Surf Forecasts:
Arniston surf forecast from 18 Sep 2026:
- Best quality surf: Friday 25 Sep, 8AM (local time) - 3.5ft (1.0m), 12s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 2AM (local time) - 5ft (1.5m), 14s period, SSW swell with 862 kJ wave energy.
- Next surfable swell (1★+): Tuesday 22 Sep, 5PM (local time) - 5ft (1.5m), 8s period with ESE swell.
Best Forecast Surf Conditions for Arniston this week:
The surf forecast for Arniston over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 22) at 5PM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.8m and 12s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Arniston in the next 16 days are 1.5m 14s and forecast to arrive on Sunday (Sep 20) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Friday (Sep 25) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 22nd Sep) | 5ft (1.5m) 8s |
| Best Surf | 8AM (Fri 25th Sep) | 3.5ft (1.0m) 12s |
| Most Powerful | 2AM (Sun 20th Sep) | 5ft (1.5m) 14s |
Table - best surf conditions forecast for Arniston over the next 16 days.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 14°C on Fri afternoon). Winds decreasing (strong winds from the E on Fri afternoon, light winds from the E by Sat night). | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Tue night. Warm (max 27°C on Tue afternoon, min 15°C on Wed morning). Winds decreasing (strong winds from the E on Mon afternoon, light winds from the WSW by Tue night). | |||||||||||||||||||
Fri 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 13 | E 7 | E 8 | SSW 15 | SSW 14 | SW 13 | SW 13 | SW 12 | ESE 6 | E 6 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 9 | SSW 15 | SSW 13 | SSW 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 427 | 399 | 381 | 305 | 862 | 451 | 286 | 184 | 122 | 251 | 319 | 350 | 273 | 163 | 104 | 109 | 119 | 284 | 312 | 254 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | on | on | on | cross-on | on | cross-on | cross | off | cross-off | cross | cross-off | on | on | on | cross-on |
High Tide | 7:01PM1.21m | 8:23AM1.08m | 9:36PM1.10m | 11:47AM1.14m | 11:55PM1.20m | 12:38PM1.31m | 00:42AM1.35m | 1:09PM1.48m | 1:15AM1.50m | 1:36PM1.65m | 1:45AM1.64m | 2:02PM1.81m | 2:15AM1.76m | |||||||
Low Tide | 1:34AM0.81m | 2:13PM0.93m | 5:06AM0.83m | 6:07PM0.85m | 6:25AM0.69m | 6:52PM0.70m | 6:59AM0.54m | 7:21PM0.53m | 7:26AM0.40m | 7:48PM0.37m | 7:52AM0.26m | 8:15PM0.22m | ||||||||
 |  | |  |  | | | | | |  | |  | |  |  |  |  | | | |
 | — | — | 6:33 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — |
 | 6:31 | — | — | 6:31 | — | — | 6:32 | — | — | 6:34 | — | — | 6:35 | — | — | 6:35 | — | — | 6:36 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | 3 | 13 | 5 | 6 | 1 | — | — | — |
Temp °C | 15 | 15 | 15 | 16 | 16 | 17 | 18 | 17 | 18 | 18 | 17 | 26 | 27 | 21 | 15 | 15 | 15 | 17 | 18 | 16 |
Feels °C | 8 | 9 | 10 | 13 | 13 | 15 | 15 | 15 | 15 | 13 | 14 | 26 | 25 | 19 | 13 | 13 | 15 | 14 | 15 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 12 | SSW 15 | SSW 14 | ESE 8 | SW 13 | SW 12 | SW 12 | S 16 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 9 | S 8 | SSE 7 | SSW 12 |
| kJ | 427 | 330 | 184 | 305 | 862 | 211 | 286 | 184 | 116 | 122 | 319 | 350 | 273 | 163 | 104 | 109 | 119 | 142 | 177 | 254 |
Swell 2 Height (m) Direction Period (s) | — | — | SSW 15 | SW 11 | — | SW 13 | — | — | SSW 17 | SW 12 | SSW 14 | SSW 13 | SSW 12 | SW 11 | SW 11 | SW 10 | SW 10 | SSW 15 | SSW 13 | E 9 |
| kJ | — | — | 86 | 80 | — | 451 | — | — | 59 | 66 | 160 | 189 | 153 | 99 | 71 | 53 | 47 | 284 | 312 | 36 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SSW 9 | SSW 11 | WSW 11 | — | S 10 | S 9 | S 11 | S 10 | E 9 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 28 | 79 | 90 | — | 18 | 27 | 37 | 31 | 76 | — | — |
Wind waves Height (m) Direction Period (s) | E 6 | E 7 | E 8 | E 8 | ESE 8 | — | ESE 8 | ESE 8 | ESE 6 | E 6 | — | — | W 4 | W 6 | W 6 | SW 6 | — | — | E 9 | SE 7 |
| kJ | 279 | 399 | 381 | 279 | 232 | — | 181 | 172 | 122 | 251 | — | — | 2 | 74 | 62 | 7 | — | — | 56 | 135 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 192 | 184 | 81 | 81 | 183 | 81 | 81 | 184 | 81 | 137 | 81 | 93 | 0 | 0 | 0 | 81 | 107 | 81 | 81 | 81 |
Best forecast wave conditions in Overberg | ||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||
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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 Arniston 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.
Information about the Arniston Surf forecast
The above surf forecast table for Arniston provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Arniston can be found by selecting the local surf guide option on the grey menu. Our Arniston 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 (Arniston) 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 Arniston 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 Overberg? If you are looking for accommodation near Arniston, camping, hotels and holiday cottages in Overberg, consider staying in Hermanus which is 97 km (60 miles) away.
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