Nantasket Beach Surf Break

Lat Long: 42.31° N 70.88° W

Nantasket Beach Surf Forecast and Surf Report

Issued: 7 am 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Nantasket Beach sea temperature is
19.6° C
0.8° 

Nantasket Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Nantasket Beach surf forecast from 20 Aug 2026:

  • Most powerful swell: Saturday 22 Aug, 8PM (local time) - 2.5ft (0.8m), 6s period, ENE swell with 40 kJ wave energy.

Best Forecast Surf Conditions for Nantasket Beach this week:

The most powerful waves expected at Nantasket Beach in the next 16 days are 0.8m 6s and forecast to arrive on Saturday (Aug 22) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Sunday (Aug 23) at 11PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Sat 22nd Aug)2.5ft (0.8m) 6s

Table - best surf conditions forecast for Nantasket Beach over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let's have a good, hard look at what’s on the table for Nantasket Beach over the next couple of weeks.

Right off the bat, I’ve got to be straight with you: the surf outlook is pretty bleak. This stretch is shaping up to be a long, quiet run with hardly anything worth paddling out for. The entire 16-day window is looking at tiny, weak surf with poor conditions hanging around for the vast majority of it.

We start off on Thursday, the 20th of August with some tiny 1ft waves out of the ESE at a short 8 seconds. The water temp is sitting at 67°, which is about average for the time of year, but that’s the only thing that’s normal. The combined swell energy is a measly 12, and with glassy conditions first thing, it’s the kind of flat, mushy day you’d use to practice your pop-ups if you’re desperate.

The weekend is rough. Friday the 21st and Saturday the 22nd serve up a bit more swell, maybe hitting 3ft, but the period drops right off to a whimpy 4 to 6 seconds. The wind is onshore or cross-onshore, making for choppy, messy surf. Combined energy gets up to a weak 61, but it’s all junk.

From Sunday the 23rd right through to the end of the month, it’s the same sad story. Wave heights mostly hover around 0.7ft to 2ft. While we do get some clean, offshore winds from the WSW on Monday the 24th and Tuesday the 25th, the swell is just too tiny and weak to do anything with. The combined energy drops into the single digits and teens. The long-period (11-12 sec) groundswell we see mid-week is utterly wasted on the flat conditions. There is one morning of glass on Monday the 31st of August, but that’s for 1ft slop.

Into the first week of September, the pattern doesn't change. A little bump on the 2nd of September pushes 3ft from the NE, but it’s a short 5-second period with combined energy around 49-50. That’s a weak, windswell with onshore flow in the afternoon. After that, it fades right back to tiny 1ft to 2ft surf with unhelpful onshore winds.

Honestly, there isn’t a single standout day here. No real pick of the bunch. For a spot like Nantasket that needs a decent push of NE groundswell and clean conditions, we’re getting neither. If this was a bit bigger and cleaner, the beach setup would probably be more interesting for the kites than the paddle crew.

Keep the board in the car and check back with me later, but for now, there’s just nothing on the menu worth chasing.

Rusty.

Short Range Forecast

Light rain (total 8mm), mostly falling on Sat afternoon. Warm (max 28°C on Thu afternoon, min 17°C on Sat afternoon). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 18mm), heaviest on Sun morning. Warm (max 25°C on Mon afternoon, min 16°C on Mon night). Wind will be generally light.

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.3
ESE
8
0.3
ESE
7
0.4
ESE
8
0.4
E
8
0.3
E
8
0.4
E
8
0.8
ENE
4
0.8
E
6
0.5
E
5
0.5
ESE
5
0.5
SE
5
0.2
E
12
0.2
E
12
0.2
E
11
0.2
E
11
0.2
E
11
0.2
E
11
0.2
E
11
0.1
E
14
0.1
E
13
0.2
ESE
8
Wave Graph
Metric surfscale
Energy kJ
12
10
19
22
12
20
22
38
12
14
11
11
11
10
9
9
9
9
4
3
6
Wind (km/h)
0
WNW
10
ESE
5
N
20
NE
10
ENE
5
NNE
15
E
15
NE
10
N
5
E
5
E
15
SSW
20
WSW
20
W
15
W
10
W
5
SSW
10
SSW
10
SE
10
E
5
NNE
Wind State
glassy
on
cross
cross-on
on
glassy
on
cross-on
cross-off
on
on
cross-off
off
off
off
off
cross-off
cross-off
cross-on
on
cross
High Tide
5:58PM2.69m
6:41AM2.30m
6:52PM2.64m
7:41AM2.26m
7:49PM2.62m
8:40AM2.27m
8:46PM2.66m
9:34AM2.33m
9:38PM2.73m
10:18AM2.43m
10:23PM2.82m
10:58AM2.54m
11:04PM2.90m
Low Tide
11:40AM0.55m
00:28AM0.41m
12:35PM0.65m
1:27AM0.45m
1:31PM0.69m
2:27AM0.45m
2:28PM0.67m
3:22AM0.40m
3:21PM0.60m
4:08AM0.32m
4:08PM0.50m
4:47AM0.23m
4:49PM0.39m
clear
part cloud
light rain
clear
clear
clear
part cloud
light rain
light rain
mod rain
light rain
mod rain
clear
clear
clear
part cloud
cloud
part cloud
rain showers
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:56
5:56
5:58
5:58
6:00
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:37
7:36
7:34
7:32
7:30
7:29
7:28
 mm
2
4
2
7
1
10
1
1
Temp °C
27
28
25
20
21
20
20
18
18
18
22
22
23
25
22
22
25
21
21
22
21
Feels °C
28
28
24
17
18
19
19
16
17
19
24
24
21
21
18
19
23
18
22
24
23
  • 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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Information about the Nantasket Beach Surf forecast

The above surf forecast table for Nantasket Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nantasket Beach can be found by selecting the local surf guide option on the grey menu. Our Nantasket Beach 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 (Nantasket Beach) 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 Nantasket Beach 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.

Nantasket Beach is 8 km (5 miles) from the city of Hingham. If you plan a vacation in Massachusetts, look for hotels and other accommodation in Hingham. Hingham has rooms for a wide range of budgets as well as car hire and transport links.

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