Thermopylae surf break

Thermopylae surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 pm Saturday 20 Dec 2025 SAST
Forecast 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
15.8° C
(Which is 3.4°C colder than average for this time of year)
Nearby Cam: 5km away, Clifton 4th beach webcam Live Stream, Cape Town


Best Forecast Surf Conditions for Thermopylae this week:

The surf forecast for Thermopylae over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 21) at 5AM. The primary swell is predicted to be 1.8m and 12s period with a secondary swell of 0.1m and 12s. Another secondary swell of 1.6m and 7s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Thermopylae in the next 12 days are 1.9m 13s and forecast to arrive on Sunday (Dec 21) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 6s period and expected on Saturday (Dec 27) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sun 21st Dec)6ft (1.8m) 12s
Best Surf 5AM (Sun 21st Dec)6ft (1.8m) 12s
Most Powerful 2AM (Sun 21st Dec)6ft (1.9m) 13s

Table - best surf conditions forecast for Thermopylae over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 27°C on Sun afternoon, min 18°C on Sat night). Winds decreasing (fresh winds from the SSE on Sat night, light winds from the ESE by Mon morning).

Days 3-6 Weather Summary Mostly dry. Warm (max 26°C on Thu afternoon, min 18°C on Tue night). Winds decreasing (strong winds from the SSE on Wed afternoon, light winds from the SE by Fri morning).

Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sat
27
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
3
2
3
3
2
1
0
0
0
0
1
1
2
2
1
2
2
0
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.9
SW
1.1
SW
2.1
SSE
1.2
SW
1.1
SW
1.1
SW
0.9
WSW
0.9
WSW
1.6
S
1.7
S
1.9
SSW
2.5
S
2
SSE
1.1
SW
2.4
SSE
2.1
SSE
1.9
SSE
2.4
SSE
1.3
SW
1.1
SW
1.1
SW
Period(s) (?)13127111111101066888127777111111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1185349475360292258178154193225509881475349540430369495384258249
Wind
(km/h)
15
SE
10
S
20
SSE
15
SE
10
WSW
20
S
25
S
20
S
30
S
30
SSE
25
SSE
40
SSE
20
SE
15
S
25
SSE
15
SSE
10
SSW
35
SSE
35
SSE
35
SSE
45
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
crosscross-
off
cross-
off
cross-
on
crosscrosscrosscrosscross-
off
cross-
off
cross-
off
cross-
off
crosscross-
off
cross-
off
crosscross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
4:02AM
1.63
4:01PM
1.62
4:34AM
1.64
4:36PM
1.60
5:08AM
1.65
5:12PM
1.57
5:44AM
1.64
5:53PM
1.53
6:24AM
1.63
6:39PM
1.47
7:11AM
1.61
7:34PM
1.42
8:07AM
1.58
Low Tide
/ height (m)
9:42PM
0.44
9:59AM
0.60
10:14PM
0.44
10:34AM
0.59
10:46PM
0.46
11:11AM
0.60
11:21PM
0.49
11:52AM
0.61
11:59PM
0.53
12:39PM
0.63
12:43AM
0.59
1:34PM
0.65
1:36AM
0.64
2:40PM
0.66
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sat
27
Sunrise-5:31--5:31--5:31--5:33--5:33--5:33--5:35-
Sunset--7:55--7:57--7:57--7:58--7:58--7:58--7:59
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
part cloud
cloud
clear
part cloud
part cloud
Rain (mm)
---------------------
Temp. °C232527242424212122202222212426232221192122
Feels °C (?)192425222425191919171817162323202218141514
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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 12 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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