Thermopylae 48 hour detailed Surf Forecast

Lat Long: 33.90° S 18.40° E

Issued: 1 am 20 Jul 2026 (local time)

Forecast update in hr min

Today's Thermopylae sea temperature is

14.6° C

Thermopylae 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 Thermopylae today (20 Jul):

Morning surf: Morning surf (20 Jul, local time) - 6ft (1.8m), 10s period with SW swell.
Afternoon surf: Afternoon surf (20 Jul, local time) - 5ft (1.5m), 9s period with SW swell.
Evening surf: Evening surf (20 Jul, local time) - 2.5ft (0.8m), 10s period with SW swell.

The current surf forecast for Thermopylae at 8AM is: 1.9m 10s primary swell from a Southwest direction and 0.7m 10s secondary swell from a West direction, 0.3m 3s secondary swell from a North-northwest direction (forecast issued at 01:00am July 20). The wind direction is predicted to be cross-offshore and the swell rating is 3.

Time (SAST) & Date	Wave Height	Wave Period
Morning (20 Jul)	6ft (1.8m)	10s
Afternoon (20 Jul)	5ft (1.5m)	9s
Evening (20 Jul)	2.5ft (0.8m)	10s

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

	Short Range Forecast Mostly dry. Very mild (max 16°C on Mon afternoon, min 12°C on Tue morning). Wind will be generally light.
	Monday 20								Tuesday 21								Wednesday 22
	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	2 AM	5 AM	8 AM	11 AM	2 PM	5 PM	8 PM	11 PM
Rating (10 max)	3	2	3	2	2	1	2	3	3	3	4	4	3	3	4	4	4	4	4	4	3	3	3	3
Swell Height Map See all maps
Wave Height (m) Direction Period (s)	SW 11	SW 10	SW 10	SW 9	SW 9	SW 8	SW 10	SW 16	SSW 16	SSW 15	SSW 14	SW 14	SW 14	SW 13	SW 13	SW 13	SW 13	SW 12	SW 12	SW 12	SW 12	SW 12	SW 12	SW 12
Wave Graph
kJ	1060	842	701	440	388	273	129	268	318	584	1667	2483	2763	2653	2436	2114	1799	1643	1494	1381	1381	1189	1088	617
Wind (km/h)	N	N	NNE	N	NNW	NW	W	SW	ESE	E	ESE	SSE	S	S	SSE	SSE	S	SW	SSW	WNW	WNW	NW	NNW	NNW
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy	cross	cross	cross-off	cross	cross-on	cross-on	on	glassy	glassy	glassy	glassy	glassy	cross	cross	cross-off	cross-off	glassy	glassy	glassy	glassy	on	cross-on	cross	cross
High Tide			7:28AM1.40m				7:55PM1.52m					8:20AM1.30m				8:49PM1.42m				9:27AM1.22m				9:56PM1.35m
Low Tide	1:31AM0.57m				1:29PM0.60m					2:24AM0.66m				2:19PM0.71m				3:28AM0.73m				3:26PM0.79m


