Surf Forecasts:
How big are the waves at Mahai'ula Bay today (18 Oct):
- Afternoon surf: Afternoon surf (18 Oct, local time) - 1.5ft (0.4m), 14s period with NW swell.
- Evening surf: Evening surf (18 Oct, local time) - 1.5ft (0.4m), 13s period with NW swell.
The current surf forecast for Mahai'ula Bay at 11PM is: 0.4m 13s primary swell from a Northwest direction (forecast issued at 07:00pm October 18). An open ocean swell of 1.1m 7s is not directed at the surf break, a second open ocean swell of 0.4m 12s is not directed at the surf break, a second open ocean swell of 0.3m 5s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Oct) | - | - |
| Afternoon (18 Oct) | 1.5ft (0.4m) | 14s |
| Evening (18 Oct) | 1.5ft (0.4m) | 13s |
Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Warm (max 27°C on Sun night, min 25°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Sun 18 | Monday 19 | Tuesday 20 | |||||||||||||||||
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) | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NNE 7 | NW 5 | SW 16 | NNE 7 | SW 16 | SW 16 | WNW 3 | WNW 3 | WNW 3 | SW 15 |
Wave Graph  | |||||||||||||||||||
 kJ | 51 | 46 | 44 | 44 | 42 | 39 | 37 | 37 | 36 | 0 | 1 | 0 | 0 | 39 | 40 | 1 | 1 | 1 | 37 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | glassy | glassy | cross-off | cross-off | cross | on | cross | cross-off | cross-off | glassy | cross-off | cross-off | cross | on | cross-on | cross-off | glassy |
High Tide | 11:40PM0.30m | 11:01AM0.62m | 00:30AM0.36m | 11:51AM0.63m | |||||||||||||||
Low Tide | 6:18PM0.20m | 3:07AM0.27m | 6:40PM0.17m | 4:58AM0.27m | 6:59PM0.14m | ||||||||||||||
 |  | |  |  |  |  | | | | | | | | | | | |  | |
 | — | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — |
 | 5:58 | — | — | — | — | — | — | — | 5:57 | — | — | — | — | — | — | — | 5:57 | — | — |
mm | 1 | — | — | 1 | 1 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 25 | 26 | 26 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 27 | 26 | 27 | 26 | 25 |
Feels °C | 30 | 30 | 30 | 29 | 28 | 27 | 30 | 30 | 29 | 27 | 29 | 28 | 27 | 27 | 30 | 28 | 29 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | NNE 7 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 6 |
| kJ | 96 | 88 | 110 | 96 | 75 | 81 | 86 | 86 | 104 | 101 | 84 | 84 | 108 | 93 | 93 | 77 | 93 | 96 | 66 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 12 | S 12 | S 12 | S 12 | S 12 | S 12 | S 12 | S 12 | S 11 | SW 16 | SW 16 | S 11 | S 11 | S 11 | S 11 | SW 15 | S 11 |
| kJ | 105 | 71 | 45 | 44 | 44 | 69 | 44 | 45 | 44 | 44 | 40 | 64 | 65 | 21 | 21 | 21 | 21 | 56 | 22 |
Swell 3 Height (m) Direction Period (s) | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | SW 16 | SW 16 | S 11 | S 11 | SW 16 | SW 16 | S 4 | SSE 5 | S 11 | SW 15 |
| kJ | 51 | 46 | 44 | 44 | 42 | 39 | 37 | 37 | 36 | 61 | 63 | 21 | 21 | 39 | 40 | 1 | 4 | 21 | 37 |
Wind waves Height (m) Direction Period (s) | — | SSW 2 | S 5 | S 5 | — | — | SSW 3 | — | S 5 | S 5 | NW 5 | N 7 | — | — | NW 4 | WNW 3 | WNW 3 | WNW 3 | NW 4 |
| kJ | — | 1 | 4 | 4 | — | — | 1 | — | 2 | 2 | 1 | 52 | — | — | 1 | 1 | 1 | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 1 | 1 | 1 | 1 | 1 | 100 | 100 | 103 | 1 | 1 | 1 | 1 | 1 | 103 | 105 | 105 | 1 | 1 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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