I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 am Friday 05 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
17.8° 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 Friday (Dec 12) at 8AM. The primary swell is predicted to be 0.6m and 8s 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 2.1m 12s and forecast to arrive on Sunday (Dec 07) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Thursday (Dec 11) at 8AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Fri 12th Dec)2ft (0.6m) 8s
Best Surf 8AM (Fri 12th Dec)2ft (0.6m) 8s
Most Powerful11AM (Sun 7th Dec)7ft (2.1m) 12s

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 20°C on Fri morning, min 17°C on Sat night). Mainly strong winds.

Days 3-6 Weather Summary Mostly dry. Warm (max 21°C on Tue morning, min 17°C on Wed night). Winds increasing (light winds from the SSE on Tue morning, strong winds from the SE by Wed night).

Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
1
0
1
0
0
2
1
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.9
WSW
1.7
S
1.2
SW
1.1
SW
1.4
SW
1.8
SW
2.1
SW
2.1
SW
1.8
SW
1.7
SW
1.9
SW
2.1
SW
1.9
SW
1.8
SW
1.5
SW
1.1
SW
1.3
SW
1.2
SW
1.1
SW
0.9
SW
0.9
SW
Period(s) (?)109981312121212121211111110101110999
Wave
Graph
(?)Metric surfscale
Energy kJ (?)15745921014963210361335120996080010071073850763459260375290196141123
Wind
(km/h)
25
SSE
35
SSE
40
SSE
35
SSE
45
SSE
40
SE
30
SSE
35
SSE
35
SSE
25
S
25
S
20
SSE
20
SSW
30
SSE
40
SE
30
SSE
40
SSE
35
SE
15
SE
20
SE
20
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
crosscrosscrosscrosscrosscross-
on
crosscross-
on
cross-
on
crosscross-
on
cross-
on
crosscrosscrosscrosscrosscrosscross-
on
High Tide
/ height (m)
3:20PM
1.63
3:53AM
1.54
4:08PM
1.57
4:40AM
1.52
4:55PM
1.48
5:29AM
1.47
5:45PM
1.36
6:19AM
1.40
6:37PM
1.24
7:14AM
1.33
7:36PM
1.12
8:15AM
1.26
8:46PM
1.04
Low Tide
/ height (m)
9:12AM
0.11
9:41PM
-0.02
10:00AM
0.12
10:26PM
0.03
10:50AM
0.16
11:12PM
0.11
11:41AM
0.24
11:59PM
0.21
12:37PM
0.33
12:48AM
0.32
1:39PM
0.42
1:43AM
0.42
2:50PM
0.48
2:47AM
0.50
Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Sunrise5:26--5:26--5:26--5:26--5:26--5:28--5:28--
Sunset-7:45--7:46--7:47--7:49--7:49--7:50--7:51-
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
---------------------
Temp. °C201918181918192019192020212120202019212321
Feels °C (?)171412111210141513161618201916161512192120
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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