Surf Forecasts:
How big are the waves at Arniston today (18 Aug):
- Morning surf: Morning surf (18 Aug, local time) - 4.5ft (1.4m), 13s period with SW swell.
- Afternoon surf: Afternoon surf (18 Aug, local time) - 5ft (1.6m), 13s period with SSW swell.
- Evening surf: Evening surf (18 Aug, local time) - 6ft (1.8m), 13s period with SSW swell.
The current surf forecast for Arniston at 6AM is: 1.3m 13s primary swell from a Southwest direction and 0.6m 11s secondary swell from a East direction (forecast issued at 01:00am August 18). The wind direction is predicted to be cross-offshore and the swell rating is 3.
| Time (SAST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Aug) | 4.5ft (1.4m) | 13s |
| Afternoon (18 Aug) | 5ft (1.6m) | 13s |
| Evening (18 Aug) | 6ft (1.8m) | 13s |
Table - waves today at Arniston. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 14°C on Tue morning, min 12°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||||||||||
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 | 5 PM | 8 PM | 11 PM | |
Swell Height Map |  |  |  |  |  |  |  |  |  | |||||||||||||||
Wave Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 13 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 464 | 503 | 623 | 647 | 772 | 1030 | 1117 | 1049 | 885 | 871 | 857 | 727 | 715 | 680 | 636 | 657 | 1042 | 1831 | 2019 | 1783 | 1442 | 1116 | 905 | 787 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-on | on | on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off | off | glassy | cross-on | cross-on | on | cross-on |
High Tide | 6:20AM1.47m | 6:36PM1.56m | 6:55AM1.32m | 7:13PM1.39m | 7:44AM1.17m | 8:10PM1.23m | ||||||||||||||||||
Low Tide | 00:21AM0.40m | 12:16PM0.47m | 00:54AM0.55m | 12:47PM0.63m | 1:35AM0.69m | 1:29PM0.79m | ||||||||||||||||||
 | |  | | |  | | | | | | | | | | | | | | | | | |  | |
 | — | 7:16 | — | — | — | — | — | — | — | 7:15 | — | — | — | — | — | — | — | 7:13 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:10 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 12 | 12 | 12 | 13 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 14 | 13 | 13 |
Feels °C | 12 | 12 | 13 | 12 | 12 | 11 | 11 | 10 | 9 | 11 | 11 | 12 | 10 | 9 | 10 | 11 | 11 | 11 | 12 | 14 | 12 | 11 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSW 13 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 |
| kJ | 464 | 503 | 623 | 647 | 772 | 1030 | 1117 | 1049 | 885 | 871 | 857 | 727 | 715 | 680 | 636 | 657 | 1042 | 1831 | 2019 | 1783 | 1442 | 1116 | 905 | 787 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | E 11 | E 11 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 |
| kJ | 57 | 79 | 79 | 55 | 54 | 53 | 33 | 32 | 31 | 31 | 31 | 30 | 30 | 17 | 16 | 16 | 16 | 15 | 15 | 7 | 7 | 6 | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | E 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 4 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 76 | 103 | 0 | 76 | 156 | 135 | 83 | 76 | 76 | 81 | 0 | 0 | 103 | 103 | 0 | 0 | 0 | 76 | 76 | 76 | 83 | 183 | 81 | 81 |
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