Green Bay Surf Forecast

/ North (7 surf breaks) /

Taiwan (13 surf breaks)

Surf Forecasts:

Green Bay surfForecast / North / Taiwan

12 Day Weather and Surf, issued 1 pm Monday 15 Sep 2025 CST

Forecast update in hr min s Forecast update imminent

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

Today's Green Bay sea temperature is 29.4° C
(Which is 1.8°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Green Bay this week:

The surf forecast for Green Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 20) at 8AM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.4m and 8s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Green Bay in the next 12 days are 1.9m 14s and forecast to arrive on Monday (Sep 22) 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 1.7m 7s period and expected on Monday (Sep 22) at 11AM.

Wave Type	Time (CST) & Date	Wave Height & Period
Next good surf (1 star+)	8AM (Sat 20th Sep)	3ft (0.9m) 6s
Best Surf	8AM (Sat 20th Sep)	3ft (0.9m) 6s
Most Powerful	8PM (Mon 22nd Sep)	6ft (1.9m) 14s

Table - best surf conditions forecast for Green Bay over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Mostly dry. Warm (max 31°C on Mon afternoon, min 28°C on Mon night). Mainly fresh winds.											Days 3-6 Weather Summary Heavy rain (total 45mm), heaviest during Fri morning. Warm (max 29°C on Thu afternoon, min 26°C on Thu night). Winds decreasing (strong winds from the ESE on Fri morning, light winds from the SE by Sat morning).
	Mon 15		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
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 See all maps
Wave Height (m) & direction (?)	SE	SE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	E	E	ESE	SE	ESE	E	ENE	NE	E	E	E	E
Period(s) (?)	4	5	9	8	5	7	7	4	6	4	5	6	6	6	10	5	6	11	10	10	12
Wave Graph (?)
kJ (?)	36	55	116	24	37	74	70	29	39	20	61	127	72	38	30	116	114	62	77	98	359
Wind (km/h)	SE	SE	ESE	ESE	SE	ESE	ESE	SE	ESE	ESE	ESE	ESE	SE	SE	SE	E	ESE	E	E	ESE	ENE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross	cross	cross	cross	cross	cross	cross	cross- on	cross	cross- on	cross	cross	cross	cross	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on
High Tide / height (m)	5:31PM 1.20	3:28AM 0.97		6:35PM 1.22	4:51AM 0.98		7:26PM 1.23		6:03AM 1.02		8:07PM 1.22	7:05AM 1.06		8:42PM 1.21	7:59AM 1.10		9:13PM 1.18	8:50AM 1.13		9:41PM 1.15	9:38AM 1.15
Low Tide / height (m)		11:40PM 0.89	10:46AM 0.19		12:49AM 0.85	11:55AM 0.19		1:32AM 0.80	12:55PM 0.20		2:06AM 0.73	1:45PM 0.22		2:35AM 0.66		2:29PM 0.26	3:03AM 0.59		3:09PM 0.33	3:31AM 0.51

	Mon 15		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21
Sunrise	-	-	5:39	-	-	5:39	-	-	5:39	-	-	5:39	-	-	5:39	-	-	5:41	-	-	5:41
Sunset	5:58	-	-	5:57	-	-	5:55	-	-	5:54	-	-	5:53	-	-	5:52	-	-	5:52	-	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	2	11	3	2	1	9	14	3	7	11	3
Temp. °C	31	29	31	31	29	31	31	28	30	29	27	27	28	27	28	27	26	27	26	27	28
Feels °C (?)	31	30	32	31	30	33	31	29	29	28	27	25	29	28	31	29	26	28	24	28	29

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for North

Wind Update Continuing clean conditions at Green Bay (calm at Tianliaogang wx 14 km from Green Bay). 1.0m 4s local chop from the SE to make surfable waves.
1 hour 5 minutes ago Green Bay

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1 h 5 min ago

0 km/h

Clean

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Green Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

Information about the Green Bay Surf forecast

The above surf forecast table for Green Bay provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Green Bay can be found by selecting the local surf guide option on the grey menu. Our Green Bay 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 Bay) 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 Bay 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 Bay is 15 km (9 miles) from the city of Keelung. If you plan a holiday in North Taiwan, look for hotels and other accommodation in Keelung. Keelung has rooms for a wide range of budgets as well as car hire and transport links.