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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 7 am Thursday 21 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 normal for this time of year)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 3PM is: 0.5m 16s primary swell from a South direction (forecast issued at 07:00am May 21). An open ocean swell of 0.4m 7s is not directed at the surf break, a second open ocean swell of 2.3m 7s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 1.5ft (0.5m) | 16s |
| Afternoon (21 May) | 1.5ft (0.5m) | 16s |
| Evening (21 May) | 1.5ft (0.5m) | 15s |
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 Thu afternoon, min 22°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | Sun 24 | |||||||||||||||||||||
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 | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
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 | S 16 | S 16 | S 16 | S 16 | S 15 | S 15 | S 15 | S 15 | S 14 | |
147 | 146 | 86 | 131 | 79 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 103 | 102 | 91 | 134 | 132 | 132 | 129 | 165 | 159 | 157 | 109 | 153 | |
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 | 8:33AM0.23m | 8:36PM0.69m | 9:51AM0.28m | 9:31PM0.62m | 10:59AM0.35m | 10:25PM0.55m | ||||||||||||||||||
Low Tide | 3:05AM0.03m | 12:58PM0.07m | 3:55AM0.02m | 2:11PM0.13m | 4:37AM0.01m | 3:36PM0.18m | ||||||||||||||||||
 |  | | |  | | | | | | | | | | | | | | | | |  | | | |
 | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | 5:46 |
 | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:59 | — | — | — | — | — | — | — | 6:59 | — | — | 7:00 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 23 | 24 | 26 | 27 | 25 | 23 | 23 | 22 | 22 | 24 | 26 | 26 | 25 | 23 | 23 | 22 | 22 | 24 | 26 | 25 | 25 | 23 | 23 | 22 |
21 | 22 | 25 | 27 | 23 | 21 | 20 | 20 | 20 | 21 | 23 | 22 | 22 | 20 | 21 | 21 | 20 | 21 | 23 | 21 | 22 | 21 | 21 | 20 | |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | ESE 7 | S 16 | SE 7 | S 15 | S 15 | S 15 | S 15 | S 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | S 16 | S 16 | S 16 | S 16 | S 15 | S 15 | S 15 | S 15 | S 14 |
 kJ | 147 | 146 | 18 | 131 | 23 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 62 | 60 | 91 | 134 | 132 | 132 | 129 | 165 | 159 | 157 | 109 | 153 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 7 | SSW 16 | ESE 7 | SSW 15 | SE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | S 18 | NNE 6 | SSW 18 | SSW 18 | SSW 13 | SE 5 | NNE 7 | NNE 8 | SSW 13 | SE 6 | SE 6 | N 9 | NNE 9 | NNE 8 |
| kJ | 10 | 13 | 86 | 18 | 79 | 11 | 12 | 13 | 21 | 10 | 56 | 12 | 103 | 102 | 60 | 7 | 18 | 19 | 33 | 5 | 6 | 39 | 44 | 24 |
Swell 3 Height (m) Direction Period (s) | SSW 13 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | SE 6 | SE 6 | SE 5 | SE 6 | SE 6 | SSW 18 | SE 6 | NNE 6 | NNW 11 | SSW 12 | SSW 13 | SSW 13 | SE 5 | NNW 16 | NNW 16 | NW 15 | NW 14 | NW 14 |
| kJ | 34 | 7 | 8 | 7 | 6 | 6 | 9 | 9 | 7 | 9 | 6 | 61 | 10 | 8 | 11 | 14 | 34 | 34 | 4 | 25 | 25 | 56 | 54 | 51 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 7 | E 7 | ENE 2 | ENE 2 | E 6 | E 6 | ENE 2 | NNE 7 | E 6 | NNE 6 | NE 3 | ENE 7 | NNE 7 | NE 3 | ENE 3 | NNE 7 | NNE 6 | NNE 7 | ENE 3 | E 6 | E 6 |
| kJ | 303 | 395 | 465 | 509 | 466 | 1 | 1 | 260 | 204 | 1 | 15 | 123 | 13 | 2 | 38 | 21 | 2 | 1 | 16 | 15 | 29 | 1 | 188 | 164 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 12 | 12 | 13 | 4 | 14 | 134 | 123 | 12 | 12 | 12 | 13 | 12 | 136 | 123 | 12 | 12 | 12 | 12 | 13 | 345 | 12 | 12 | 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
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