Surf Forecasts:
Duds Reef surf forecast from 27 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 4ft (1.2m), 17s period, S swell with 851 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 1.2m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 9s period and expected on Thursday (Aug 27) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 27th Aug) | 4ft (1.2m) 17s |
Table - best surf conditions forecast for Duds Reef over the next 16 days.
The Lowdown
G’day, Rusty here. Gotta be straight with you—this 16-day window for Duds Reef is a tough one to love. Right now and through the first week, the pattern is locked in with a persistent ENE cross-breeze, mostly fresh strength, and lumpy cross-chop. That combo is making a mess of things. There’s a big gap of very poor days from now until the end of August, with basically no worthwhile surf on offer.
The first real glimmer doesn’t show up until around Monday morning, September 7th. The swell picks up and the wind finally eases. That Monday morning, we’ve got a 4ft swell pushing in from the SSW with a period around 16 seconds—proper long-period groundswell—and combined energy reading 1077 (strong). The wind is a light cross-onshore, so it’s not glassy but it’s manageable. This is the standout period. The optimum swell is from SSE, and SSW is close enough that the reef should handle it well. Keep in mind that with that long period (over 15 seconds), Duds Reef—being a reef break—should shape up nicely, though you’ll want to be an intermediate or better. Crowds are possible here at times, so expect company if it’s looking clean.
Monday afternoon and Tuesday morning offer similar but slightly smaller swell, and energy dips back to moderate. By Tuesday afternoon, September 8th, we get a brief window with a NE cross-off breeze and clean conditions—3ft SSW swell, period 13 seconds—but it’s really just a flicker of quality.
After that, heading into the second week, there’s another small bump Wednesday morning, September 9th, with 5ft ENE swell at a short 10-second period, but the cross-shore wind is light, so it might be rideable for beginners if they’re cautious. Still, nothing else really stands out. The rest of the period fades back into onshore slop and poor conditions.
Water temperature is about average for this time of year, nothing unusual to report. Overall, it’s a lean outlook—Monday September 7th morning is your best bet, and even that’s marginal. Don’t hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 25°C on Thu morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Sun morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | S 17 | S 16 | S 16 | S 14 | S 14 | S 13 | E 7 | E 7 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | ENE 7 | ENE 8 | ENE 8 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 851 | 527 | 582 | 329 | 399 | 289 | 126 | 215 | 187 | 226 | 166 | 199 | 191 | 291 | 244 | 404 | 311 | 360 | 422 | 401 | 347 |
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 | cross | cross | cross | cross | cross | cross |
High Tide | 3:40PM0.70m | 3:53AM0.45m | 4:05PM0.67m | 4:31AM0.50m | 4:31PM0.62m | 5:12AM0.55m | 4:56PM0.56m | 5:56AM0.58m | 5:20PM0.49m | 6:48AM0.60m | 5:42PM0.41m | 7:51AM0.61m | 5:57PM0.35m | ||||||||
Low Tide | 8:51AM0.08m | 10:18PM0.11m | 9:32AM0.10m | 10:37PM0.10m | 10:15AM0.14m | 10:58PM0.09m | 11:02AM0.18m | 11:20PM0.08m | 11:55AM0.24m | 11:45PM0.07m | 1:04PM0.29m | 00:15AM0.07m | 2:51PM0.32m | 00:53AM0.08m | |||||||
 | |  |  | |  | | | | | | | | | | | | | | | | |
 | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — |
 | — | 6:52 | — | — | 6:51 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 |
Feels °C | 25 | 24 | 23 | 25 | 24 | 24 | 24 | 24 | 23 | 24 | 24 | 23 | 25 | 26 | 25 | 27 | 26 | 26 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 17 | S 16 | S 16 | S 14 | S 14 | S 13 | S 13 | S 13 | S 12 | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 10 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 |
| kJ | 851 | 527 | 582 | 329 | 399 | 289 | 121 | 215 | 102 | 226 | 100 | 199 | 191 | 180 | 50 | 404 | 311 | 360 | 422 | 401 | 347 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | S 12 | E 18 | SSW 11 | E 15 | E 14 | S 13 | E 13 | SSW 17 | S 12 | SSW 16 | S 11 | S 11 | S 11 | S 19 | SSW 14 | S 12 | S 11 | E 16 | E 15 | E 14 |
| kJ | 8 | 72 | 24 | 38 | 106 | 104 | 126 | 81 | 186 | 71 | 162 | 87 | 82 | 82 | 192 | 118 | 109 | 35 | 78 | 153 | 144 |
Swell 3 Height (m) Direction Period (s) | W 9 | WNW 9 | NW 9 | E 16 | SSW 19 | SW 19 | E 13 | SSW 17 | E 12 | ENE 11 | ENE 11 | E 11 | S 21 | SSW 19 | SW 15 | W 11 | SW 14 | SW 14 | SSE 10 | SSE 9 | SSE 11 |
| kJ | 7 | 8 | 3 | 45 | 35 | 90 | 89 | 113 | 75 | 43 | 40 | 35 | 76 | 123 | 116 | 9 | 51 | 51 | 33 | 29 | 38 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 6 | ENE 6 | E 6 | E 7 | E 7 | E 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 8 |
| kJ | 141 | 119 | 137 | 84 | 94 | 115 | 126 | 202 | 187 | 166 | 166 | 154 | 187 | 291 | 244 | 268 | 268 | 216 | 181 | 238 | 230 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 13 | 12 | 12 | 144 | 12 | 21 | 24 | 21 | 15 | 24 | 12 | 13 | 21 | 12 | 12 | 21 | 12 | 12 | 12 | 12 |
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.
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