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Mahai'ula Bay Surf Forecast
/ HAW – Big Island (60 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Mahai'ula Bay surfForecast / HAW – Big Island / USA
48hr Weather and Surf, issued 1 am Thursday 21 May 2026 HSTForecast update in hr min s Forecast update imminent
Mahai'ula Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mahai'ula Bay sea temperature is
26.5° C
(Which is 1.2°C warmer than normal for this time of year)| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | - | - |
| Afternoon (21 May) | 1ft (0.3m) | 2s |
| Evening (21 May) | 1.5ft (0.5m) | 3s |
Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 23°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 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 |    |    |    | |||||||||||||||||||||
SSW 16 | S 16 | S 16 | SW 15 | WSW 2 | WNW 3 | W 3 | NNE 7 | NNE 7 | S 15 | S 14 | S 18 | S 18 | S 18 | NNE 7 | S 16 | S 16 | S 16 | S 16 | S 16 | NW 11 | S 15 | NNW 16 | NNW 15 | |
0 | 0 | 0 | 8 | 1 | 5 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 24 | 21 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | glassy | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross-off | glassy | cross-off | cross-off | cross-off | cross-on | cross | glassy | glassy | cross-off | |
High Tide | 7:56AM0.29m | 8:17PM0.76m | 9:38AM0.34m | 9:13PM0.68m | 11:07AM0.41m | 10:10PM0.62m | ||||||||||||||||||
Low Tide | 3:05AM0.14m | 12:36PM0.17m | 4:00AM0.14m | 1:55PM0.25m | 4:46AM0.13m | 3:40PM0.31m | ||||||||||||||||||
 |  |  |  | | | | | | | | | | | | | | | | | | | | | |
 | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:54 | — | — | — | — | — | — | — | 6:54 | — | — | — | — | — | — | — | 6:54 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 25 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 24 | 24 | 25 | 25 | 26 | 26 | 25 | 24 | 24 | 23 | 24 | 26 | 26 | 25 | 24 | 24 |
27 | 26 | 27 | 29 | 27 | 26 | 25 | 27 | 24 | 23 | 26 | 25 | 26 | 25 | 24 | 26 | 26 | 23 | 24 | 26 | 26 | 27 | 26 | 25 | |
Swell 1 Height (m) Direction Period (s) | NNE 6 | S 16 | S 16 | SSW 16 | NNE 6 | NNE 6 | NNE 6 | SSW 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 18 | S 17 | S 16 | NE 8 | NE 8 | NE 8 | NE 8 | S 15 | NE 9 | NNE 8 | NNE 9 |
 kJ | 70 | 134 | 132 | 201 | 140 | 107 | 126 | 169 | 157 | 155 | 150 | 101 | 97 | 150 | 137 | 190 | 49 | 62 | 49 | 49 | 218 | 75 | 287 | 238 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 13 | SSW 13 | SSE 13 | S 16 | S 15 | S 15 | SSE 5 | SSE 5 | SSE 5 | S 18 | S 18 | S 18 | S 14 | SSW 14 | SSW 13 | S 16 | S 16 | S 16 | S 15 | SSE 12 | S 15 | S 15 | S 15 |
| kJ | 203 | 57 | 56 | 33 | 124 | 161 | 159 | 5 | 5 | 5 | 102 | 98 | 154 | 93 | 61 | 58 | 190 | 188 | 183 | 109 | 13 | 212 | 212 | 209 |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSE 5 | SSE 5 | SW 15 | SSE 13 | SSE 13 | SSE 5 | SSW 12 | SSW 12 | SSE 12 | SSE 5 | SSE 5 | SSE 4 | SSE 12 | SSW 11 | SSE 12 | SSW 13 | SSW 13 | SSW 13 | S 16 | NW 11 | SSE 11 | NNW 16 | NNW 15 |
| kJ | 57 | 4 | 4 | 8 | 33 | 55 | 9 | 28 | 28 | 14 | 2 | 2 | 2 | 28 | 12 | 14 | 58 | 57 | 57 | 131 | 4 | 12 | 24 | 21 |
Wind waves Height (m) Direction Period (s) | — | NNE 6 | NNE 6 | NNE 6 | WSW 2 | WNW 3 | W 3 | NNE 7 | NNE 7 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 7 | — | S 11 |
| kJ | — | 109 | 137 | 122 | 1 | 5 | 5 | 186 | 186 | 160 | 118 | 96 | 115 | 181 | 192 | 140 | 72 | 59 | 72 | 72 | 160 | 154 | — | 61 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 1 | 1 | 1 | 1 | 103 | 18 | 11 | 1 | 1 | 11 | 1 | 444 | 447 | 11 | 1 | 1 | 18 | 18 | 18 | 453 | 15 | 1 | 1 | 1 |
Best forecast wave conditions in Big Island | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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