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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 Monday 20 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
24.8° 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 11AM is: 0.4m 14s primary swell from a West direction and 0.4m 15s secondary swell from a Southwest direction (forecast issued at 07:00am April 20). The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Apr) | 1.5ft (0.4m) | 14s |
| Afternoon (20 Apr) | 1.5ft (0.4m) | 14s |
| Evening (20 Apr) | 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
Monday 20 | Tuesday 21 | Wednesday 22 | Thu 23 | |||||||||||||||||||||
| 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 | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 59 | 62 | 62 | 55 | 54 | 54 | 54 | 55 | 56 | 92 | 74 | 74 | 106 | 60 | 103 | 102 | 100 | 104 | 100 | 97 | 91 | 88 | 87 | 85 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | glass | glass | glass | glass | glass | glass | glass | on | glass | glass | off | off | off | off | off | glass | glass | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 6:01AM 0.24 | 7:05PM 0.75 | 7:10AM 0.21 | 8:07PM 0.73 | 8:38AM 0.20 | 9:11PM 0.69 | ||||||||||||||||||
Low Tide / height (m) | 11:24AM -0.05 | 2:19AM 0.08 | 12:14PM -0.01 | 3:38AM 0.08 | 1:15PM 0.04 | |||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thu 23 | |||||||||||||||||||||
| Sunrise | - | 6:03 | - | - | - | - | - | - | - | 6:03 | - | - | - | - | - | - | - | 6:01 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:46 | - | - | - | - | - | - | - | 6:46 | - | - | - |
 |  | | | |  | | | |  | | |  | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 23 | 23 | 24 | 25 | 25 | 25 | 24 | 23 | 23 |
| Feels °C (?) | 27 | 28 | 28 | 29 | 29 | 27 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 26 | 27 | 25 | 26 | 26 | 28 | 28 | 27 | 25 | 24 | 24 |
- 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.
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