Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 7 am 21 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 21 Aug 2026:

  • Most powerful swell: Sunday 23 Aug, 2AM (local time) - 6.5ft (2.0m), 7s period, E swell with 393 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 2.0m 7s and forecast to arrive on Sunday (Aug 23) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 17s period and expected on Thursday (Aug 27) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sun 23rd Aug)6.5ft (2.0m) 7s

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


The Lowdown

Alright, Rusty here again, giving you the same outlook but in feet and miles per hour for the metric-averse.

So, Waimanalo is in for a tough stretch. The surf is there, but the wind is going to be a constant headache.

Starting Friday, August 21st, we’ve got a small 4ft swell from the NE, but it’s a short-period, 7-second wind swell. The wind is blowing across from the east at 10 mph, making things choppy. The water is about 80°F, which is average for the time of year. The wave energy is weak, at 109. Not worth getting wet.

This pattern sticks around for days. From Saturday, August 22nd, through the end of the month, the swell picks up to 5ft–6ft, but the wind is a fresh to strong breeze from the ENE, 22 to 25 mph. It’s onshore, the period stays short at 6–7 seconds, and the wave energy climbs to 342 on Sunday. It’s messy, lumpy, and sloppy. If you’re a kite surfer, this might be fun, but for paddle surfing, it’s a washout.

Then we hit the end of August and the first few days of September, and things get weird. The swell drops to 3ft, but the period jumps way up to 13–14 seconds. That’s a long-period groundswell with good energy (over 500), but it’s still coming from the east, and the wind is still on it. A long-period swell like this works better at a point break or reef, not a beach break like Waimanalo.

The only real standout is the last day, Saturday, September 5th. The swell is 5ft from the ENE, with a solid 11–12 second period. The wind finally eases to a light breeze, 9 mph. It’s still cross-onshore, but it’s glassy enough to be rideable. The wave energy is moderate at 485–559. This is the best on offer, but it’s a long way out, so keep an eye on it.

For the experts, there’s a massive swell spike on August 31st and September 1st, with 10ft to 12ft from the ENE, but the wind is a strong onshore breeze (22–31 mph), and the period is short (9–10 seconds). That’s going to be a messy, dangerous washout, only for the very skilled.

So, bottom line: we’ve got a long stretch of poor surf from the 21st through to the 4th of September. The only flicker of hope is that Saturday morning, the 5th of September. It’s not a guarantee, but it’s the closest thing to a green light we’ve got.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Sat night). Winds increasing (calm on Fri morning, strong winds from the ENE by Sat night).

Days 4-6 Weather Summary

Some drizzle, heaviest during Mon morning. Warm (max 26°C on Mon morning, min 25°C on Mon morning). Mainly fresh winds.

Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
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)
1.1
NE
7
1.2
ENE
7
1.5
ENE
7
1.5
E
7
1.7
E
7
2
E
7
1.9
ENE
7
1.7
ENE
6
1.7
E
6
1.5
ENE
6
1.6
ENE
6
1.7
E
6
1.8
E
7
1.7
E
7
1.7
ENE
6
1.6
ENE
6
1.4
ENE
6
1.4
ENE
6
1.1
ENE
7
1.2
ENE
5
0.5
E
16
Wave Graph
Metric surfscale
Energy kJ
109
127
181
212
278
393
352
245
225
135
198
239
311
270
253
218
153
135
114
72
127
Wind (km/h)
10
ENE
20
ENE
20
E
35
ENE
40
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
Wind State
cross-on
on
cross-on
cross-on
on
cross-on
cross-on
on
on
cross-on
on
on
cross-on
on
cross-on
cross-on
on
cross-on
cross-on
on
cross-on
High Tide
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
2:38PM0.65m
1:42AM0.40m
2:57PM0.65m
2:22AM0.43m
Low Tide
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
7:12AM-0.01m
8:49PM0.18m
7:45AM-0.00m
9:08PM0.15m
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
rain showers
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:11
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:54
6:53
6:53
6:52
6:52
6:51
 mm
1
Temp °C
26
27
26
26
26
25
26
26
25
26
26
26
26
26
25
25
25
25
25
25
25
Feels °C
30
29
27
26
25
23
25
24
23
25
25
26
25
24
23
22
23
23
24
23
24
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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