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Avalanche surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 7 am Wednesday 20 May 2026 HSTForecast update in hr min s Forecast update imminent
Avalanche surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Avalanche sea temperature is
25.6° C
(Which is slightly warmer than usual)How big are the waves at Avalanche today?
The current surf forecast for Avalanche at 2PM is: 0.7m 10s primary swell from a North-northwest direction (forecast issued at 07:00am May 20). An open ocean swell of 0.6m 14s is not directed at the surf break, a second open ocean swell of 1.3m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 2ft (0.6m) | 10s |
| Afternoon (20 May) | 2.5ft (0.7m) | 10s |
| Evening (20 May) | 1.5ft (0.5m) | 11s |
Table - waves today at Avalanche. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 25°C on Wed afternoon, min 23°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
NNW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 11 | NNW 11 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | NW 10 | NW 10 | NW 10 | NNW 10 | NW 10 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 7 | NE 7 | NE 8 | NE 8 | |
92 | 67 | 69 | 95 | 75 | 64 | 63 | 41 | 39 | 38 | 24 | 24 | 24 | 18 | 23 | 284 | 289 | 241 | 276 | 239 | 269 | 336 | 300 | 291 | |
Wind (km/h) | ||||||||||||||||||||||||
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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 6:00AM0.09m | 6:40PM0.53m | 7:31AM0.11m | 7:36PM0.48m | 9:08AM0.16m | 8:32PM0.43m | ||||||||||||||||||
Low Tide | 9:42AM-0.02m | 1:31AM0.00m | 10:46AM0.04m | 2:21AM-0.00m | 12:11PM0.09m | |||||||||||||||||||
 |  |  |  | |  | | | | | | | | | |  | | | | | | | | | |
 | 5:52 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | 5:50 |
 | — | — | — | — | 7:06 | — | — | — | — | — | — | — | 7:06 | — | — | — | — | — | — | — | 7:07 | — | — | 7:07 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 24 | 25 | 24 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 23 | 23 | 23 |
24 | 23 | 22 | 23 | 22 | 21 | 20 | 20 | 19 | 20 | 21 | 20 | 20 | 19 | 19 | 19 | 20 | 19 | 20 | 20 | 19 | 19 | 20 | 21 | |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | NNW 10 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | S 16 | S 16 | SSW 16 | S 16 | SSW 15 | S 15 | S 15 | S 15 | S 15 | S 15 | S 14 | S 14 | NW 11 | NW 11 | S 16 |
 kJ | 233 | 183 | 163 | 95 | 152 | 145 | 101 | 101 | 102 | 134 | 134 | 87 | 127 | 174 | 157 | 157 | 157 | 110 | 109 | 103 | 94 | 57 | 57 | 188 |
Swell 2 Height (m) Direction Period (s) | NNW 10 | NNW 10 | NNW 10 | SSW 14 | NNW 11 | NNW 11 | NNW 10 | NNW 10 | S 16 | SSW 13 | SSW 13 | SSW 14 | NW 10 | NNW 10 | NW 10 | SE 9 | NW 10 | SSE 12 | SSE 12 | NNW 11 | NW 11 | S 14 | S 17 | NW 11 |
| kJ | 92 | 67 | 69 | 158 | 75 | 64 | 63 | 41 | 135 | 69 | 60 | 66 | 24 | 18 | 23 | 38 | 25 | 58 | 57 | 45 | 57 | 93 | 143 | 56 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | NNW 12 | SSW 18 | SSW 18 | SSW 18 | S 18 | SSW 17 | SSW 17 | NNW 10 | NNW 10 | NW 10 | NW 10 | SSW 12 | SSE 13 | SSE 13 | SE 13 | SE 12 | NW 10 | NNW 10 | S 18 | S 18 | S 18 | SSW 13 | SSW 13 |
| kJ | 17 | 28 | 64 | 63 | 62 | 56 | 100 | 93 | 39 | 38 | 24 | 24 | 28 | 33 | 33 | 42 | 39 | 25 | 41 | 98 | 98 | 97 | 60 | 60 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | ENE 5 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 7 | NE 7 | NE 8 | NE 8 |
| kJ | 101 | 103 | 139 | 76 | 178 | 175 | 202 | 220 | 220 | 220 | 285 | 335 | 362 | 348 | 356 | 284 | 289 | 241 | 276 | 239 | 269 | 336 | 300 | 291 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 6 | 14 | 14 | 16 | 16 | 16 | 16 | 168 | 168 | 166 | 171 | 166 | 169 | 303 | 171 | 163 | 16 | 16 | 163 | 165 | 163 | 163 | 16 | 16 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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