
Surf Forecasts:
Waimanalo surf forecast from 14 Sep 2026:
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 7ft (2.1m), 9s period, ENE swell with 647 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.1m 9s and forecast to arrive on Friday (Sep 18) 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 0.4m 18s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Fri 18th Sep) | 7ft (2.1m) 9s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Hey, Rusty again. Let's cut through it. The surf outlook for Waimanalo over the next couple of weeks is pretty grim. The wind is the problem, blowing hard and onshore for most of the run, just wrecking the waves. Water temp is around 81°F, pretty normal for this time of year, so no worries there.
We start Monday, September 14th, and you can stay on the beach. There's a weak NE windswell of 3ft to 4ft from the NE, with a short period of 8 seconds and low energy (112-153). The wind is onshore from the ENE at 12 mph, making it a mess. That's the story for the whole first week. The swell picks up, but so does the wind. By Wednesday the 16th, we've got 4ft to 5ft from the ENE, but it's still a junky period (6 seconds) and the onshore wind is a fresh 19 mph. Energy climbs into the moderate range (206), but the quality is zero. Thursday the 17th sees the swell hit 7ft from the ENE with moderate energy (416-603), but it's all slop under a fresh breeze. Even when the swell jumps to 7ft from the E on Wednesday the 23rd, with a much longer period of 11 seconds and very strong energy (1052), the wind is still howling onshore at 19 mph. That's just raw, blown-out power for experts only.
There's one small window. The morning of Sunday, September 27th shows a new pulse of 4ft swell from the north with a solid 10-second period and moderate energy (441). The wind is only a light breeze at 6 mph from the north, giving us a cross-onshore flow. It's still not glassy, but it's the most surfable it's going to get in this entire forecast. It's a marginal call, but that's your best bet. The rest of that week stays small and mostly poor.
So, your best option? That Sunday the 27th morning session is the only one that looks even close to worthwhile. The rest of this 16-day run is largely a write-off. A huge chunk of the first two weeks is just blown-out slop. With the wind so strong and the surf messy, the beach might be more interesting for kite surfing than paddle surfing.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 25°C on Mon morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Thu night. Warm (max 27°C on Fri morning, min 25°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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) | NE 8 | NE 8 | ENE 5 | NNE 8 | NNE 8 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 8 | E 7 | E 8 | ENE 7 | ENE 8 |
Wave Graph | |||||||||||||||||||||
82 | 149 | 58 | 46 | 52 | 69 | 93 | 119 | 176 | 412 | 603 | 647 | 461 | 461 | 453 | 464 | 437 | 404 | 377 | 355 | 375 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:24PM0.45m | 5:47AM0.53m | 3:20PM0.41m | 6:53AM0.51m | 2:37PM0.40m | 8:54AM0.49m | 10:52AM0.51m | 11:47AM0.54m | 12:22PM0.57m | 11:21PM0.27m | |||||||||||
Low Tide | 10:35AM0.25m | 10:11PM0.03m | 11:26AM0.30m | 10:35PM0.05m | 12:57PM0.34m | 11:02PM0.07m | 11:41PM0.10m | 1:18AM0.13m | 3:40AM0.12m | 7:51PM0.20m | 4:53AM0.10m | ||||||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 2 | 14 | — | — | 3 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 24 | 25 | 24 | 24 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 8 | SSW 22 | NE 8 | NNE 8 | NNE 8 | NNE 8 | E 10 | E 10 | E 10 | SSW 16 | SSW 19 | SSW 18 | SSW 17 | SW 17 | SSW 15 | SSW 16 | S 18 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
82 | 45 | 31 | 39 | 52 | 37 | 51 | 73 | 96 | 25 | 35 | 124 | 116 | 71 | 44 | 47 | 24 | 86 | 78 | 73 | 70 | |
Swell 2 Height (m) Direction Period (s) | NNE 6 | SW 14 | E 13 | E 12 | E 12 | E 11 | SW 18 | SW 18 | SW 17 | SSW 19 | SSW 16 | SE 10 | S 10 | SSE 8 | SSW 16 | S 18 | SSW 16 | S 13 | S 8 | NW 9 | NW 8 |
6 | 8 | 14 | 26 | 44 | 37 | 80 | 79 | 76 | 37 | 24 | 4 | 2 | 6 | 26 | 25 | 24 | 3 | 1 | 3 | 3 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | E 15 | NNE 10 | SW 20 | SSW 20 | SW 19 | N 10 | NNE 8 | S 11 | SE 11 | S 10 | NW 12 | NW 10 | S 21 | S 19 | SSE 7 | SSW 14 | SW 15 | NW 9 | S 7 | N 11 |
8 | 4 | 9 | 60 | 37 | 95 | 7 | 14 | 2 | 4 | 2 | 6 | 4 | 9 | 29 | 5 | 20 | 8 | 3 | 1 | 2 | |
Wind waves Height (m) Direction Period (s) | ENE 5 | NE 8 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 8 | E 7 | E 8 | ENE 7 | ENE 8 |
24 | 149 | 58 | 46 | 44 | 69 | 93 | 119 | 176 | 412 | 603 | 647 | 461 | 461 | 453 | 464 | 437 | 404 | 377 | 355 | 375 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 15 | 15 | 15 | 17 | 17 | 44 | 116 | 44 | 44 | 44 | 15 | 44 | 44 | 15 | 55 | 50 | 44 | 45 | 50 | 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.










