Surf Forecasts:
How big are the waves at Green Harbor today (21 Jul):
- Morning surf: Morning surf (21 Jul, local time) - 0.5ft (0.1m), 12s period with E swell.
- Afternoon surf: Afternoon surf (21 Jul, local time) - 2ft (0.6m), 3s period with SSE swell.
- Evening surf: Evening surf (21 Jul, local time) - 3.5ft (1.0m), 5s period with SE swell.
The current surf forecast for Green Harbor at 10AM is: 0.1m 12s primary swell from a East direction and 0.1m 8s secondary swell from a East direction, 0.3m 2s secondary swell from a South-southeast direction (forecast issued at 07:00am July 21). The wind direction is predicted to be cross-onshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Jul) | 0.5ft (0.1m) | 12s |
| Afternoon (21 Jul) | 2ft (0.6m) | 3s |
| Evening (21 Jul) | 3.5ft (1.0m) | 5s |
Table - waves today at Green Harbor. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 12mm), heaviest on Tue night. Warm (max 28°C on Wed afternoon, min 17°C on Thu morning). Winds decreasing (fresh winds from the SSW on Tue night, calm by Thu night). | |||||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
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 | 5 PM | 8 PM | 11 PM | |
Swell Height Map |  |  |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | E 12 | E 12 | E 12 | E 12 | SE 4 | SE 5 | SSE 5 | SSE 6 | ESE 5 | SE 5 | ESE 6 | SE 8 | SE 6 | ESE 10 | SE 11 | ESE 10 | ESE 10 | SE 10 | SE 8 | SE 9 | SE 8 | ESE 8 | ESE 8 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 3 | 3 | 3 | 4 | 13 | 35 | 49 | 34 | 11 | 7 | 15 | 17 | 8 | 40 | 55 | 42 | 40 | 25 | 18 | 20 | 15 | 11 | 12 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross | on |
High Tide | 5:27AM2.72m | 5:54PM2.90m | 6:25AM2.56m | 6:49PM2.83m | 7:25AM2.44m | 7:44PM2.77m | |||||||||||||||||
Low Tide | 11:31AM0.24m | 00:10AM0.25m | 12:24PM0.39m | 1:09AM0.32m | 1:19PM0.51m | ||||||||||||||||||
 |  |  | |  |  |  |  | | | |  | | | | | | | | | | |  | |
 | 5:24 | — | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — | — | 5:26 | — | — | — | — | — | — |
 | — | — | — | — | — | 8:12 | — | — | — | — | — | — | — | 8:10 | — | — | — | — | — | — | — | 8:09 | — |
mm | — | — | — | — | 2 | 5 | 3 | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 23 | 25 | 21 | 22 | 22 | 22 | 22 | 22 | 26 | 28 | 28 | 25 | 21 | 19 | 18 | 17 | 20 | 21 | 20 | 20 | 20 |
Feels °C | 18 | 19 | 20 | 22 | 18 | 21 | 19 | 20 | 21 | 21 | 24 | 26 | 27 | 24 | 18 | 16 | 16 | 14 | 17 | 18 | 16 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | E 12 | E 8 | E 12 | E 12 | E 11 | E 11 | E 11 | E 11 | ESE 5 | SE 5 | ESE 6 | SE 8 | SE 6 | ESE 10 | SE 11 | ESE 10 | ESE 10 | SE 10 | SE 8 | SE 9 | SE 8 | ESE 8 | ESE 8 |
| kJ | 3 | 1 | 3 | 3 | 2 | 2 | 2 | 2 | 11 | 7 | 15 | 17 | 8 | 40 | 55 | 42 | 40 | 25 | 18 | 20 | 15 | 11 | 12 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 12 | E 8 | — | — | — | — | — | E 11 | SE 8 | — | — | ESE 8 | — | SSW 5 | SSW 5 | SSW 9 | SSW 8 | ESE 10 | N 3 | N 3 | — | — |
| kJ | 1 | 3 | 1 | — | — | — | — | — | 2 | 3 | — | — | 7 | — | 28 | 9 | 25 | 6 | 10 | 1 | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 10 | SSW 9 | — | SW 9 | SW 9 | — | — | NNW 3 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 18 | 8 | — | 3 | 3 | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | — | — | SSE 3 | SSE 3 | SE 4 | SE 5 | SSE 5 | SSE 6 | SSW 3 | S 3 | S 3 | S 3 | SSW 3 | S 3 | WSW 3 | WNW 2 | — | NW 3 | NNW 3 | — | — | — | — |
| kJ | — | — | 1 | 4 | 13 | 35 | 49 | 34 | 4 | 5 | 8 | 6 | 8 | 8 | 1 | 1 | — | 1 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 647 | 515 | 647 | 647 | 1198 | 1198 | 1198 | 1198 | 574 | 124 | 124 | 91 | 6 | 6 | 43 | 43 | 43 | 43 | 6 | 61 | 72 | 85 | 124 |
Best forecast wave conditions in Massachusetts | |||||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||||
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