Surf Forecasts:
Green Harbor surf forecast from 12 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 8PM (local time) - 2.5ft (0.8m), 4s period, SSW swell with 15 kJ wave energy.
Best Forecast Surf Conditions for Green Harbor this week:
The most powerful waves expected at Green Harbor in the next 16 days are 0.8m 4s and forecast to arrive on Tuesday (Jul 14) 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 0.7m 5s period and expected on Friday (Jul 17) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Tue 14th Jul) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for Green Harbor over the next 16 days.
Alright folks, Rusty here. Let’s be straight with you: this look at Green Harbor is a tough one. We’re staring down a 16-day stretch where the surf just doesn’t show up in any meaningful way. It’s a real flat spell, so don’t get your hopes up. The setup here is a sheltered beach and jetty, and when there’s no swell wrapping in, it’s just a lake. The first hint of any real rideable energy doesn’t pop up until the 20th of July, so you’re looking at over a week of nothing on offer.
The water temp is sitting at 68°F, which is 1°F warmer than the usual for this time of year – nothing wild, just a touch on the warm side of average.
The only time things start to get interesting is around Monday the 20th of July. The afternoon shows a bump in activity with a clean, cross-off breeze from the NNE at 15 mph. The swell is coming from the East at 3ft, with a period of 6 seconds. That’s short-period, windswelly stuff. The combined energy hits 59 (moderate energy), which is the most we see in the whole window. The wind is offshore and clean, so the surface will be nice, but the wave shape is going to be small and crumbly. It’s not a standout, but it’s the only game in town.
Tuesday the 21st of July morning has a similar size – 3ft from the ENE with a period of 7 seconds and a combined energy of 96 (moderate energy). The wind is a light cross-shore from the SSE at 5 mph, so it’s workable but not glassy. This is probably the best looking session of the whole period, but it’s still just small, weak windswell. For a confident intermediate, you might get a few fun ones, but it’s nothing to write home about.
Everything else is a total write-off. Tiny waves, onshore winds, or just flat calm. The beach break setup with this weak, short-period swell just isn’t doing anyone any favors. If you’re desperate for a paddle, maybe the 20th or 21st, but otherwise, keep the board in the car.
Rusty.
Short Range ForecastMostly dry. Warm (max 35°C on Tue afternoon, min 20°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 31°C on Wed morning, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
AM | PM | 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) | E 7 | E 7 | E 7 | E 10 | S 3 | SW 3 | SW 3 | SSW 3 | SW 3 | E 9 | E 9 | E 16 | E 15 | E 15 | NNE 3 | E 14 | N 4 | E 14 | E 13 | E 13 | E 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 4 | 4 | 2 | 4 | 4 | 2 | 9 | 6 | 2 | 2 | 5 | 4 | 4 | 2 | 4 | 10 | 4 | 4 | 3 | 3 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | on | cross-on | cross-on | on | on | on | on | cross | cross | cross-on | cross-on | cross-off | cross-on | cross-off | cross | cross-off | cross | cross-on | cross |
High Tide | 9:59AM2.67m | 10:14PM3.33m | 10:56AM2.76m | 11:11PM3.43m | 11:51AM2.85m | 00:05AM3.48m | 12:44PM2.94m | 00:59AM3.48m | 1:36PM3.00m | 1:52AM3.41m | 2:27PM3.04m | 2:44AM3.28m | 3:17PM3.05m | 3:37AM3.11m | |||||||
Low Tide | 3:53PM0.21m | 4:43AM-0.22m | 4:50PM0.12m | 5:38AM-0.30m | 5:46PM0.03m | 6:31AM-0.35m | 6:40PM-0.04m | 7:22AM-0.36m | 7:34PM-0.06m | 8:12AM-0.31m | 8:28PM-0.05m | 9:01AM-0.22m | 9:22PM0.00m | ||||||||
 | |  | |  | | | | | |  |  | | | | | | | | |  | |
 | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — |
 | — | 8:17 | — | — | 8:17 | — | — | 8:16 | — | — | 8:15 | — | — | 8:15 | — | — | 8:15 | — | — | 8:14 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 |
Temp °C | 21 | 21 | 21 | 24 | 26 | 21 | 29 | 35 | 29 | 31 | 29 | 28 | 28 | 30 | 25 | 22 | 25 | 23 | 23 | 25 | 21 |
Feels °C | 20 | 20 | 19 | 22 | 22 | 17 | 27 | 33 | 27 | 32 | 29 | 29 | 27 | 28 | 25 | 19 | 24 | 22 | 21 | 22 | 20 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | ENE 4 | E 7 | E 10 | E 10 | E 9 | E 9 | SE 9 | W 3 | ENE 2 | SE 9 | SE 9 | SE 9 | NNE 3 | SE 9 | N 4 | NNE 4 | E 13 | — | E 13 |
| kJ | 9 | 4 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 1 | 1 | 3 | 3 | 3 | 2 | 3 | 10 | 2 | 4 | — | 3 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | E 10 | E 7 | E 10 | E 7 | E 8 | E 8 | SE 6 | E 8 | E 9 | E 9 | — | E 15 | E 15 | E 8 | E 14 | E 8 | E 14 | SE 8 | E 13 | — |
| kJ | 10 | 2 | 4 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | — | 4 | 4 | 1 | 4 | 1 | 4 | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | S 6 | SE 10 | E 10 | — | — | S 9 | — | E 7 | — | SE 5 | S 5 | E 16 | — | E 15 | SE 5 | — | E 14 | E 8 | SE 8 | E 8 | E 8 |
| kJ | 1 | 4 | 2 | — | — | 2 | — | 1 | — | 1 | 1 | 5 | — | 4 | 1 | — | 4 | 1 | 3 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 4 | — | — | S 3 | SW 3 | SW 3 | SSW 3 | SW 3 | — | — | — | — | — | — | N 5 | — | — | N 3 | — | SSE 3 |
| kJ | 3 | 3 | — | — | 4 | 4 | 2 | 9 | 6 | — | — | — | — | — | — | 22 | — | — | 1 | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 524 | 647 | 649 | 649 | 1635 | 543 | 555 | 341 | 131 | 102 | 77 | 102 | 151 | 2480 | 151 | 1825 | 2480 | 515 | 524 | 1228 | 337 |
Best forecast wave conditions in Massachusetts | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Green Harbor Surf forecast
The above surf forecast table for Green Harbor provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Green Harbor can be found by selecting the local surf guide option on the grey menu. Our Green Harbor 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 (Green Harbor) 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 Green Harbor 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.
Green Harbor is 5 km (3 miles) from Duxbury. If you plan a vacation in Massachusetts, look for hotels and other accommodation in Duxbury. Duxbury has rooms for a wide range of budgets as well as car hire and transport links.
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