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Surf Forecasts:
Arniston surfForecast / Overberg / South Africa
16 Day Weather and Surf, issued 1 pm Monday 18 May 2026 SASTForecast update in hr min s Forecast update imminent
Arniston surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Arniston sea temperature is
17.1° C
(Which is normal for this time of year)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 Thursday (May 21) at 5AM. The primary swell is predicted to be 3.0m and 9s period with a secondary swell of 3.0m and 9s. Another secondary swell of 0.4m and 14s is also forecast. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Arniston in the next 16 days are 3.5m 8s and forecast to arrive on Tuesday (May 19) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (May 21) at 11PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 21st May) | 10ft (3.0m) 9s |
| Best Surf | 5AM (Thu 21st May) | 10ft (3.0m) 9s |
| Most Powerful | 8PM (Tue 19th May) | 11ft (3.5m) 8s |
Table - best surf conditions forecast for Arniston over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 9mm), mostly falling on Tue night. Very mild (max 18°C on Mon afternoon, min 16°C on Tue afternoon). Winds decreasing (strong winds from the ESE on Tue afternoon, light winds from the NW by Thu morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Thu afternoon, min 15°C on Sat night). Winds decreasing (fresh winds from the WSW on Fri afternoon, calm by Sun morning). | ||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SW 14 | SE 7 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | SSW 16 | SW 15 | SW 13 | SSW 13 | SW 14 | SSW 16 | SW 16 | SW 14 | SW 15 | |
297 | 658 | 693 | 1109 | 1413 | 1252 | 1252 | 1437 | 802 | 579 | 320 | 176 | 226 | 217 | 178 | 209 | 251 | 177 | 371 | 667 | 795 | |
Wind (km/h) | |||||||||||||||||||||
on | on | on | on | cross-on | cross-on | cross-on | cross-on | off | cross-off | off | off | cross-off | cross-off | glassy | cross-on | cross-on | glassy | cross-off | off | cross-on | |
High Tide | 4:26PM1.84m | 4:40AM1.88m | 5:14PM1.77m | 5:30AM1.73m | 6:07PM1.67m | 6:25AM1.56m | 7:07PM1.57m | 7:30AM1.40m | 8:20PM1.50m | 8:52AM1.30m | 9:39PM1.48m | 10:20AM1.27m | 10:51PM1.51m | 11:32AM1.32m | |||||||
Low Tide | 10:31PM0.20m | 11:01AM0.12m | 11:23PM0.30m | 11:50AM0.25m | 00:21AM0.42m | 12:45PM0.38m | 1:30AM0.54m | 1:49PM0.51m | 2:54AM0.61m | 3:05PM0.59m | 4:21AM0.60m | 4:24PM0.61m | 5:33AM0.54m | ||||||||
 |  | |  | | | |  |  | |  | | | |  | | | | |  |  | |
 | — | — | 7:28 | — | — | 7:28 | — | — | 7:28 | — | — | 7:30 | — | — | 7:31 | — | — | 7:31 | — | — | 7:31 |
 | 5:43 | — | — | 5:42 | — | — | 5:40 | — | — | 5:40 | — | — | 5:39 | — | — | 5:39 | — | — | 5:38 | — | 5:38 |
— | 1 | — | 1 | 4 | 2 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | |
Temp °C | 18 | 18 | 17 | 17 | 18 | 17 | 18 | 17 | 18 | 20 | 17 | 18 | 20 | 17 | 17 | 18 | 17 | 16 | 17 | 16 | 16 |
14 | 13 | 13 | 11 | 12 | 11 | 12 | 13 | 18 | 18 | 15 | 16 | 16 | 14 | 18 | 18 | 17 | 16 | 16 | 14 | 15 | |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 12 | SW 13 | SW 13 | SSE 13 | SW 12 | SW 12 | SSW 14 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | SW 15 | SW 13 | SSW 13 | SW 14 | SSW 16 | SW 16 | SW 14 | SW 15 |
 kJ | 297 | 96 | 111 | 108 | 106 | 23 | 22 | 78 | 802 | 579 | 320 | 176 | 144 | 217 | 178 | 209 | 251 | 177 | 371 | 667 | 795 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SSW 12 | SSE 15 | SSE 14 | SW 13 | S 16 | SSW 15 | SW 11 | SW 13 | SSW 12 | SW 18 | SSW 17 | SSW 16 | E 8 | SSE 6 | SSE 6 | E 11 | SW 13 | ESE 11 | SE 11 | E 10 |
| kJ | 50 | 60 | 42 | 73 | 57 | 20 | 21 | 30 | 44 | 58 | 84 | 111 | 226 | 60 | 25 | 28 | 62 | 108 | 38 | 30 | 18 |
Swell 3 Height (m) Direction Period (s) | S 12 | SSE 16 | SSW 11 | SSW 10 | SSW 9 | SSW 9 | SSW 15 | SE 12 | SE 11 | SSW 20 | SW 12 | SW 11 | SSE 10 | S 6 | E 8 | E 7 | SSE 6 | E 11 | SSE 11 | E 10 | SE 11 |
| kJ | 104 | 26 | 11 | 10 | 16 | 16 | 43 | 34 | 5 | 38 | 35 | 32 | 18 | 23 | 29 | 16 | 12 | 59 | 49 | 35 | 29 |
Wind waves Height (m) Direction Period (s) | ESE 5 | SE 7 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | — | SW 3 | W 2 | W 3 | WSW 3 | — | — | — | — | — | — | — | — |
| kJ | 97 | 658 | 693 | 1109 | 1413 | 1252 | 1252 | 1437 | — | 2 | 1 | 4 | 3 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 191 | 184 | 144 | 184 | 140 | 137 | 81 | 76 | 19 | 19 | 0 | 0 | 105 | 0 | 0 | 107 | 76 | 0 | 0 | 0 | 81 |
Best forecast wave conditions in Overberg | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 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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