Surf Forecasts:
Duds Reef surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5PM (local time) - 2.5ft (0.8m), 16s period, SSW swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 2PM (local time) - 3.5ft (1.1m), 17s period, S swell with 710 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5PM (local time) - 2.5ft (0.8m), 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 Friday (Aug 21) at 5PM. The primary swell is predicted to be 0.8m and 16s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Duds Reef in the next 16 days are 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 2PM. 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 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Fri 21st Aug) | 2.5ft (0.8m) 16s |
| Best Surf | 5PM (Fri 21st Aug) | 2.5ft (0.8m) 16s |
| Most Powerful | 2PM (Thu 27th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Duds Reef over the next 16 days.
The Lowdown
Alright, let’s break this down for Duds Reef. Honestly, the next couple of weeks look pretty bleak. There’s a long stretch of poor, blown-out conditions, and only one real window of opportunity right at the end of the month.
The first chance to get wet is this Friday, the 21st of August. The morning is marginal with a 3ft SSW swell, a very long 17-second period, and light SSE winds at 6 mph. The energy is weak. But Friday afternoon is the gem – glassy conditions with SSW winds at only 3 mph, the same 3ft swell but a 16-second period. That’s the cleanest, most fun you’ll have all week. The water temp is about normal for this time of year.
Then it gets ugly. From Saturday the 22nd straight through to the end of the month, cross-shore winds from the ENE, gusting from 18 to 25 mph, will tear the surface apart. The swell gets bigger, but it’s a total mess. On the 23rd, there’s a 5ft short-period E swell at 7 seconds, but with 25 mph winds, it’s unrideable. This is a long, frustrating gap.
For the patient ones, things change around Sunday the 30th of August. The swell hits 5ft to 5ft, but the wind is still a cross-shore mess at 18 mph. The energy is moderate to strong, but the quality is poor. The only real standout, and I mean the only one, is Monday the 31st of August.
On Monday the 31st, the swell jumps to 7ft to 8ft from the ENE with a 13-second period, and the wind finally turns cross-offshore from the NE at 18 mph. The energy is massive. The conditions are clean. This is serious groundswell. Tuesday the 1st of September, it pushes 8ft to 8ft from the E, also 13 seconds, with cross-offshore NNE winds, but the wind is howling at 25 to 31 mph. The energy is enormous. It’s a near-gale, and while the surface might be clean, that’s a heavy, expert-only wave.
So, the pick of the fortnight is Monday the 31st of August. The 8ft ENE swell, with that long period and clean cross-offshore wind, will be the best size and quality on offer. It’s a big, powerful reef wave, so it’s not for beginners, but for the experienced crew, it’s the only session worth the wait.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 25°C on Thu night). Winds increasing (calm on Thu night, fresh winds from the ENE by Sat night). | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Mon morning, min 24°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 | SSW 17 | SSW 16 | SW 16 | SSW 16 | SSW 16 | SW 16 | E 7 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 16 | ENE 7 | SSW 15 | SSW 14 | S 18 | S 19 |
Wave Graph  | |||||||||||||||||||
 kJ | 347 | 368 | 326 | 367 | 326 | 314 | 245 | 226 | 195 | 186 | 166 | 156 | 140 | 146 | 208 | 167 | 215 | 390 | 365 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 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 | 3:13PM0.72m | 3:16AM0.40m | |||||||
Low Tide | 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 | 8:10AM0.07m | 10:00PM0.13m | ||||||||
 |  |  |  | | | | | | | | | | | | | | | | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:58 | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 27 | 27 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 30 | 30 | 30 | 30 | 24 | 25 | 23 | 24 | 24 | 25 | 25 | 25 | 26 | 26 | 24 | 24 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 17 | SSW 16 | SW 16 | E 7 | SSW 16 | SW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | E 7 | SSW 15 | SSW 14 | S 18 | S 19 |
| kJ | 347 | 368 | 326 | 367 | 94 | 314 | 245 | 201 | 191 | 186 | 166 | 156 | 140 | 117 | 131 | 167 | 215 | 390 | 365 |
Swell 2 Height (m) Direction Period (s) | ENE 7 | ENE 7 | W 10 | W 10 | SSW 16 | WNW 10 | S 14 | SSE 13 | WNW 11 | SSE 13 | SSE 12 | SSE 12 | SSW 17 | SSE 13 | SSW 16 | SSW 12 | S 18 | SSW 13 | SSW 13 |
| kJ | 57 | 40 | 49 | 50 | 326 | 85 | 106 | 139 | 47 | 95 | 86 | 48 | 92 | 92 | 196 | 81 | 165 | 135 | 137 |
Swell 3 Height (m) Direction Period (s) | W 9 | W 11 | E 8 | S 13 | W 10 | S 12 | WNW 10 | WNW 11 | SSE 12 | E 8 | NW 12 | E 8 | SSE 12 | SSW 16 | SSW 12 | S 18 | SSE 12 | NW 10 | S 17 |
| kJ | 42 | 82 | 29 | 55 | 73 | 47 | 62 | 68 | 44 | 36 | 35 | 22 | 47 | 146 | 81 | 167 | 27 | 17 | 146 |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 7 | — | E 7 | E 7 | E 7 | E 7 | E 7 | E 6 | E 6 | E 7 | E 7 | ENE 7 | E 7 | E 6 | E 7 | E 7 |
| kJ | — | — | — | 45 | — | 121 | 223 | 226 | 195 | 152 | 128 | 98 | 104 | 124 | 208 | 150 | 113 | 150 | 94 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 15 | 0 | 12 | 15 | 22 | 21 | 22 | 22 | 12 | 15 | 21 | 12 | 14 | 13 | 12 | 15 | 15 | 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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