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Surf Forecasts:
Arniston surfForecast / Overberg / South Africa
48hr Weather and Surf, issued 7 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)How big are the waves at Arniston today?
The current surf forecast for Arniston at 11PM is: 1.4m 8s primary swell from a South direction and 0.6m 13s secondary swell from a Southwest direction, 1.4m 6s secondary swell from a East-southeast direction (forecast issued at 07:00pm May 18). The wind direction is predicted to be onshore.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| Afternoon (18 May) | 3ft (0.9m) | 14s |
| Evening (18 May) | 4.5ft (1.3m) | 8s |
Table - waves today at Arniston. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 5mm), mostly falling on Tue night. Warm (max 20°C on Thu afternoon, min 16°C on Mon night). Winds decreasing (strong winds from the E on Tue night, light winds from the N by Thu morning). | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SW 14 | S 8 | S 8 | SE 7 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | |
297 | 172 | 229 | 658 | 960 | 875 | 833 | 867 | 1194 | 1397 | 1331 | 1302 | 1630 | 1337 | 1476 | 1602 | 1456 | 1284 | 1313 | 1317 | 1541 | 942 | 802 | 697 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-off | |
High Tide | 4:26PM1.84m | 4:40AM1.88m | 5:14PM1.77m | 5:30AM1.73m | 6:07PM1.67m | 6:25AM1.56m | ||||||||||||||||||
Low Tide | 10:31PM0.20m | 11:01AM0.12m | 11:23PM0.30m | 11:50AM0.25m | 00:21AM0.42m | 12:45PM0.38m | ||||||||||||||||||
 |  | |  |  |  | |  | |  |  | | | | | |  | | |  | | | | | |
 | — | — | — | — | 7:28 | — | — | — | — | — | — | — | 7:28 | — | — | — | — | — | — | — | 7:28 | — | — | — |
 | 5:43 | — | — | — | — | — | — | — | 5:42 | — | — | — | — | — | — | — | 5:40 | — | — | — | — | — | — | 5:40 |
— | — | — | — | 1 | — | — | 1 | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 18 | 18 | 18 | 17 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 18 | 20 |
13 | 13 | 13 | 11 | 10 | 12 | 12 | 11 | 10 | 11 | 10 | 10 | 10 | 11 | 11 | 12 | 12 | 13 | 13 | 15 | 15 | 16 | 17 | 17 | |
Swell 1 Height (m) Direction Period (s) | SW 14 | S 8 | S 8 | SW 12 | SW 13 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SW 12 | SW 12 | SW 12 | SSW 15 | SW 14 | SSW 14 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
 kJ | 297 | 172 | 229 | 96 | 142 | 116 | 113 | 111 | 84 | 60 | 113 | 106 | 104 | 103 | 23 | 23 | 22 | 42 | 53 | 78 | 1175 | 942 | 802 | 697 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SW 14 | SW 13 | SSW 12 | SSW 12 | SSW 11 | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SW 13 | SW 13 | SW 12 | SW 12 | S 16 | SSW 15 | SSW 15 | SW 12 | SSW 14 | SW 11 | SSW 14 | SSW 13 | SW 13 | SW 13 |
| kJ | 50 | 116 | 113 | 60 | 27 | 24 | 42 | 78 | 73 | 71 | 59 | 57 | 53 | 52 | 20 | 23 | 21 | 21 | 80 | 30 | 71 | 69 | 44 | 40 |
Swell 3 Height (m) Direction Period (s) | S 12 | SSW 13 | SSW 12 | SSE 16 | SSE 16 | SSE 15 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 15 | SSW 15 | SW 14 | SW 11 | SE 11 | WSW 11 | S 22 | S 21 | SW 21 |
| kJ | 104 | 99 | 89 | 26 | 25 | 45 | 22 | 20 | 10 | 18 | 17 | 17 | 16 | 16 | 16 | 23 | 43 | 54 | 30 | 33 | 11 | 9 | 9 | 18 |
Wind waves Height (m) Direction Period (s) | ESE 5 | ESE 6 | ESE 6 | SE 7 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | — | — | — |
| kJ | 110 | 124 | 118 | 658 | 960 | 875 | 833 | 867 | 1194 | 1397 | 1331 | 1302 | 1630 | 1337 | 1476 | 1602 | 1456 | 1284 | 1313 | 1317 | 1541 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 191 | 184 | 184 | 144 | 184 | 184 | 144 | 140 | 140 | 140 | 144 | 140 | 140 | 140 | 137 | 137 | 137 | 81 | 81 | 76 | 65 | 19 | 19 | 19 |
Best forecast wave conditions in Overberg | ||||||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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