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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 Tuesday 16 Sep 2025 HST
How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 8AM is: 0.4m 12s primary swell from a South-southwest direction (forecast issued at 07:00am September 16). An open ocean swell of 0.2m 9s is not directed at the surf break, a second open ocean swell of 1.0m 5s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Sep) | 1.5ft (0.4m) | 12s |
| Afternoon (16 Sep) | 1.5ft (0.4m) | 13s |
| Evening (16 Sep) | 1.5ft (0.4m) | 13s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| 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) (?) | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 37 | 59 | 50 | 55 | 56 | 55 | 27 | 51 | 65 | 64 | 61 | 57 | 57 | 57 | 56 | 55 | 54 | 51 | 51 | 51 | 51 | 50 | 48 | 69 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | cross- off | off | off | off | cross- off | off | off | glass | glass | off | off | glass | cross- off | off | cross- off | cross- on | glass | cross- off | cross- off | off | off |
High Tide / height (m) | 12:30PM 0.78 | 12:57AM 0.35 | 1:19PM 0.78 | 1:45AM 0.41 | 2:02PM 0.76 | |||||||||||||||||||
Low Tide / height (m) | 4:44AM 0.11 | 7:51PM 0.13 | 5:55AM 0.11 | 8:20PM 0.11 | 6:55AM 0.10 | 8:45PM 0.10 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| Sunrise | - | 6:13 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:28 | - | - | - | - | - | - | - | 6:27 | - | - | - | - | - | - | - | 6:25 | - | - | - |
 |  | |  |  | | | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 25 | 26 | 28 | 28 | 28 | 26 | 25 | 24 | 24 | 25 | 27 | 28 | 27 | 26 | 25 | 25 | 24 | 25 | 27 | 27 | 27 | 26 | 25 | 25 |
| Feels °C (?) | 26 | 26 | 28 | 29 | 30 | 27 | 26 | 25 | 25 | 26 | 29 | 31 | 30 | 28 | 27 | 27 | 26 | 27 | 29 | 30 | 28 | 27 | 27 | 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
Continuing clean conditions at Grandma's (calm at Wailuku Heights wx 10 km from Grandma's). 0.5m 12s groundswell from the SSW with a 0.2m 11s groundswell from the SE. 2 swells combining to make bigger set waves.
Actual: 30 min ago
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