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 2PM is: 1.8m 13s primary swell from a Southwest direction and 0.1m 20s secondary swell from a Southwest direction (forecast issued at 07:00am September 18). An open ocean swell of 2.3m 7s 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	Strand (Pipe) Cape Town	Strand (Pipe) Cape Town	Big Bay Cape Town	Dumps Cape Town	Dumps Cape Town	Sandy Bay Cape Town	Koeel Bay Overberg	The Hoek Cape Town	Dunes Cape Town	Kakapo Cape Town	Boneyards Cape Town	Koeel Bay Overberg	Off The Wall Cape Town	Bikini Beach (Gordon's Bay) Cape Town	Bikini Beach (Gordon's Bay) Cape Town	Koeel Bay Overberg	The Hoek Cape Town	Kakapo Cape Town	The Boiler Cape Town	Boneyards Cape Town	Dumps Cape Town	Koeel Bay Overberg	Koeel Bay Overberg
Rating (10 max)	2	2	3	3	3	3	2	3	3	3	3	2	4	1	1	3	4	4	4	4	3	2	1
Distance (km)	42	42	61	51	51	37	37	30	27	26	26	37	48	41	41	37	30	26	25	26	51	37	37
Best forecast wave conditions in Cape Town	Kreefte Reef	Kreefte Reef	Beach Road	Beach Road	Van Riebeek	Beach Road	Sollys	Captains	Kreefte Reef	Sunset	Kreefte Reef		Sollys	Captains	Beach Road	Beach Road	Kreefte Reef	Kreefte Reef	Kreefte Reef	Beach Road	Dumps	Sollys	Kreefte Reef
Rating (10 max)	3	3	3	3	4	4	4	4	3	4	3		4	4	4	4	4	4	4	4	3	4	3
Best forecast wave conditions in South Africa	Gerickes Point Garden Route	Gerickes Point Garden Route	Doring Bay West Coast	Pastures West Coast	Gerickes Point Garden Route	Gerickes Point Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Queensberry Bay Eastern Cape - Wild Coast	Queensberry Bay Eastern Cape - Wild Coast	Haga-Haga Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Fish Boma Garden Route	Fish Boma Garden Route	Haga-Haga Eastern Cape - Wild Coast	Gerickes Point Garden Route	Gerickes Point Garden Route	Gerickes Point Garden Route	Haga-Haga Eastern Cape - Wild Coast	Fish Boma Garden Route
Rating (10 max)	4	4	3	3	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Header Global	Otago Peninsula - Papanui Beach New Zealand	Otago Peninsula - Allans Beach New Zealand	Otago Peninsula - Sandfly Bay New Zealand	Otago Peninsula - Allans Beach New Zealand	Weld Road New Zealand	El Huerto Spain	El Huerto Spain	Cathedral Rock Australia	Shingles New Zealand	Fairhaven Australia	Kaifu Rivermouth Japan	Trial Harbour Australia	Trial Harbour Australia	Easter Reef Australia	Asu Indonesia	Asu Indonesia	Gas Bay Australia	Easky Left Ireland	Papatowai New Zealand	Papatowai New Zealand	Cobblestones Australia	Shipwrecks Bay-Peaks New Zealand	Shipwrecks Bay-Peaks New Zealand
Rating (10 max)	5	5	5	4	6	5	5	5	5	5	5	8	8	5	4	4	5	5	9	9	6	8	8

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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Extensions 48 hour detailed Surf Forecast

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

Short Range Forecast

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