- 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 Friday 17 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 9AM is: 0.5m 13s primary swell from a South direction and 0.4m 12s secondary swell from a Southwest direction (forecast issued at 01:00am April 17). An open ocean swell of 0.8m 5s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Apr) | 1.5ft (0.5m) | 13s |
| Afternoon (17 Apr) | 1.5ft (0.5m) | 13s |
| Evening (17 Apr) | 1.5ft (0.5m) | 13s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 17 | Saturday 18 | Sunday 19 | ||||||||||||||||||||||
| 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) (?) | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 61 | 61 | 93 | 87 | 84 | 83 | 83 | 82 | 80 | 55 | 55 | 54 | 50 | 49 | 45 | 45 | 43 | 45 | 44 | 23 | 23 | 25 | 41 | 65 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | off | off | cross- off | cross- off | cross- off | cross- off | glass | cross- off | off | cross- off | glass | cross- on | glass | glass | glass | glass | glass | off | cross- on | glass | glass | glass |
High Tide / height (m) | 3:42AM 0.41 | 4:32PM 0.73 | 4:23AM 0.34 | 5:18PM 0.76 | 5:08AM 0.29 | 6:09PM 0.77 | ||||||||||||||||||
Low Tide / height (m) | 10:03PM 0.04 | 9:26AM -0.08 | 10:59PM 0.05 | 10:01AM -0.09 | 11:59PM 0.06 | 10:40AM -0.08 | ||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:05 | - | - | - | - | - | - | - | 6:05 | - | - | - | - | - | - | - | 6:03 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:45 | - |
 |  | |  | | |  | | | | | | | | | | | | | | |  |  |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - |
| Temp. °C | 23 | 22 | 22 | 23 | 25 | 26 | 25 | 24 | 24 | 24 | 23 | 24 | 26 | 27 | 26 | 24 | 23 | 23 | 23 | 24 | 25 | 25 | 24 | 24 |
| Feels °C (?) | 24 | 23 | 23 | 24 | 27 | 27 | 27 | 27 | 28 | 26 | 23 | 26 | 29 | 29 | 30 | 27 | 26 | 27 | 26 | 27 | 27 | 28 | 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