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Thermopylae Surf Forecast
/ Cape Town (70 surf breaks) /
Surf Forecasts:
Thermopylae surfForecast / Cape Town / South Africa
48hr Weather and Surf, issued 1 am Wednesday 20 May 2026 SASTForecast update in hr min s Forecast update imminent
Thermopylae surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Thermopylae sea temperature is
15.9° C
(Which is 1.2°C colder than average for this time of year)How big are the waves at Thermopylae today?
The current surf forecast for Thermopylae at 6AM is: 2.4m 9s primary swell from a Southeast direction and 1.5m 9s secondary swell from a South-southeast direction, 0.8m 12s secondary swell from a West-southwest direction (forecast issued at 01:00am May 20). The wind direction is predicted to be cross-offshore and the swell rating is 4.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 7ft (2.1m) | 9s |
| Afternoon (20 May) | 2.5ft (0.7m) | 12s |
| Evening (20 May) | 3ft (0.9m) | 8s |
Table - waves today at Thermopylae. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 2mm), mostly falling on Fri morning. Warm (max 20°C on Wed afternoon, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 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 | |
Swell Height Map |    |    |    | |||||||||||||||||||||
SSE 10 | SE 9 | SE 9 | SE 9 | WSW 12 | WSW 12 | SSE 8 | WSW 11 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 20 | SW 20 | SW 19 | SW 18 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | |
566 | 1064 | 720 | 535 | 147 | 119 | 104 | 68 | 96 | 114 | 111 | 138 | 118 | 136 | 134 | 181 | 314 | 311 | 366 | 443 | 498 | 492 | 605 | 685 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | off | glassy | cross-on | glassy | glassy | glassy | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-off | cross | glassy | cross-off | cross-off | |
High Tide | 5:38AM1.65m | 6:15PM1.65m | 6:34AM1.52m | 7:15PM1.57m | 7:40AM1.40m | 8:24PM1.51m | ||||||||||||||||||
Low Tide | 11:30PM0.47m | 11:54AM0.42m | 00:30AM0.57m | 12:50PM0.54m | 1:42AM0.65m | 1:58PM0.64m | ||||||||||||||||||
 | |  | | | |  | | | |  | | | |  | | | |  |  | | | | | |
 | — | 7:33 | — | — | — | — | — | — | — | 7:35 | — | — | — | — | — | — | — | 7:35 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:49 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | |
Temp °C | 17 | 17 | 16 | 18 | 20 | 19 | 19 | 19 | 18 | 17 | 17 | 17 | 18 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 17 |
16 | 16 | 15 | 18 | 20 | 18 | 19 | 20 | 18 | 16 | 16 | 15 | 16 | 16 | 15 | 16 | 14 | 13 | 13 | 13 | 14 | 17 | 16 | 17 | |
Swell 1 Height (m) Direction Period (s) | WSW 12 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | S 7 | S 8 | S 7 | S 7 | S 7 | SW 12 | SW 12 | SW 12 | SW 12 | SW 18 | SW 18 | SW 18 | SW 16 | SW 16 | SW 6 | SW 15 | SW 15 |
 kJ | 233 | 426 | 288 | 185 | 147 | 119 | 104 | 35 | 72 | 70 | 44 | 50 | 118 | 116 | 114 | 110 | 314 | 311 | 366 | 443 | 498 | 91 | 605 | 685 |
Swell 2 Height (m) Direction Period (s) | — | WSW 12 | WSW 12 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | SSE 9 | WSW 11 | SW 14 | SW 13 | SW 13 | S 7 | S 7 | S 7 | SW 19 | SW 11 | SW 11 | SW 11 | SW 11 | SW 6 | SW 16 | SSW 6 | SSW 6 |
| kJ | — | 230 | 184 | 180 | 125 | 119 | 82 | 50 | 47 | 114 | 111 | 138 | 35 | 33 | 23 | 181 | 126 | 121 | 119 | 115 | 64 | 492 | 96 | 78 |
Swell 3 Height (m) Direction Period (s) | — | SSE 12 | SE 12 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | WSW 11 | SW 14 | WSW 11 | WSW 11 | WSW 11 | SW 21 | SW 20 | SW 20 | S 7 | S 7 | S 6 | SSW 6 | SSW 7 | WSW 10 | SW 11 | — | — |
| kJ | — | 30 | 37 | 71 | 70 | 68 | 45 | 68 | 96 | 46 | 45 | 12 | 68 | 136 | 134 | 23 | 21 | 12 | 11 | 47 | 97 | 117 | — | — |
Wind waves Height (m) Direction Period (s) | SSE 10 | SE 9 | SE 9 | SE 9 | — | — | — | — | — | — | — | NW 2 | NW 2 | NW 3 | NW 3 | NW 3 | NNW 3 | NNW 3 | NNW 4 | N 3 | N 4 | — | — | — |
| kJ | 566 | 1064 | 720 | 535 | — | — | — | — | — | — | — | 1 | 1 | 2 | 2 | 1 | 3 | 6 | 10 | 6 | 6 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 21 | 0 | 0 | 0 | 11 | 11 | 11 | 24 | 17 | 17 | 6 | 6 | 6 | 6 | 0 | 6 | 0 | 0 | 0 |
Best forecast wave conditions in Cape Town | ||||||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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