Surf Forecasts:
Waimanalo surf forecast from 8 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 7ft (2.2m), 12s period, ENE swell with 1,302 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5PM (local time) - 5.5ft (1.7m), 11s 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 5PM. The primary swell is predicted to be 1.7m and 11s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Waimanalo in the next 16 days are 2.2m 12s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 7s period and expected on Tuesday (Sep 08) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Best Surf | 5PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Most Powerful | 2AM (Tue 8th Sep) | 7ft (2.2m) 12s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright gang, Rusty here with the lowdown on Waimanalo for the next 16 days. We’ve got a tiny window of clean surf, then a whole lot of blown-out junk.
The one to circle on the calendar is Tuesday afternoon, September 8th. That’s your best bet. The wind will be offshore from the southwest, light to moderate, making the waves glassy. Expect chest to head-high sets, around 6ft, pushing in from the east-northeast. The swell period is a solid 11 seconds, so there’s real groundswell energy. The combined energy is moderate at 808. This is for the experienced crew – Waimanalo is an exposed break, so with that size, beginners should stay out of the way. The water is 81°, which is about average for this time of year.
Before that, Monday the 7th is a total washout – strong cross-onshore wind, lumpy, and messy. Tuesday morning the 8th is a little better with a cross-offshore wind, but the real glory is that afternoon.
After that Tuesday high, it’s a long, ugly slide. From Wednesday the 9th onward, the wind locks in from the east and east-northeast, blowing cross-on or straight onshore for days. The swell drops from 4ft down to under 3ft, and the period gets short and weak. The combined energy plummets from 489 down to just 84 by the 14th. There’s a solid 10-day stretch from the 9th to the 18th where the surf is just poor – choppy, weak, and blown out. That’s a long gap.
By the end of the second week, around the 20th and 21st, we get a slight shift. The swell direction swings to the north-northwest with a longer period of 12 seconds, and the energy jumps back to around 367-398. But the wind is still hammering onshore from the east-northeast, so it’s a lumpy, messy mess. A long-period groundswell like that needs a point break or reef, not a beach break with onshore chop.
So, bottom line: you’ve got one real window – Tuesday afternoon, September 8th. After that, you’re waiting for a long run of poor conditions. But it’s Waimanalo, and it’s fairly consistent here, so it won’t stay poor forever. Forecasts can change.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Warm (max 28°C on Tue afternoon, min 26°C on Tue night). Winds decreasing (strong winds from the SSE on Mon night, calm by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu afternoon, min 25°C on Thu afternoon). Wind will be generally light. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | E 7 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | NE 8 | NE 8 | NE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 800 | 1302 | 870 | 711 | 378 | 211 | 168 | 269 | 276 | 240 | 162 | 108 | 297 | 250 | 160 | 160 | 141 | 72 | 72 | 74 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | off | cross-off | cross-on | on | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | on | cross-on | on | on | on |
High Tide | 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 | 3:19PM0.50m | 4:57AM0.55m | |||||||
Low Tide | 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 | 9:50AM0.20m | 9:48PM0.03m | |||||||
 |  | |  |  | |  |  | | | | | |  | | | | | | | |
 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — |
mm | 4 | 10 | 1 | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 26 | 24 | 27 | 28 | 30 | 30 | 29 | 30 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 15 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | E 13 | E 12 | E 12 | E 11 | E 11 | NNE 8 | ENE 8 | ENE 10 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 |
| kJ | 171 | 1302 | 870 | 711 | 378 | 211 | 117 | 117 | 104 | 103 | 94 | 88 | 39 | 207 | 160 | 75 | 75 | 72 | 72 | 74 |
Swell 2 Height (m) Direction Period (s) | S 9 | SW 14 | SSW 15 | S 9 | E 14 | E 13 | E 13 | NW 8 | NW 7 | NW 9 | SSW 16 | NNE 8 | SSW 15 | SSW 15 | NE 8 | SW 16 | SSW 13 | ENE 9 | ENE 9 | ENE 8 |
| kJ | 39 | 834 | 75 | 122 | 132 | 168 | 168 | 15 | 14 | 21 | 26 | 26 | 22 | 22 | 70 | 10 | 17 | 46 | 26 | 55 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | NNW 12 | NNW 12 | E 14 | NW 9 | NW 8 | NW 8 | NW 10 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | NW 8 | SSW 12 | SSW 16 | SW 13 | NW 15 | SSW 15 | SW 15 | SSW 14 |
| kJ | 93 | 14 | 14 | 97 | 50 | 33 | 32 | 33 | 33 | 32 | 14 | 26 | 2 | 13 | 24 | 7 | 8 | 21 | 8 | 20 |
Wind waves Height (m) Direction Period (s) | E 7 | SSE 7 | S 10 | — | — | — | ENE 3 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 10 | — | ENE 10 | ENE 9 | E 5 | E 5 | — |
| kJ | 800 | 607 | 408 | — | — | — | 3 | 269 | 276 | 240 | 162 | 108 | 297 | 250 | — | 160 | 141 | 27 | 17 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 113 | 117 | 131 | 0 | 0 | 9 | 14 | 15 | 15 | 15 | 15 | 44 | 15 | 16 | 21 | 15 | 16 | 15 | 15 | 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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