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Grandma's Surf Forecast
/ HAW – Maui (46 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Grandma's surfForecast / HAW – Maui / USA
48hr Weather and Surf, issued 1 pm Saturday 16 May 2026 HSTForecast update in hr min s Forecast update imminent
Grandma's surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Grandma's sea temperature is
25.2° C
(Which is normal for this time of year)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 5PM is: 0.4m 14s primary swell from a Southwest direction and 0.3m 16s secondary swell from a South-southwest direction, 0.4m 3s secondary swell from a Southwest direction (forecast issued at 01:00pm May 16). The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 May) | 1.5ft (0.5m) | 15s |
| Afternoon (16 May) | 1.5ft (0.4m) | 14s |
| Evening (16 May) | 1.5ft (0.4m) | 14s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Mon afternoon. Warm (max 27°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Sat 16 | Sunday 17 | Monday 18 | Tue 19 | |||||||||||||||||||||
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 | 2 AM | 5 AM | 8 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SW 19 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 18 | |
54 | 54 | 53 | 54 | 56 | 57 | 89 | 95 | 133 | 133 | 146 | 146 | 142 | 140 | 118 | 136 | 183 | 186 | 108 | 105 | 104 | 105 | 173 | 121 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | cross-on | cross-on | cross-off | cross-off | glassy | cross-off | cross-off | glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | off | off | off | cross-off | off | |
High Tide | 4:17PM0.83m | 4:09AM0.25m | 5:04PM0.84m | 5:03AM0.22m | 5:54PM0.84m | 6:05AM0.21m | ||||||||||||||||||
Low Tide | 8:49AM-0.11m | 11:12PM0.04m | 9:30AM-0.10m | 00:10AM0.04m | 10:15AM-0.09m | 1:09AM0.04m | ||||||||||||||||||
 | | |  |  | | |  | | |  | | |  | | |  | | | | | | | | |
 | — | — | — | — | — | — | 5:48 | — | — | — | — | — | — | — | 5:47 | — | — | — | — | — | — | — | 5:47 | — |
 | — | — | 6:55 | — | — | — | — | — | — | — | 6:57 | — | — | — | — | — | — | — | 6:57 | — | — | — | — | 6:58 |
— | — | — | 1 | — | — | — | — | — | — | 1 | — | — | — | — | — | 1 | 2 | 1 | — | — | — | — | — | |
Temp °C | 26 | 25 | 25 | 26 | 25 | 24 | 24 | 25 | 26 | 27 | 26 | 25 | 25 | 24 | 24 | 25 | 26 | 26 | 26 | 25 | 24 | 24 | 23 | 24 |
29 | 27 | 28 | 28 | 28 | 28 | 27 | 28 | 30 | 30 | 29 | 28 | 28 | 27 | 27 | 27 | 29 | 29 | 28 | 27 | 26 | 26 | 24 | 25 | |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 14 | S 7 | S 6 | S 6 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 |
 kJ | 54 | 54 | 53 | 53 | 33 | 19 | 10 | 95 | 133 | 133 | 146 | 146 | 142 | 140 | 118 | 136 | 183 | 186 | 108 | 105 | 104 | 105 | 173 | 113 |
Swell 2 Height (m) Direction Period (s) | NW 11 | NNW 11 | SSW 16 | SSE 9 | SW 14 | SSW 17 | SW 14 | S 6 | SW 14 | NNW 10 | SW 21 | SW 21 | SW 21 | ESE 6 | SE 6 | SSE 6 | SW 19 | SW 19 | SW 19 | SSW 16 | SE 6 | SSW 16 | SW 18 | SSW 18 |
| kJ | 31 | 24 | 52 | 26 | 53 | 57 | 52 | 9 | 54 | 20 | 117 | 117 | 117 | 6 | 10 | 7 | 96 | 184 | 96 | 51 | 9 | 52 | 49 | 121 |
Swell 3 Height (m) Direction Period (s) | SSE 12 | SSW 16 | NW 11 | SSW 17 | SSW 17 | SW 13 | SSW 16 | SW 15 | S 6 | S 6 | SSE 6 | SSE 6 | S 6 | S 6 | NNE 6 | SSW 20 | SSE 5 | SSE 6 | SSW 16 | SSW 19 | SSW 16 | SE 6 | ESE 6 | E 5 |
| kJ | 27 | 53 | 19 | 54 | 56 | 42 | 89 | 54 | 12 | 7 | 8 | 8 | 7 | 7 | 4 | 37 | 6 | 7 | 51 | 74 | 51 | 6 | 3 | 5 |
Wind waves Height (m) Direction Period (s) | — | S 5 | SW 3 | W 2 | — | — | E 5 | E 8 | E 8 | — | — | E 8 | E 5 | E 6 | E 6 | E 8 | E 8 | E 8 | E 8 | E 8 | E 6 | E 6 | E 6 | E 6 |
| kJ | — | 2 | 2 | 1 | — | — | 17 | 165 | 196 | — | — | 235 | 42 | 164 | 124 | 230 | 196 | 223 | 258 | 219 | 149 | 89 | 134 | 158 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 4 | 17 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
Best forecast wave conditions in Maui | ||||||||||||||||||||||||
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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