Surf Forecasts:
Thermopylae surf forecast from 15 Sep 2026:
- Best quality surf: Monday 21 Sep, 11PM (local time) - 4.5ft (1.3m), 11s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 2AM (local time) - 11ft (3.5m), 14s period, WSW swell with 4,456 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 11PM (local time) - 4.5ft (1.3m), 11s period with WSW swell.
Best Forecast Surf Conditions for Thermopylae this week:
The surf forecast for Thermopylae over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 21) at 11PM. The primary swell is predicted to be 1.3m and 11s period with a secondary swell of 0.5m and 13s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Thermopylae in the next 16 days are 3.5m 14s and forecast to arrive on Wednesday (Sep 16) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Sunday (Sep 20) at 2AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 21st Sep) | 4.5ft (1.3m) 11s |
| Best Surf | 11PM (Mon 21st Sep) | 4.5ft (1.3m) 11s |
| Most Powerful | 2AM (Wed 16th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Thermopylae over the next 16 days.
Short Range ForecastModerate rain (total 15mm), heaviest on Tue night. Very mild (max 16°C on Tue morning, min 12°C on Wed night). Mainly strong winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri afternoon, min 14°C on Fri morning). Winds decreasing (strong winds from the SSE on Sat night, light winds from the SSE by Sun night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | NW 6 | SW 16 | WSW 14 | SW 13 | SW 13 | SSW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 13 | SW 13 | SW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 331 | 1001 | 4456 | 2528 | 1086 | 2431 | 1347 | 990 | 726 | 589 | 976 | 837 | 514 | 700 | 919 | 1459 | 1509 | 1049 | 680 | 556 | 419 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | 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 | cross-off |
High Tide | 5:38PM1.62m | 5:57AM1.48m | 6:09PM1.50m | 6:32AM1.36m | 6:43PM1.36m | 7:19AM1.25m | 7:33PM1.24m | 8:50AM1.17m | 9:28PM1.15m | 11:21AM1.20m | 11:45PM1.20m | 12:29PM1.32m | 00:43AM1.31m | ||||||||
Low Tide | 11:21AM0.48m | 11:46PM0.52m | 11:50AM0.60m | 00:18AM0.63m | 12:24PM0.73m | 00:57AM0.74m | 1:11PM0.85m | 2:06AM0.84m | 3:12PM0.95m | 4:29AM0.87m | 5:44PM0.89m | 6:01AM0.79m | 6:43PM0.77m | ||||||||
 | |  |  | |  | | | | | | | | |  | | | | | | | |
 | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:38 | — | — | 6:39 | — | — | 6:39 | — | — | 6:40 | — |
mm | — | — | 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 14 | 14 | 15 | 14 | 14 | 16 | 14 | 16 | 18 | 16 | 17 | 18 | 16 | 17 | 17 | 15 | 17 | 18 | 16 |
Feels °C | 9 | 7 | 8 | 6 | 7 | 6 | 6 | 8 | 6 | 8 | 10 | 8 | 13 | 14 | 10 | 12 | 12 | 11 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 16 | WSW 14 | SW 13 | SW 13 | SSW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 13 | SW 13 | SW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 11 |
| kJ | 202 | 1001 | 4456 | 2528 | 1086 | 2431 | 1347 | 990 | 726 | 589 | 976 | 837 | 514 | 700 | 919 | 1459 | 1509 | 1049 | 680 | 556 | 419 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SE 13 | NNW 7 | SW 14 | W 13 | W 12 | — | — | — | SW 14 | SW 18 | SW 16 | SW 14 | — | — | — | — | — | SE 11 | E 10 | SW 14 |
| kJ | 192 | 7 | 51 | 849 | 987 | 319 | — | — | — | 245 | 12 | 206 | 305 | — | — | — | — | — | 5 | 2 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | WSW 14 | — | — | — | — | — | W 20 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 378 | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 6 | NW 7 | — | — | SSE 5 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | SSE 7 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 5 | SSE 5 | SSE 4 | SSE 4 |
| kJ | 331 | 740 | — | — | 93 | 97 | 226 | 280 | 218 | 196 | 412 | 278 | 260 | 320 | 208 | 173 | 138 | 64 | 19 | 20 | 24 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 277 | 191 | 139 | 325 | 174 | 13 | 53 | 177 | 53 | 1294 | 1294 | 13 | 13 | 366 | 87 | 87 | 344 | 1 | 1 | 459 | 0 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 Thermopylae 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 Thermopylae Surf forecast
The above surf forecast table for Thermopylae provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Thermopylae can be found by selecting the local surf guide option on the grey menu. Our Thermopylae 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 (Thermopylae) 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 Thermopylae 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 Cape Town? If you are looking for accommodation near Thermopylae, camping, hotels and holiday cottages in Cape Town, consider staying in Cape Town which is 8 km (5 miles) away. Other places in and around Cape Town where you can find information about places to rent, and car hire include Robben Island which is 11 km (7 miles) away, Bellville, Atlantis and Kayamnandi.
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