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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 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 6PM is: 0.5m 14s primary swell from a South-southwest direction (forecast issued at 01:00pm May 20). An open ocean swell of 0.4m 6s 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 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. | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
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 | S 16 | S 16 | S 16 | |
116 | 111 | 105 | 71 | 92 | 102 | 147 | 146 | 86 | 131 | 79 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 103 | 102 | 91 | 134 | 132 | 132 | |
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 | 7:41PM0.75m | 8:33AM0.23m | 8:36PM0.69m | 9:51AM0.28m | 9:31PM0.62m | |||||||||||||||||||
Low Tide | 11:56AM0.00m | 3:05AM0.03m | 12:58PM0.07m | 3:55AM0.02m | 2:11PM0.13m | 4:37AM0.01m | ||||||||||||||||||
 |  | |  | | | | | | | | | | | | | | | | |  | | | | |
 | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:46 | — |
 | — | — | 6:58 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:59 | — | — | — | — | 6:59 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 26 | 27 | 26 | 24 | 23 | 23 | 23 | 24 | 26 | 27 | 25 | 24 | 23 | 22 | 22 | 23 | 26 | 26 | 25 | 23 | 23 | 22 | 22 | 24 |
27 | 27 | 25 | 23 | 22 | 22 | 21 | 23 | 25 | 27 | 23 | 22 | 20 | 20 | 20 | 20 | 22 | 22 | 22 | 20 | 22 | 20 | 20 | 22 | |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SE 6 | SSW 16 | SSW 16 | SSW 16 | ESE 6 | 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 |
 kJ | 116 | 111 | 105 | 71 | 10 | 102 | 147 | 146 | 16 | 131 | 22 | 112 | 110 | 110 | 110 | 109 | 69 | 65 | 62 | 60 | 91 | 134 | 132 | 132 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 6 | SE 6 | SE 6 | SSW 13 | SE 6 | SE 7 | NNE 7 | SSW 16 | ESE 7 | SSW 15 | SE 6 | NNE 6 | SE 6 | NNE 7 | SE 6 | NNE 6 | NNE 6 | SSW 18 | SSW 18 | SSW 13 | NNE 7 | NNE 7 | N 7 |
| kJ | 10 | 10 | 8 | 9 | 57 | 10 | 11 | 10 | 86 | 18 | 79 | 10 | 10 | 8 | 10 | 9 | 13 | 11 | 103 | 102 | 60 | 17 | 17 | 9 |
Swell 3 Height (m) Direction Period (s) | NNW 10 | NNW 10 | NNW 10 | SSW 18 | SSW 17 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | NNE 6 | SSW 12 | SSW 12 | SE 6 | SSW 12 | SE 6 | S 19 | SE 6 | SSW 18 | SE 6 | SE 6 | SE 6 | SE 5 | SSW 13 | SSW 13 |
| kJ | 20 | 10 | 11 | 60 | 92 | 34 | 34 | 33 | 33 | 8 | 14 | 14 | 10 | 14 | 5 | 27 | 10 | 61 | 5 | 9 | 9 | 5 | 34 | 34 |
Wind waves Height (m) Direction Period (s) | E 6 | E 7 | E 8 | E 6 | E 6 | E 7 | E 7 | ESE 6 | E 7 | E 7 | NE 3 | NE 6 | ENE 3 | NNE 6 | ENE 2 | NE 7 | E 6 | E 6 | NNE 6 | NNE 6 | NNE 7 | NE 3 | NE 3 | ENE 3 |
| kJ | 128 | 248 | 392 | 219 | 300 | 342 | 295 | 15 | 389 | 440 | 4 | 16 | 2 | 14 | 1 | 25 | 153 | 120 | 13 | 22 | 29 | 2 | 2 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 4 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 3731 | 14 | 123 | 12 | 12 | 12 | 12 | 141 | 136 | 13 | 12 | 12 | 12 | 13 |
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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