Surf Forecasts:
How big are the waves at Mahai'ula Bay today (18 Jul):
- Morning surf: Morning surf (18 Jul, local time) - 2ft (0.6m), 13s period with W swell.
- Afternoon surf: Afternoon surf (18 Jul, local time) - 1.5ft (0.5m), 13s period with W swell.
- Evening surf: Evening surf (18 Jul, local time) - 1.5ft (0.5m), 13s period with W swell.
The current surf forecast for Mahai'ula Bay at 8AM is: 0.6m 13s primary swell from a West direction and 0.6m 7s secondary swell from a North direction (forecast issued at 01:00am July 18). An open ocean swell of 0.8m 7s is not directed at the surf break, a second open ocean swell of 0.7m 14s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Jul) | 2ft (0.6m) | 13s |
| Afternoon (18 Jul) | 1.5ft (0.5m) | 13s |
| Evening (18 Jul) | 1.5ft (0.5m) | 13s |
Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 4mm), mostly falling on Sat night. Warm (max 28°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 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) | W 14 | W 14 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | WNW 13 | S 13 | S 18 | S 18 | S 18 | S 17 | S 17 | S 16 | WNW 12 | S 16 | S 16 | S 15 | S 15 | S 15 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 187 | 134 | 130 | 126 | 89 | 87 | 87 | 87 | 87 | 86 | 55 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 28 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | glassy | on | glassy | cross | cross-on | cross-on | cross-on | glassy | glassy | glassy | cross | cross-on | cross-on | on | glassy | glassy | glassy | cross-on | cross-on | cross | cross-on | cross-on |
High Tide | 7:09AM0.48m | 6:50PM0.67m | 8:11AM0.52m | 7:20PM0.57m | 9:19AM0.56m | 7:48PM0.48m | ||||||||||||||||||
Low Tide | 1:11AM0.09m | 12:27PM0.22m | 1:43AM0.10m | 1:31PM0.30m | 2:14AM0.11m | 2:59PM0.36m | ||||||||||||||||||
 | |  | | | |  |  |  | | | | | | | | | | |  | | | | | |
 | — | 5:54 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — |
 | — | — | — | — | — | 7:05 | — | — | — | — | — | — | — | 7:05 | — | — | — | — | — | — | — | 7:05 | — | — |
mm | — | — | — | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 28 | 27 | 27 | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 27 | 27 | 27 | 26 | 26 |
Feels °C | 30 | 30 | 30 | 31 | 31 | 30 | 29 | 28 | 29 | 29 | 30 | 30 | 29 | 26 | 28 | 28 | 29 | 28 | 29 | 29 | 29 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 5 | NNE 5 | NNE 5 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | S 16 | S 16 | S 16 | S 16 | S 15 | S 15 | S 15 |
| kJ | 40 | 40 | 51 | 61 | 75 | 66 | 53 | 51 | 51 | 34 | 40 | 31 | 42 | 33 | 33 | 32 | 32 | 260 | 412 | 502 | 489 | 441 | 429 | 424 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | S 12 | S 12 | SSW 12 | S 12 | S 13 | S 13 | S 18 | S 13 | S 17 | S 17 | NNE 5 | NNE 8 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 |
| kJ | 218 | 213 | 210 | 156 | 160 | 210 | 133 | 75 | 108 | 117 | 108 | 115 | 125 | 162 | 130 | 220 | 200 | 23 | 32 | 37 | 37 | 36 | 42 | 40 |
Swell 3 Height (m) Direction Period (s) | W 14 | W 14 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | W 13 | WNW 13 | S 19 | S 18 | SSW 13 | S 18 | S 12 | S 11 | S 14 | WNW 12 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 |
| kJ | 187 | 134 | 130 | 126 | 89 | 87 | 87 | 87 | 87 | 86 | 55 | 112 | 159 | 95 | 160 | 69 | 62 | 134 | 28 | 83 | 82 | 81 | 77 | 70 |
Wind waves Height (m) Direction Period (s) | — | — | N 7 | — | S 4 | S 3 | W 7 | NW 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 36 | — | 4 | 3 | 4 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 34 | 0 | 4 | 14 | 100 | 34 | 0 | 1 | 100 | 113 | 100 | 100 | 97 | 18 | 18 | 24 | 99 | 100 | 38 | 13 | 19 |
Best forecast wave conditions in Big Island | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
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