Duds Reef Surf Break

Lat Long: 21.31° N 158.01° W

Duds Reef Surf Forecast and Surf Report

Issued: 7 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Duds Reef sea temperature is
27.1° C
0.3° 

Duds Reef surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


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 TypeTime (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 Powerful11PM (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 Forecast

Mostly 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 Summary

Light 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
Rating
(10 max)
2
1
2
1
0
1
1
0
0
0
0
0
0
0
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SSW
16
0.7
SW
18
0.7
SW
17
0.8
SSW
16
0.8
SSW
17
0.8
SSW
16
0.9
SW
16
0.8
SSW
16
0.8
SSW
16
0.7
SW
16
1.6
ENE
7
1.6
E
7
1.6
E
7
1.5
E
7
1.3
E
7
1.5
E
7
1.6
E
7
1.5
E
7
1.3
E
8
Wave Graph
Metric surfscale
Energy kJ
175
316
305
347
368
326
367
326
314
245
247
240
254
202
157
220
254
246
191
Wind (km/h)
10
NE
5
SSE
5
SSW
5
ENE
10
SSE
10
SSW
10
ENE
35
ENE
35
ENE
40
ENE
40
ENE
40
ENE
35
ENE
40
ENE
30
ENE
25
ENE
20
ENE
25
ENE
20
ENE
Wind State
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
thunderstorm
part cloud
thunderstorm
cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:11
6:11
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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