Surf Forecasts:
Nantasket Beach surf forecast from 17 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 5PM (local time) - 1.5ft (0.5m), 8s period, E swell with 28 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 0.5m 8s and forecast to arrive on Thursday (Aug 20) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Thu 20th Aug) | 1.5ft (0.5m) 8s |
Table - best surf conditions forecast for Nantasket Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it. I’ve got the full 16-day look at Nantasket Beach, and I’m not gonna beat around the bush—it’s a tough stretch. We’re looking at a long, dry gap with no real surf to speak of for the first week and a half, so don’t be in a rush to wax up.
The water temp is sitting at about 69°, which is pretty much normal for this time of year, so at least the water’s comfortable.
The first real pulse of energy shows up around Wednesday the 26th, with a bump in swell from the NNE. We’re talking about 4 ft swell on the Wednesday morning, building to 5 ft by the afternoon. The combined energy ramps up to 103, then 153, so it’s moderate energy. The period is a short 6 seconds though, so this is windswell, not the good stuff. Winds are cross-shore, coming from the SSE, so it’s going to be a bit lumpy and choppy. It’s not great, but it’s something.
Then Thursday the 27th morning brings the biggest swell of the window—5 ft from the NE with a 7-second period, and the combined energy hits 393, which is solid moderate energy. The wind is light and cross-onshore from the SE, so it’s not clean, but the size is there. This is getting into the “too big for beginners” range, and with the short period, it’s going to be a bit of a mess. The afternoon drops slightly to 5 ft, still from the NE, but the wind goes onshore from the E, so it’s choppy.
After that, Friday the 28th morning sees a drop to 2 ft from the ENE, but here’s the standout: the wind swings to light offshore from the W. That’s a clean window. The swell is small, only 2 ft with a 6-second period, and combined energy is just 41, so it’s weak. But if you’re desperate for a clean, glassy-ish session with no crowds (it’s Nantasket, so crowds are only sometimes a problem), this is your best bet. The swell direction is ENE, and the optimum is NE, so it’s close enough.
The rest of the 16 days trails off into tiny, weak surf with energy readings in the single digits and teens. Not worth paddling out for.
So, to wrap it up: there’s a real dry spell until the 26th. The best on offer is the Thursday the 27th for size, but it’s messy. My pick for the cleanest ride is the Friday morning the 28th—small, but clean offshores. Don’t expect much else.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon afternoon. Warm (max 29°C on Wed afternoon, min 19°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 39mm), heaviest during Thu morning. Warm (max 27°C on Wed night, min 17°C on Sat morning). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | SSE 4 | SSE 4 | SE 4 | ESE 5 | E 5 | ENE 5 | NE 5 | E 6 | SE 4 | ESE 6 | E 8 | E 8 | E 8 | E 8 | ENE 5 | E 8 | E 7 | E 7 | E 7 |
Wave Graph | |||||||||||||||||||
3 | 2 | 5 | 9 | 12 | 17 | 11 | 18 | 22 | 12 | 10 | 28 | 18 | 19 | 12 | 18 | 10 | 9 | 22 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-on | cross | cross-on | glassy | cross-off | glassy | off | cross-on | cross-on | cross | cross-on | on | on | cross-on | cross-on | glassy |
High Tide | 3:04AM2.92m | 3:27PM2.98m | 3:54AM2.73m | 4:15PM2.89m | 4:47AM2.55m | 5:05PM2.78m | 5:44AM2.40m | 5:58PM2.69m | 6:41AM2.30m | 6:52PM2.64m | 7:41AM2.26m | 7:49PM2.62m | |||||||
Low Tide | 8:52PM0.01m | 9:12AM0.06m | 9:42PM0.11m | 9:59AM0.24m | 10:35PM0.22m | 10:48AM0.41m | 11:31PM0.33m | 11:40AM0.55m | 00:28AM0.41m | 12:35PM0.65m | 1:27AM0.45m | 1:31PM0.69m | 2:27AM0.45m | ||||||
— | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | |
7:43 | — | 7:42 | — | — | 7:39 | — | — | 7:38 | — | — | 7:37 | — | — | 7:36 | — | — | 7:34 | — | |
mm | 1 | 4 | 6 | 6 | — | — | — | — | — | — | 19 | — | — | — | — | 5 | 14 | 1 | — |
Temp °C | 22 | 19 | 21 | 21 | 20 | 21 | 19 | 25 | 29 | 27 | 19 | 20 | 19 | 20 | 21 | 19 | 18 | 18 | 19 |
Feels °C | 20 | 18 | 22 | 23 | 21 | 21 | 20 | 26 | 30 | 26 | 18 | 21 | 20 | 18 | 20 | 19 | 16 | 17 | 21 |
Swell 1 Height (m) Direction Period (s) | E 9 | SE 4 | E 9 | ESE 5 | E 5 | ESE 9 | NE 5 | E 6 | ESE 4 | ESE 6 | E 8 | E 8 | E 8 | E 8 | ENE 5 | E 8 | E 7 | E 7 | E 7 |
1 | 1 | 2 | 9 | 12 | 15 | 11 | 18 | 7 | 12 | 10 | 28 | 18 | 19 | 12 | 18 | 10 | 9 | 22 | |
Swell 2 Height (m) Direction Period (s) | — | E 9 | — | E 9 | E 8 | E 5 | ESE 7 | E 9 | ENE 5 | E 8 | ESE 6 | SE 7 | — | E 15 | E 8 | ENE 4 | E 13 | E 13 | E 13 |
— | 2 | — | 2 | 1 | 5 | 9 | 1 | 9 | 5 | 4 | 14 | — | 4 | 11 | 3 | 3 | 3 | 3 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | ESE 9 | ESE 9 | ESE 6 | — | — | — | E 15 | E 15 | E 14 | E 14 | — | — | E 13 |
— | — | — | — | — | — | 8 | 7 | 4 | — | — | — | 4 | 4 | 4 | 4 | — | — | 13 | |
Wind waves Height (m) Direction Period (s) | SSE 4 | SSE 4 | SE 4 | — | N 3 | ENE 5 | — | — | SE 4 | — | — | — | — | ENE 4 | — | SE 3 | E 4 | ESE 4 | — |
3 | 2 | 5 | — | 5 | 17 | — | — | 22 | — | — | — | — | 10 | — | 3 | 1 | 3 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1838 | 241 | 131 | 90 | 117 | 17 | 55 | 58 | 12 | 55 | 653 | 1953 | 67 | 523 | 653 | 108 | 403 | 1104 | 31 |
Best forecast wave conditions in Massachusetts | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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.











