Surf Forecasts:
Waimanalo surf forecast from 6 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 8PM (local time) - 5ft (1.6m), 10s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 11AM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,752 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 8PM (local time) - 5ft (1.6m), 10s 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 Tuesday (Sep 08) at 8PM. The primary swell is predicted to be 1.6m and 10s period with a secondary swell of 0.7m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Waimanalo in the next 16 days are 2.4m 13s and forecast to arrive on Monday (Sep 07) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Tuesday (Sep 08) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Tue 8th Sep) | 5ft (1.6m) 10s |
| Best Surf | 8PM (Tue 8th Sep) | 5ft (1.6m) 10s |
| Most Powerful | 11AM (Mon 7th Sep) | 8ft (2.4m) 13s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's talk about what's cookin' at Waimanalo over the next couple of weeks. I gotta be straight with you, the outlook is pretty grim for a paddle session. The first few days are a write-off.
We're looking at a real flat spell to start. From Sunday, September 6th, right through to Thursday, September 10th, it's all poor surf conditions. The wind is howling out of the east-northeast at 15 to 19 mph, mostly cross-onshore, just chopping everything up. The swell is all short-period windswell, with periods around 7 to 12 seconds, and energy readings are strong but messy, like 1392 on Sunday morning. Not a wave worth paddling for.
Tuesday, September 8th, actually shows a bit of a glimmer. The wind swings south, giving us a clean, cross-off breeze. The swell is around 6 ft to 6 ft from the east-northeast, with a period of 10-11 seconds. It’s a marginal call, energy's still moderate at 885. The problem is, Waimanalo is exposed to swell from the NE and the optimum direction is NE, so this ENE swell is a bit off-angle. It might be worth a look for the die-hards, but I wouldn't bet the farm on it.
From Wednesday, September 9th, we go back into the doldrums. Small, weak, short-period junk. The swell drops below 5 ft, periods tumble to 7-8 seconds, and the wind is back on it. The energy readings drop to the 300s and 200s, which is just weak. For the next ten days or so, it’s a whole lot of nothing. The waves are too small and weak for any real surfing.
Honestly, the only bright spot is that Tuesday the 8th, and even that's a stretch. For a beginner spot, the swell on Tuesday is over 5 ft, which could be a bit much, but with clean conditions it might be okay. But for most of us, this setup looks more interesting for kite surfing than paddle surfing. The wind is consistent and the waves are small and messy.
There's a big gap of poor surf from the 9th right through to the end of the forecast on the 21st. We see a few days of onshore wind and small swell. Nothing to get excited about. I'll keep an eye on it, but right now, save your energy.
Rusty.
Short Range ForecastHeavy rain (total 25mm), heaviest during Sun night. Warm (max 27°C on Tue morning, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Warm (max 27°C on Tue night, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | ENE 13 | ENE 12 | E 12 | E 12 | ENE 13 | E 12 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | E 13 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 12 | ENE 12 | ENE 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 1605 | 1382 | 1269 | 657 | 1752 | 773 | 1160 | 885 | 625 | 305 | 169 | 196 | 199 | 236 | 186 | 173 | 530 | 612 | 531 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on |
High Tide | 12:39PM0.68m | 11:21PM0.29m | 1:14PM0.70m | 00:23AM0.35m | 1:44PM0.70m | 1:12AM0.41m | 2:10PM0.68m | 1:57AM0.46m | 2:33PM0.65m | 2:42AM0.50m | 2:52PM0.60m | 3:26AM0.53m | |||||||
Low Tide | 4:19AM0.02m | 8:00PM0.22m | 5:27AM-0.01m | 7:55PM0.20m | 6:20AM-0.02m | 8:07PM0.17m | 7:05AM-0.01m | 8:24PM0.14m | 7:47AM0.03m | 8:43PM0.10m | 8:28AM0.08m | 9:04PM0.07m | |||||||
 |  |  |  | | | | | | |  |  |  | | | |  | |  | |
 | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:43 | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — |
mm | 1 | — | 2 | 11 | 3 | 4 | 1 | 1 | 2 | 1 | — | 1 | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 26 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 26 | 25 | 26 | 25 | 26 | 26 | 27 | 28 | 30 | 29 | 29 | 28 | 26 | 26 | 24 | 23 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | SSW 12 | E 12 | SW 14 | E 12 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | E 13 | E 12 | E 12 | E 12 | E 11 | SSW 16 | SSW 15 | SW 17 |
| kJ | 101 | 72 | 86 | 657 | 162 | 773 | 1160 | 885 | 625 | 305 | 169 | 123 | 108 | 104 | 101 | 94 | 26 | 22 | 12 |
Swell 2 Height (m) Direction Period (s) | N 9 | SSW 16 | E 16 | SSW 12 | S 8 | SW 15 | SW 14 | SSW 15 | E 14 | E 13 | E 13 | NW 10 | NW 10 | NW 9 | NW 9 | NW 8 | NW 8 | S 12 | SW 15 |
| kJ | 14 | 50 | 78 | 56 | 33 | 255 | 336 | 74 | 140 | 176 | 168 | 68 | 60 | 29 | 27 | 11 | 2 | 11 | 8 |
Swell 3 Height (m) Direction Period (s) | SSE 10 | N 8 | SSW 19 | SSW 18 | SSW 17 | S 8 | S 15 | WSW 11 | SSW 15 | S 8 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | ENE 13 | SSW 12 | NW 8 | S 12 |
| kJ | 11 | 10 | 35 | 65 | 92 | 48 | 119 | 24 | 72 | 33 | 65 | 36 | 34 | 33 | 31 | 18 | 14 | 2 | 3 |
Wind waves Height (m) Direction Period (s) | ENE 13 | ENE 12 | E 12 | ENE 7 | ENE 13 | ENE 6 | S 8 | S 10 | S 9 | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 12 | ENE 12 | ENE 11 |
| kJ | 1605 | 1382 | 1269 | 247 | 1752 | 176 | 64 | 225 | 126 | — | — | 196 | 199 | 236 | 186 | 173 | 530 | 612 | 531 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 44 | 44 | 44 | 120 | 48 | 66 | 50 | 5 | 0 | 5 | 15 | 15 | 44 | 17 | 15 | 15 | 17 | 44 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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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