Surf Forecasts:
How big are the waves at Grandma's today (18 Sep):
- Morning surf: Morning surf (18 Sep, local time) - 3ft (0.9m), 17s period with SSW swell.
- Afternoon surf: Afternoon surf (18 Sep, local time) - 2.5ft (0.8m), 17s period with SSW swell.
- Evening surf: Evening surf (18 Sep, local time) - 2.5ft (0.8m), 17s period with SSW swell.
The current surf forecast for Grandma's at 3PM is: 0.8m 17s primary swell from a South-southwest direction (forecast issued at 07:00am September 18). An open ocean swell of 0.2m 7s is not directed at the surf break, a second open ocean swell of 1.4m 8s is not directed at the surf break. The wind direction is predicted to be cross-shore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Sep) | 3ft (0.9m) | 17s |
| Afternoon (18 Sep) | 2.5ft (0.8m) | 17s |
| Evening (18 Sep) | 2.5ft (0.8m) | 17s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 29°C on Fri morning, min 25°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||||||||
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 18 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 14 | SW 16 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 480 | 475 | 377 | 377 | 368 | 373 | 351 | 261 | 255 | 258 | 334 | 129 | 206 | 156 | 132 | 154 | 295 | 263 | 234 | 292 | 296 | 292 | 284 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | glassy | cross | glassy | off | off | cross-off | off | off | glassy | off | off | cross-off | off | cross-off | off | off | off | cross-off | off | off | off |
High Tide | 10:11AM0.66m | 10:26PM0.30m | 11:13AM0.68m | 11:39PM0.32m | 12:07PM0.70m | ||||||||||||||||||
Low Tide | 6:00PM0.23m | 3:09AM0.15m | 6:47PM0.20m | 4:22AM0.15m | 7:19PM0.17m | ||||||||||||||||||
 |  | |  | |  | | | | | |  | | | | | | | | | | | | |
 | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | — | — | 6:25 | — | — | — | — | — | — | — | 6:24 | — | — | — | — | — | — | — | 6:23 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 29 | 29 | 29 | 27 | 26 | 26 | 26 | 27 | 28 | 29 | 28 | 27 | 26 | 26 | 25 | 26 | 28 | 29 | 28 | 26 | 25 |
Feels °C | 28 | 29 | 32 | 31 | 33 | 28 | 27 | 28 | 28 | 28 | 31 | 31 | 30 | 28 | 28 | 28 | 26 | 27 | 30 | 31 | 30 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 18 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SSW 16 | SSW 15 | SW 16 | SSW 14 | SW 16 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 |
| kJ | 480 | 475 | 377 | 377 | 368 | 373 | 351 | 261 | 255 | 258 | 334 | 123 | 206 | 156 | 124 | 154 | 295 | 263 | 234 | 292 | 296 | 292 | 284 |
Swell 2 Height (m) Direction Period (s) | SE 7 | SE 6 | ESE 7 | ESE 7 | SSW 16 | SSW 16 | ESE 7 | SSW 16 | SSW 16 | S 15 | SSE 5 | SW 16 | S 15 | SW 16 | S 16 | S 16 | ESE 6 | SW 15 | SW 15 | SE 5 | SE 6 | SW 15 | ESE 5 |
| kJ | 11 | 6 | 5 | 4 | 50 | 51 | 9 | 147 | 146 | 113 | 5 | 129 | 110 | 124 | 132 | 134 | 7 | 34 | 33 | 5 | 8 | 33 | 6 |
Swell 3 Height (m) Direction Period (s) | N 7 | NNE 7 | SSE 7 | SSW 16 | ESE 7 | ESE 7 | SSW 16 | SE 6 | ESE 7 | SSE 5 | SSW 15 | SE 6 | SE 5 | ESE 7 | SSW 13 | SSW 13 | SW 15 | NNE 7 | NNE 7 | SW 15 | SW 15 | E 10 | N 6 |
| kJ | 8 | 9 | 9 | 50 | 5 | 10 | 51 | 9 | 11 | 5 | 42 | 12 | 4 | 5 | 70 | 70 | 34 | 4 | 4 | 33 | 33 | 2 | 6 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 8 | E 8 | E 8 | E 8 | E 6 | E 6 | E 6 | E 6 | E 7 | E 8 | E 8 | E 6 | E 6 | E 9 | E 9 | E 9 | E 6 | E 6 | ENE 6 | E 6 |
| kJ | 186 | 181 | 213 | 247 | 247 | 257 | 287 | 173 | 108 | 127 | 253 | 266 | 277 | 305 | 202 | 226 | 371 | 357 | 407 | 231 | 247 | 13 | 149 |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 111 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 12 | 12 |
Best forecast wave conditions in Maui | |||||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||||
Header Global | |||||||||||||||||||||||
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