- Forecast
- Maps
- Live
- Weather State
- Spot Information
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 Wednesday 20 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
25.6° C
(Which is slightly warmer than usual)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 6AM is: 0.6m 14s primary swell from a South-southwest direction (forecast issued at 01:00am May 20). An open ocean swell of 0.4m 5s is not directed at the surf break, a second open ocean swell of 1.6m 6s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 1.5ft (0.5m) | 14s |
| Afternoon (20 May) | 1.5ft (0.5m) | 14s |
| Evening (20 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 ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 22°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | S 16 | SSW 15 | S 15 | S 15 | S 15 | S 15 | S 15 | SSW 14 | SSW 14 | SSW 18 | SSW 18 | SSW 16 | |
158 | 158 | 160 | 116 | 111 | 105 | 71 | 92 | 102 | 147 | 146 | 86 | 131 | 79 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 103 | 102 | 91 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | |
High Tide | 7:16AM0.21m | 7:41PM0.75m | 8:33AM0.23m | 8:36PM0.69m | 9:51AM0.28m | 9:31PM0.62m | ||||||||||||||||||
Low Tide | 2:09AM0.03m | 11:56AM0.00m | 3:05AM0.03m | 12:58PM0.07m | 3:55AM0.02m | 2:11PM0.13m | ||||||||||||||||||
 | |  |  | | | | | | | | | | | | | | | | | | | | | |
 | — | 5:47 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:59 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 25 | 26 | 27 | 25 | 24 | 24 | 23 | 23 | 24 | 26 | 27 | 26 | 23 | 23 | 22 | 22 | 23 | 26 | 26 | 25 | 24 | 23 |
26 | 26 | 26 | 27 | 27 | 24 | 23 | 24 | 22 | 22 | 23 | 25 | 27 | 25 | 21 | 21 | 20 | 20 | 20 | 22 | 23 | 22 | 22 | 21 | |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | ESE 6 | S 16 | ESE 7 | S 15 | S 15 | S 15 | S 15 | S 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | NNE 7 |
 kJ | 158 | 158 | 160 | 116 | 111 | 105 | 71 | 92 | 102 | 147 | 146 | 16 | 131 | 17 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 62 | 60 | 17 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 5 | SE 6 | SE 6 | SE 6 | SE 6 | SSW 18 | SSW 13 | SE 6 | ESE 6 | ESE 6 | SSW 16 | ESE 7 | SSW 15 | SE 6 | NNE 6 | NNE 7 | NNE 7 | SE 6 | NNE 7 | SSW 18 | SSW 18 | SSW 18 | SSW 16 |
| kJ | 10 | 7 | 8 | 11 | 9 | 9 | 60 | 57 | 10 | 15 | 16 | 86 | 17 | 79 | 10 | 11 | 21 | 10 | 6 | 19 | 61 | 103 | 102 | 91 |
Swell 3 Height (m) Direction Period (s) | NNW 11 | NNW 11 | NNW 10 | NNW 10 | NNE 5 | NNE 6 | NNW 11 | NNE 8 | SSW 13 | SSW 13 | NNE 7 | SSW 13 | NNE 6 | SSW 12 | SSW 12 | SE 6 | SE 6 | SE 6 | S 19 | S 18 | SE 6 | SE 6 | SE 6 | SSW 13 |
| kJ | 11 | 22 | 20 | 20 | 6 | 6 | 11 | 7 | 34 | 34 | 11 | 33 | 7 | 14 | 14 | 10 | 8 | 5 | 27 | 56 | 5 | 8 | 5 | 60 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 6 | E 8 | E 7 | ESE 7 | ESE 7 | ENE 2 | NNE 8 | E 7 | E 7 | E 7 | NNE 5 | NE 6 | ENE 2 | E 8 | ENE 2 | NE 7 | E 6 | NNE 6 | NNE 6 | NNE 6 | E 6 |
| kJ | 165 | 139 | 191 | 226 | 583 | 286 | 32 | 25 | 1 | 12 | 342 | 342 | 389 | 6 | 16 | 1 | 400 | 1 | 25 | 127 | 13 | 15 | 22 | 244 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 12 | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 4 | 12 | 134 | 12 | 12 | 12 | 12 | 13 | 14 | 134 | 12 | 12 |
Best forecast wave conditions in Maui | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
- Map Icons:
Break
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.
Nearest