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Surf Forecasts:

I and Js surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 am Wednesday 17 Sep 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
15.9° C
 (Which is normal 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 Friday (Sep 19) at 11AM. The primary swell is predicted to be 1.3m and 12s period with a secondary swell of 1.0m and 12s. Another secondary swell of 1.1m and 6s is also forecast. 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 3.0m 12s and forecast to arrive on Wednesday (Sep 17) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 6s period and expected on Sunday (Sep 21) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Fri 19th Sep)4.5ft (1.3m) 12s
Best Surf11AM (Fri 19th Sep)4.5ft (1.3m) 12s
Most Powerful 8AM (Wed 17th Sep)10ft (3.0m) 12s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 18°C on Fri afternoon, min 12°C on Thu night). Winds increasing (light winds from the SSW on Wed morning, fresh winds from the SE by Thu night).

Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Mon morning. Very mild (max 17°C on Sun afternoon, min 15°C on Sat morning). Winds increasing (calm on Sat night, fresh winds from the SW by Mon morning).

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
5
2
3
3
0
1
3
0
1
0
0
1
0
0
0
0
2
1
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
3
SSW
3
SSW
2.5
SSW
1.6
S
1.8
S
1.7
S
1.3
SSW
1.1
SSW
0.9
SSW
0.7
SW
0.6
SSW
0.6
SSW
0.9
SE
1.9
SE
0.4
SW
0.4
SW
0.6
SW
1.5
SSW
0.9
WSW
1
WSW
1.3
SW
Period(s) (?)121212111112121010998461211136121114
Wave
Graph
(?)Metric surfscale
Energy kJ (?)304123911643621797792422246148835245292433632108165243247667
Wind
(km/h)
10
SW
15
SSW
10
SSW
15
S
20
SSE
30
SE
10
ESE
20
SE
10
ESE
25
NNW
10
WNW
10
S
10
SE
20
SE
20
NNE
10
SW
10
SW
10
SE
20
S
30
SSE
30
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
onononcross-
on		cross-
on		crosscross-
off		crosscross-
off		cross-
off		cross-
on		cross-
on		crosscrossoffononcrosscross-
on		crosscross
High Tide
/ height (m)
12:48PM
1.23
1:07AM
1.25
1:32PM
1.36
1:48AM
1.34
2:06PM
1.47
2:22AM
1.41
2:37PM
1.55
2:52AM
1.46
3:05PM
1.59
3:21AM
1.48
3:32PM
1.60
3:48AM
1.47
3:58PM
1.58
4:15AM
1.44
Low Tide
/ height (m)
7:06PM
0.39
7:21AM
0.30
7:48PM
0.27
7:57AM
0.21
8:22PM
0.18
8:28AM
0.15
8:53PM
0.11
8:57AM
0.11
9:20PM
0.08
9:24AM
0.11
9:47PM
0.07
9:50AM
0.13
10:13PM
0.10
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise6:43--6:41--6:41--6:39--6:37--6:37--6:35--
Sunset-6:38--6:38--6:39--6:40--6:40--6:42--6:43-
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
clear
clear
part cloud
clear
clear
Rain (mm)
--------------25-----
Temp. °C131313141414141818151616161716151616151515
Feels °C (?)11991111911151511151715151291515141110
  • 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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Eyeball surf reportRecent Eyeball Surf Reports for Cape Town

  1. weather stationWind Update Wind reports 2 km away suggest it is still onshore at I and Js (light winds from the SSW at Slangkop). 3.3m 12s groundswell from the SSW with a 2.1m 11s groundswell from the WSW. 2 swells combining so expect closeout sets.

    1 hour 26 minutes ago I and Js
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1 h 26 min ago

13 km/h
SSW
Onshore
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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