I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 am Thursday 11 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
17.6° C
(Which is 1.4°C colder than average for this time of year)


Best Forecast Surf Conditions for I and Js this week:

The most powerful waves expected at I and Js in the next 12 days are 4.5m 14s and forecast to arrive on Saturday (Dec 13) at 5AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Dec 12) at 8AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Sat 13th Dec)15ft (4.5m) 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 Light rain (total 7mm), mostly falling on Fri afternoon. Warm (max 20°C on Thu morning, min 16°C on Fri night). Winds increasing (calm on Thu morning, strong winds from the NNW by Fri morning).

Days 3-6 Weather Summary Some drizzle, heaviest during Tue night. Warm (max 21°C on Mon afternoon, min 16°C on Sun morning). Wind will be generally light.

Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
0
2
1
0
0
5
3
3
3
2
4
3
0
2
3
0
3
3
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.2
SW
1.2
SW
0.7
SW
1.6
SW
2
SW
4.5
SW
4
SW
4
SW
3
SW
2.5
SW
2.4
SW
2.5
SW
3
SW
3
SW
2.5
SW
2.4
WSW
2.4
WSW
3.5
WSW
4
WSW
3
WSW
2.4
SSW
Period(s) (?)9919171614131312121211121212121412121212
Wave
Graph
(?)Metric surfscale
Energy kJ (?)258247376145319837729589945522968190215251570237525362044165222853826446224751543
Wind
(km/h)
10
W
20
SSW
20
NNW
40
NNW
30
W
25
WSW
15
WSW
20
SW
10
SSE
15
S
20
SSW
10
S
15
SSW
20
SSW
20
SSE
15
W
20
WNW
25
N
15
WSW
25
SSW
40
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
oncross-
off
cross-
off
cross-
on
onononcrosscross-
on
oncross-
on
cross-
on
cross-
on
crosscross-
on
cross-
on
cross-
off
oncross-
on
cross-
on
High Tide
/ height (m)
8:15AM
1.26
8:46PM
1.04
9:21AM
1.21
10:05PM
1.01
10:28AM
1.20
11:18PM
1.03
11:27AM
1.20
12:15AM
1.08
12:18PM
1.23
1:01AM
1.15
1:01PM
1.27
1:40AM
1.21
1:41PM
1.31
2:15AM
1.27
Low Tide
/ height (m)
2:50PM
0.48
2:47AM
0.50
4:06PM
0.50
4:00AM
0.55
5:14PM
0.47
5:12AM
0.56
6:09PM
0.43
6:11AM
0.53
6:53PM
0.37
6:59AM
0.48
7:32PM
0.32
7:40AM
0.43
8:07PM
0.27
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Sunrise5:28--5:28--5:28--5:28--5:28--5:28--5:28--
Sunset-7:51--7:52--7:52--7:52--7:53--7:53--7:54-
clear
part cloud
cloud
rain showers
rain showers
rain showers
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
light rain
rain showers
Rain (mm)
---142-----------1321
Temp. °C202020181918171717171819202121212119181818
Feels °C (?)191920121313131313141518191920201918171313
  • 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

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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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