Surf Forecasts:
Waimanalo surf forecast from 4 Sep 2026:
- Best quality surf: Monday 7 Sep, 5PM (local time) - 10ft (3.0m), 12s period, E swell with cross-shore winds.
- Most powerful swell: Monday 7 Sep, 5PM (local time) - 10ft (3.0m), 12s period, E swell with 2,300 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 5PM (local time) - 10ft (3.0m), 12s period with E 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 Monday (Sep 07) at 5PM. The primary swell is predicted to be 3.0m and 12s period. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Waimanalo in the next 16 days are 3.0m 12s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 7s period and expected on Monday (Sep 07) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 7th Sep) | 10ft (3.0m) 12s |
| Best Surf | 5PM (Mon 7th Sep) | 10ft (3.0m) 12s |
| Most Powerful | 5PM (Mon 7th Sep) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, let’s get into it. The surf forecast for the next 16 days is a tough one. You’re looking at a long stretch of onshore winds and messy conditions, especially at Waimanalo on Oahu’s east side. The wind is going to be the main problem for most of the month, with a persistent ENE breeze that just won’t let up.
The first few days are practically unsurfable. The water temp is sitting at 80°, which is pretty much average for this time of year. A good solid ENE swell is pushing in, but it’s blown out with strong cross-onshore winds over 18 mph. That’s not your friend.
We do get a bit of a window around September 8th. Tuesday morning sees the wind swing around to a cross-offshore from the S, with a cleaner look. The swell drops to about 6 ft from the ENE, period of 11 seconds – moderate energy at (793). It’s not huge, but that offshore flow will make for some clean, workable lines. The afternoon even better: lighter winds, 5 ft from the same direction, and the energy settles to a mild (533). This is your best bet in the entire window. Crowds are a possibility here, but with the quality on offer, it might be worth it.
After that, the wind cranks back onshore and we’re back into poor conditions. From the 9th onward, it’s a grind: lumpy, cross-onshore chop, and not much to get excited about. The second week shows a little pulse of ENE energy around the 15th and 16th, with swell heights hitting 7 ft to 7 ft and moderate energy pushing up to (1033), but the wind stays nasty – strong breezes and messy surf. Not worth paddling out.
All in all, the 8th is your day. Nothing else in the 16-day window is giving you clean surf. For a spot like Waimanalo, this is a pretty normal blank run when the trade winds are up. It just takes one good southerly or lighter day to turn it around. Keep your eye on the charts.
- Rusty
Short Range ForecastSome drizzle, heaviest during Sun morning. Warm (max 26°C on Thu night, min 25°C on Thu afternoon). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 33mm), heaviest during Sun night. Warm (max 28°C on Tue afternoon, min 23°C on Sun night). Winds decreasing (strong winds from the SSE on Mon night, light winds from the SSE by Tue night). | |||||||||||||||||||
Thu 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 7 | ENE 7 | E 14 | E 14 | ENE 14 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | E 12 | E 12 | ENE 12 | ENE 11 | ENE 10 | E 14 | ENE 8 | ENE 8 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 456 | 403 | 392 | 577 | 1868 | 1519 | 1496 | 1630 | 1382 | 1622 | 1754 | 1960 | 2300 | 1001 | 649 | 349 | 200 | 196 | 176 | 193 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | on | on | cross-on | cross-on | on | cross-on | cross | cross-off | cross-off | cross-off | cross-on | on | on | on |
High Tide | 10:54AM0.59m | 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 | ||||||||||
Low Tide | 1:10AM0.03m | 2:48AM0.04m | 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 | ||||||||||
 |  |  | | | | |  |  |  |  | | |  | | | | | | | |
 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — |
 | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — |
mm | — | — | — | — | — | — | — | — | 1 | 8 | 16 | — | 1 | 5 | 2 | — | 1 | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 28 | 27 | 26 | 26 | 25 |
Feels °C | 22 | 22 | 20 | 21 | 22 | 24 | 24 | 24 | 25 | 26 | 25 | 27 | 27 | 25 | 27 | 30 | 31 | 27 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | E 12 | E 14 | E 14 | E 14 | S 12 | S 12 | S 12 | SSW 12 | SSW 12 | SSW 12 | SSW 14 | SW 15 | SW 15 | ENE 12 | ENE 11 | ENE 10 | ENE 8 | E 13 | E 13 | E 13 |
| kJ | 107 | 264 | 357 | 577 | 136 | 178 | 180 | 152 | 155 | 133 | 233 | 318 | 704 | 1001 | 649 | 349 | 188 | 176 | 176 | 171 |
Swell 2 Height (m) Direction Period (s) | SSE 12 | S 12 | S 12 | S 12 | NNE 11 | NNE 10 | NNE 10 | SSE 9 | NNE 8 | SSE 10 | SSW 18 | S 9 | S 17 | E 15 | E 14 | E 14 | E 14 | SSW 14 | SSW 14 | NW 10 |
| kJ | 85 | 104 | 199 | 193 | 24 | 20 | 19 | 9 | 12 | 10 | 64 | 40 | 142 | 104 | 144 | 184 | 200 | 66 | 36 | 45 |
Swell 3 Height (m) Direction Period (s) | S 14 | NW 9 | N 9 | N 12 | S 19 | SSW 17 | SSW 18 | N 11 | SSE 10 | N 10 | NW 16 | SSW 17 | NNW 13 | SSW 15 | SSW 15 | S 8 | NW 9 | NW 8 | NW 10 | SSW 13 |
| kJ | 64 | 3 | 1 | 3 | 7 | 30 | 30 | 10 | 10 | 8 | 10 | 99 | 17 | 74 | 76 | 68 | 47 | 15 | 26 | 34 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | E 12 | E 12 | S 11 | S 9 | — | — | ENE 8 | ENE 8 | ENE 7 |
| kJ | 456 | 403 | 392 | 369 | 1868 | 1519 | 1496 | 1630 | 1382 | 1622 | 1754 | 1960 | 2300 | 804 | 123 | — | — | 196 | 176 | 193 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 55 | 50 | 55 | 116 | 44 | 44 | 50 | 44 | 44 | 15 | 16 | 48 | 113 | 131 | 5 | 0 | 9 | 18 | 44 | 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.
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