Surf Forecasts:
Duds Reef surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 2AM (local time) - 2ft (0.6m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 11PM (local time) - 2.5ft (0.8m), 19s period, S swell with 455 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 2ft (0.6m), 16s period with SSW 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 Thursday (Aug 20) at 2AM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.9m and 8s. Another secondary swell of 0.9m and 7s is also forecast. 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 0.8m 19s and forecast to arrive on Wednesday (Aug 26) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 10s period and expected on Saturday (Aug 22) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 20th Aug) | 2ft (0.6m) 16s |
| Best Surf | 2AM (Thu 20th Aug) | 2ft (0.6m) 16s |
| Most Powerful | 11PM (Wed 26th Aug) | 2.5ft (0.8m) 19s |
Table - best surf conditions forecast for Duds Reef over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking for the next couple of weeks.
Right off the bat, I gotta be straight with you – the start of this forecast is a tough one. The ocean’s just not cooperating for a proper paddle session. We’ve got a small, long-period SW groundswell rolling in, but the wind is a mess and the conditions are everywhere. The water temp is sitting at a warm 81°F, which is pretty much bang on average for this time of year, so at least you won’t need a thick suit.
The first real glimmer of hope is on Friday, August 21st, in the afternoon. Duds Reef is calling our name. We’re looking at a clean 3 ft SSW swell with a 16-second period, and the wind is forecast to go glassy. That’s the kind of smooth, mirror-like surface we live for. The swell energy is moderate at 366, and the wind is offshore light, so the reef should be offering up some clean, lined-up waves. This is a standout session for the patient surfer.
Moving into the second week, the pattern gets a bit more interesting, but the wind turns messy again. A strong E/ENE wind kicks in, making a mess of things for a few days. However, look at Wednesday, August 26th, in the afternoon. We’ve got a clean 3 ft S swell and a 18-second period, with a light cross-offshore breeze from the NNE. The combined energy is strong at 660, and the conditions are described as clean. That’s a real sweet spot for Duds Reef – a long-period groundswell wrapping in with no wind chop.
Then, on Thursday, August 27th, the afternoon session is another one to circle. The swell drops to 3 ft from the S, but the period is a solid 16 seconds and the wind is a light cross-offshore from the NNE again. The wave energy is strong at 693, and the report says “clean.” This is a proper small-wave reef day, where the lines will be long and the takeoffs forgiving.
The very end of the run, on September 1st and 2nd, sees a jump in size. The swell pushes to 7-7 ft from the E, with a 10-second period. The combined energy is very strong (1204 and 1075). This is solid, meaty surf, but it’s still cross-shore wind, so it’ll be a bit lumpy. This is more for the experienced crew; beginners should stay out of the way. The long period groundswell will be better for the reef setup here, but the cross-shore breeze will keep it from being truly perfect.
Overall, the best bets are the late afternoon glass-off on the 21st, and the clean windows on the 26th and 27th. The rest of the time, we’re fighting the wind or the size.
Rusty out.
Short Range ForecastMostly dry. Warm (max 28°C on Sat afternoon, min 24°C on Wed night). Winds increasing (calm on Fri night, fresh winds from the ENE by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 28°C on Tue afternoon, min 25°C on Sat night). Winds decreasing (strong winds from the ENE on Sun afternoon, light winds from the ENE by Mon night). | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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) | SSW 16 | SW 18 | SW 17 | SSW 16 | SSW 17 | SSW 16 | SW 16 | SSW 16 | SSW 16 | SW 16 | ENE 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 |
Wave Graph | |||||||||||||||||||
175 | 316 | 305 | 347 | 368 | 326 | 367 | 326 | 314 | 245 | 247 | 240 | 254 | 202 | 157 | 220 | 254 | 246 | 191 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | glassy | cross | on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 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 | 2:45PM0.72m | 2:41AM0.35m | ||||||||
Low Tide | 2:04AM0.14m | 3:11AM0.15m | 9:15PM0.23m | 9:01PM0.20m | 5:49AM0.13m | 9:11PM0.18m | 6:44AM0.10m | 9:26PM0.16m | 7:29AM0.08m | 9:43PM0.15m | |||||||||
— | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:59 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | 2 |
Temp °C | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 28 | 26 |
Feels °C | 26 | 30 | 29 | 31 | 30 | 30 | 32 | 25 | 26 | 23 | 24 | 24 | 22 | 25 | 26 | 26 | 27 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | E 8 | ENE 7 | SSW 16 | SSW 17 | SSW 16 | SW 16 | SSW 16 | SSW 16 | SW 16 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 |
104 | 55 | 73 | 347 | 368 | 326 | 367 | 326 | 314 | 245 | 232 | 191 | 186 | 166 | 156 | 127 | 86 | 196 | 167 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SW 18 | SW 17 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | W 10 | WNW 11 | S 14 | S 13 | WNW 11 | SSE 13 | SSE 12 | E 8 | SSE 11 | SSW 16 | SSW 12 | SSW 12 |
175 | 316 | 305 | 57 | 40 | 40 | 30 | 74 | 95 | 106 | 90 | 46 | 96 | 85 | 51 | 79 | 147 | 56 | 81 | |
Swell 3 Height (m) Direction Period (s) | S 12 | S 11 | W 11 | W 9 | W 11 | W 10 | W 10 | S 15 | S 12 | WNW 10 | WNW 11 | SSE 11 | NW 11 | NW 12 | SSE 12 | SSW 17 | SSE 8 | SSE 7 | S 18 |
45 | 63 | 57 | 42 | 82 | 49 | 48 | 109 | 47 | 62 | 68 | 43 | 31 | 34 | 81 | 93 | 23 | 19 | 167 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | — | — | — | — | — | — | E 6 | ENE 7 | E 7 | ENE 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 |
75 | — | — | — | — | — | — | 54 | 135 | 200 | 247 | 240 | 254 | 202 | 157 | 220 | 254 | 246 | 191 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 0 | 10 | 6 | 0 | 15 | 0 | 6 | 15 | 24 | 24 | 31 | 145 | 145 | 31 | 12 | 12 | 12 | 12 |
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.











