I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 pm Thursday 18 Dec 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
18.4° 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 Monday (Dec 22) at 8AM. The primary swell is predicted to be 1.1m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at I and Js in the next 12 days are 2.4m 14s and forecast to arrive on Saturday (Dec 20) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Sunday (Dec 21) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Mon 22nd Dec)3.5ft (1.1m) 11s
Best Surf 8AM (Mon 22nd Dec)3.5ft (1.1m) 11s
Most Powerful 2PM (Sat 20th Dec)8ft (2.4m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 24°C on Sun morning, min 17°C on Thu night). Winds decreasing (strong winds from the SSE on Sat afternoon, light winds from the SE by Sun morning).

Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Mon night. Warm (max 25°C on Sun afternoon, min 18°C on Tue night). Winds decreasing (strong winds from the SE on Sun night, calm by Mon night).

Thu
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
2
0
0
2
2
1
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.9
SSW
1.3
SW
1.1
SW
1.2
SW
2.1
SSW
1.9
SW
2.3
SW
1.9
SW
1.2
SW
1.4
SW
1.3
SW
1.1
SW
1.1
SW
0.9
WSW
1.4
S
1
SW
1.9
SSW
0.9
SW
1.1
SW
1.2
SW
1.3
SW
Period(s) (?)991010121214131212111111106789111112
Wave
Graph
(?)Metric surfscale
Energy kJ (?)522287241262132010422095118540052839629725817813791481144249344450
Wind
(km/h)
35
SSE
35
SSE
30
SSE
35
SSE
40
SE
40
SSE
50
SSE
40
SE
20
SE
40
SE
25
ESE
10
WNW
5
WNW
5
WSW
25
S
30
SSE
35
SE
30
SSE
35
SSE
30
SSE
25
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
crosscrosscross-
on
crosscrosscrosscrosscross-
off
crosscross-
off
cross-
on
cross-
on
oncross-
on
cross-
on
crosscrosscross-
on
crosscross-
on
High Tide
/ height (m)
2:18PM
1.35
2:50AM
1.31
2:53PM
1.38
3:23AM
1.35
3:27PM
1.39
3:57AM
1.37
4:01PM
1.39
4:31AM
1.38
4:35PM
1.37
5:06AM
1.39
5:10PM
1.33
5:42AM
1.38
5:48PM
1.28
6:21AM
1.37
Low Tide
/ height (m)
8:40PM
0.23
8:52AM
0.34
9:13PM
0.20
9:26AM
0.31
9:45PM
0.18
10:00AM
0.31
10:17PM
0.18
10:34AM
0.31
10:49PM
0.19
11:10AM
0.33
11:22PM
0.22
11:49AM
0.35
11:57PM
0.26
12:32PM
0.38
Thu
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Sunrise--5:30--5:30--5:31--5:31--5:31--5:31--5:33
Sunset7:54--7:55--7:57--7:57--7:58--7:58--7:59--
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
rain showers
rain showers
clear
part cloud
part cloud
cloud
part cloud
clear
Rain (mm)
-------------22------
Temp. °C181718191820212124252322212120202019191818
Feels °C (?)131113131214141422211822212418171515141214
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.


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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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