- 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 Monday 13 Apr 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
24.4° 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 8AM is: 0.6m 11s primary swell from a Northwest direction and 0.4m 12s secondary swell from a Southwest direction (forecast issued at 01:00am April 13). An open ocean swell of 0.7m 5s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Apr) | 2ft (0.6m) | 11s |
| Afternoon (13 Apr) | 2ft (0.6m) | 10s |
| Evening (13 Apr) | 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
Monday 13 | Tuesday 14 | Wednesday 15 | ||||||||||||||||||||||
| 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 | 11 AM | 2 PM | 5 PM | 8 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 11 | 11 | 11 | 11 | 14 | 14 | 14 | 13 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 97 | 96 | 96 | 96 | 73 | 72 | 62 | 99 | 101 | 53 | 129 | 127 | 125 | 123 | 162 | 155 | 153 | 148 | 107 | 103 | 103 | 141 | 141 | 72 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | off | glass | on | cross- on | glass | glass | glass | glass | glass | glass | cross- on | glass | glass | glass | glass | glass | glass | glass | glass | glass | glass | glass |
High Tide / height (m) | 1:08AM 0.59 | 1:51PM 0.45 | 1:48AM 0.56 | 2:30PM 0.53 | 2:26AM 0.52 | 3:09PM 0.61 | ||||||||||||||||||
Low Tide / height (m) | 7:31AM 0.01 | 7:19PM 0.07 | 7:57AM -0.02 | 8:14PM 0.05 | 8:25AM -0.05 | |||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:09 | - | - | - | - | - | - | - | 6:07 | - | - | - | - | - | - | - | 6:07 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:44 | - | - | - | - | - | - | - | 6:44 | - | - | - | - | - | - | - | 6:45 | - |
 |  | |  | | | |  | | | | | | | | |  | | | | | |  | | |
Rain (mm) | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | - | 1 | - |
| Temp. °C | 22 | 22 | 22 | 23 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 25 | 25 | 24 | 24 |
| Feels °C (?) | 22 | 23 | 24 | 25 | 27 | 27 | 28 | 28 | 29 | 27 | 27 | 27 | 28 | 29 | 28 | 29 | 28 | 27 | 28 | 27 | 29 | 29 | 27 | 27 |
- 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