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Thermopylae Surf Forecast
/ Cape Town (69 surf breaks) /
Surf Forecasts:
Thermopylae surfForecast / Cape Town / South Africa
48hr Weather and Surf, issued 1 am Tuesday 16 Sep 2025 SAST
How big are the waves at Thermopylae today?
The current surf forecast for Thermopylae at 4AM is: 5.0m 13s primary swell from a Southwest direction and 1.2m 14s secondary swell from a West direction, 5.0m 12s secondary swell from a West-southwest direction (forecast issued at 01:00am September 16). The wind direction is predicted to be cross-onshore and the swell rating is 11.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Sep) | 15ft (4.5m) | 12s |
| Afternoon (16 Sep) | 13ft (4.0m) | 12s |
| Evening (16 Sep) | 8ft (2.5m) | 11s |
Table - waves today at Thermopylae. (Swell directed towards the surf break)
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| 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 | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 12 | 13 | 12 | 12 | 12 | 12 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 5957 | 7466 | 18863 | 7221 | 5584 | 4829 | 4209 | 3747 | 3553 | 3510 | 4417 | 3459 | 3343 | 3016 | 2617 | 2218 | 1981 | 1714 | 1350 | 1203 | 1107 | 866 | 869 | 935 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross | cross | glass | glass | cross- on | cross- on | cross- on | cross- on | cross- on | glass | glass | glass | glass | cross- on | cross | cross- off |
High Tide / height (m) | 10:35PM 1.29 | 11:43AM 1.33 | 12:16AM 1.36 | 12:51PM 1.46 | 1:15AM 1.46 | 1:36PM 1.59 | ||||||||||||||||||
Low Tide / height (m) | 5:22AM 0.74 | 6:10PM 0.73 | 6:37AM 0.64 | 7:12PM 0.60 | 7:26AM 0.54 | 7:55PM 0.48 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:41 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:38 | - |
 | |  |  |  | | |  |  | | | | | | |  | | | |  | | | | | |
Rain (mm) | 2 | 1 | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 16 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 14 | 15 | 14 | 14 |
| Feels °C (?) | 9 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 11 | 11 | 10 | 10 | 9 | 10 | 11 | 10 | 10 | 13 | 12 | 10 | 10 |
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Live Wave Height (m)
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Cape Town
The wind is still cross-on at Thermopylae (light winds from the WNW at Observatory wx 8 km from Thermopylae). A 4.3m groundswell from the WSW is too big for here
1 h 4 min ago
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