Cape Kersaint Surf Forecast

/ SA – Kangaroo Island (8 breaks) / South Australia (91 breaks) /

Australia (828 breaks) / Lat Long: (36.03° S 137.13° E)

Surf Forecasts:

Cape Kersaint surfForecast / SA – Kangaroo Island / Australia

12 Day Weather and Surf, issued 2 am Wednesday 17 Sep 2025 ACST

Forecast update in hr min s Forecast update imminent

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

Today's Cape Kersaint sea temperature is 15.1° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Cape Kersaint this week:

The surf forecast for Cape Kersaint over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 17) at 9AM. The primary swell is predicted to be 4.0m and 14s period. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Cape Kersaint in the next 12 days are 4.5m 13s and forecast to arrive on Saturday (Sep 20) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (Sep 18) at 6AM.

Wave Type	Time (ACST) & Date	Wave Height & Period
Next good surf (1 star+)	9AM (Wed 17th Sep)	13ft (4.0m) 14s
Best Surf	9AM (Wed 17th Sep)	13ft (4.0m) 14s
Most Powerful	12AM (Sat 20th Sep)	15ft (4.5m) 13s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Light rain (total 2mm), mostly falling on Fri afternoon. Warm (max 21°C on Thu afternoon, min 11°C on Wed night). Winds increasing (light winds from the WSW on Wed morning, strong winds from the WNW by Fri morning).									Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Sun night. Very mild (max 15°C on Sun morning, min 11°C on Mon afternoon). Mainly fresh winds.
	Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	!	!	4	3	3	4	2	0	0	!	!	!	!	!	!	0	0	0	!	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SW	SW	SW	SW	SW	SW	SW	WSW	SW	SW	SSW	SW	SSW	SW	SW	SW	SSW	SSW	SSW	SW	SSW
Period(s) (?)	14	14	13	12	12	12	12	12	13	13	14	14	13	13	13	13	14	14	13	19	18
Wave Graph (?)
kJ (?)	6497	4812	2319	1034	1229	1369	1269	3891	7110	5528	5095	4240	3357	3619	2483	3278	4504	5118	3281	2615	1736
Wind (km/h)	W	NW	N	NNW	WNW	NW	WNW	WSW	SW	WSW	W	W	W	W	W	SSW	S	SSW	SW	SW	WSW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross- off	off	off	cross- off	cross- off	cross- off	cross	cross- on	cross	cross	cross	cross	cross	cross	cross- on	on	on	cross- on	cross- on	cross- on
High Tide / height (m)	11:04AM 0.90			11:17AM 0.94		12:21AM 0.57	11:33AM 0.96		11:54PM 0.66	11:49AM 0.97		11:59PM 0.78	12:05PM 0.95		12:14AM 0.88	12:20PM 0.93		12:34AM 0.96		12:34PM 0.90	12:55AM 1.02
Low Tide / height (m)			7:27PM 0.29			6:59PM 0.34	4:37AM 0.46		6:34PM 0.36	5:15AM 0.37	6:21PM 0.34		5:46AM 0.31	6:19PM 0.31		6:15AM 0.28	6:25PM 0.27		6:42AM 0.28		6:34PM 0.23

	Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23
Sunrise	6:18	-	-	6:18	-	-	6:16	-	-	6:15	-	-	6:13	-	-	6:11	-	-	6:09	-	-
Sunset	-	6:13	-	-	6:14	-	-	6:14	-	-	6:15	-	-	6:15	-	-	6:16	-	-	6:16	-

Rain (mm)	-	-	-	-	-	-	-	2	-	-	-	-	-	-	2	-	-	-	-	-	-
Temp. °C	14	15	12	19	21	13	16	13	12	12	13	13	15	15	14	12	12	12	12	12	13
Feels °C (?)	10	10	8	12	16	11	8	5	3	6	7	8	10	9	10	5	6	5	7	7	8

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 SA - Kangaroo Island

Wind Update Continuing clean conditions at Cape Kersaint (light winds from the SSW at ParndanaCfsAws 29 km from Cape Kersaint). 4.2m 15s groundswell from the SW with a 4.1m 15s groundswell from the SSW. 2 swells combining so expect closeout sets.
1 hour 1 minute ago Cape Kersaint

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29 km away, 1 h 1 min ago

7 km/h

SSW

0.0

15.1

Air / Water (°C)

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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 Cape Kersaint 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 Cape Kersaint Surf forecast

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

Are you planning a holiday in Kangaroo Island? If you are looking for accommodation near Cape Kersaint, camping, hotels and holiday cottages in Kangaroo Island, consider staying in Kingscote which is 62 km (39 miles) away.