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Surf Forecasts:
Grandma's surfForecast / HAW – Maui / USA
48hr Weather and Surf, issued 1 am Tuesday 09 Dec 2025 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
25.9° C
(Which is slightly warmer than usual)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 5AM is: 0.4m 14s primary swell from a Northwest direction (forecast issued at 01:00am December 09). An open ocean swell of 0.2m 10s is not directed at the surf break, a second open ocean swell of 0.8m 5s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (09 Dec) | 1.5ft (0.5m) | 14s |
| Afternoon (09 Dec) | 2ft (0.6m) | 14s |
| Evening (09 Dec) | 2.5ft (0.8m) | 14s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 09 | Wednesday 10 | Thursday 11 | ||||||||||||||||||||||
| 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) (?) | 16 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 16 | 16 | 16 | 16 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 39 | 37 | 74 | 73 | 100 | 123 | 149 | 218 | 268 | 187 | 527 | 502 | 25 | 25 | 407 | 401 | 390 | 299 | 249 | 245 | 241 | 238 | 234 | 216 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | glass | glass | glass | on | glass | glass | off | glass | cross | cross- on | cross- on | on | on | on | on | on | on | on | on | on | on | on | glass |
High Tide / height (m) | 7:37AM 0.74 | 8:40PM 0.29 | 8:26AM 0.66 | 9:53PM 0.35 | 9:15AM 0.59 | |||||||||||||||||||
Low Tide / height (m) | 11:59PM 0.07 | 2:55PM 0.06 | 1:00AM 0.14 | 3:35PM 0.06 | 2:14AM 0.20 | 4:11PM 0.05 | ||||||||||||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:50 | - | - | - | - | - | - | - | 6:50 | - | - | - | - | - | - | - | 6:52 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 5:45 | - | - | - | - | - | - | - | 5:45 | - | - | - | - | - | - | - | 5:45 | - |
 |  | |  |  | | | | | | |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 23 | 23 | 23 | 23 | 25 | 25 | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 25 | 24 | 23 |
| Feels °C (?) | 24 | 25 | 25 | 25 | 26 | 27 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 23 | 23 | 23 | 24 | 25 | 25 | 25 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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