Extensions 48 hour detailed Surf Forecast

Lat Long: 34.34° S 18.46° E

Issued: 7 am 18 Sep 2026 (local time)

Forecast update in hr min

Today's Extensions sea temperature is

14.2°C

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

Surf Forecasts:

How big are the waves at Extensions today (18 Sep):

Morning surf: Morning surf (18 Sep, local time) - 5.5ft (1.7m), 11s period with SW swell.
Afternoon surf: Afternoon surf (18 Sep, local time) - 6ft (1.8m), 13s period with SW swell.
Evening surf: Evening surf (18 Sep, local time) - 5.5ft (1.7m), 13s period with SW swell.

The current surf forecast for Extensions at 11AM is: 1.6m 11s primary swell from a Southwest direction and 0.8m 14s secondary swell from a Southwest direction (forecast issued at 07:00am September 18). An open ocean swell of 2.2m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (SAST) & Date	Wave Height	Wave Period
Morning (18 Sep)	5.5ft (1.7m)	11s
Afternoon (18 Sep)	6ft (1.8m)	13s
Evening (18 Sep)	5.5ft (1.7m)	13s

Table - waves today at Extensions. (Swell directed towards the surf break)

	Short Range Forecast Mostly dry. Warm (max 20°C on Sun afternoon, min 12°C on Fri morning). Winds decreasing (near gales from the ESE on Fri afternoon, moderate winds from the ESE by Sun morning).
	Friday 18							Saturday 19								Sunday 20
	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
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	2	2	1	0	0	0
Swell Height Map See all maps
Wave Height (m) Direction Period (s)	SW 11	SW 11	SW 11	SW 13	SW 13	SW 13	SW 13	SW 12	SW 12	SW 12	SW 12	SW 12	SW 14	SW 14	SW 14	SW 13	SW 13	SW 13	SW 13	WSW 13	WSW 13	WSW 13	WSW 12
Wave Graph
kJ	770	770	600	1021	961	946	917	811	785	772	448	448	1163	1528	1857	1810	1682	1502	1288	1198	998	809	784
Wind (km/h)	ESE	ESE	ESE	SE	ESE	ESE	ESE	ESE	ESE	ESE	SE	SE	SE	SE	SE	ESE	ESE	ESE	ESE	SE	SE	SE	SE
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	cross-off	off	cross-off	cross-off	cross-off	cross-off	cross-off
High Tide		7:06AM1.01m				7:26PM1.01m					8:42AM0.91m				9:33PM0.93m					11:22AM0.95m
Low Tide				1:00PM0.63m				1:59AM0.64m					2:48PM0.73m				4:46AM0.66m					5:46PM0.68m


