Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 7 am 10 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 10 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 11PM (local time) - 8ft (2.4m), 11s period, ENE swell with 1,298 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 2.4m 11s and forecast to arrive on Sunday (Aug 16) at 11PM. Winds are predicted to be cross-offshore 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 (Sun 16th Aug)8ft (2.4m) 11s

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


The Lowdown

Alright, grab a coffee, let’s talk about what’s going on for Waimanalo. It’s a bit of a tough stretch ahead, to be honest. The surf is there, but the wind is just making a mess of things for most of this 16-day run. The water’s sitting at a warm 81°, which is pretty much normal for this time of year, so no surprises there.

We’re kicking off on Monday, 10 August, with a small 5ft swell from the ENE, but a howling 16 mph onshore wind from the NE is going to chop it up bad. The combined swell energy is weak (270), so it’s really not worth paddling out. This pattern of onshore wind and poor conditions just keeps rolling through the entire first week.

Tuesday and Wednesday are more of the same – waist-high slop, windblown, with period dropping to a short 6-7 seconds, making for lumpy, bumpy waves. Thursday the 13th, the swell bumps to 5ft, but the wind is still on it, and the period is still short. By Friday the 14th, we’re looking at 6ft, but it’s just a messy wall of whitewater.

The weekend of the 15th and 16th sees the swell building to 7ft and then 8ft, and the energy jumps way up – moderate at first (623), then strong on Sunday the 16th with a combined energy of 1072. Here’s where it gets interesting: Sunday the 16th, a rare cross-offshore wind from the SSE kicks in at 37 mph – that’s near gale force – but it’s blowing clean. The swell period is 10 seconds, so it’s got some groundswell push. That said, this is a big, powerful swell, and with the wind being that strong, it’s going to be wild, raw, and only for the most experienced. The afternoon session on Sunday is marginal at best due to the tide, but if you’re a charger, that morning window is the only real standout in the whole forecast.

After that, Monday the 17th drops a bit to 7ft, with a 10-second period, but the wind swings cross-shore. It’s still a bit choppy, and the score is low. Then the rest of the second week from Tuesday the 18th onward is a slow decline. The swell fades from 6ft down to 4ft, the period drops back to 6-7 seconds, and that onshore ENE wind comes roaring back at 16-22 mph. The energy dips to weak again (91 on the 20th). It’s a real gap of nothing to get excited about.

Honestly, this spot is a consistent wave producer, but the wind is just wrong for it for the vast majority of the period. If you have to go, the only window that looks half-decent is Sunday morning, 16 August, with that 8ft ENE groundswell and clean cross-offshore wind – but that is heavy, expert territory. Otherwise, the setup looks more interesting for kite surfing than paddle surfing for most of these days.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

Heavy rain (total 33mm), heaviest during Sat night. Warm (max 26°C on Thu morning, min 25°C on Thu night). Winds increasing (fresh winds from the NE on Thu afternoon, gales from the NNW by Sat night).

Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
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
1
3
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
ENE
8
1.3
ENE
8
1.2
E
8
1.3
E
7
1.2
ENE
7
1.3
E
7
1.3
ENE
6
1.3
ENE
7
1.7
E
6
1.5
ENE
6
1.7
ENE
6
1.8
ENE
7
1.9
ENE
7
1.9
ENE
8
2.2
ENE
8
2.1
ENE
9
2.1
ENE
9
2.4
ENE
9
2.3
ENE
10
2.3
ENE
10
2.3
ENE
11
Wave Graph
Metric surfscale
Energy kJ
232
196
163
176
160
176
143
152
239
176
233
317
355
385
514
616
761
958
1066
1087
1146
Wind (km/h)
25
NE
30
ENE
20
ENE
25
ENE
25
ENE
25
ENE
35
ENE
30
ENE
30
ENE
35
NE
35
ENE
35
ENE
35
NE
35
NE
35
NE
40
NE
40
NNE
70
NNW
60
SSE
40
SSE
25
SSE
Wind State
on
on
cross-on
cross-on
on
on
cross-on
on
cross-on
on
on
on
on
on
on
on
cross-on
cross-on
cross-off
cross-off
cross-off
High Tide
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
5:20AM0.44m
4:40PM0.52m
Low Tide
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
10:41AM0.19m
11:25PM0.08m
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
heavy 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
6:07
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:04
7:02
7:02
7:01
7:00
7:00
7:00
 mm
33
5
6
2
Temp °C
26
26
26
26
26
25
25
25
25
26
26
25
25
26
25
26
26
26
26
26
26
Feels °C
26
25
26
25
25
23
24
22
23
24
24
22
22
23
22
24
24
23
24
22
25
  • 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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