Cape Northumberland Surf Forecast

/ SA – East Coast (28 breaks) / South Australia (91 breaks) /

Australia (828 breaks)

Surf Forecasts:

Cape Northumberland surfForecast / SA – East Coast / Australia

12 Day Weather and Surf, issued 9 pm Sunday 16 Nov 2025 ACDT

Forecast update in hr min s Forecast update imminent

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

Today's Cape Northumberland sea temperature is 14.7° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Cape Northumberland this week:

The surf forecast for Cape Northumberland over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Nov 23) at 4AM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 0.6m and 14s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Cape Northumberland in the next 12 days are 4.0m 14s and forecast to arrive on Thursday (Nov 20) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Nov 23) at 7PM.

Wave Type	Time (ACDT) & Date	Wave Height & Period
Next good surf (1 star+)	4AM (Sun 23rd Nov)	5ft (1.5m) 11s
Best Surf	4AM (Sun 23rd Nov)	5ft (1.5m) 11s
Most Powerful	7AM (Thu 20th Nov)	13ft (4.0m) 14s

Table - best surf conditions forecast for Cape Northumberland over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Light rain (total 2mm), mostly falling on Sun night. Very mild (max 15°C on Tue morning, min 12°C on Sun night). Mainly fresh winds.										Days 3-6 Weather Summary Mostly dry. Very mild (max 13°C on Sat afternoon, min 9°C on Fri night). Mainly fresh winds.
		Monday 17			Tuesday 18			Wednesday 19			Thursday 20			Friday 21			Saturday 22			Sun 23
	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	4	0	4	4	1	2	3	2	2	3	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	WSW	SW	SW	SW	WSW	WSW	SW	SW	SW	SW	SW	SW	SW	SSW	SSW	SW	S	SSW	SSW	SSW	SSW
Period(s) (?)	9	10	11	11	11	12	12	12	13	14	14	15	14	14	13	13	11	11	11	11	11
Wave Graph (?)
kJ (?)	1499	2000	2854	2388	2867	2405	2693	3120	4169	6496	6798	6221	4370	3128	2386	1144	586	843	643	444	308
Wind (km/h)	WSW	WSW	WSW	W	WNW	W	W	W	W	SW	SSW	S	SE	SE	SE	ESE	SE	SE	ESE	SE	SE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	on	on	on	cross- on	cross- on	cross- on	cross- on	on	on	cross- on	cross- on	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)	12:17AM 0.92	10:57AM 0.74		12:36AM 1.02	11:23AM 0.72		1:01AM 1.10	11:47AM 0.70		1:26AM 1.16	12:08PM 0.69		1:53AM 1.19	12:26PM 0.67		2:18AM 1.21	12:41PM 0.66		2:45AM 1.22	12:53PM 0.65
Low Tide / height (m)		6:36AM 0.63	5:19PM 0.39		7:11AM 0.60	5:39PM 0.32		7:44AM 0.58	6:01PM 0.26		8:15AM 0.57	6:22PM 0.22		8:46AM 0.57	6:43PM 0.20		9:18AM 0.58	7:02PM 0.20		9:53AM 0.61	7:22PM 0.20

		Monday 17			Tuesday 18			Wednesday 19			Thursday 20			Friday 21			Saturday 22			Sun 23
Sunrise	-	5:45	-	-	5:45	-	-	5:43	-	-	5:43	-	-	5:43	-	-	5:41	-	-	5:41	-
Sunset	-	-	7:59	-	-	8:00	-	-	8:00	-	-	8:01	-	-	8:02	-	-	8:04	-	-	8:05

Rain (mm)	1	-	-	-	-	1	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	12	13	14	14	15	15	14	13	13	12	12	12	12	11	12	11	12	13	14	16	17
Feels °C (?)	5	6	7	9	9	9	8	6	6	6	7	6	7	5	4	5	7	7	10	14	13

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

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Information about the Cape Northumberland Surf forecast

The above surf forecast table for Cape Northumberland provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Cape Northumberland can be found by selecting the local surf guide option on the grey menu. Our Cape Northumberland 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 (Cape Northumberland) 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 Cape Northumberland 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.

Cape Northumberland is 6 km (4 miles) from Allendale East. If you plan a holiday in South Australia - East Coast, look for hotels and other accommodation in Allendale East. Allendale East has rooms for a wide range of budgets as well as car hire and transport links.