Surf Forecasts:
How big are the waves at Grandma's today (20 Sep):
- Morning surf: Morning surf (20 Sep, local time) - 2.5ft (0.7m), 16s period with SSW swell.
- Afternoon surf: Afternoon surf (20 Sep, local time) - 2.5ft (0.8m), 15s period with SSW swell.
- Evening surf: Evening surf (20 Sep, local time) - 2.5ft (0.8m), 15s period with SSW swell.
The current surf forecast for Grandma's at 5PM is: 0.8m 15s primary swell from a South-southwest direction (forecast issued at 01:00pm September 20). An open ocean swell of 0.4m 6s is not directed at the surf break, a second open ocean swell of 1.8m 6s is not directed at the surf break. The wind direction is predicted to be offshore and the swell rating is 2.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Sep) | 2.5ft (0.7m) | 16s |
| Afternoon (20 Sep) | 2.5ft (0.8m) | 15s |
| Evening (20 Sep) | 2.5ft (0.8m) | 15s |
Table - waves today at Grandma's. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 29°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light. | |||||||||||||||||||||
Sun 20 | Monday 21 | Tuesday 22 | |||||||||||||||||||
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 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 13 | S 13 | S 13 | S 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 234 | 292 | 296 | 292 | 284 | 269 | 265 | 207 | 195 | 187 | 184 | 171 | 168 | 125 | 121 | 119 | 113 | 110 | 108 | 106 | 110 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | cross-off | off | off | off | off | off | cross-off | cross-off | off | off | cross-off | off | off | glassy | cross-off | off | off | off |
High Tide | 12:07PM0.70m | 00:35AM0.36m | 12:53PM0.72m | 1:20AM0.41m | 1:33PM0.72m | ||||||||||||||||
Low Tide | 7:19PM0.17m | 5:28AM0.14m | 7:45PM0.14m | 6:26AM0.12m | 8:09PM0.12m | ||||||||||||||||
 | |  |  | | |  | | | | | | | | | | | | | | | |
 | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | 6:23 | — | — | — | — | — | — | — | 6:22 | — | — | — | — | — | — | — | 6:22 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 28 | 26 | 25 | 25 | 24 | 26 | 29 | 28 | 27 | 26 | 26 | 25 | 25 | 26 | 28 | 29 | 28 | 27 | 26 |
Feels °C | 30 | 30 | 29 | 27 | 26 | 25 | 24 | 27 | 31 | 29 | 28 | 27 | 28 | 27 | 27 | 28 | 32 | 32 | 30 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 13 | S 13 | S 13 | S 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 12 |
| kJ | 234 | 292 | 296 | 292 | 284 | 269 | 265 | 207 | 195 | 187 | 184 | 171 | 168 | 125 | 121 | 119 | 113 | 110 | 108 | 106 | 110 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SE 7 | SE 6 | SE 6 | SE 7 | SE 7 | SE 6 | SW 14 | SW 14 | NNE 6 | SW 14 | NNE 3 | SE 6 | SE 6 | NNE 6 | NNE 5 | NNW 12 | NNW 12 | NNW 12 | SE 6 | NNW 11 |
| kJ | 33 | 14 | 9 | 8 | 11 | 11 | 8 | 33 | 32 | 6 | 31 | 3 | 9 | 5 | 6 | 6 | 30 | 48 | 46 | 9 | 40 |
Swell 3 Height (m) Direction Period (s) | ESE 6 | SW 15 | SW 15 | SW 15 | SW 15 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | SW 14 | ESE 9 | SW 14 | NNE 6 | NNE 6 | SE 5 | N 13 | NNE 5 | SE 6 | SE 6 | NNW 11 | SE 6 |
| kJ | 4 | 33 | 33 | 33 | 33 | 7 | 7 | 7 | 6 | 31 | 8 | 31 | 6 | 6 | 4 | 30 | 5 | 5 | 5 | 42 | 5 |
Wind waves Height (m) Direction Period (s) | E 8 | E 6 | E 6 | E 6 | E 6 | E 6 | E 6 | E 9 | E 9 | E 9 | NNE 6 | E 6 | E 6 | E 6 | E 8 | E 8 | E 6 | E 6 | E 6 | E 6 | E 10 |
| kJ | 460 | 226 | 255 | 188 | 245 | 194 | 75 | 399 | 343 | 390 | 12 | 89 | 191 | 75 | 313 | 356 | 72 | 92 | 171 | 229 | 460 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 12 | 12 | 4 | 12 | 12 | 12 | 4 | 4 | 12 | 12 | 4 | 4 | 4 | 4 | 4 | 12 | 12 | 4 | 4 |
Best forecast wave conditions in Maui | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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