Surf Forecasts:
Extensions surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 11AM (local time) - 6.5ft (2.0m), 12s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 8AM (local time) - 11ft (3.5m), 13s period, SW swell with 4,137 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 11AM (local time) - 6.5ft (2.0m), 12s period with WSW swell.
Best Forecast Surf Conditions for Extensions this week:
The surf forecast for Extensions over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 11AM. The primary swell is predicted to be 2.0m and 12s period with a secondary swell of 1.6m and 13s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Extensions in the next 16 days are 3.5m 13s and forecast to arrive on Thursday (Aug 20) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Thursday (Aug 20) at 11PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 18th Aug) | 6.5ft (2.0m) 12s |
| Best Surf | 11AM (Tue 18th Aug) | 6.5ft (2.0m) 12s |
| Most Powerful | 8AM (Thu 20th Aug) | 11ft (3.5m) 13s |
Table - best surf conditions forecast for Extensions over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Very mild (max 16°C on Mon morning, min 12°C on Tue night). Winds decreasing (fresh winds from the SE on Tue night, calm by Wed night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Sat afternoon, min 12°C on Thu afternoon). Winds decreasing (fresh winds from the SE on Thu night, calm by Sat morning). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | WSW 13 | WSW 13 | WSW 13 | WSW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 12 | SW 12 | WSW 11 | SSW 11 | SSW 11 | SW 11 | SW 12 | SW 13 | WSW 13 | WSW 13 | WSW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2528 | 2354 | 1766 | 1159 | 2771 | 2622 | 1978 | 1742 | 2032 | 3958 | 2877 | 1578 | 628 | 517 | 408 | 1027 | 1922 | 2241 | 1828 | 1044 | 694 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-on | cross-off | cross-off | cross-off | cross | on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | on | cross | cross-off | cross-off | cross-off |
High Tide | 6:12PM1.43m | 6:31AM1.21m | 6:47PM1.29m | 7:10AM1.10m | 7:27PM1.16m | 8:02AM0.99m | 8:29PM1.04m | 9:44AM0.92m | 10:23PM0.98m | 11:55AM0.96m | 00:07AM1.03m | 12:59PM1.06m | 1:02AM1.13m | ||||||||
Low Tide | 11:56AM0.25m | 00:31AM0.30m | 12:29PM0.37m | 1:07AM0.42m | 1:04PM0.50m | 1:53AM0.54m | 1:54PM0.62m | 3:16AM0.63m | 3:46PM0.71m | 5:32AM0.62m | 6:06PM0.66m | 6:47AM0.52m | 7:07PM0.56m | ||||||||
 |  |  |  | |  | | | | | | | | | | | | | | | | |
 | 7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:18 | — | — | 7:16 | — | — |
 | — | 6:15 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | — | 6:19 | — | — | 6:20 | — | — | 6:21 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 15 | 14 | 14 | 13 | 13 | 14 | 15 | 13 | 12 | 12 | 12 | 13 | 13 | 14 | 15 | 15 | 13 | 13 | 14 |
Feels °C | 12 | 12 | 13 | 13 | 11 | 7 | 11 | 13 | 14 | 9 | 7 | 5 | 5 | 8 | 8 | 14 | 14 | 15 | 11 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 13 | WSW 13 | WSW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 12 | SW 12 | WSW 11 | SSW 11 | SSW 11 | SW 11 | SW 12 | SW 13 | WSW 13 | WSW 13 | WSW 12 |
| kJ | 2528 | 2354 | 1766 | 1159 | 2771 | 2622 | 1978 | 1742 | 2032 | 3958 | 2877 | 1578 | 628 | 467 | 408 | 1027 | 1922 | 2241 | 1828 | 1044 | 694 |
Swell 2 Height (m) Direction Period (s) | — | WSW 16 | SW 14 | SW 13 | — | — | — | — | — | — | — | — | SSW 12 | WSW 11 | WSW 11 | SW 16 | — | — | SSW 14 | SSW 12 | SSW 11 |
| kJ | — | 211 | 304 | 837 | — | — | — | — | — | — | — | — | 503 | 517 | 352 | 40 | — | — | 73 | 475 | 508 |
Swell 3 Height (m) Direction Period (s) | — | SW 16 | E 11 | E 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 15 |
| kJ | — | 65 | 9 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 88 |
Wind waves Height (m) Direction Period (s) | NNW 3 | — | — | — | — | ESE 4 | — | — | — | — | — | SE 5 | S 11 | — | — | — | — | — | — | — | — |
| kJ | 9 | — | — | — | — | 13 | — | — | — | — | — | 42 | 617 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 35 | 3 | 3 | 0 | 26 | 12 | 5 | 1 | 0 | 12 | 400 | 30 | 27 | 34 | 12 | 1 | 1 | 26 | 26 | 26 | 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 Extensions 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 Extensions Surf forecast
The above surf forecast table for Extensions provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Extensions can be found by selecting the local surf guide option on the grey menu. Our Extensions 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 (Extensions) 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 Extensions 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 Extensions, camping, hotels and holiday cottages in Cape Town, consider staying in Cape Town which is 45 km (28 miles) away. Other places in and around Cape Town where you can find information about places to rent, and car hire include Bellville which is 51 km (32 miles) away, Grabouw, Stellenbosch and Kayamnandi.
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