Surf Forecasts:
How big are the waves at Grandma's today (21 Jul):
- Morning surf: Morning surf (21 Jul, local time) - 2.5ft (0.8m), 14s period with S swell.
- Afternoon surf: Afternoon surf (21 Jul, local time) - 2.5ft (0.8m), 14s period with S swell.
- Evening surf: Evening surf (21 Jul, local time) - 2.5ft (0.8m), 14s period with S swell.
The current surf forecast for Grandma's at 3AM is: 0.9m 15s primary swell from a South direction and 0.4m 16s secondary swell from a Southwest direction (forecast issued at 07:00pm July 20). An open ocean swell of 1.1m 7s is not directed at the surf break. The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Jul) | 2.5ft (0.8m) | 14s |
| Afternoon (21 Jul) | 2.5ft (0.8m) | 14s |
| Evening (21 Jul) | 2.5ft (0.8m) | 14s |
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 Thu afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | |||||||||||||||||
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 16 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | SSW 24 | SSW 24 | SSW 24 | SSW 23 | SSW 22 | SSW 22 |
Wave Graph  | |||||||||||||||||||
 kJ | 309 | 279 | 267 | 339 | 264 | 260 | 253 | 249 | 232 | 232 | 219 | 215 | 212 | 222 | 218 | 217 | 309 | 278 | 366 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-off | off | off | glassy | glassy | cross-off | off | glassy | off | off | off | off | off | off | cross-off | off |
High Tide | 8:35PM0.43m | 10:43AM0.57m | 9:28PM0.35m | 11:41AM0.62m | 10:39PM0.30m | ||||||||||||||
Low Tide | 3:01PM0.27m | 3:01AM0.03m | 4:50PM0.29m | 3:43AM0.03m | 6:54PM0.26m | ||||||||||||||
 |  | | | |  | |  | |  | |  | | |  | | | | | |
 | — | — | — | — | 5:56 | — | — | — | — | — | — | — | 5:56 | — | — | — | — | — | — |
 | 7:08 | — | — | — | — | — | — | — | 7:07 | — | — | — | — | — | — | — | 7:07 | — | — |
mm | — | — | — | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 26 | 26 | 25 | 24 | 25 | 27 | 27 | 27 | 25 | 25 |
Feels °C | 28 | 28 | 29 | 29 | 27 | 28 | 31 | 30 | 29 | 29 | 29 | 28 | 26 | 26 | 28 | 27 | 27 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | S 11 | S 10 | S 13 | S 13 | S 13 |
| kJ | 309 | 279 | 267 | 339 | 264 | 260 | 253 | 249 | 232 | 232 | 219 | 215 | 212 | 126 | 79 | 78 | 157 | 157 | 112 |
Swell 2 Height (m) Direction Period (s) | NNE 5 | NNE 5 | SE 6 | SW 16 | SW 16 | SW 16 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SSW 26 | SSW 26 | S 11 | S 13 | S 13 | SSW 23 | SSW 22 | SSW 22 |
| kJ | 8 | 6 | 8 | 69 | 69 | 69 | 44 | 71 | 67 | 64 | 61 | 132 | 127 | 59 | 125 | 86 | 309 | 278 | 366 |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 17 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | SW 28 | NE 5 | SE 6 | ESE 6 | SE 6 | SSW 24 | SSW 24 | SSW 24 | SW 17 | SW 18 | SSW 17 |
| kJ | 50 | 49 | 45 | 9 | 4 | 4 | 4 | 4 | 30 | 7 | 8 | 6 | 8 | 222 | 218 | 217 | 77 | 78 | 119 |
Wind waves Height (m) Direction Period (s) | E 8 | E 5 | E 6 | E 7 | E 7 | E 7 | E 5 | — | NNE 7 | E 5 | E 6 | E 6 | E 6 | E 6 | E 5 | N 10 | NNE 6 | E 5 | E 6 |
| kJ | 133 | 80 | 139 | 127 | 103 | 121 | 71 | — | 9 | 54 | 101 | 89 | 105 | 74 | 76 | 8 | 11 | 89 | 134 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 12 | 4 | 12 | 4 | 4 | 4 | 4 | 4 | 12 | 12 | 4 |
Best forecast wave conditions in Maui | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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