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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 am Monday 18 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
25.3° 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 9AM is: 0.6m 14s primary swell from a South-southwest direction (forecast issued at 01:00am May 18). An open ocean swell of 0.3m 8s is not directed at the surf break, a second open ocean swell of 1.7m 8s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 2ft (0.6m) | 14s |
| Afternoon (18 May) | 1.5ft (0.4m) | 19s |
| Evening (18 May) | 1.5ft (0.5m) | 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 3mm), mostly falling on Mon afternoon. Warm (max 27°C on Mon morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | ||||||||||||||||||||||
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 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SW 19 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 18 | SSW 18 | SSW 15 | SSW 17 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | |
140 | 118 | 136 | 183 | 186 | 108 | 105 | 104 | 105 | 170 | 121 | 121 | 121 | 264 | 169 | 174 | 158 | 158 | 160 | 116 | 111 | 105 | 104 | 92 | |
Wind (km/h) | ||||||||||||||||||||||||
off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | glassy | cross-off | off | off | off | off | off | off | off | off | off | off | off | |
High Tide | 5:03AM0.22m | 5:54PM0.84m | 6:05AM0.21m | 6:47PM0.80m | 7:16AM0.21m | 7:41PM0.75m | ||||||||||||||||||
Low Tide | 00:10AM0.04m | 10:15AM-0.09m | 1:09AM0.04m | 11:03AM-0.05m | 2:09AM0.03m | 11:56AM0.00m | ||||||||||||||||||
 | |  |  |  | | | | | | | | | | | | | | | | | | | | |
 | — | 5:47 | — | — | — | — | — | — | — | 5:47 | — | — | — | — | — | — | — | 5:47 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:57 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:58 | — | — |
— | — | — | — | 1 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 25 | 27 | 26 | 26 | 25 | 24 | 24 | 24 | 25 | 26 | 26 | 26 | 24 | 24 | 24 | 23 | 24 | 26 | 27 | 26 | 24 | 24 |
27 | 27 | 28 | 30 | 28 | 28 | 27 | 26 | 26 | 27 | 27 | 29 | 28 | 28 | 25 | 25 | 25 | 24 | 24 | 27 | 28 | 26 | 24 | 24 | |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 17 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 |
 kJ | 140 | 118 | 136 | 183 | 186 | 108 | 105 | 104 | 105 | 170 | 113 | 115 | 121 | 264 | 169 | 174 | 158 | 158 | 160 | 116 | 111 | 105 | 104 | 57 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | S 6 | ESE 8 | SW 19 | SW 19 | SW 19 | SE 6 | SE 6 | SSW 16 | SW 18 | SSW 18 | SSW 18 | SW 18 | NNW 11 | ESE 6 | SE 6 | SE 6 | SE 5 | NNW 10 | SE 6 | SE 6 | SE 6 | SE 6 | SSW 17 |
| kJ | 8 | 7 | 13 | 96 | 184 | 96 | 11 | 9 | 52 | 49 | 121 | 121 | 80 | 13 | 7 | 10 | 9 | 7 | 20 | 9 | 9 | 9 | 10 | 92 |
Swell 3 Height (m) Direction Period (s) | ESE 6 | ESE 6 | S 6 | ESE 8 | ESE 6 | SE 6 | SSW 16 | SSW 16 | SE 5 | SSE 10 | E 6 | NNW 11 | NNW 11 | SSE 10 | NNE 6 | NNW 11 | NNW 11 | NNW 11 | NNE 5 | NNE 6 | NNE 5 | NNE 6 | SSW 18 | NNW 11 |
| kJ | 8 | 4 | 3 | 13 | 7 | 9 | 51 | 51 | 4 | 9 | 6 | 24 | 12 | 10 | 7 | 11 | 11 | 22 | 3 | 3 | 6 | 6 | 60 | 11 |
Wind waves Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 6 | E 6 | E 6 | E 6 | E 8 | E 5 | E 6 | E 8 | E 8 | E 5 | E 6 | E 6 | E 6 | E 8 | E 8 | E 6 | E 6 | E 6 | E 6 | E 7 |
| kJ | 428 | 381 | 381 | 338 | 206 | 263 | 292 | 157 | 304 | 57 | 133 | 297 | 223 | 159 | 222 | 173 | 149 | 235 | 230 | 226 | 233 | 355 | 291 | 31 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 12 | 4 | 12 | 4 | 4 | 4 | 12 | 4 | 4 | 13 | 12 | 12 |
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)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Grandma's surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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