Surf Forecasts:
How big are the waves at Backdoor today (21 Aug):
- Morning surf: Morning surf (21 Aug, local time) - 1.5ft (0.5m), 17s period with SW swell.
- Afternoon surf: Afternoon surf (21 Aug, local time) - 2.5ft (0.8m), 7s period with NNE swell.
- Evening surf: Evening surf (21 Aug, local time) - 1.5ft (0.5m), 16s period with SW swell.
The current surf forecast for Backdoor at 1AM is: 0.8m 6s primary swell from a North-northeast direction (forecast issued at 07:00pm August 20). An open ocean swell of 0.9m 7s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Aug) | 1.5ft (0.5m) | 17s |
| Afternoon (21 Aug) | 2.5ft (0.8m) | 7s |
| Evening (21 Aug) | 1.5ft (0.5m) | 16s |
Table - waves today at Backdoor. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 25°C on Thu night). Winds increasing (light winds from the SE on Fri morning, fresh winds from the E by Sat night). | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 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) | W 11 | WSW 10 | NNE 7 | NNE 6 | SW 16 | SW 17 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | SW 16 | SW 16 | SW 16 | WNW 10 | W 10 | W 10 | WNW 14 | W 12 | WNW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 36 | 33 | 51 | 45 | 133 | 135 | 59 | 53 | 41 | 41 | 124 | 124 | 122 | 34 | 51 | 52 | 80 | 77 | 195 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 12:16PM0.64m | 12:49PM0.67m | |||||||||||||||||
Low Tide | 2:10AM0.18m | 3:50AM0.17m | |||||||||||||||||
 |  |  | | | | |  | | | | | | | | | | | | |
 | — | — | — | — | 6:11 | — | — | — | — | — | — | — | 6:11 | — | — | — | — | — | — |
 | 6:59 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:57 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 25 | 25 |
Feels °C | 28 | 30 | 30 | 29 | 29 | 30 | 30 | 30 | 30 | 29 | 27 | 26 | 27 | 26 | 27 | 25 | 26 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | NNE 7 | NNE 7 | E 8 | NNE 7 | NNE 7 | NNE 7 | SW 16 | SW 16 | WNW 10 | W 10 | W 10 | WNW 14 | W 12 | WNW 13 |
| kJ | 160 | 164 | 94 | 89 | 69 | 56 | 59 | 72 | 41 | 41 | 26 | 124 | 122 | 34 | 51 | 52 | 80 | 69 | 195 |
Swell 2 Height (m) Direction Period (s) | W 11 | WSW 10 | NNE 7 | NNE 6 | NNE 6 | ENE 7 | ENE 7 | NNE 7 | SW 16 | SSW 16 | SW 16 | W 10 | WNW 10 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | WNW 14 | SW 16 |
| kJ | 36 | 33 | 51 | 45 | 45 | 36 | 38 | 53 | 64 | 98 | 124 | 31 | 33 | 98 | 98 | 97 | 95 | 77 | 61 |
Swell 3 Height (m) Direction Period (s) | SW 17 | SW 17 | WSW 10 | W 9 | SW 16 | SW 17 | W 11 | W 10 | W 10 | W 10 | W 10 | WSW 10 | WSW 10 | WSW 10 | WSW 10 | WNW 15 | WNW 11 | SW 16 | WSW 9 |
| kJ | 76 | 70 | 31 | 28 | 133 | 135 | 36 | 33 | 31 | 31 | 34 | 10 | 10 | 10 | 10 | 22 | 37 | 62 | 8 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 7 | E 7 | E 7 | ENE 7 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 |
| kJ | — | — | — | — | — | — | — | — | 68 | 103 | 114 | 157 | 166 | 171 | 208 | 236 | 258 | 297 | 341 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 13 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 24 | 24 | 24 | 24 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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