Surf Forecasts:
How big are the waves at Mahai'ula Bay today (21 Sep):
- Morning surf: Morning surf (21 Sep, local time) - 1ft (0.3m), 14s period with SW swell.
- Afternoon surf: Afternoon surf (21 Sep, local time) - 1ft (0.3m), 14s period with SW swell.
- Evening surf: Evening surf (21 Sep, local time) - 1ft (0.3m), 14s period with SW swell.
The current surf forecast for Mahai'ula Bay at 12PM is: 0.3m 14s primary swell from a Southwest direction (forecast issued at 07:00am September 21). An open ocean swell of 0.9m 6s is not directed at the surf break, a second open ocean swell of 0.9m 13s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Sep) | 1ft (0.3m) | 14s |
| Afternoon (21 Sep) | 1ft (0.3m) | 14s |
| Evening (21 Sep) | 1ft (0.3m) | 14s |
Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 3mm), mostly falling on Wed afternoon. Warm (max 28°C on Mon morning, min 26°C on Mon night). Wind will be generally light. | |||||||||||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 23 | |||||||||||||||||||||
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 12 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | S 12 | SW 19 | SW 19 | S 12 | S 13 | S 13 | S 13 | S 13 | SW 17 | W 11 | SW 16 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 11 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 28 | 0 | 57 | 57 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross | glassy | glassy | glassy | glassy | glassy | on | cross-on | cross-on | glassy | glassy | glassy | cross | cross | on | glassy | glassy | glassy | glassy |
High Tide | 12:56PM0.68m | 1:27AM0.37m | 1:31PM0.70m | 1:59AM0.44m | 2:03PM0.71m | ||||||||||||||||||
Low Tide | 5:34AM0.20m | 8:07PM0.16m | 6:35AM0.18m | 8:24PM0.14m | 7:25AM0.15m | 8:41PM0.11m | |||||||||||||||||
 |  |  | | |  | | | | | | | | | | | | | |  | | | | |
 | 6:11 | — | — | — | — | — | — | — | 6:11 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | — | — | 6:21 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:19 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 26 | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 26 | 27 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 27 | 28 | 27 | 27 | 27 | 26 |
Feels °C | 29 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 30 | 31 | 32 | 31 | 31 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | SSW 13 | SSW 13 | S 13 | S 12 | S 12 | S 12 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NE 6 | NNE 5 | S 12 | NNE 6 | NNE 6 | NNE 5 |
| kJ | 327 | 308 | 53 | 64 | 62 | 49 | 229 | 222 | 156 | 153 | 146 | 144 | 51 | 52 | 49 | 44 | 44 | 34 | 36 | 110 | 51 | 37 | 32 |
Swell 2 Height (m) Direction Period (s) | SW 14 | NNE 5 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NE 6 | S 12 | S 12 | S 13 | S 13 | S 13 | S 13 | S 13 | SW 16 | S 12 | S 12 | S 12 |
| kJ | 53 | 46 | 299 | 295 | 232 | 229 | 38 | 30 | 31 | 32 | 32 | 38 | 146 | 151 | 163 | 168 | 168 | 166 | 119 | 133 | 108 | 106 | 106 |
Swell 3 Height (m) Direction Period (s) | W 12 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 19 | SW 19 | SW 19 | SW 17 | SW 17 | SW 17 | SW 17 | SW 17 | SW 17 | W 11 | SW 16 | SW 16 | SW 16 |
| kJ | 11 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 28 | 36 | 57 | 57 | 75 | 75 | 77 | 77 | 75 | 143 | 9 | 124 | 121 | 122 |
Wind waves Height (m) Direction Period (s) | NNE 6 | — | — | — | — | — | — | — | — | — | SSE 4 | SW 3 | — | — | — | — | — | — | — | NNE 6 | — | — | — |
| kJ | 55 | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — | — | 70 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 11 | 11 | 99 | 100 | 11 | 1 | 1 | 11 | 18 | 18 | 100 | 100 | 103 | 11 | 11 | 11 | 11 | 11 | 100 | 1 | 1 | 1 | 1 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||||
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