
Surf Forecasts:
Waimanalo surf forecast from 13 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8PM (local time) - 7.5ft (2.3m), 9s period, ENE swell with 791 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.3m 9s and forecast to arrive on Thursday (Sep 17) at 8PM. 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 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 17th Sep) | 7.5ft (2.3m) 9s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, crew, Rusty here. We’re looking at a long stretch ahead for Waimanalo, and the truth is, the ocean's not really cooperating. The entire 16-day forecast window is filled with surf that's just not up to scratch, so we’re starting with a blank. It's a big gap with nothing good on offer. The wind is mostly coming from the ENE and NE, and it's a constant onshore wind, which just ruins the shape.
Right off the bat, Sunday morning the 13th, the water temp is sittin' at a toasty 81°, which is pretty much dead average for this time of year, nothin' special. We've got some small 3-foot swell from the NNE, but the period is a short 9 seconds and the wind is onshore, making for poor surf. The combined energy is weak (216). It's a no-go.
Monday the 14th: same story. 3 to 4 feet from the NE, period dropping to 8 seconds. Still onshore wind.
Tuesday the 15th: swell drops to 2 feet, period 8 seconds. No good.
Wednesday the 16th: the swell picks up a bit to 4 feet from the ENE, but the period plummets to 6 seconds. That's just windswell, choppy and weak. The wind is a fresh 22 mph onshore. Not a single thing to recommend.
Thursday the 17th: swell pushes up to 7 feet from the ENE, period a measly 7 seconds, but the combined energy jumps to moderate (407). Still, with the onshore wind blowing 22 mph, it’s messy. This is getting into the size that’s too much for beginners and not clean for anyone else.
Friday the 18th through Sunday the 20th: we see a consistent 7 feet swell from the E, period still only 8 seconds. The wind is a stiff onshore breeze, making for lumpy, choppy conditions. The combined energy is strong (500+), but the quality is poor.
Monday the 21st through Tuesday the 23rd: the swell stays around 5 to 7 feet, with the period finally stretching a bit – from 8 to 11 seconds on Tuesday afternoon. The combined energy gets strong (582 on Tuesday, even strong to very strong at 1168 on Wednesday morning), but the wind never lets up. It’s onshore and will keep things rough.
Wednesday the 23rd: there’s a risk of thunderstorms on top of it all. The combined energy is strong to very strong (1168), and that’s a 7-foot groundswell from the E, but the period at 11 seconds is still not long enough to overcome the wind.
Thursday the 24th: swell maxes out at 8 feet from the ENE with period 9 seconds, and the wind goes cross-onshore with a strong breeze. It’s going to be messy and big. This is expert-only territory, and with the wind, it’s not the kind of clean, powerful wave we want.
From the 25th through the 28th: the swell stays in the 4 to 8 feet range, period varies from 7 to 11 seconds. The wind is persistently from the ENE and cross-onshore, keeping everything lumpy and choppy.
In short, every single time slot is rated as poor surf conditions. There’s no standout, no hidden gem, nothin’. Even the few times the swell gets some size and period, the onshore wind kills it. For a beach break like Waimanalo, with this much onshore wind, the setup might be more interesting for kite surfing than paddle surfing. We're in a real dry spell. Don't hold your breath; forecasts can change, but right now, it's a long wait.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 25°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu night. Warm (max 27°C on Fri afternoon, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NNE 8 | NNE 8 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 7 | E 7 | ENE 8 |
Wave Graph | |||||||||||||||||||||
138 | 112 | 123 | 82 | 69 | 51 | 40 | 52 | 78 | 111 | 154 | 253 | 545 | 690 | 717 | 644 | 545 | 518 | 427 | 400 | 427 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:19PM0.50m | 4:57AM0.55m | 3:24PM0.45m | 5:47AM0.53m | 3:20PM0.41m | 6:53AM0.51m | 2:37PM0.40m | 8:54AM0.49m | 10:52AM0.51m | 11:47AM0.54m | |||||||||||
Low Tide | 9:50AM0.20m | 9:48PM0.03m | 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 | ||||||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 8 | 1 | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 25 | 25 | 24 | 26 | 25 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NNE 8 | NNE 8 | NNE 8 | E 10 | E 10 | E 10 | SSW 16 | SSW 16 | SSW 18 | SSW 17 | SW 17 | SSE 8 | SSW 16 | SW 16 | SSW 16 |
138 | 112 | 123 | 82 | 69 | 51 | 39 | 52 | 37 | 51 | 72 | 98 | 25 | 25 | 124 | 116 | 71 | 11 | 47 | 62 | 86 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SW 15 | SSW 14 | SW 14 | SSW 22 | NNE 10 | E 12 | E 12 | E 11 | SW 18 | SW 18 | SW 17 | SSW 19 | SSW 19 | S 10 | NW 11 | SSE 8 | SSW 15 | SSE 8 | SSE 8 | SSE 8 |
21 | 8 | 20 | 8 | 45 | 9 | 26 | 44 | 37 | 80 | 79 | 76 | 37 | 36 | 2 | 4 | 7 | 44 | 14 | 11 | 6 | |
Swell 3 Height (m) Direction Period (s) | SW 12 | NW 13 | NW 12 | SE 8 | SW 14 | E 13 | SW 20 | SSW 20 | SW 19 | NNE 10 | NNE 9 | SW 11 | S 11 | S 10 | NW 12 | S 10 | S 21 | SSW 16 | S 18 | S 18 | S 13 |
6 | 7 | 6 | 2 | 8 | 14 | 60 | 37 | 95 | 9 | 8 | 5 | 2 | 2 | 6 | 2 | 9 | 26 | 25 | 25 | 3 | |
Wind waves Height (m) Direction Period (s) | E 9 | E 9 | E 4 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 7 | E 7 | ENE 8 |
78 | 55 | 11 | 27 | 33 | 38 | 40 | 37 | 78 | 111 | 154 | 253 | 545 | 690 | 717 | 644 | 545 | 518 | 427 | 400 | 427 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 15 | 17 | 44 | 15 | 15 | 15 | 17 | 15 | 44 | 116 | 44 | 116 | 52 | 45 | 50 | 52 | 44 | 50 | 45 | 45 |
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.










