Surf Forecasts:
How big are the waves at Grandma's today (17 Sep):
- Morning surf: Morning surf (17 Sep, local time) - 2.5ft (0.7m), 16s period with SW swell.
- Afternoon surf: Afternoon surf (17 Sep, local time) - 2.5ft (0.7m), 16s period with SW swell.
- Evening surf: Evening surf (17 Sep, local time) - 2.5ft (0.7m), 16s period with SW swell.
The current surf forecast for Grandma's at 12PM is: 0.7m 16s primary swell from a Southwest direction (forecast issued at 07:00am September 17). An open ocean swell of 0.5m 7s is not directed at the surf break, a second open ocean swell of 1.4m 6s is not directed at the surf break. The wind direction is predicted to be glassy and the swell rating is 2.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | 2.5ft (0.7m) | 16s |
| Afternoon (17 Sep) | 2.5ft (0.7m) | 16s |
| Evening (17 Sep) | 2.5ft (0.7m) | 16s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 15mm), heaviest on Thu afternoon. Warm (max 29°C on Thu morning, min 25°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||
Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||||||||
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) | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SSW 16 | SSW 17 | SSW 18 | SSW 18 | SSW 17 | SW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SSW 16 | SW 16 | SW 16 | SW 15 | SW 16 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 274 | 264 | 261 | 261 | 264 | 199 | 381 | 541 | 480 | 475 | 298 | 377 | 368 | 373 | 351 | 261 | 201 | 258 | 334 | 129 | 206 | 242 | 132 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | glassy | glassy | glassy | off | off | cross-off | off | off | glassy | cross-off | off | off | off | cross-off | off | off | glassy | glassy | off | off | off |
High Tide | 9:04AM0.66m | 8:49PM0.30m | 10:11AM0.66m | 10:26PM0.30m | 11:13AM0.68m | ||||||||||||||||||
Low Tide | 4:27PM0.26m | 2:00AM0.14m | 6:00PM0.23m | 3:09AM0.15m | 6:47PM0.20m | ||||||||||||||||||
 |  | | | |  | |  | | |  | | | | | | |  | | | | | | |
 | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | — | — | 6:27 | — | — | — | — | — | — | — | 6:25 | — | — | — | — | — | — | — | 6:24 | — | — |
mm | — | 1 | 1 | 2 | 4 | 3 | 2 | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 29 | 29 | 29 | 27 | 26 | 26 | 26 | 27 | 29 | 29 | 28 | 27 | 27 | 26 | 26 | 27 | 28 | 29 | 28 | 26 | 26 |
Feels °C | 29 | 31 | 33 | 33 | 33 | 30 | 29 | 29 | 28 | 29 | 33 | 31 | 30 | 29 | 29 | 28 | 28 | 29 | 31 | 33 | 29 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SSW 16 | SSW 17 | SSW 18 | SSW 18 | SSW 17 | SW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SSW 16 | SSW 15 | SW 16 | SW 15 | SW 16 |
| kJ | 274 | 264 | 261 | 261 | 264 | 164 | 381 | 541 | 480 | 475 | 298 | 377 | 368 | 373 | 351 | 261 | 201 | 258 | 334 | 123 | 206 | 242 | 124 |
Swell 2 Height (m) Direction Period (s) | SW 11 | SW 11 | NNE 7 | NNE 7 | SE 6 | SSW 19 | N 7 | SE 6 | SE 6 | SE 6 | SSW 17 | SE 6 | SE 6 | SE 5 | ESE 7 | SSW 16 | SSW 16 | S 15 | SE 6 | SW 16 | S 15 | SSW 17 | S 16 |
| kJ | 19 | 19 | 29 | 18 | 18 | 199 | 9 | 10 | 9 | 9 | 101 | 20 | 23 | 10 | 11 | 147 | 83 | 113 | 11 | 129 | 110 | 96 | 132 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 11 | SW 20 | SE 6 | NNE 7 | NNE 7 | SE 6 | N 7 | N 7 | NNE 7 | ESE 6 | SSW 16 | SSW 16 | SSW 16 | SSE 6 | ESE 7 | ESE 6 | SE 5 | SSW 15 | SSW 18 | ESE 8 | ESE 8 | SSW 13 |
| kJ | 3 | 4 | 99 | 8 | 16 | 17 | 6 | 8 | 8 | 9 | 8 | 50 | 50 | 51 | 6 | 10 | 7 | 10 | 42 | 103 | 6 | 6 | 70 |
Wind waves Height (m) Direction Period (s) | N 7 | NNE 7 | E 6 | E 6 | E 6 | E 9 | E 6 | E 6 | E 6 | E 6 | E 6 | E 6 | E 6 | E 8 | E 8 | E 6 | E 8 | E 8 | E 6 | E 8 | E 8 | E 8 | E 8 |
| kJ | 28 | 30 | 74 | 239 | 146 | 450 | 170 | 200 | 181 | 144 | 247 | 318 | 288 | 291 | 287 | 209 | 302 | 305 | 128 | 427 | 438 | 439 | 302 |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 12 | 4 | 4 | 4 | 12 | 4 | 4 | 4 | 4 | 4 | 4 | 13 | 12 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 12 | 4 | 4 |
Best forecast wave conditions in Maui | |||||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||||
Header Global | |||||||||||||||||||||||
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