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Surf Forecasts:

Thermopylae surf break

Thermopylae surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 am Wednesday 17 Sep 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
15.0° C
 (Which is slightly cooler than normal)

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 Wednesday (Sep 17) at 5AM. The primary swell is predicted to be 3.0m and 12s period with a secondary swell of 2.0m and 11s. 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 3.0m 12s and forecast to arrive on Wednesday (Sep 17) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Sunday (Sep 21) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Wed 17th Sep)10ft (3.0m) 12s
Best Surf 5AM (Wed 17th Sep)10ft (3.0m) 12s
Most Powerful 8AM (Wed 17th Sep)10ft (3.0m) 12s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 19°C on Fri afternoon, min 12°C on Wed night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Mon morning. Very mild (max 18°C on Sun afternoon, min 14°C on Sat night). Wind will be generally light.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
5
2
3
3
1
3
3
2
2
0
2
2
1
0
0
1
2
2
0
0
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
3
SSW
3
SSW
2.4
SSW
1.4
S
1.4
S
1.6
S
1.3
SSW
1.6
S
0.9
SSW
1
S
0.9
SSE
0.7
SSE
0.6
SSE
0.3
SW
1.4
SSE
1
S
1.7
S
1.1
S
0.9
WSW
1
WSW
1
SW
Period(s) (?)12121211111112101012121212127677121114
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2735227715514594426554615141662942281501092318080295118243251395
Wind
(km/h)
10
SW
20
SSW
10
S
10
S
20
S
15
SE
5
SSE
10
S
5
NE
20
NNW
10
WNW
5
SSE
0
W
15
S
20
N
5
WSW
10
SW
5
SE
15
S
30
S
20
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		crosscrosscrosscrosscross-
off		glasscrossglasscross-
on		oncross-
off		glasscrosscrossoncross-
on		glasscrosscross-
off		cross-
off
High Tide
/ height (m)
12:51PM
1.46
1:15AM
1.46
1:36PM
1.59
1:56AM
1.56
2:12PM
1.69
2:31AM
1.63
2:43PM
1.76
3:01AM
1.67
3:12PM
1.80
3:29AM
1.69
3:40PM
1.80
3:55AM
1.69
4:06PM
1.78
4:22AM
1.66
Low Tide
/ height (m)
7:12PM
0.60
7:26AM
0.54
7:55PM
0.48
8:03AM
0.46
8:30PM
0.40
8:35AM
0.40
8:59PM
0.35
9:03AM
0.36
9:26PM
0.32
9:29AM
0.35
9:51PM
0.32
9:53AM
0.36
10:15PM
0.35
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise6:43--6:41--6:41--6:39--6:37--6:35--6:35--
Sunset-6:37--6:38--6:39--6:39--6:40--6:42--6:43-
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
clear
part cloud
part cloud
clear
clear
Rain (mm)
--------------25-----
Temp. °C141413141513161919161715171816161616161615
Feels °C (?)11101011118151718131616171615121515131211
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Cape Town

  1. weather stationWind Update Continuing clean conditions at Thermopylae (calm at Observatory wx 8 km from Thermopylae). 2.9m 12s groundswell from the SSW with a 2.1m 11s groundswell from the WSW. 2 swells combining so expect closeout sets.

    46 minutes ago Thermopylae
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Actual: 46 min ago

0 km/h
N
Clean
Please reload the page to see if there are any updates.

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.

View detailed surf forecast for Thermopylae at:
surf-forecast.com

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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