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I and Js surfForecast / Cape Town / South Africa
48hr Weather and Surf, issued 7 am Wednesday 17 Sep 2025 SAST
How big are the waves at I and Js today?
The current surf forecast for I and Js at 10AM is: 3.0m 12s primary swell from a South-southwest direction and 1.8m 11s secondary swell from a West-southwest direction (forecast issued at 07:00am September 17). The wind direction is predicted to be glassy and the swell rating is 5.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | 10ft (3.0m) | 12s |
| Afternoon (17 Sep) | 10ft (3.0m) | 12s |
| Evening (17 Sep) | 8ft (2.5m) | 12s |
Table - waves today at I and Js. (Swell directed towards the surf break)
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| 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 | 2 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 10 | 10 | 11 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 3091 | 3333 | 3041 | 2770 | 2391 | 2197 | 2013 | 1643 | 1230 | 807 | 621 | 610 | 797 | 898 | 789 | 895 | 800 | 800 | 350 | 370 | 320 | 256 | 183 | 151 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | on | on | cross- on | cross- on | cross- on | on | cross- on | cross- on | cross- on | cross- on | cross | cross | cross- off | cross- off | cross- off | cross- off | cross | cross | cross | cross- off | cross- off |
High Tide / height (m) | 12:48PM 1.23 | 1:07AM 1.25 | 1:32PM 1.36 | 1:48AM 1.34 | 2:06PM 1.47 | |||||||||||||||||||
Low Tide / height (m) | 6:34AM 0.41 | 7:06PM 0.39 | 7:21AM 0.30 | 7:48PM 0.27 | 7:57AM 0.21 | 8:22PM 0.18 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| Sunrise | - | 6:43 | - | - | - | - | - | - | - | 6:41 | - | - | - | - | - | - | - | 6:41 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:38 | - | - | - | - | - | - | - | 6:38 | - | - | - | - | - | - | - | 6:39 | - | - | - |
 |  |  | |  |  | |  | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 17 | 18 | 18 | 17 | 17 |
| Feels °C (?) | 9 | 10 | 10 | 9 | 9 | 10 | 10 | 10 | 10 | 11 | 11 | 10 | 9 | 8 | 6 | 8 | 9 | 9 | 11 | 14 | 15 | 15 | 15 | 16 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Cape Town
Wind reports 2 km away suggest it is still onshore at I and Js (light winds from the SSW at Slangkop). 3.2m 12s groundswell from the SSW with a 1.7m 11s groundswell from the WSW. 2 swells combining so expect closeout sets.
2 h 25 min ago
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