Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 1 pm 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Waimanalo sea temperature is
26.9° 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 10 Aug 2026:

  • Best quality surf: Sunday 16 Aug, 8PM (local time) - 11ft (3.5m), 11s period, ENE swell with cross-shore winds.
  • Most powerful swell: Sunday 16 Aug, 5PM (local time) - 18ft (5.5m), 13s period, NE swell with 9,015 kJ wave energy.
  • Next surfable swell (1★+): Sunday 16 Aug, 8PM (local time) - 11ft (3.5m), 11s period with ENE swell.

Best Forecast Surf Conditions for Waimanalo this week:

The surf forecast for Waimanalo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 16) at 8PM. The primary swell is predicted to be 3.5m and 11s period with a secondary swell of 3.0m and 9s. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Waimanalo in the next 16 days are 5.5m 13s and forecast to arrive on Sunday (Aug 16) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 13s period and expected on Sunday (Aug 16) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 16th Aug)11ft (3.5m) 11s
Best Surf 8PM (Sun 16th Aug)11ft (3.5m) 11s
Most Powerful 5PM (Sun 16th Aug)18ft (5.5m) 13s

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


The Lowdown

G’day, Rusty here. Alright, let’s get straight into it. The next couple of weeks look pretty grim for a proper paddle session at Waimanalo. We’ve got a long stretch of onshore wind and messy conditions that’ll keep the surf pretty ordinary for the most part. There is a brief glimmer of hope right at the end of the first week, but you’ll need to wait for it.

The water’s sitting at 80°, which is about average for this time of year, so no surprises there.

We kick off Sunday, August 9, and things are ugly right out of the gate. A fresh 19 mph ENE wind is blowing straight onshore, and we’ve got a weak 5 ft swell from the ENE with a short 8-second period. The combined energy is weak at 296, and the wave comment says it all: poor surf conditions. This continues through the whole first week. Monday through Sunday, August 10 to 16, it’s more of the same – onshore winds from the ENE and NE, mostly fresh breezes, and the swell stays in the 4 ft to 6 ft range, with periods as low as 6 seconds. The energy builds a bit by Friday the 14th (392 on Friday morning, 453 in the afternoon), but the wind and chop ruin it. Saturday the 15th sees a jump in size to 10 ft, and the period stretches to 12-13 seconds, pushing the combined energy into the strong range (2166 and 3408). But that ENE onshore wind is still howling at 22 mph, so it’s a complete mess. Sunday the 16th is the biggest, with 15 ft to 18 ft swell and a very long 13-second period, energy hitting 6425 and 9015 – massive power, but the wind is cross-onshore from the N and NNW. For a beach break like Waimanalo, this setup is more interesting for kite surfing than paddle surfing. It’s only for experts anyway, given the size.

Now, the standout. It’s the only window worth mentioning. Monday, August 17, brings a change. A light offshore wind from the SW at just 3 mph in the morning, and the swell drops to a much more manageable 7 ft from the ENE with a 9-second period. The combined energy is a moderate 616, and the wave comment says expect very good surf conditions. That’s a clean, glassy morning with proper shape. The swell direction is ENE, which is about as good as it gets for Waimanalo’s optimum. Keep in mind, with crowds marked as “sometimes,” you might have a few others with the same idea. The afternoon sees a shift to a cross-offshore SSW breeze at 12 mph, and the surf drops to 6 ft – still clean, but more marginal on the tide. After that, it’s back to onshore junk from Tuesday the 18th through to the end of the forecast, with the only brief exception being a gentle cross-shore on Tuesday morning that’s still marginal.

So, the long and short of it: the first week is a write-off. The best and only real chance to get wet is the morning of Monday, August 17. Get on it if you can. Promising, but you’ll have to wait.

Rusty

Short Range Forecast

Mostly dry. Warm (max 26°C on Sun afternoon, min 25°C on Sun afternoon). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Thu morning, min 25°C on Wed afternoon). Mainly fresh winds.

Sun
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
ENE
8
1.7
ENE
7
1.3
ENE
8
1.5
ENE
8
1.4
ENE
7
1.4
ENE
7
1.3
ENE
7
1.3
ENE
6
1.4
ENE
6
1.3
ENE
6
1.4
ENE
6
1.5
ENE
6
1.7
ENE
6
1.9
ENE
7
1.9
ENE
7
1.6
ENE
7
2.3
ENE
10
3
ENE
12
3
ENE
13
3.5
ENE
13
Wave Graph
Metric surfscale
Energy kJ
273
293
202
253
214
208
186
143
165
143
155
167
226
326
387
279
979
2160
3397
4536
Wind (km/h)
30
ENE
30
ENE
25
NE
30
ENE
20
ENE
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
NE
35
NE
35
NE
20
NNE
Wind State
on
cross-on
on
on
cross-on
cross-on
on
cross-on
cross-on
on
on
on
on
on
on
on
on
on
on
on
High Tide
11:41PM0.30m
2:17PM0.74m
00:48AM0.34m
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
Low Tide
8:45PM0.24m
6:24AM-0.09m
8:55PM0.22m
7:12AM-0.10m
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
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:07
6:07
6:07
6:07
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:05
7:04
7:02
7:02
7:01
7:00
7:00
 mm
1
Temp °C
26
25
26
26
26
26
26
25
25
25
25
26
26
25
25
26
26
26
26
25
Feels °C
25
24
26
25
26
25
25
24
24
23
23
24
24
23
22
23
24
23
24
23
  • Map Icons:
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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 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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