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Brant Rock surfForecast / Massachusetts / USA

information circle12 Day Weather and Surf, issued 1 pm Sunday 17 Aug 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Brant Rock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Brant Rock sea temperature is
20.0° C
 (Which is slightly cooler than normal)

Best Forecast Surf Conditions for Brant Rock this week:

The surf forecast for Brant Rock over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 19) at 11PM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.5m and 7s. Another secondary swell of 0.3m and 2s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Brant Rock in the next 12 days are 1.2m 18s and forecast to arrive on Thursday (Aug 21) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 6s period and expected on Sunday (Aug 24) at 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11PM (Tue 19th Aug)1.5ft (0.4m) 15s
Best Surf 5AM (Fri 22nd Aug)2.5ft (0.8m) 14s
Most Powerful 8PM (Thu 21st Aug)4ft (1.2m) 18s

Table - best surf conditions forecast for Brant Rock over the next 12 days.

Hourly12 Days
Massachusetts Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Light rain (total 3mm), mostly falling on Sun night. Warm (max 30°C on Sun afternoon, min 15°C on Mon morning). Winds decreasing (fresh winds from the NE on Sun night, calm by Tue night).

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sat morning. Warm (max 25°C on Fri afternoon, min 17°C on Thu night). Winds increasing (light winds from the W on Fri morning, fresh winds from the SSW by Sat morning).

Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
1
0
0
1
0
0
2
3
1
1
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.3
E
1.1
NE
1.9
NE
1.6
NE
0.9
ENE
0.8
ENE
0.6
ENE
0.4
ESE
0.5
E
0.6
E
0.8
ESE
0.9
ESE
1.1
E
1
E
1.5
ENE
1.3
ENE
1
E
0.7
ENE
0.5
ENE
0.4
ENE
0.3
ENE
Period(s) (?)657777915141717181816912111091010
Wave
Graph
(?)Metric surfscale
Energy (?)1278345251133101128108127232390577104679254049422999513820
Wind
(km/h)
30
SSW
35
NE
30
NE
15
ENE
5
E
10
ENE
15
ESE
10
S
10
SE
20
ESE
10
ESE
20
ENE
20
NE
15
NW
5
W
20
S
30
SSW
30
SSW
35
SSW
25
SSW
10
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		ononcross-
on		cross-
on		cross-
on		cross-
on		cross-
off		crosscross-
on		crossononcrosscross-
off		cross-
off		offoffoffoffoff
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
9:58PM
3.15
10:39AM
2.69
10:54PM
3.17
11:31AM
2.76
11:44PM
3.16
12:16PM
2.81
12:30AM
3.11
12:58PM
2.84
Low Tide
/ height (m)
1:15AM
0.03
1:28PM
0.32
2:21AM
0.04
2:32PM
0.32
3:25AM
0.01
3:34PM
0.28
4:23AM
-0.02
4:32PM
0.22
5:16AM
-0.05
5:24PM
0.17
6:02AM
-0.05
6:12PM
0.14
6:44AM
-0.01
Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunrise--5:52--5:52--5:54--5:56--5:56--5:58--5:58
Sunset7:39--7:38--7:37--7:36--7:34--7:32--7:30--
part cloudthunderstorm part cloudclearclearpart cloudclearpart cloudcloudclearclearclearclearclearclearclearrain showersthunderstorm mod rainrain showerspart cloud
Rain (mm)
-3--------------1262-
Temp. °C302416151718191918201919191823252123222225
Feels °C (?)29259101415151617171615151522241821202027
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Massachusetts

  1. weather stationWind Update The wind is still cross-off at Brant Rock (light winds from the WSW at Marshfield Airport 2 km from Brant Rock). 0.2m 6s windswell from the E to make surfable waves.

    1 hour 40 minutes ago Brant Rock
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1 h 40 min ago

19 km/h
WSW
Cross-Off
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Brant Rock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Brant Rock at:
surf-forecast.com

Information about the Brant Rock Surf forecast

The above surf forecast table for Brant Rock provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Brant Rock can be found by selecting the local surf guide option on the grey menu. Our Brant Rock surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Brant Rock) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Brant Rock may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Brant Rock is 5 km (3 miles) from Marshfield. If you plan a vacation in Massachusetts, look for hotels and other accommodation in Marshfield. Marshfield has rooms for a wide range of budgets as well as car hire and transport links.

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