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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 Saturday 18 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
24.9° C
(Which is slightly warmer than usual)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 1PM is: 0.4m 12s primary swell from a West direction and 0.4m 12s secondary swell from a South direction (forecast issued at 07:00am April 18). An open ocean swell of 0.4m 6s is not directed at the surf break, a second open ocean swell of 1.3m 6s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Apr) | 1.5ft (0.4m) | 13s |
| Afternoon (18 Apr) | 1.5ft (0.4m) | 12s |
| Evening (18 Apr) | 1.5ft (0.4m) | 12s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 18 | Sunday 19 | Monday 20 | Tue 21 | |||||||||||||||||||||
| 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) (?) | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 16 | 13 | 13 | 14 | 14 | 15 | 14 | 14 | 14 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 55 | 54 | 50 | 46 | 45 | 45 | 43 | 45 | 44 | 23 | 23 | 25 | 41 | 65 | 55 | 56 | 59 | 62 | 62 | 55 | 54 | 54 | 54 | 55 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | glass | glass | glass | cross- off | glass | cross- off | off | glass | cross | cross | cross- off | glass | glass | glass | glass | glass | glass | glass | glass | glass | glass | glass |
High Tide / height (m) | 4:23AM 0.34 | 5:18PM 0.76 | 5:08AM 0.29 | 6:09PM 0.77 | 6:01AM 0.24 | 7:05PM 0.75 | ||||||||||||||||||
Low Tide / height (m) | 10:01AM -0.09 | 11:59PM 0.06 | 10:40AM -0.08 | 1:05AM 0.07 | 11:24AM -0.05 | |||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tue 21 | |||||||||||||||||||||
| Sunrise | - | 6:05 | - | - | - | - | - | - | - | 6:03 | - | - | - | - | - | - | - | 6:03 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:45 | - | - | - |
 |  | |  | |  |  | | |  | | | | | |  | | | | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | 1 | 1 | - | - |
| Temp. °C | 23 | 25 | 25 | 25 | 26 | 24 | 23 | 23 | 22 | 23 | 25 | 26 | 25 | 24 | 24 | 24 | 23 | 24 | 25 | 25 | 25 | 24 | 24 | 23 |
| Feels °C (?) | 24 | 26 | 27 | 28 | 30 | 26 | 26 | 25 | 24 | 26 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 27 | 28 | 29 | 28 | 28 | 28 | 26 |
- 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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