Surf Forecasts:
Waimanalo surf forecast from 5 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 5AM (local time) - 4.5ft (1.3m), 9s period, ENE swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 8PM (local time) - 7ft (2.2m), 14s period, ENE swell with 1,730 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 4.5ft (1.3m), 9s 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 Wednesday (Sep 09) at 5AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.7m and 13s. 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 2.2m 14s and forecast to arrive on Saturday (Sep 05) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Tuesday (Sep 08) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 9th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 5AM (Wed 9th Sep) | 4.5ft (1.3m) 9s |
| Most Powerful | 8PM (Sat 5th Sep) | 7ft (2.2m) 14s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let me break down the surf outlook for Waimanalo.
Right off the bat, I gotta be honest with you – the next two weeks look pretty grim. We've got a solid 16-day window, but the first few days are a total write-off. From Saturday, September 5th right through to the end of the first week, the conditions are just not there. The wind is howling from the ENE at 18.6 mph, blowing straight onshore, and it's making a mess of things. The swell is coming in at 7.2ft with a short period, and the combined energy is a strong 1725, but it's all for nothing with that wind. It's poor surf, full stop.
We don't see anything worth paddling out for until Tuesday, September 8th. Even then, it's only marginal. The surf will be around 6.6ft from the ENE with a period of 11 seconds, but the wind swings to the south, coming cross-offshore. That'll clean things up a bit. The energy is moderate (991). It's not a standout, but it's the best we've got in the first week. For a beginner break, this 6.6ft swell might be a bit much, and the water temp is 80.6°, which is about average for the time of year.
After that, it's back to poor conditions. There's a long stretch of onshore ENE winds and weak, short-period swell. The energy drops right off into the low hundreds. There's no real quality on offer for the rest of the forecast period. The second week is a total write-off with consistent onshore wind and tiny, weak swell. Honestly, nothing comes together. This is a bleak run.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun night. Warm (max 27°C on Mon night, min 25°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue afternoon. Warm (max 27°C on Tue morning, min 25°C on Thu morning). Mainly fresh winds. | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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 14 | ENE 13 | ENE 13 | ENE 12 | E 12 | ENE 12 | E 13 | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 13 | ENE 12 | ENE 12 | ENE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1705 | 1679 | 1430 | 1118 | 1155 | 1338 | 848 | 694 | 1200 | 991 | 732 | 370 | 207 | 206 | 191 | 236 | 167 | 229 | 656 | 603 | 460 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on |
High Tide | 11:56AM0.64m | 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 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | 1 | — | 2 | 12 | 3 | 3 | 1 | — | 1 | 2 | 1 | 2 | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 26 | 25 |
Feels °C | 25 | 25 | 24 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 29 | 30 | 29 | 27 | 24 | 24 | 25 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | ENE 13 | SSW 12 | SSW 12 | SW 14 | E 13 | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 8 | E 13 | E 12 | E 12 | E 12 | ENE 13 | SSW 16 | ENE 12 | ENE 11 |
| kJ | 184 | 177 | 1430 | 81 | 55 | 100 | 848 | 694 | 1200 | 991 | 732 | 370 | 207 | 166 | 110 | 104 | 106 | 229 | 26 | 603 | 460 |
Swell 2 Height (m) Direction Period (s) | NNE 10 | NNE 10 | S 12 | N 8 | E 16 | SSW 18 | SSW 14 | SW 14 | SW 14 | SSW 10 | E 14 | E 14 | E 13 | NW 10 | NW 10 | NW 9 | NW 9 | SSW 12 | S 12 | SSW 15 | SW 17 |
| kJ | 20 | 19 | 101 | 5 | 78 | 65 | 180 | 169 | 346 | 38 | 140 | 134 | 168 | 36 | 23 | 20 | 12 | 14 | 11 | 22 | 12 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | NNE 10 | NNE 8 | SSW 16 | SSW 19 | SSE 10 | SSW 17 | S 8 | S 8 | SSW 15 | SSW 15 | S 8 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | WNW 8 | NW 8 | SSW 12 | SW 15 |
| kJ | 29 | 32 | 13 | 25 | 35 | 20 | 93 | 33 | 82 | 74 | 72 | 34 | 66 | 36 | 34 | 33 | 32 | 7 | 2 | 13 | 8 |
Wind waves Height (m) Direction Period (s) | ENE 14 | ENE 13 | — | ENE 12 | E 12 | ENE 12 | ENE 6 | ENE 7 | — | SSE 7 | S 9 | — | — | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 12 | — | — |
| kJ | 1705 | 1679 | — | 1118 | 1155 | 1338 | 252 | 232 | — | 77 | 132 | — | — | 206 | 191 | 236 | 167 | 186 | 656 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 44 | 15 | 44 | 44 | 44 | 117 | 9 | 66 | 50 | 66 | 5 | 5 | 15 | 44 | 44 | 15 | 44 | 44 | 44 | 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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