- 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 Saturday 21 Mar 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
24.7° C
(Which is slightly warmer than usual)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 9AM is: 0.4m 18s primary swell from a South-southwest direction and 0.5m 12s secondary swell from a South direction, 0.8m 5s secondary swell from a South-southwest direction (forecast issued at 01:00am March 21). An open ocean swell of 0.6m 11s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Mar) | 1.5ft (0.4m) | 18s |
| Afternoon (21 Mar) | 2ft (0.6m) | 18s |
| Evening (21 Mar) | 2ft (0.6m) | 18s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 21 | Sunday 22 | Monday 23 | ||||||||||||||||||||||
| 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) (?) | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 14 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 145 | 181 | 175 | 128 | 124 | 209 | 209 | 207 | 204 | 202 | 195 | 179 | 173 | 171 | 98 | 83 | 82 | 122 | 122 | 113 | 113 | 54 | 53 | 53 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | glass | glass | glass | glass | cross- off | cross- off | off | cross- off | off | cross- off |
High Tide / height (m) | 5:22AM 0.40 | 6:26PM 0.66 | 6:03AM 0.33 | 7:24PM 0.67 | 6:55AM 0.27 | |||||||||||||||||||
Low Tide / height (m) | 11:45PM 0.08 | 11:18AM -0.05 | 12:49AM 0.11 | 11:56AM -0.04 | 2:06AM 0.14 | 12:42PM -0.02 | ||||||||||||||||||
Saturday 21 | Sunday 22 | Monday 23 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:28 | - | - | - | - | - | - | - | 6:28 | - | - | - | - | - | - | - | 6:26 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - |
 | | |  | | | | | | | | | |  | |  | | | | | | | | | |
Rain (mm) | 2 | 3 | 3 | 2 | 1 | 1 | 1 | 3 | 1 | 1 | 1 | 1 | 3 | - | 2 | - | 1 | 1 | - | - | - | 1 | 1 | 1 |
| Temp. °C | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 24 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 22 |
| Feels °C (?) | 24 | 25 | 25 | 24 | 26 | 26 | 26 | 25 | 24 | 22 | 24 | 23 | 22 | 26 | 27 | 26 | 26 | 25 | 25 | 23 | 24 | 25 | 23 | 22 |
- 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