	—	7:47	—	—	—	—	—	—	—	7:46	—	—	—	—	—	—	—	7:46	—	—	—	—	—	—
	—	—	—	—	—	5:58	—	—	—	—	—	—	—	5:59	—	—	—	—	—	—	—	5:59	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Temp °C	14	13	13	14	16	15	15	14	13	13	12	13	14	14	13	13	12	12	12	13	14	14	14	14
Feels °C	12	10	11	11	14	13	14	13	12	13	11	12	12	11	10	11	11	11	12	12	11	12	11	11
Swell 1 Height (m) Direction Period (s)	SW 11	SW 10	SW 10	SW 9	SW 9	SW 8	SW 8	SW 8	SSW 8	SSW 15	SSW 14	SW 14	SW 14	SW 13	SW 13	SW 13	SW 13	SW 12	SW 12	SW 12	SW 12	SW 12	SW 12	SW 12
kJ	1060	842	701	440	388	273	129	119	98	584	1667	2483	2763	2653	2436	2114	1799	1643	1494	1381	1381	1189	1088	617
Swell 2 Height (m) Direction Period (s)	W 9	W 10	W 10	W 10	WNW 10	W 10	SW 10	SW 16	SSW 16	SW 7	W 9	W 9	W 9	W 9	SE 11	SE 11	SE 11	SE 11	SE 11	SSW 15	SSW 15	SSW 14	SSW 14	SSW 13
kJ	142	125	94	94	128	120	124	268	318	77	40	39	25	14	31	31	30	18	18	42	72	158	145	418
Swell 3 Height (m) Direction Period (s)	SSE 10	SSE 9	SSE 9	SSE 9	SSE 9	SW 18	W 10	SW 12	SW 12	SSW 10	SW 11	SE 11	W 9	W 9	—	—	—	—	—	ESE 11	ESE 11	ESE 11	ESE 11	ESE 14
kJ	18	17	16	16	8	80	92	175	172	73	31	43	14	14	—	—	—	—	—	12	12	12	12	18
Wind waves Height (m) Direction Period (s)	—	—	NNW 3	NNW 3	W 10	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	NW 4
kJ	—	—	2	1	70	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	14
Nearest Offshore or Glassy	Bali Bay (Glen Reef) Cape Town	Bali Bay (Glen Reef) Cape Town	Thermopylae Cape Town	Bali Bay (Glen Reef) Cape Town	Dungeons Cape Town	Dungeons Cape Town	Dungeons Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Off The Wall Cape Town	Off The Wall Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Thermopylae Cape Town	Dungeons Cape Town	Dungeons Cape Town	Bloubergstrand Cape Town	Bloubergstrand Cape Town
Rating (10 max)	4	3	3	3	2	2	1	3	3	3	4	4	4	4	4	4	4	4	4	4	3	3	4	4
Distance (km)	6	6	0	6	17	17	17	0	0	0	0	0	1	1	0	0	0	0	0	0	17	17	11	11
Best forecast wave conditions in Cape Town	Kreefte Reef	Haakgat	Kreefte Reef	Kreefte Reef	Hout Bay	Hout Bay	Hout Bay	Bali Bay (Glen Reef)	The Hoek	Kreefte Reef	Van Riebeek	Hout Bay	The Hoek	Kamer Van	The Hoek	The Hoek	Kreefte Reef	Kreefte Reef	Kreefte Reef	Haakgat	Hout Bay	Hout Bay	Van Riebeek	Van Riebeek
Rating (10 max)	4	4	3	3	2	2	1	3	3	3	4	4	4	4	4	4	4	4	4	4	3	3	4	4
Best forecast wave conditions in South Africa	Whispering Waves Eastern Cape - Wild Coast	Cintsa East Eastern Cape - Wild Coast	Whacky Point Eastern Cape - Wild Coast	Whispering Waves Eastern Cape - Wild Coast	Vleesbaai Overberg	Gerickes Point Garden Route	Haga-Haga Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Fish Boma Garden Route	Fish Boma Garden Route	Fish Boma Garden Route	Moonlight Bay Overberg	Haga-Haga Eastern Cape - Wild Coast	Double Mouth Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Periwinkles Eastern Cape - Wild Coast	Hamburg (Port Alfred) Eastern Cape (S)	Hout Bay Cape Town	Hout Bay Cape Town	Kleinemonde Eastern Cape (S)	Vleesbaai Overberg
Rating (10 max)	4	4	4	4	2	3	4	3	3	4	4	4	4	4	4	4	4	4	4	4	3	3	4	4
Header Global	Otago Peninsula - Allans Beach New Zealand	Otago Peninsula - Allans Beach New Zealand	Ning Nong Point and Reef New Zealand	Ning Nong Point and Reef New Zealand	Last Chance New Zealand	Last Chance New Zealand	Seconds (White Rock) New Zealand	Diners Beach New Zealand	Purakaunui Bay New Zealand	Purakaunui Bay New Zealand	Aganoa Beach Samoa	Aganoa Beach Samoa	Jongensfontein South Africa	Bruces Beauties South Africa	Sea Vista South Africa	Cobblestones Australia	Cobblestones Australia	Cobblestones Australia	Cobblestones Australia	Cobblestones Australia	Cow Bombie Australia	Hanga Poukura Chile	Hanga Poukura Chile	Cathedral Rock Australia
Rating (10 max)	5	5	7	6	5	5	5	5	5	5	4	4	5	5	5	5	6	5	6	6	5	6	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)

Latest Updates

Ben Mondy

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Thermopylae 48 hour detailed Surf Forecast

How big are the waves at Thermopylae today (20 Jul):

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