Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 7 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Waimanalo sea temperature is
26.8° C
0.1° 

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


Waimanalo surf forecast from 20 Aug 2026:

  • Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 7ft (2.1m), 7s period, E swell with 420 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 2.1m 7s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 12s period and expected on Sunday (Aug 23) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Tue 25th Aug)7ft (2.1m) 7s

Table - best surf conditions forecast for Waimanalo over the next 16 days.


The Lowdown

Alright, this is Rusty. Let’s be straight with you – we’re looking at Waimanalo right now, and the next couple of weeks are a real mixed bag. For the most part, it’s going to feel like a waiting game with a whole lot of wind and not much quality.

Right from Wednesday the 19th and for the next several days, it’s just tough. We’ve got onshore trade winds that just won’t quit, blowing from the ENE at 15-25 mph. That’s clobbering the surf, keeping things messy and lumpy. Sure, there’s some small wave energy ticking over, around the 3 to 5 ft mark, but with short, choppy periods of 6-8 seconds and that relentless wind, it’s just not worth paddling out. It’s a lot of blown-out, poor surf conditions. Don’t even think about it.

That rough run carries on right through that first week and into the next. From the 22nd through to the 31st of August, the swell bumps up a notch, hitting 6 to 8 ft, with the combined energy getting strong in the hundreds (e.g. 427, 573, 798). But here’s the heartbreak – even with more size, the wind is still hammering it onshore. It’s a wall of lumpy, choppy mess, and those conditions are just a kite surfer’s dream, not a soul surfer’s.

Now, hold on for the real story. The only flash of light is on September 1st. We get a big jump in quality, but it’s still no good. The swell hits 8 ft with a long period of 12 seconds from the east, piling up a massive combined energy reading of 1818. That is serious energy. But the report still calls it poor, likely because that massive east swell collides with the wind and shape of the break. Then, on the 2nd of September, it changes. For Wednesday morning, we get very light wind from the NE at 3 mph, with that same 8 ft of swell from the ENE with a period of 9 seconds, and energy still high at 888. It’s “marginal”, but by Wednesday afternoon, the wind shifts to a light offshore from the south at 6 mph. For the first time, the data tells us to *expect very good surf conditions*. That’s our standout – Wednesday the 2nd of September afternoon at Waimanalo. The water is about average for the season, with the temp sitting at 80°F.

The 8 ft swell is solid and beefy for Waimanalo; it’s going to be a powerful wave. Since it's mostly an exposed beach setup, you need to be comfortable on a bigger, more critical wave. That south wind will be offshore, cleaning up the faces, promising a nice, smooth wall. Get out there if you can, but mind the locals – crowds are possible at this spot.

After that, the 3rd of September sees the wind shift cross-onshore again, turning it back to a more marginal day. That’s the window. That Wednesday afternoon is your real best bet; everything else gets a hard pass from me.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Wed night). Winds increasing (light winds from the ENE on Thu night, fresh winds from the ENE by Sat afternoon).

Days 5-7 Weather Summary

Light rain (total 6mm), mostly falling on Mon morning. Warm (max 26°C on Mon morning, min 25°C on Sat night). Mainly strong winds.

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)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
E
8
0.9
NE
7
1.2
ENE
7
0.8
ENE
7
0.7
NE
7
1
E
7
1.1
ENE
7
1.3
ENE
6
1.7
E
6
1.8
E
7
2.2
ENE
7
1.8
ENE
7
1.7
ENE
6
1.8
ENE
6
1.9
ENE
6
2
E
7
2
E
7
1.9
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
102
75
138
69
47
106
102
134
232
302
410
290
226
265
312
360
366
362
232
Wind (km/h)
15
NE
10
NE
15
NE
5
ENE
10
E
10
E
15
E
35
ENE
40
ENE
40
ENE
40
ENE
40
NE
40
ENE
35
ENE
30
ENE
25
E
25
ENE
25
ENE
25
ENE
Wind State
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
11:48AM0.51m
12:32PM0.55m
1:04PM0.58m
10:27PM0.27m
1:31PM0.61m
11:46PM0.30m
1:55PM0.63m
00:27AM0.33m
2:17PM0.65m
1:04AM0.37m
Low Tide
1:15AM0.09m
2:41AM0.09m
4:16AM0.08m
9:18PM0.23m
5:19AM0.05m
8:24PM0.22m
6:03AM0.02m
8:21PM0.21m
6:39AM-0.00m
8:32PM0.20m
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:11
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:57
6:55
6:54
6:53
6:53
6:52
 mm
1
1
2
2
3
Temp °C
25
26
26
26
26
27
26
26
26
25
25
25
25
26
26
26
26
26
26
Feels °C
25
29
28
29
29
30
28
25
24
23
22
22
22
24
25
26
26
25
26
  • Map Icons:
  • Break
  • 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 Waimanalo Surf forecast

The above surf forecast table for Waimanalo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waimanalo can be found by selecting the local surf guide option on the grey menu. Our Waimanalo 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 (Waimanalo) 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 Waimanalo 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.

Waimanalo is 7 km (4 miles) from Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.

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