Surf Forecasts:
How big are the waves at Thermopylae today (21 Sep):
- Morning surf: Morning surf (21 Sep, local time) - 4.5ft (1.4m), 12s period with WSW swell.
- Afternoon surf: Afternoon surf (21 Sep, local time) - 4ft (1.2m), 12s period with SW swell.
- Evening surf: Evening surf (21 Sep, local time) - 4ft (1.2m), 11s period with SW swell.
The current surf forecast for Thermopylae at 6AM is: 1.4m 12s primary swell from a West-southwest direction (forecast issued at 01:00am September 21). An open ocean swell of 1.2m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore and the swell rating is 3.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Sep) | 4.5ft (1.4m) | 12s |
| Afternoon (21 Sep) | 4ft (1.2m) | 12s |
| Evening (21 Sep) | 4ft (1.2m) | 11s |
Table - waves today at Thermopylae. (Swell directed towards the surf break)
Short Range ForecastSome drizzle, heaviest during Tue morning. Warm (max 26°C on Mon afternoon, min 14°C on Wed night). Winds increasing (light winds from the E on Mon night, fresh winds from the SSE by Wed afternoon). | ||||||||||||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 23 | ||||||||||||||||||||||
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 |  |  |  |  |  |  |  |  |  | |||||||||||||||
Wave Height (m) Direction Period (s) | WSW 12 | WSW 12 | WSW 12 | WSW 12 | WSW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SSE 7 | SSE 7 | SSE 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 636 | 545 | 536 | 472 | 464 | 380 | 360 | 314 | 314 | 308 | 342 | 374 | 335 | 367 | 435 | 384 | 371 | 293 | 287 | 191 | 134 | 455 | 487 | 358 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off | off | off | off | cross-off | cross-on | on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 11:45PM1.20m | 12:29PM1.32m | 00:43AM1.31m | 1:07PM1.44m | 1:21AM1.43m | 1:37PM1.57m | ||||||||||||||||||
Low Tide | 6:01AM0.79m | 6:43PM0.77m | 6:48AM0.68m | 7:18PM0.64m | 7:23AM0.57m | 7:48PM0.51m | ||||||||||||||||||
 | |  | | | | | |  | | |  |  | | | |  | | | | | | | | |
 | — | 6:37 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:40 | — | — | — | — | — | — | — | 6:42 | — | — | — | — | — | — | — | 6:43 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 17 | 18 | 22 | 26 | 26 | 25 | 24 | 23 | 22 | 23 | 25 | 22 | 20 | 18 | 17 | 16 | 16 | 16 | 16 | 16 | 17 | 15 | 15 |
Feels °C | 17 | 16 | 17 | 21 | 25 | 25 | 25 | 24 | 24 | 22 | 23 | 24 | 22 | 20 | 19 | 17 | 15 | 15 | 13 | 12 | 11 | 13 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 12 | WSW 12 | WSW 12 | WSW 12 | WSW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 |
| kJ | 636 | 545 | 536 | 472 | 464 | 380 | 360 | 314 | 314 | 308 | 342 | 374 | 335 | 367 | 435 | 384 | 371 | 293 | 287 | 191 | 134 | 117 | 140 | 194 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 15 | SSW 15 | SSE 6 | SW 14 | SW 14 | SW 14 | WSW 11 | WSW 11 | WSW 10 | WSW 11 | S 15 | SE 8 | S 13 | S 13 | S 12 | S 12 | W 9 | — | — | — |
| kJ | — | — | — | — | 57 | 87 | 58 | 167 | 203 | 149 | 135 | 117 | 108 | 90 | 4 | 2 | 3 | 13 | 12 | 11 | 6 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 15 | — | SSE 6 | SSE 6 | SSE 6 | SE 6 | SSE 5 | S 16 | S 15 | S 14 | S 13 | — | — | SW 15 | — | — | — | — |
| kJ | — | — | — | — | — | — | 106 | — | 35 | 23 | 17 | 9 | 6 | 5 | 4 | 4 | 14 | — | — | 9 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | SSE 6 | SE 6 | — | — | — | — | — | — | S 3 | S 3 | S 4 | S 4 | S 4 | SSE 6 | SSE 7 | SSE 7 | SSE 7 |
| kJ | 87 | 90 | 93 | 80 | 64 | 55 | 151 | 51 | 74 | — | — | — | — | — | — | 3 | 6 | 7 | 11 | 38 | 188 | 455 | 487 | 358 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 17 | 17 | 17 | 1 | 1 | 6 | 0 | 63 | 138 | 344 | 344 | 13 | 1 |
Best forecast wave conditions in Cape Town | ||||||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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