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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 1 am Wednesday 20 Aug 2025 HST
How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 4AM is: 0.4m 17s primary swell from a South direction and 0.4m 12s secondary swell from a South-southwest direction (forecast issued at 01:00am August 20). An open ocean swell of 1.1m 5s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Aug) | 1.5ft (0.4m) | 16s |
| Afternoon (20 Aug) | 1.5ft (0.5m) | 16s |
| Evening (20 Aug) | 1.5ft (0.5m) | 16s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
| 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) (?) | 18 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 111 | 149 | 144 | 165 | 156 | 175 | 174 | 173 | 158 | 197 | 156 | 205 | 199 | 165 | 167 | 142 | 142 | 173 | 173 | 214 | 211 | 208 | 158 | 186 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | cross- off | off | cross- off | cross- off | off | off | cross- off | off | glass | glass | glass | cross- on | cross- on | cross- off | off | off | off | off | glass | cross- off | cross- off | off |
High Tide / height (m) | 1:53AM 0.32 | 2:31PM 0.84 | 2:40AM 0.35 | 3:11PM 0.83 | 3:23AM 0.39 | 3:48PM 0.80 | ||||||||||||||||||
Low Tide / height (m) | 9:05PM 0.12 | 6:58AM 0.02 | 9:35PM 0.10 | 7:50AM 0.02 | 10:01PM 0.09 | 8:38AM 0.03 | ||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:05 | - | - | - | - | - | - | - | 6:07 | - | - | - | - | - | - | - | 6:07 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:52 | - | - | - | - | - | - | - | 6:51 | - | - | - | - | - | - | - | 6:50 | - |
 | | |  |  | | | |  | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 25 | 25 | 24 | 26 | 27 | 27 | 27 | 25 | 25 | 24 | 25 | 25 | 27 | 27 | 27 | 27 | 25 | 25 | 25 | 26 | 27 | 28 | 28 | 26 |
| Feels °C (?) | 26 | 27 | 25 | 27 | 29 | 27 | 26 | 25 | 27 | 25 | 28 | 28 | 29 | 28 | 29 | 30 | 27 | 27 | 26 | 28 | 29 | 29 | 29 | 27 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for HAW - Maui
The wind is still cross-off at Grandma's (light winds from the N at Wailuku Heights wx 10 km from Grandma's). 0.5m 8s swell from the SE with a 0.3m 10s swell from the S and a 0.2m 16s long period groundswell, also from the S. 3 swells combining to make bigger set waves.
1 h 19 min ago
FREE! Surf-Forecast.com widget for your website
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