Surf Forecasts:
Duds Reef surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.7m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 8AM (local time) - 6.5ft (2.0m), 8s period, E swell with 446 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.7m), 12s period with S swell.
Best Forecast Surf Conditions for Duds Reef this week:
The surf forecast for Duds Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 5AM. The primary swell is predicted to be 0.7m and 12s period with a secondary swell of 0.9m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Duds Reef in the next 16 days are 2.0m 8s and forecast to arrive on Monday (Aug 24) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Wednesday (Aug 19) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 19th Aug) | 2.5ft (0.7m) 12s |
| Best Surf | 5AM (Wed 19th Aug) | 2.5ft (0.7m) 12s |
| Most Powerful | 8AM (Mon 24th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Duds Reef over the next 16 days.
The Lowdown
Alright, Rusty here, giving you the lowdown on the local surf. Let’s be honest, we’re staring down a long stretch of flat, blown-out nothing. The first time you’d even think about paddling out is Thursday afternoon, August 20th, at Duds Reef. That’s a good few days of getting skunked, so be patient.
Water temp at Duds Reef is 81°F, which is right about average for the season.
So, Thursday afternoon, August 20th, is your first real chance. The wind goes completely glassy, dead calm, which is a huge bonus. We’re looking at a tiny 2ft swell from the southwest, with a moderate energy level (398). The swell period is a long 17 seconds, a proper groundswell, and for a reef break like Duds, that’s a good thing – it’ll wrap in and give you some shape. It’s ankle to knee high, but clean and rideable on a longboard.
After that, it’s a long grind. From Friday morning, August 21st, all the way through the end of the month, the trade winds decide to ruin everything. They’re blowing from the ENE at 19 to 25 mph, and it’s a constant cross-shore. The swell gets bigger, with the combined energy climbing well into the hundreds and even hitting 1722 by August 29th, but the wind just tears it apart. The charts keep saying “poor surf conditions,” and that’s the truth. It’s going to be lumpy, choppy, and a total mess.
The one standout, way down the line, is the start of September. It’s a long-range call, but it looks promising. On the morning of September 2nd, we’ve got a 4ft swell from the south with a very long period of 19 seconds, and the energy is high at 1637. The wind is light, just a slight air from the east, so it should be clean. But the report says “marginal surf forecast,” so don’t get your hopes up too high. The swell direction is south, not the ideal SSE for Duds, so it might not fire perfectly. Still, it’s the best thing on the horizon.
Bottom line: the first week is a washout. The second week has some size but it’s all wind-affected. Your best bet is that glassy Thursday afternoon, or keep an eye on the first few days of September for a shot at something cleaner.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Mon afternoon. Warm (max 28°C on Sat afternoon, min 25°C on Fri night). Winds increasing (light winds from the E on Fri night, near gales from the ENE by Mon morning). | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | S 13 | SW 16 | SW 16 | SSW 16 | SW 18 | SW 17 | SSW 16 | SSW 17 | SSW 16 | SW 16 | SSW 16 | SSW 16 | E 7 | E 7 | E 7 | E 7 | E 7 | E 9 | E 8 |
Wave Graph | |||||||||||||||||||
114 | 129 | 125 | 175 | 316 | 305 | 347 | 364 | 326 | 367 | 326 | 314 | 339 | 254 | 274 | 324 | 315 | 430 | 408 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | glassy | cross | glassy | on | on | cross | cross | cross | cross | cross | cross-off | cross-off | cross | cross | cross |
High Tide | 9:42AM0.56m | 11:04AM0.57m | 12:12PM0.60m | 11:03PM0.23m | 1:02PM0.64m | 00:38AM0.25m | 1:42PM0.67m | 1:26AM0.28m | 2:15PM0.70m | 2:05AM0.31m | |||||||||
Low Tide | 1:23AM0.13m | 2:04AM0.14m | 3:11AM0.15m | 9:15PM0.23m | 9:01PM0.20m | 5:49AM0.13m | 9:11PM0.18m | 6:44AM0.10m | 9:26PM0.16m | ||||||||||
— | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | |
7:00 | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 11 |
Temp °C | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 28 | 25 | 27 | 27 | 25 | 26 | 26 | 26 |
Feels °C | 25 | 27 | 27 | 28 | 30 | 29 | 30 | 29 | 29 | 31 | 25 | 25 | 23 | 24 | 24 | 22 | 23 | 22 | 27 |
Swell 1 Height (m) Direction Period (s) | S 13 | E 8 | E 8 | E 8 | E 8 | SW 17 | SSW 16 | SSW 17 | SSW 16 | SW 16 | ENE 7 | SSW 16 | SW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 |
114 | 88 | 86 | 82 | 55 | 305 | 347 | 364 | 326 | 367 | 60 | 314 | 245 | 201 | 191 | 186 | 166 | 156 | 127 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | SW 16 | S 12 | SSW 16 | SW 18 | E 7 | ENE 7 | ENE 7 | W 11 | ENE 7 | SSW 16 | WNW 11 | WNW 12 | S 13 | WNW 11 | E 11 | E 10 | NW 11 | SSE 9 |
79 | 129 | 71 | 175 | 316 | 40 | 57 | 40 | 82 | 52 | 326 | 91 | 106 | 128 | 47 | 63 | 74 | 30 | 29 | |
Swell 3 Height (m) Direction Period (s) | WNW 12 | S 12 | SW 16 | S 12 | W 11 | S 11 | W 9 | W 11 | ENE 7 | W 10 | W 10 | SSE 12 | S 14 | WNW 11 | SSE 11 | SSE 13 | SSE 14 | SSE 13 | SSW 17 |
48 | 69 | 125 | 45 | 35 | 21 | 27 | 79 | 40 | 73 | 74 | 50 | 106 | 65 | 41 | 98 | 74 | 31 | 93 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | NNE 6 | NE 6 | — | — | — | — | — | ENE 7 | — | ENE 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 9 | E 8 |
109 | 54 | 26 | 39 | — | — | — | — | — | 105 | — | 121 | 339 | 254 | 274 | 324 | 315 | 430 | 408 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 10 | 12 | 0 | 0 | 6 | 0 | 15 | 12 | 6 | 13 | 21 | 14 | 22 | 183 | 183 | 173 | 31 | 21 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Duds Reef Surf forecast
The above surf forecast table for Duds Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Duds Reef can be found by selecting the local surf guide option on the grey menu. Our Duds Reef surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Duds Reef) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Duds Reef may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Duds Reef is 0 km (0 miles) from 'Ewa Beach. If you plan a vacation in Oahu, look for hotels and other accommodation in 'Ewa Beach. 'Ewa Beach has rooms for a wide range of budgets as well as car hire and transport links.











