Surf Forecasts:
How big are the waves at Grandma's today (20 Jul):
- Morning surf: Morning surf (20 Jul, local time) - 2.5ft (0.7m), 16s period with S swell.
- Afternoon surf: Afternoon surf (20 Jul, local time) - 2.5ft (0.8m), 16s period with S swell.
- Evening surf: Evening surf (20 Jul, local time) - 2.5ft (0.8m), 15s period with S swell.
The current surf forecast for Grandma's at 12AM is: 0.5m 18s primary swell from a South direction and 0.4m 12s secondary swell from a South-southwest direction (forecast issued at 07:00pm July 19). An open ocean swell of 0.9m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Jul) | 2.5ft (0.7m) | 16s |
| Afternoon (20 Jul) | 2.5ft (0.8m) | 16s |
| Evening (20 Jul) | 2.5ft (0.8m) | 15s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 3mm), mostly falling on Tue afternoon. Warm (max 28°C on Mon afternoon, min 24°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Sun 19 | Monday 20 | Tuesday 21 | |||||||||||||||||
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) | S 18 | S 18 | S 18 | S 17 | S 16 | S 16 | S 16 | S 16 | S 16 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 101 | 99 | 152 | 147 | 132 | 185 | 325 | 321 | 309 | 279 | 267 | 267 | 264 | 260 | 253 | 249 | 232 | 225 | 219 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | off | off | cross-off | glassy | glassy | glassy | off | cross-off | cross-off | off | off | glassy | off | off | off | off |
High Tide | 7:52PM0.51m | 9:40AM0.52m | 8:35PM0.43m | 10:43AM0.57m | 9:28PM0.35m | ||||||||||||||
Low Tide | 2:23AM0.03m | 3:01PM0.27m | 3:01AM0.03m | 4:50PM0.29m | |||||||||||||||
 |  | | | |  | |  | |  | | | | | |  |  |  | | |
 | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:56 | — | — | — | — | — | — |
 | 7:08 | — | — | — | — | — | — | — | 7:08 | — | — | — | — | — | — | — | 7:07 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | — |
Temp °C | 27 | 26 | 25 | 25 | 24 | 25 | 27 | 27 | 28 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 26 | 25 |
Feels °C | 28 | 26 | 26 | 26 | 25 | 26 | 30 | 30 | 31 | 27 | 28 | 26 | 27 | 28 | 30 | 30 | 29 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | S 18 | S 17 | S 16 | S 16 | S 16 | S 16 | S 16 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 |
| kJ | 50 | 48 | 152 | 147 | 132 | 185 | 325 | 321 | 309 | 279 | 267 | 267 | 264 | 260 | 253 | 249 | 232 | 225 | 219 |
Swell 2 Height (m) Direction Period (s) | S 18 | S 18 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SW 18 | SW 18 | NNE 5 | NNE 6 | SW 17 | SW 16 | SW 16 | SW 16 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 |
| kJ | 101 | 99 | 47 | 40 | 40 | 43 | 51 | 82 | 15 | 10 | 45 | 69 | 69 | 69 | 44 | 71 | 67 | 64 | 61 |
Swell 3 Height (m) Direction Period (s) | NNE 7 | NNE 6 | N 8 | N 7 | NNE 7 | NNE 7 | NNE 7 | W 11 | SW 18 | SW 18 | N 5 | SE 5 | NE 7 | NE 6 | NE 6 | NNE 7 | NNE 7 | SE 5 | SE 6 |
| kJ | 11 | 6 | 10 | 10 | 10 | 10 | 9 | 10 | 50 | 49 | 5 | 7 | 11 | 10 | 6 | 9 | 9 | 5 | 8 |
Wind waves Height (m) Direction Period (s) | E 8 | E 8 | E 5 | E 4 | — | — | E 8 | N 7 | E 4 | E 5 | E 5 | E 5 | E 5 | E 5 | E 6 | E 7 | E 5 | E 5 | E 6 |
| kJ | 258 | 252 | 40 | 19 | — | — | 113 | 16 | 12 | 27 | 62 | 71 | 46 | 76 | 61 | 113 | 86 | 78 | 101 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 12 |
Best forecast wave conditions in Maui | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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