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Surf Forecasts:
Arniston surfForecast / Overberg / South Africa
48hr Weather and Surf, issued 7 am 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 11AM is: 0.9m 15s primary swell from a Southwest direction and 0.7m 13s secondary swell from a South-southeast direction, 0.9m 6s secondary swell from a East-southeast direction (forecast issued at 07:00am May 18). The wind direction is predicted to be onshore.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 2.5ft (0.8m) | 14s |
| 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 ForecastModerate rain (total 14mm), heaviest on Tue night. Very mild (max 18°C on Mon morning, min 16°C on Tue afternoon). Winds decreasing (strong winds from the ESE on Tue afternoon, light winds from the NNE by Wed night). | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 | 5 PM | 8 PM | 11 PM | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SW 13 | SW 14 | SW 15 | SW 15 | SW 14 | S 8 | S 8 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | |
176 | 228 | 326 | 309 | 297 | 176 | 233 | 640 | 773 | 650 | 648 | 912 | 1141 | 1516 | 1479 | 1331 | 1363 | 1312 | 1252 | 1103 | 1129 | 1107 | 1406 | 1121 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | |
High Tide | 4:26PM1.84m | 4:40AM1.88m | 5:14PM1.77m | 5:30AM1.73m | 6:07PM1.67m | |||||||||||||||||||
Low Tide | 10:14AM0.02m | 10:31PM0.20m | 11:01AM0.12m | 11:23PM0.30m | 11:50AM0.25m | 00:21AM0.42m | ||||||||||||||||||
 |  |  | | |  | | |  | | | |  |  |  | | |  | |  | | | | | |
 | 7:26 | — | — | — | — | — | — | — | 7:28 | — | — | — | — | — | — | — | 7:28 | — | — | — | — | — | — | 7:28 |
 | — | — | — | — | 5:43 | — | — | — | — | — | — | — | 5:42 | — | — | — | — | — | — | — | 5:40 | — | — | 5:40 |
— | — | — | — | — | — | — | — | — | — | — | — | 2 | 5 | 1 | — | — | 4 | 1 | — | — | — | 1 | — | |
Temp °C | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 18 | 18 | 16 | 17 | 18 | 18 | 17 | 17 | 18 | 18 | 18 | 18 | 17 | 17 |
17 | 17 | 14 | 14 | 13 | 13 | 13 | 11 | 12 | 13 | 13 | 13 | 9 | 11 | 12 | 12 | 12 | 11 | 13 | 12 | 12 | 15 | 14 | 15 | |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 14 | SW 15 | SW 15 | SW 14 | S 8 | S 8 | SW 12 | SW 14 | 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 | ESE 9 |
 kJ | 176 | 228 | 326 | 309 | 297 | 176 | 233 | 96 | 114 | 114 | 111 | 109 | 108 | 60 | 111 | 108 | 104 | 94 | 37 | 23 | 22 | 42 | 53 | 1121 |
Swell 2 Height (m) Direction Period (s) | S 10 | E 6 | SSE 13 | S 13 | 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 | SSW 16 | SSW 15 | SSW 15 | SW 12 | SW 11 | SSW 14 |
| kJ | 98 | 31 | 173 | 115 | 50 | 116 | 113 | 60 | 27 | 24 | 42 | 78 | 71 | 71 | 59 | 56 | 53 | 52 | 25 | 23 | 21 | 21 | 30 | 39 |
Swell 3 Height (m) Direction Period (s) | ESE 6 | S 10 | S 13 | S 12 | S 12 | SSW 13 | SSW 12 | SSE 16 | SSE 16 | SSE 15 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 15 | — | SSW 14 | SSE 12 | SW 11 |
| kJ | 43 | 77 | 85 | 148 | 104 | 99 | 89 | 26 | 25 | 45 | 22 | 11 | 10 | 18 | 17 | 16 | 16 | 16 | 16 | 58 | — | 82 | 52 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | ESE 6 | ESE 5 | ESE 5 | ESE 6 | ESE 6 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | — |
| kJ | — | — | 67 | 67 | 94 | 104 | 114 | 640 | 773 | 650 | 648 | 912 | 1141 | 1516 | 1479 | 1331 | 1363 | 1312 | 1252 | 1103 | 1129 | 1107 | 1406 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 81 | 81 | 81 | 144 | 191 | 184 | 184 | 184 | 191 | 184 | 140 | 140 | 184 | 191 | 140 | 140 | 81 | 81 | 137 | 107 | 81 | 81 | 81 | 76 |
Best forecast wave conditions in Overberg | ||||||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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