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Data sources

NWPS — nearshore wave model
WAVEWATCH III — spectral swell
HRRR — 3 km wind
NDBC — realtime buoys
CO-OPS — tide predictions

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Forecasts refresh every 8 h · buoys every 3 h

Massachusetts

Green Harbor

FLATUpdated 0 min ago

Face

0.3ft

10s period

Swell

ESE

104°

Windcross-on

12 mph

S

Tide

↑1.9 ft

rising

ConditionsBlown out

Blown out

91% wind sea

Swell breakdown

WAVEWATCH III

Wind sea

S

2.2ft

4s

not surfable

not surfable

P1 (primary)

ESE

0.4ft

10s

100%

Swell components (ft) · next 48h

Wind speed (mph) · next 48h

Tide (ft) · next 48h

Spot info

Break—

Tide preference—

Crowd—

Hazards—

Optimal conditions

SwellSSE 153°

WindNNW offshore

Tideany

Period10s+

Break—

Nearest buoy

BuoyNDBC 44013

Hs—

Tp—

Dir—

Water65°F

Reading7/1/2026, 10:40:00 PM

View NDBC station page →

7-day forecast

Time

Rating

Face

Period

Swell

Wind

Tide

Wed, Jul 1

8pm

FLAT

0.3

9s

ESE104°

11mphcross-on

5.1ft

8pm

FLAT

—

3s

SSW210°

——mph

—

11pm

FLAT

0.3

10s

ESE107°

11mphcross-on

9.9ft

11pm

FLAT

—

3s

SW215°

——mph

—

Thu, Jul 2

2am

FLAT

—

3s

SW217°

——mph

—

2am

FLAT

0.3

10s

ESE107°

11mphcross-on

6.6ft

5am

FLAT

—

2s

SW216°

——mph

—

5am

FLAT

0.5

8s

SE129°

11mphcross-on

0.8ft

8am

FLAT

—

3s

SSW191°

——mph

—

8am

0.6

6s

SE144°

10mphcross-on

2.7ft

11am

FLAT

—

9s

SE139°

——mph

—

11am

0.5

7s

SE131°

13mphcross-on

8.2ft↓

2pm

0.8

5s

SE137°

14mphcross-on

7.0ft

2pm

FLAT

—

5s

SE145°

——mph

—

5pm

1.0

4s

SSE153°

17mphcross

1.9ft

5pm

FLAT

—

3s

SSW195°

——mph

—

8pm

0.8

4s

SSE158°

12mphcross

3.7ft

8pm

FLAT

—

3s

SSW207°

——mph

—

11pm

FLAT

0.5

7s

SE128°

10mphcross

9.3ft

11pm

FLAT

—

2s

SW215°

——mph

—

Fri, Jul 3

2am

FLAT

0.4

6s

E85°

8mphcross

7.9ft

2am

FLAT

—

2s

SW220°

——mph

—

5am

FLAT

0.3

8s

ESE105°

7mphcross

1.6ft

5am

FLAT

—

3s

WSW246°

——mph

—

8am

FLAT

0.4

5s

SE133°

3mphcross

1.7ft

8am

FLAT

—

7s

NNE16°

——mph

—

11am

FLAT

0.3

8s

ESE104°

7mphonshore

7.5ft

11am

FLAT

—

9s

E89°

——mph

—

2pm

FLAT

0.3

8s

ESE104°

6mphcross

8.0ft

2pm

FLAT

—

7s

ESE115°

——mph

—

5pm

FLAT

0.4

2s

ESE107°

5mphcross

2.7ft

5pm

FLAT

—

9s

ESE122°

——mph

—

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