Surf Forecasts:
Duds Reef surf forecast from 18 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 2AM (local time) - 3ft (0.9m), 15s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3.5ft (1.0m), 19s period, SSW swell with 708 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 2AM (local time) - 3ft (0.9m), 15s 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 Tuesday (Jul 21) at 2AM. The primary swell is predicted to be 0.9m and 15s period with a secondary swell of 0.9m and 7s. Another secondary swell of 1.2m 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 1.0m 19s and forecast to arrive on Thursday (Jul 23) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 13s period and expected on Saturday (Jul 18) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 21st Jul) | 3ft (0.9m) 15s |
| Best Surf | 2AM (Tue 21st Jul) | 3ft (0.9m) 15s |
| Most Powerful | 8PM (Thu 23rd Jul) | 3.5ft (1.0m) 19s |
Table - best surf conditions forecast for Duds Reef over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s break it down in feet and miles per hour.
The first week is a total bust. A big gap of nothing until Monday the 20th, and even that’s just a tease. The wind is a brutal cross-shore from the ENE, blowing hard and ruining the surface. Water temp is about 80°F, which is normal for the season.
On Monday the 20th, Duds Reef gets a tiny pulse of long-period S swell at 2ft to 3ft. The period is a massive 16 seconds, so it’s a proper groundswell, but the energy is moderate. The wind is still cross, so it’s messy. It’s a marginal call.
The big one, the only true standout, is Wednesday the 29th of July. That morning, Duds Reef gets a solid 15ft of ENE swell, with energy going through the roof. That’s a powerful, groundswell-driven beast. The wind is still moderate cross-shore, so it’s not perfect, but it’s huge. Then, that afternoon, the wind shifts to a cross-offshore from the NE, the swell drops to 13ft, and the description says “clean.” That afternoon is the best session in the whole 16 days. The waves will be big, powerful, and clean. This is strictly for experts – over 8ft means it’s dangerous for beginners.
The next day, Thursday the 30th, the swell drops to 8ft with a light onshore wind. It’s still punchy, but the quality drops off. After that, it fades back into poor, messy surf.
So, the plan is simple: wait out the first week of junk. The big day is Wednesday the 29th, especially the afternoon. That’s the one to circle.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat morning, min 24°C on Sat night). Winds decreasing (fresh winds from the ENE on Sat morning, light winds from the NE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue morning, min 24°C on Wed night). Winds increasing (light winds from the ENE on Tue morning, strong winds from the ENE by Thu afternoon). | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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) | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | E 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 274 | 253 | 257 | 219 | 190 | 177 | 193 | 407 | 343 | 329 | 311 | 342 | 437 | 426 | 480 | 561 | 395 | 616 | 329 | 428 | 427 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross | cross | cross | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 6:44PM0.60m | 8:16AM0.46m | 7:10PM0.51m | 9:31AM0.50m | 7:31PM0.43m | 10:46AM0.54m | 7:33PM0.36m | 11:52AM0.59m | 12:45PM0.63m | 10:43PM0.26m | 1:30PM0.66m | 00:28AM0.25m | |||||||||
Low Tide | 12:16PM0.22m | 1:44AM0.11m | 1:23PM0.30m | 2:15AM0.11m | 3:02PM0.36m | 2:48AM0.12m | 6:02PM0.36m | 3:27AM0.12m | 4:16AM0.12m | 9:32PM0.26m | 5:13AM0.11m | 9:33PM0.22m | |||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 24 | 26 | 27 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 22 | 22 | 24 | 24 | 24 | 25 | 26 | 25 | 26 | 25 | 24 | 24 | 23 | 23 | 22 | 23 | 23 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 14 | SSW 12 | SSW 13 | S 13 | SSW 11 | S 16 | S 16 | ENE 7 | S 14 | S 14 | S 13 | S 13 | SSW 23 | S 13 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 |
| kJ | 187 | 210 | 121 | 129 | 126 | 71 | 193 | 407 | 89 | 329 | 311 | 342 | 173 | 426 | 206 | 561 | 395 | 616 | 329 | 428 | 298 |
Swell 2 Height (m) Direction Period (s) | W 13 | W 13 | SSE 9 | SE 6 | S 18 | S 18 | S 13 | SW 18 | S 15 | SW 17 | SSW 16 | E 13 | E 12 | E 11 | SSW 22 | S 12 | S 11 | S 11 | S 12 | S 12 | S 20 |
| kJ | 87 | 87 | 30 | 10 | 107 | 152 | 121 | 80 | 343 | 73 | 103 | 84 | 102 | 89 | 480 | 129 | 123 | 55 | 143 | 102 | 396 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SSE 9 | WNW 12 | S 19 | WNW 12 | SW 19 | SW 18 | W 12 | SW 16 | E 12 | E 11 | SW 15 | SSW 24 | S 13 | E 12 | SSW 16 | SSW 16 | S 13 | SSW 16 | S 21 | S 12 |
| kJ | 17 | 30 | 52 | 66 | 29 | 92 | 83 | 11 | 132 | 25 | 23 | 60 | 437 | 125 | 146 | 99 | 173 | 85 | 94 | 329 | 104 |
Wind waves Height (m) Direction Period (s) | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | E 7 | ENE 7 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 |
| kJ | 274 | 253 | 257 | 219 | 190 | 177 | 151 | 199 | 144 | 67 | 79 | 110 | 110 | 111 | 112 | 258 | 297 | 271 | 250 | 358 | 427 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 21 | 22 | 16 | 12 | 22 | 12 | 12 | 12 | 0 | 12 | 12 | 12 | 13 | 21 | 12 | 21 | 30 | 12 | 15 | 173 | 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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