Surf Forecasts:
I and Js surf forecast from 18 Sep 2026:
- Best quality surf: Monday 21 Sep, 11PM (local time) - 3.5ft (1.1m), 11s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 11PM (local time) - 7.5ft (2.3m), 14s period, SW swell with 1,857 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 11PM (local time) - 3.5ft (1.1m), 11s period with SW swell.
Best Forecast Surf Conditions for I and Js this week:
The surf forecast for I and Js over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 21) at 11PM. The primary swell is predicted to be 1.1m and 11s period with a secondary swell of 0.8m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at I and Js in the next 16 days are 2.3m 14s and forecast to arrive on Saturday (Sep 19) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Friday (Sep 18) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 21st Sep) | 3.5ft (1.1m) 11s |
| Best Surf | 11PM (Mon 21st Sep) | 3.5ft (1.1m) 11s |
| Most Powerful | 11PM (Sat 19th Sep) | 7.5ft (2.3m) 14s |
Table - best surf conditions forecast for I and Js over the next 16 days.
Short Range ForecastMostly dry. Warm (max 21°C on Sun afternoon, min 13°C on Fri night). Winds decreasing (near gales from the SE on Fri afternoon, light winds from the ESE by Mon morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue night. Warm (max 26°C on Mon afternoon, min 15°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Fri 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | ||||||||||||||
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) | SW 13 | SW 12 | SW 12 | SW 14 | SW 13 | SW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 11 | SW 14 | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 9 | SSW 14 | SSW 13 | SW 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 961 | 811 | 448 | 1255 | 1810 | 1288 | 998 | 636 | 436 | 341 | 288 | 382 | 361 | 293 | 187 | 180 | 332 | 400 | 572 | 514 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-off |
High Tide | 7:27PM1.00m | 8:44AM0.91m | 9:34PM0.93m | 11:22AM0.95m | 11:39PM0.99m | 12:27PM1.07m | 00:34AM1.10m | 1:03PM1.21m | 1:11AM1.22m | 1:32PM1.34m | 1:44AM1.33m | 2:00PM1.47m | 2:15AM1.42m | |||||||
Low Tide | 2:01AM0.64m | 2:52PM0.73m | 4:47AM0.65m | 5:46PM0.68m | 6:12AM0.56m | 6:42PM0.56m | 6:52AM0.44m | 7:17PM0.43m | 7:23AM0.33m | 7:46PM0.30m | 7:51AM0.23m | 8:15PM0.19m | ||||||||
 |  | | | | | | | | | | |  |  |  | |  | | | | |
 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:33 | — | — |
 | 6:38 | — | — | 6:39 | — | — | 6:40 | — | — | 6:40 | — | — | 6:42 | — | — | 6:43 | — | — | 6:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — |
Temp °C | 17 | 15 | 15 | 17 | 17 | 19 | 21 | 19 | 21 | 26 | 26 | 25 | 21 | 17 | 15 | 16 | 16 | 17 | 19 | 19 |
Feels °C | 7 | 8 | 10 | 11 | 10 | 16 | 17 | 14 | 19 | 24 | 24 | 23 | 19 | 16 | 12 | 13 | 15 | 18 | 19 | 20 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 12 | SW 12 | SW 14 | SW 13 | SW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 11 | SW 11 | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 9 | SSW 14 | SSW 13 | SW 12 |
| kJ | 961 | 811 | 448 | 1255 | 1810 | 1288 | 998 | 636 | 436 | 341 | 233 | 382 | 361 | 293 | 187 | 180 | 332 | 400 | 572 | 514 |
Swell 2 Height (m) Direction Period (s) | WSW 18 | SW 16 | SW 14 | — | — | — | — | — | SW 17 | SSW 15 | SE 6 | WSW 11 | WSW 10 | SE 8 | S 9 | SSE 13 | NW 6 | SW 10 | WNW 7 | NW 6 |
| kJ | 31 | 127 | 346 | — | — | — | — | — | 76 | 154 | 56 | 117 | 82 | 11 | 14 | 34 | 34 | 84 | 18 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 14 | SE 8 | SE 8 | S 14 | SSE 13 | S 9 | S 10 | NNW 6 | NNW 6 | W 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | 288 | 28 | 18 | 4 | 18 | 6 | 8 | 13 | 3 | 6 |
Wind waves Height (m) Direction Period (s) | SE 7 | SE 7 | SE 6 | SE 7 | SE 6 | SE 6 | SE 7 | SE 6 | SE 7 | SE 7 | ESE 7 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | — | S 8 | SSE 7 | SSE 7 |
| kJ | 621 | 357 | 259 | 480 | 317 | 228 | 439 | 338 | 213 | 143 | 138 | 45 | 56 | 72 | 67 | 69 | — | 245 | 311 | 165 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 34 | 5 | 5 | 48 | 15 | 2 | 34 | 5 | 2 | 2 | 0 | 9 | 0 | 10 | 23 | 12 | 2 | 2 | 2 | 0 |
Best forecast wave conditions in Cape Town | ||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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 I and Js 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 I and Js Surf forecast
The above surf forecast table for I and Js provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at I and Js can be found by selecting the local surf guide option on the grey menu. Our I and Js 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 (I and Js) 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 I and Js 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 I and Js, camping, hotels and holiday cottages in Cape Town, consider staying in Cape Town which is 28 km (17 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 40 km (25 miles) away, Robben Island, Stellenbosch and Kayamnandi.
Nearest