	6:41	—	—	—	—	—	—	—	6:39	—	—	—	—	—	—	—	6:39	—	—	—	—	—	—
	—	—	—	—	6:38	—	—	—	—	—	—	—	6:39	—	—	—	—	—	—	—	6:39	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Temp °C	12	12	14	16	16	14	13	13	12	12	14	15	15	16	15	15	15	16	18	20	19	18	17
Feels °C	2	2	4	6	4	4	5	5	5	5	8	7	5	7	7	8	8	10	14	14	11	11	11
Swell 1 Height (m) Direction Period (s)	SW 11	SW 11	SW 11	SW 13	SW 13	SW 13	SW 13	SW 12	SW 12	SW 12	SW 12	SW 12	SW 14	SW 14	SW 14	SW 13	SW 13	SW 13	SW 13	WSW 13	WSW 13	WSW 13	WSW 12
kJ	770	770	600	1021	961	946	917	811	785	772	448	448	1163	1528	1857	1810	1682	1502	1288	1198	998	809	784
Swell 2 Height (m) Direction Period (s)	—	—	SW 14	SW 20	WSW 18	SW 18	WSW 18	SW 16	SW 16	—	SW 14	SW 14	—	—	—	—	—	—	—	—	—	—	—
kJ	—	—	231	15	31	49	31	127	127	—	346	404	—	—	—	—	—	—	—	—	—	—	—
Swell 3 Height (m) Direction Period (s)	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
kJ	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Wind waves Height (m) Direction Period (s)	SE 6	SE 6	SE 6	SE 7	SE 7	SE 7	SE 7	SE 7	SE 7	SE 7	SE 7	SE 6	SE 7	SE 7	SE 7	SE 6	SE 6	SE 6	SE 6	SE 6	SE 6	SE 7	SE 6
kJ	278	307	386	437	588	610	508	385	371	382	321	325	480	509	439	352	317	275	228	228	374	437	328
Nearest Offshore or Glassy	Dumps Cape Town	Strand (Pipe) Cape Town	Sandy Bay Cape Town	Strand (Pipe) Cape Town	Dumps Cape Town	Milnerton Cape Town	Dumps Cape Town	Sandy Bay Cape Town	Koeel Bay Overberg	Kakapo Cape Town	Dunes Cape Town	The Hoek Cape Town	Dunes Cape Town	The Hoek Cape Town	Off The Wall Cape Town	Off The Wall Cape Town	Bikini Beach (Gordon's Bay) Cape Town	Sandy Bay Cape Town	Kakapo Cape Town	The Boiler Cape Town	Olifants Bos Cape Town	Noordhoek Cape Town	Koeel Bay Overberg
Rating (10 max)	3	2	2	2	3	3	3	3	2	3	3	3	3	3	4	4	1	3	4	4	4	4	2
Distance (km)	51	42	37	42	51	55	51	37	37	26	27	30	27	30	48	48	41	37	26	25	12	27	37
Best forecast wave conditions in Cape Town	Beach Road	Van Riebeek	Kreefte Reef	Kreefte Reef	Beach Road	Beach Road	Beach Road	Beach Road	Sollys	Sunset	Kreefte Reef	Kreefte Reef	Kreefte Reef	The Hoek	Sollys	Beach Road	Beach Road	Tweede Steen	Kreefte Reef	Kreefte Reef	Kreefte Reef	Beach Road	Beach Road
Rating (10 max)	3	3	3	3	3	3	4	4	4	4	3	3	3	3	4	4	4	4	4	4	4	4	3
Best forecast wave conditions in South Africa	Gerickes Point Garden Route	Gerickes Point Garden Route	Gerickes Point Garden Route	Gerickes Point Garden Route	Gerickes Point Garden Route	Pastures West Coast	Gerickes Point Garden Route	Gerickes Point Garden Route	Fish Boma Garden Route	Haga-Haga Eastern Cape - Wild Coast	Fish Boma Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Sea Vista Eastern Cape (S)	Igoda Eastern Cape - Wild Coast	Igoda Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Fish Boma Garden Route	Haga-Haga Eastern Cape - Wild Coast	Yellow sands Point Eastern Cape - Wild Coast	Gerickes Point Garden Route	Gerickes Point Garden Route
Rating (10 max)	4	4	4	4	4	3	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Header Global	Fox River New Zealand	Guns Namibia	Papatowai New Zealand	Otago Peninsula - Allans Beach New Zealand	Afife Portugal	Weld Road New Zealand	Weld Road New Zealand	El Huerto Spain	El Huerto Spain	Cathedral Rock Australia	Praia do Norte Portugal	Afife Portugal	Kaifu Rivermouth Japan	Trial Harbour Australia	Trial Harbour Australia	Jimmys Indonesia	Asu Indonesia	Asu Indonesia	Asu Indonesia	Gas Bay Australia	Papatowai New Zealand	Papatowai New Zealand	Papatowai New Zealand
Rating (10 max)	5	5	9	5	4	6	6	5	5	5	5	4	5	8	7	5	4	4	4	5	9	9	9

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

Latest Updates

Ben Mondy

Six Sun-Soaked Summer Surf Spots: Backed by 20 years of Swell and Wind Stats (and with our 20% Summer Subscription Sale)

Ben Mondy

Summer School: The Timeline of The Boardshort

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Extensions 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.

Extensions 48 hour detailed Surf Forecast

How big are the waves at Extensions today (18 Sep):

Short Range Forecast

Latest Updates

Road Testing the new Db Surf Roller Pro

Summer's Short. Life Is Long.

Roadsurfing in the Basque country

Six Sun-Soaked Summer Surf Spots: Backed by 20 years of Swell and Wind Stats (and with our 20% Summer Subscription Sale)

Summer School: The Timeline of The Boardshort

FREE! Surf-Forecast.com widget for your website