
Surf Forecasts:
Duds Reef surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 2PM (local time) - 21ft (6.5m), 12s period, E swell with 11,005 kJ wave energy.
Best Forecast Surf Conditions for Duds Reef this week:
The most powerful waves expected at Duds Reef in the next 16 days are 6.5m 12s and forecast to arrive on Saturday (Aug 15) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Sunday (Aug 09) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sat 15th Aug) | 21ft (6.5m) 12s |
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 we’ve got coming up for Duds Reef.
Right off the bat, I gotta be straight with you – this is a tough stretch. We’re looking at a long, frustrating run of poor conditions. The first real chance of anything even close to worthwhile doesn’t pop up until Monday the 10th of August, and even then it’s just marginal. Before that, from now through Sunday the 9th, it’s all cross-shore winds with lumpy, messy surf. We’re talking small, weak energy with a combined energy reading of only 493, and that’s with a long period swell of 18 seconds that just gets chopped up by the wind. Not worth paddling out.
That Monday morning the 10th sees a little bump in size to 5ft, but it’s short period windswell at 7 seconds and still cross-shore. The energy picks up to 677, but it’s just not clean. The afternoon drops right back down.
We get a bit of a pulse mid-week. Wednesday the 12th and Thursday the 13th see some better swell energy moving in from the south, with the combined energy jumping into the four-digit range – 1050 on Wednesday morning and up to 1186 on Thursday morning. Swell heights around 3ft to 5ft, with a long period of 18 seconds on Wednesday and 16 seconds on Thursday, suggesting some real groundswell. But here’s the kicker – it’s still cross-shore wind from the ENE, blowing 18 to 22 mph. That’s gonna keep things lumpy and choppy. The forecast calls it marginal, but honestly, with that wind, it’s a tough call. The water temp is 81°, which is about average for this time of year.
Things go downhill fast after that. Friday the 14th and Saturday the 15th get big – like, 8ft to 16ft big, and then a whopping 23ft on Saturday afternoon – but the wind is howling. We’re talking 28 mph cross-shore winds creating a messy, dangerous mess. The combined energy on Saturday afternoon hits a massive 14540, but with that wind and that size, it’s strictly for the kamikaze crew or maybe the kite surfers. This is not a paddle situation.
The following week is more of the same: persistent cross-shore winds, lumpy conditions, and poor surf quality. There’s a flicker of hope on Thursday the 20th of August. The wind drops right back to a light breeze, only 3 mph from the east, and the swell is 6ft with an 8-second period. The combined energy is 965, and the forecast gives it a 2 out of 10 – the highest score in the whole outlook. That light wind will make for the cleanest conditions we’ve seen in weeks, but the swell is short period and cross-shore, so it’s still just marginal.
So, if I had to pick one standout, it would be that Thursday afternoon the 20th of August. The wind will be almost glassy, and the waves will have some push. It’s not going to be perfect, but it’s the best we’re going to get. After that, it’s back to the same old story: cross-shore wind and lumpy surf right through to the end of the outlook on the 23rd.
It’s a bleak run, folks. Sometimes it just doesn’t line up.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Mon afternoon, min 25°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue morning, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
AM | PM | 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 18 | SSW 13 | SSW 17 | E 7 | ENE 8 | SSW 16 | ENE 7 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | E 8 | E 8 | E 10 |
Wave Graph | |||||||||||||||||||||
221 | 156 | 202 | 150 | 173 | 288 | 252 | 234 | 246 | 218 | 269 | 373 | 627 | 741 | 1029 | 991 | 763 | 636 | 539 | 947 | 2118 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross | cross | cross | cross | cross |
High Tide | 1:11PM0.75m | 00:30AM0.24m | 2:00PM0.80m | 1:39AM0.27m | 2:43PM0.83m | 2:33AM0.31m | 3:23PM0.83m | 3:22AM0.36m | 3:59PM0.80m | 4:08AM0.41m | 4:32PM0.75m | 4:55AM0.46m | 5:02PM0.68m | ||||||||
Low Tide | 9:04PM0.19m | 6:05AM0.04m | 9:29PM0.15m | 7:07AM0.02m | 9:56PM0.13m | 8:02AM0.01m | 10:23PM0.11m | 8:53AM0.02m | 10:50PM0.10m | 9:42AM0.06m | 11:15PM0.09m | 10:30AM0.11m | 11:40PM0.09m | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 27 | 28 | 26 | 28 | 29 | 26 | 27 | 27 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 |
Feels °C | 25 | 24 | 24 | 27 | 27 | 26 | 28 | 27 | 26 | 25 | 25 | 24 | 24 | 24 | 23 | 24 | 23 | 23 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 13 | E 7 | SSW 13 | SSW 12 | SSW 16 | E 8 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | ESE 15 |
175 | 156 | 113 | 133 | 85 | 288 | 160 | 234 | 246 | 218 | 269 | 299 | 627 | 741 | 1029 | 991 | 763 | 636 | 496 | 411 | 355 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SW 18 | SSW 13 | SW 16 | S 18 | SSW 12 | SSW 15 | SSE 10 | SSW 11 | SSE 9 | SSE 9 | S 20 | SSW 13 | SSW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | E 13 | ESE 14 | S 14 |
221 | 154 | 154 | 130 | 156 | 56 | 184 | 36 | 23 | 32 | 30 | 373 | 289 | 289 | 28 | 27 | 28 | 25 | 81 | 201 | 306 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSW 17 | SSW 18 | SW 16 | SSE 10 | SSW 12 | SSW 11 | SE 9 | SSW 11 | S 21 | SE 9 | SE 8 | SE 9 | SSE 9 | SSE 9 | SSE 10 | SW 18 | WNW 12 | W 12 | W 11 |
18 | 32 | 202 | 102 | 127 | 18 | 81 | 49 | 21 | 40 | 79 | 20 | 18 | 20 | 8 | 8 | 10 | 13 | 27 | 11 | 9 | |
Wind waves Height (m) Direction Period (s) | E 6 | ENE 6 | NE 7 | E 7 | ENE 8 | E 7 | ENE 7 | E 8 | E 7 | E 7 | E 7 | E 6 | E 6 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 | E 8 | E 10 |
79 | 123 | 86 | 150 | 173 | 226 | 252 | 201 | 199 | 127 | 106 | 119 | 116 | 134 | 211 | 187 | 247 | 413 | 539 | 947 | 2118 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 24 | 12 | 12 | 21 | 12 | 12 | 13 | 12 | 12 | 12 | 12 | 12 | 21 | 12 | 27 | 27 | 22 | 27 | 146 | 183 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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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.











