Surf Forecasts:
How big are the waves at Grandma's today (20 Aug):
- Morning surf: Morning surf (20 Aug, local time) - 1.5ft (0.5m), 18s period with SW swell.
- Afternoon surf: Afternoon surf (20 Aug, local time) - 1.5ft (0.5m), 18s period with SW swell.
- Evening surf: Evening surf (20 Aug, local time) - 1.5ft (0.5m), 17s period with SW swell.
The current surf forecast for Grandma's at 12PM is: 0.5m 18s primary swell from a Southwest direction and 0.3m 11s secondary swell from a South direction (forecast issued at 07:00am August 20). The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Aug) | 1.5ft (0.5m) | 18s |
| Afternoon (20 Aug) | 1.5ft (0.5m) | 18s |
| Evening (20 Aug) | 1.5ft (0.5m) | 17s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 29°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||||||||
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 | |
Swell Height Map |  |  |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SSW 17 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 16 | SSW 16 | SW 17 | SW 17 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 109 | 150 | 152 | 152 | 148 | 135 | 132 | 181 | 227 | 232 | 193 | 193 | 173 | 169 | 203 | 203 | 171 | 171 | 171 | 169 | 166 | 164 | 162 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-on | glassy | glassy | glassy | cross-off | cross-off | glassy | glassy | on | cross-on | cross-on | glassy | glassy | cross-off | cross-off | cross-off | glassy | off | off | off | off |
High Tide | 10:59AM0.65m | 10:27PM0.29m | 11:57AM0.68m | 11:47PM0.30m | 12:49PM0.72m | ||||||||||||||||||
Low Tide | 2:49AM0.09m | 6:46PM0.26m | 3:49AM0.10m | 7:40PM0.22m | 4:52AM0.09m | 8:14PM0.19m | |||||||||||||||||
 |  | | |  |  | | | | | | | | | | | | | | | | | | |
 | 6:05 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — |
 | — | — | — | — | 6:52 | — | — | — | — | — | — | — | 6:51 | — | — | — | — | — | — | — | 6:50 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 27 | 28 | 27 | 27 | 26 | 26 | 26 | 26 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 27 | 28 | 29 | 29 | 27 | 26 |
Feels °C | 28 | 30 | 30 | 32 | 31 | 31 | 29 | 30 | 30 | 30 | 32 | 31 | 32 | 32 | 31 | 30 | 29 | 29 | 32 | 31 | 31 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 16 | SSW 16 | SW 17 | SW 17 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 |
| kJ | 109 | 150 | 152 | 152 | 148 | 135 | 132 | 181 | 227 | 232 | 193 | 193 | 173 | 169 | 203 | 203 | 171 | 171 | 171 | 169 | 166 | 164 | 162 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 11 | S 11 | S 11 | S 11 | W 10 | S 11 | S 11 | S 11 | W 11 | W 11 | W 11 | W 10 | SSE 13 | S 13 | S 13 | S 14 | S 12 | S 12 | WNW 10 | WNW 11 | SE 6 |
| kJ | 44 | 41 | 21 | 20 | 21 | 21 | 19 | 21 | 21 | 21 | 37 | 37 | 35 | 32 | 57 | 54 | 90 | 98 | 47 | 47 | 35 | 38 | 11 |
Swell 3 Height (m) Direction Period (s) | NNE 6 | NNE 6 | NNE 7 | S 16 | NNE 7 | S 15 | NNE 7 | W 10 | W 10 | W 10 | S 11 | S 11 | S 11 | NE 7 | W 10 | W 10 | W 10 | WNW 10 | WNW 10 | WNW 10 | S 12 | SE 6 | WNW 11 |
| kJ | 4 | 4 | 5 | 20 | 5 | 17 | 9 | 18 | 16 | 16 | 21 | 21 | 21 | 11 | 31 | 31 | 17 | 19 | 19 | 33 | 46 | 10 | 38 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 7 | — | N 3 | — | — | — | E 4 | E 5 | E 5 | N 7 | E 6 | E 6 | E 5 | E 6 | E 6 | E 6 | E 6 | E 6 | E 6 | E 6 |
| kJ | — | — | — | 9 | — | 1 | — | — | — | 8 | 22 | 26 | 8 | 41 | 61 | 104 | 89 | 105 | 125 | 134 | 236 | 206 | 196 |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 14 | 4 | 4 | 4 | 4 | 4 | 4 | 14 | 14 | 14 | 4 | 4 | 4 | 4 | 4 | 4 | 12 | 12 | 12 | 4 |
Best forecast wave conditions in Maui | |||||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||||
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