Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Grandma's surfForecast / HAW – Maui / USA
48hr Weather and Surf, issued 1 am Tuesday 30 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
25.6° C
(Which is slightly warmer than usual)How big are the waves at Grandma's today?
The current surf forecast for Grandma's at 7AM is: 0.2m 12s primary swell from a South-southwest direction and 0.3m 6s secondary swell from a Southeast direction (forecast issued at 01:00am December 30). An open ocean swell of 1.0m 14s 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 glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (30 Dec) | 0.5ft (0.2m) | 12s |
| Afternoon (30 Dec) | 0.5ft (0.2m) | 12s |
| Evening (30 Dec) | 0.5ft (0.2m) | 18s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 30 | Wednesday 31 | Thursday 01 | ||||||||||||||||||||||
| 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) (?) | 15 | 12 | 12 | 12 | 12 | 12 | 12 | 18 | 12 | 12 | 12 | 12 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 459 | 15 | 14 | 14 | 14 | 14 | 14 | 31 | 14 | 14 | 13 | 13 | 46 | 44 | 42 | 41 | 66 | 66 | 65 | 65 | 64 | 62 | 57 | 55 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | glass | glass | glass | glass | glass | off | off | off | off | off | off | glass | off | off | off | off | off | off | cross- off | glass | off | off |
High Tide / height (m) | 1:06AM 0.73 | 12:29PM 0.29 | 1:55AM 0.81 | 1:32PM 0.26 | 2:41AM 0.87 | 2:33PM 0.24 | ||||||||||||||||||
Low Tide / height (m) | 7:58AM 0.16 | 6:10PM -0.08 | 9:02AM 0.11 | 6:57PM -0.09 | 9:54AM 0.07 | 7:46PM -0.10 | ||||||||||||||||||
Tuesday 30 | Wednesday 31 | Thursday 01 | ||||||||||||||||||||||
| Sunrise | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 5:54 | - | - | - | - | - | - | - | 5:55 | - | - | - | - | - | - | - | 5:55 | - |
 | | |  | | |  |  | | | | | | | | | |  | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 23 | 23 | 23 | 23 | 25 | 25 | 25 | 23 | 22 | 22 | 22 | 22 | 25 | 25 | 25 | 22 | 23 | 22 | 21 | 22 | 25 | 26 | 25 | 23 |
| Feels °C (?) | 24 | 24 | 25 | 25 | 28 | 27 | 28 | 24 | 22 | 23 | 23 | 22 | 25 | 26 | 25 | 22 | 23 | 22 | 20 | 22 | 25 | 26 | 25 | 23 |
- 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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