Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 1 am 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Waimanalo sea temperature is
27.0° C
0.4° 

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


Waimanalo surf forecast from 11 Aug 2026:

  • Most powerful swell: Monday 17 Aug, 11PM (local time) - 13ft (4.0m), 11s period, NE swell with 3,542 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 4.0m 11s and forecast to arrive on Monday (Aug 17) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Thursday (Aug 13) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Mon 17th Aug)13ft (4.0m) 11s

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


The Lowdown

Alright folks, Rusty here. Let's break down what's on the table for this stretch of the Oahu coast. Honestly, it's a bit of a rough patch for a while. We've got a solid run of days where the wind is just nasty, blowing straight onshore or cross-on, keeping things blown out and messy. You're looking at a long stretch of poor conditions from the get-go, all the way through the 16th of August. The first real chance of anything half-decent doesn't show up until Monday the 17th.

So, the only standout in this whole 16-day window is Waimanalo. The first glimmer of hope comes late on Monday, August 17th. That morning, we see a 8 ft swell from the ENE, but it's still a bit rough with a strong breeze. The real moment is the afternoon of the 17th. The wind swings to the SSE, giving us a cross-offshore breeze, cleaning things right up. The swell is still a solid 8 ft from the ENE, with a period of 10 seconds, and the combined energy is strong at 1210. This is a big, powerful groundswell. For a beach break like Waimanalo, that long period (over 11 seconds during the morning) can make it break a little straight, but the afternoon drop to 10 seconds and that clean wind should help it shape up. This is expert territory though – 8 ft is proper, and the energy is significant. You'll have to share the water as crowds are sometimes there.

The next day, Tuesday the 18th, is still worth a paddle. The morning offers a 7 ft swell from the NE with a gentle cross-shore breeze, which is a nice step down in size but still has moderate energy (595). It's a gentler day, but much more manageable. After that, it's back to the grind with onshore winds and poor surf for the rest of the forecast window. If you're not an experienced surfer, this whole period is a write-off – the 8 ft+ days are too big, and the smaller days are blown out. For the crew with bigger boards and a hunger, target that Monday afternoon, August 17th. It's your best bet, and it's a clean one.

Stay salty.
Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Tue morning, min 25°C on Tue night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 15mm), heaviest on Sun night. Warm (max 26°C on Fri morning, min 25°C on Fri morning). Winds increasing (fresh winds from the ENE on Fri morning, near gales from the NE by Sun night).

Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
AM
PM
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
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)
1.4
E
7
1.2
ENE
7
1.4
E
7
1.4
ENE
6
1.5
ENE
6
1.6
ENE
6
1.5
ENE
6
1.6
ENE
6
1.9
ENE
7
1.8
ENE
7
1.8
ENE
8
2
ENE
8
1.8
ENE
9
2.1
ENE
10
2.5
ENE
11
2.4
ENE
11
2.5
ENE
11
2.5
ENE
11
3
ENE
12
3.5
NE
12
3.5
NNE
10
Wave Graph
Metric surfscale
Energy kJ
203
160
171
165
160
218
176
188
307
321
375
498
513
934
1532
1347
1369
1624
2441
3233
2498
Wind (km/h)
25
E
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
NE
35
ENE
35
ENE
35
ENE
35
NE
40
NE
40
NE
40
NE
40
NE
50
NNE
45
ENE
30
E
25
E
20
E
Wind State
cross-on
on
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
High Tide
2:50PM0.74m
1:43AM0.37m
3:21PM0.72m
2:36AM0.40m
3:49PM0.69m
3:28AM0.42m
4:12PM0.63m
4:22AM0.43m
4:30PM0.58m
5:20AM0.44m
4:40PM0.52m
6:27AM0.44m
4:40PM0.47m
Low Tide
9:16PM0.20m
7:57AM-0.08m
9:41PM0.17m
8:39AM-0.03m
10:07PM0.14m
9:20AM0.03m
10:33PM0.12m
10:00AM0.11m
10:59PM0.09m
10:41AM0.19m
11:25PM0.08m
11:25AM0.27m
11:52PM0.07m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
clear
cloud
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:07
6:07
6:07
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:02
7:01
7:00
7:00
7:00
6:59
 mm
2
1
2
10
5
3
2
Temp °C
26
26
25
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
Feels °C
26
25
23
24
24
24
24
23
24
23
23
24
24
24
24
23
23
20
26
27
27
  • 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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