 10 | 10 | 12 | 14 | 13 | 15 | 15 | 14 | 15 | 15 | 16 | 15 | 14 | 15 | 17 | 17 | 17 | 17 |
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Massachusetts
The wind is still offshore at Brant Rock (light winds from the SW at Marshfield Airport 2 km from Brant Rock). 0.2m 6s windswell from the E to make surfable waves.
1 h 27 min ago
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