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I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 pm Saturday 16 Aug 2025 SAST
Forecast update in hr  min  s Forecast update imminent
I and Js surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's I and Js sea temperature is
14.9° C
 (Which is slightly cooler than normal)

Best Forecast Surf Conditions for I and Js this week:

The surf forecast for I and Js over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 17) at 11PM. The primary swell is predicted to be 0.8m and 14s period with a secondary swell of 0.7m and 5s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at I and Js in the next 12 days are 4.5m 14s and forecast to arrive on Saturday (Aug 23) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Thursday (Aug 21) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Sun 17th Aug)2.5ft (0.8m) 14s
Best Surf 8AM (Thu 21st Aug)8ft (2.5m) 12s
Most Powerful 8PM (Sat 23rd Aug)15ft (4.5m) 14s

Table - best surf conditions forecast for I and Js over the next 12 days.

Hourly12 Days
Cape Town Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Light rain (total 5mm), mostly falling on Tue morning. Very mild (max 16°C on Sun afternoon, min 13°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Thu night. Very mild (max 15°C on Tue afternoon, min 13°C on Tue night). Winds increasing (calm on Wed night, fresh winds from the NW by Thu night).

Sat
16
Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
1
1
1
2
2
3
4
4
3
3
1
1
4
4
2
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.1
SW
1
SW
0.6
SW
0.6
SW
0.7
SW
1
SW
1.2
SW
2.5
SW
3
WSW
2.5
WSW
1.9
SW
1.7
WSW
2
WSW
2.5
SW
2.5
SW
2.3
SW
2.5
WSW
3
WSW
4.5
SW
4
SW
4
SW
Period(s) (?)121215151417161614141312121212111010121313
Wave
Graph
(?)Metric surfscale
Energy (?)374286294271390805115836503627251314019341084185320521356144419001046754255331
Wind
(km/h)
25
NW
25
N
20
N
10
NW
0
NE
15
NNW
20
NNW
20
NNW
20
N
20
NW
20
NNW
30
NNW
25
NW
10
WNW
15
N
25
NNW
35
NW
35
WNW
35
W
40
WNW
45
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		crossglasscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		crosscross-
on		cross-
off		cross-
off		crosscross-
on		cross-
on		crosscross-
on
High Tide
/ height (m)
8:41PM
1.22
9:45AM
1.04
10:21PM
1.15
11:34AM
1.07
12:00AM
1.18
12:52PM
1.19
1:09AM
1.27
1:45PM
1.32
1:58AM
1.36
2:26PM
1.43
2:39AM
1.43
3:02PM
1.53
3:14AM
1.47
Low Tide
/ height (m)
2:09PM
0.48
3:23AM
0.46
3:48PM
0.57
5:12AM
0.47
5:46PM
0.54
6:37AM
0.39
7:04PM
0.43
7:33AM
0.28
7:56PM
0.31
8:16AM
0.19
8:39PM
0.21
8:52AM
0.12
9:15PM
0.14
9:24AM
0.08
Sat
16
Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Sunrise--7:24--7:22--7:22--7:20--7:18--7:18--7:16
Sunset6:15--6:16--6:17--6:19--6:19--6:20--6:21--
clearclearclearclearclearclearclearrain showersrain showersrain showersclearclearclearlight raincloudpart cloudrain showersrain showersrain showerslight rainlight rain
Rain (mm)
-------231---1--31113
Temp. °C151514161615161614151514151415151514141314
Feels °C (?)111211141413141411121499131312118855
  • 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 I and Js (calm at Shoebury Heights wx 18 km from I and Js). 1.3m 12s groundswell from the SW with a 0.9m 5s windswell from the NW and a 0.3m 19s long period groundswell from the SW. 3 swells combining to make bigger set waves.

    2 hours 0 minutes ago I and Js
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18 km away, 2 h 0 min ago

0 km/h
NE
0.0
14.9
Air / Water (°C)
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 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.

View detailed surf forecast for I and Js at:
surf-forecast.com

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 12 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.

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