Surf Forecasts:
Waimanalo surf forecast from 6 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 8PM (local time) - 5.5ft (1.7m), 10s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 11AM (local time) - 8ft (2.5m), 13s period, ENE swell with 1,901 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 8PM (local time) - 5.5ft (1.7m), 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 1.7m and 10s period. 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 2.5m 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 1.4m 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) | 5.5ft (1.7m) 10s |
| Best Surf | 8PM (Tue 8th Sep) | 5.5ft (1.7m) 10s |
| Most Powerful | 11AM (Mon 7th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on offer for the next couple of weeks.
Right off the bat, it’s a bit grim. We’ve only got one spot to look at – Waimanalo – and honestly, it’s a tough run. There’s no surf worth jumping for any time soon. For the first few days, we’re looking at a messy chop with a 30 km/h onshore wind. The water’s sitting at 81°, which is bang on average for this time of year, nothing weird there.
Sunday the 6th is a write-off. Monday the 7th sees a bit more size, with swell pushing to around 8ft from the ENE, but that’s paired with a 30 km/h cross-onshore and a lumpy texture. That kind of wave energy is strong (1901), but it’s just not surfable in any clean way. Tuesday the 8th edges closer to callable – we get a clean look with a 6ft ENE swell and lighter cross-offshore wind from the south. That’s actually the standout window in this whole period. Combined wave energy is still moderate (885), so there’s some push, but the period is 11 seconds, so it’ll have decent shape and lines. For a beginner-friendly break, that’s about as good as it gets this week.
After Tuesday afternoon, we slide into a long, flat, or poor stretch. From Wednesday the 9th all the way through the 21st, it’s mostly small, weak, or choppy. Swell sizes hover around the 3ft to 5ft range, periods drop below 8 seconds, and the wind is consistently onshore or cross-onshore. A few sessions on the 20th and 21st show a gentle breeze and slight cross-chop, but the energy is weak (below 250). Not exactly setting the world on fire.
If you’re a beginner and you just want to get wet with cleanish lines, Tuesday the 8th is your only real chance. After that, it’s a waiting game. It doesn’t look like it’ll stay poor forever, but it's gonna be a long gap before the next decent session.
- Rusty
Short Range ForecastHeavy rain (total 36mm), heaviest during Sun afternoon. Warm (max 28°C on Tue afternoon, min 24°C on Sun night). Winds decreasing (fresh winds from the SSE on Mon night, light winds from the SSE by Tue night). | Days 4-6 Weather SummarySome drizzle, heaviest during Wed afternoon. Warm (max 27°C on Wed morning, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 12 | E 12 | E 12 | ENE 13 | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | E 13 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 12 | ENE 11 | ENE 10 | ENE 10 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1261 | 1155 | 1312 | 1901 | 694 | 1294 | 885 | 698 | 356 | 177 | 206 | 204 | 286 | 186 | 191 | 204 | 404 | 597 | 377 | 209 | 387 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | cross-on | on | 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 | 3:07PM0.55m | 4:11AM0.55m | |||||||
Low Tide | 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 | 9:09AM0.14m | 9:26PM0.05m | ||||||||
 |  |  |  | | |  |  | | | |  | | |  | | | | | | | |
 | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — |
mm | — | 6 | 13 | 4 | 4 | 6 | 2 | — | 1 | — | 1 | — | — | — | — | — | — | — | 1 | — | — |
Temp °C | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 |
Feels °C | 26 | 26 | 24 | 25 | 27 | 26 | 27 | 29 | 30 | 30 | 29 | 27 | 24 | 24 | 24 | 23 | 24 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | S 12 | SSW 12 | E 12 | SW 11 | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 8 | E 13 | E 13 | E 12 | ENE 7 | E 12 | ENE 12 | NNE 7 | SSW 15 | NE 8 | NNE 8 | SSW 13 |
| kJ | 72 | 85 | 1312 | 63 | 694 | 1294 | 885 | 698 | 356 | 177 | 166 | 158 | 104 | 186 | 98 | 142 | 48 | 22 | 49 | 82 | 17 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | E 16 | SSW 14 | SSW 17 | SSW 11 | SW 14 | SW 10 | E 14 | E 14 | E 13 | NW 10 | NW 10 | NW 9 | E 12 | SSW 16 | SSW 16 | SSW 15 | NW 10 | SSW 16 | SW 16 | SW 16 |
| kJ | 50 | 78 | 134 | 92 | 98 | 304 | 79 | 140 | 134 | 168 | 60 | 33 | 27 | 103 | 26 | 26 | 23 | 4 | 24 | 10 | 10 |
Swell 3 Height (m) Direction Period (s) | N 8 | SSW 19 | SSW 18 | SSE 8 | SSW 17 | S 15 | S 15 | SSW 15 | S 8 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | NW 9 | SSW 12 | S 12 | S 12 | S 12 | NW 9 | SW 13 | NW 15 |
| kJ | 5 | 35 | 65 | 19 | 94 | 116 | 115 | 72 | 28 | 65 | 35 | 34 | 33 | 12 | 14 | 11 | 11 | 3 | 3 | 7 | 8 |
Wind waves Height (m) Direction Period (s) | ENE 12 | E 12 | — | ENE 13 | ENE 7 | S 8 | SSE 7 | S 8 | — | — | ENE 8 | ENE 8 | ENE 7 | — | ENE 7 | ENE 8 | ENE 12 | ENE 11 | ENE 10 | ENE 10 | ENE 9 |
| kJ | 1261 | 1155 | — | 1901 | 327 | 86 | 75 | 112 | — | — | 206 | 204 | 286 | — | 191 | 204 | 404 | 597 | 377 | 209 | 387 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 44 | 9 | 118 | 48 | 66 | 66 | 5 | 0 | 5 | 9 | 15 | 44 | 15 | 17 | 44 | 44 | 17 | 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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