Surf Forecasts:
Waimanalo surf forecast from 9 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Tuesday 8 Sep, 5PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with 724 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5PM (local time) - 5.5ft (1.7m), 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 Tuesday (Sep 08) at 5PM. The primary swell is predicted to be 1.7m and 11s period with a secondary swell of 0.5m and 14s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Waimanalo in the next 16 days are 1.7m 11s and forecast to arrive on Tuesday (Sep 08) at 5PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 9s period and expected on Tuesday (Sep 08) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Best Surf | 5PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Most Powerful | 5PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. We’ve got a 16-day look at the surf, and I’m gonna be straight with you – the first real window of opportunity is a short one, right at the start. After that, things get messy for a long stretch.
Let’s kick it off with Waimanalo. This spot is a beginner-friendly, fairly consistent beach break exposed to the open ocean. The water temperature is sitting at 80°, which is bang on average for the time of year, so no surprises there.
The best of the bunch is Tuesday, September 8th. The morning starts with rain showers, but don’t let that fool you. We’ve got a solid 6ft swell pulsing in from the ENE with a period of 11 seconds, giving it some real push (combined swell energy is 799, moderate). The wind is a fresh offshore from the SSW at 22 mph, meaning clean, lined-up waves. The afternoon cleans up even more. The wind drops to a moderate offshore from the SW at 16 mph, and the swell settles a touch to 6ft from the ENE (combined energy 821, moderate). That afternoon session is the standout – expect very good, clean conditions. The waves are a bit too big for absolute beginners, but fine for anyone with a little experience. The crowds can be an issue here sometimes, so get out early or late.
Then it all goes quiet. From Wednesday, September 9th, the wind swings onshore and the quality nosedives. We’re looking at a long gap of poor conditions that stretches all the way through to the end of the forecast window. The wind is relentless from the ENE and NE, mostly onshore or cross-onshore, creating choppy, lumpy, and messy surf. The swell sticks around, sometimes getting bigger, like on September 17th when it hits 7ft from the E (combined energy 707, moderate), but with strong cross-onshore winds at 25 mph, that’s just a washing machine. It’s honestly more interesting for kite surfing than paddle surfing on those days. The wave period drops into the short, weak range too, so there’s no real power to the lines.
The bottom line: Tuesday is your day. The rest looks like a write-off for a solid week and a half. It’s a tough run, but that’s the way it goes sometimes.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Wed night. Warm (max 28°C on Tue afternoon, min 25°C on Thu night). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed morning). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sun night. Warm (max 26°C on Fri afternoon, min 25°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
AM | PM | 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 11 | ENE 11 | ENE 10 | ENE 9 | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 11 | E 10 | ENE 10 | ENE 10 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 785 | 724 | 378 | 211 | 168 | 237 | 273 | 258 | 158 | 97 | 297 | 265 | 160 | 125 | 94 | 107 | 107 | 88 | 84 | 69 | 53 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | on | on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | on | cross-on |
High Tide | 1:44PM0.70m | 1:12AM0.41m | 2:10PM0.68m | 1:57AM0.46m | 2:33PM0.65m | 2:42AM0.50m | 2:52PM0.60m | 3:26AM0.53m | 3:07PM0.55m | 4:11AM0.55m | 3:19PM0.50m | 4:57AM0.55m | 3:24PM0.45m | ||||||||
Low Tide | 8:07PM0.17m | 7:05AM-0.01m | 8:24PM0.14m | 7:47AM0.03m | 8:43PM0.10m | 8:28AM0.08m | 9:04PM0.07m | 9:09AM0.14m | 9:26PM0.05m | 9:50AM0.20m | 9:48PM0.03m | 10:35AM0.25m | 10:11PM0.03m | ||||||||
 |  |  |  | |  | | |  | | | | | | | | |  | | | | |
 | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — |
mm | 2 | — | — | — | — | 5 | 1 | — | — | — | — | — | — | — | — | — | — | 4 | — | — | 3 |
Temp °C | 27 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 26 | 28 | 30 | 30 | 28 | 29 | 26 | 26 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 27 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | E 13 | E 12 | E 12 | E 11 | E 11 | NNE 8 | NNE 8 | ENE 10 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 |
| kJ | 785 | 724 | 378 | 211 | 140 | 117 | 104 | 72 | 94 | 89 | 50 | 50 | 160 | 96 | 94 | 107 | 107 | 88 | 84 | 69 | 53 |
Swell 2 Height (m) Direction Period (s) | SSW 15 | E 14 | E 14 | E 13 | E 13 | NW 10 | NW 9 | NW 9 | SSW 12 | NNE 8 | SSW 15 | SSW 12 | NE 8 | SW 16 | E 5 | ENE 9 | ENE 8 | ENE 8 | ESE 8 | SSW 22 | ESE 7 |
| kJ | 75 | 97 | 132 | 168 | 168 | 58 | 28 | 20 | 14 | 56 | 22 | 13 | 70 | 10 | 17 | 26 | 14 | 6 | 7 | 45 | 9 |
Swell 3 Height (m) Direction Period (s) | NNW 12 | SSW 15 | NW 9 | NW 9 | NW 8 | SSW 13 | SSW 13 | SSW 13 | NW 8 | SSW 16 | NW 9 | SSW 17 | SSW 16 | SW 13 | ENE 9 | SSW 15 | SW 15 | SSW 14 | SW 14 | SW 14 | SW 21 |
| kJ | 14 | 73 | 52 | 61 | 57 | 34 | 33 | 32 | 10 | 26 | 3 | 29 | 24 | 7 | 46 | 21 | 8 | 20 | 8 | 8 | 18 |
Wind waves Height (m) Direction Period (s) | S 10 | S 9 | — | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 11 | E 10 | — | ENE 10 | — | E 6 | E 6 | E 5 | E 5 | E 5 | ENE 5 |
| kJ | 408 | 150 | — | — | — | 237 | 273 | 258 | 158 | 97 | 297 | 265 | — | 125 | — | 44 | 67 | 34 | 25 | 22 | 34 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 131 | 0 | 0 | 9 | 15 | 9 | 44 | 18 | 15 | 15 | 15 | 26 | 44 | 15 | 15 | 42 | 15 | 15 | 15 | 15 | 15 |
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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