Surf Forecasts:
How big are the waves at Mahai'ula Bay today (21 Oct):
- Morning surf: Morning surf (21 Oct, local time) - 1ft (0.3m), 16s period with SW swell.
- Afternoon surf: Afternoon surf (21 Oct, local time) - 0.5ft (0.2m), 3s period with WNW swell.
The current surf forecast for Mahai'ula Bay at 4AM is: 0.3m 16s primary swell from a Southwest direction (forecast issued at 01:00am October 21). An open ocean swell of 0.8m 7s 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 (21 Oct) | 1ft (0.3m) | 16s |
| Afternoon (21 Oct) | 0.5ft (0.2m) | 3s |
| Evening (21 Oct) | - | - |
Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Warm (max 27°C on Fri afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 21 | Thursday 22 | Friday 23 | ||||||||||||||||||||||
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 16 | SW 16 | SW 16 | SW 15 | WNW 3 | SW 15 | SW 15 | SW 15 | SW 15 | SW 3 | SW 3 | SW 14 | SW 14 | SSW 14 | SW 13 | SW 13 | SW 13 | SSW 13 | SW 13 | SW 13 | S 15 | SSW 15 | SSW 16 | S 16 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 40 | 39 | 39 | 37 | 1 | 0 | 0 | 0 | 33 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | cross-on | cross-on | glassy | cross | cross-on | glassy | glassy | glassy | cross-on | cross-on | cross-on | glassy | glassy | glassy | cross | cross | on | on | glassy | cross-off | glassy |
High Tide | 1:04AM0.45m | 12:33PM0.62m | 1:35AM0.54m | 1:11PM0.61m | 2:07AM0.63m | 1:47PM0.58m | ||||||||||||||||||
Low Tide | 6:14AM0.25m | 7:18PM0.11m | 7:13AM0.23m | 7:39PM0.08m | 8:06AM0.20m | 8:01PM0.05m | ||||||||||||||||||
 |  |  | |  | | |  | | |  | | | | | | | | | | | | | | |
 | — | 6:20 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:55 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:54 | — | — |
mm | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 24 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 27 | 27 | 26 | 26 |
Feels °C | 28 | 28 | 27 | 28 | 28 | 29 | 29 | 27 | 28 | 27 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 27 | 27 | 28 | 29 | 30 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NE 7 | NE 7 | NE 7 | NNE 7 | NNE 7 | NNE 5 | NNE 8 | NE 8 | NNE 8 | NNE 8 | NNE 8 | SSW 15 | SSW 16 | S 16 |
| kJ | 79 | 70 | 50 | 50 | 56 | 68 | 66 | 66 | 48 | 37 | 27 | 26 | 26 | 35 | 36 | 9 | 43 | 17 | 43 | 42 | 41 | 184 | 196 | 137 |
Swell 2 Height (m) Direction Period (s) | S 13 | SSE 5 | SSE 5 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 14 | SW 13 | SW 13 | SW 13 | SSW 13 | SSW 17 | SW 13 | S 15 | NE 8 | NNE 8 | NNE 4 |
| kJ | 29 | 5 | 5 | 37 | 56 | 54 | 54 | 54 | 33 | 54 | 53 | 51 | 49 | 71 | 46 | 45 | 44 | 69 | 59 | 42 | 116 | 16 | 41 | 7 |
Swell 3 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SSE 4 | S 4 | S 12 | S 11 | S 11 | S 11 | S 11 | S 11 | SSE 4 | S 5 | SSE 11 | SSE 10 | NE 8 | SSW 16 | NNE 4 | SW 13 | NE 13 | SW 13 | NE 12 | NE 12 | SSW 14 |
| kJ | 40 | 39 | 39 | 4 | 1 | 11 | 10 | 10 | 9 | 9 | 9 | 2 | 5 | 22 | 21 | 16 | 53 | 4 | 43 | 42 | 41 | 37 | 35 | 63 |
Wind waves Height (m) Direction Period (s) | NW 4 | — | WNW 2 | WNW 2 | WNW 3 | — | S 4 | SSW 3 | SSW 3 | SW 3 | SW 3 | — | — | — | — | — | — | — | — | — | — | NNE 4 | — | — |
| kJ | 1 | — | 1 | 1 | 1 | — | 1 | 3 | 4 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | 7 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 1 | 1 | 1 | 1 | 1 | 99 | 1 | 100 | 38 | 38 | 19 | 19 | 18 | 99 | 105 | 100 | 23 | 18 | 11 | 19 | 19 | 99 | 99 | 1 |
Best forecast wave conditions in Big Island | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
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