I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 am Saturday 13 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
17.2° C
(Which is 1.9°C colder than average for this time of year)


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 Tuesday (Dec 16) at 2AM. The primary swell is predicted to be 2.5m and 13s period with a secondary swell of 0.1m and 16s. 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 (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 2.5m 12s period and expected on Thursday (Dec 18) at 11PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Tue 16th Dec)8ft (2.5m) 13s
Best Surf 2AM (Tue 16th Dec)8ft (2.5m) 13s
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 Some drizzle, heaviest during Sat morning. Warm (max 20°C on Mon afternoon, min 16°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Some drizzle, heaviest during Tue night. Very mild (max 19°C on Tue afternoon, min 16°C on Wed afternoon). Winds increasing (light winds from the W on Tue night, strong winds from the SE by Thu night).

Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
4
3
3
3
2
2
3
2
4
1
2
3
0
0
0
1
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
4
SW
3.5
SW
3
SW
2.5
SW
2.4
SW
2.5
SW
3
SW
3
SW
2.5
SW
2.4
WSW
2.5
WSW
3.5
WSW
3.5
WSW
2.5
WSW
2.2
S
2
S
1
WSW
0.9
WSW
0.7
SW
0.8
SW
0.9
SW
Period(s) (?)131312121211121213121512121210121111131312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)538443232735177514991725241424952145166130752968358519359801079273198176202232
Wind
(km/h)
15
SW
20
SW
10
SSE
15
SSW
15
S
15
SSE
10
S
20
SSW
5
WNW
40
NNW
35
NNW
20
WSW
30
SW
25
SSW
25
S
30
SE
40
SSE
40
SE
40
SE
50
SE
40
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcrosscross-
on
cross-
on
crosscross-
on
cross-
on
glasscross-
off
cross-
off
onononcross-
on
crosscrosscrosscrosscrosscross-
off
High Tide
/ height (m)
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
2:18PM
1.35
2:50AM
1.31
2:53PM
1.38
3:23AM
1.35
Low Tide
/ height (m)
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
8:17AM
0.38
8:40PM
0.23
8:52AM
0.34
9:13PM
0.20
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sunrise5:28--5:28--5:28--5:28--5:28--5:30--5:30--
Sunset-7:52--7:52--7:53--7:53--7:54--7:54--7:55-
rain showers
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
Rain (mm)
1----------1---------
Temp. °C171717171818192020181919171717171717191918
Feels °C (?)1213131415161818191413161211111110912108
  • 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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