Surf Forecasts:
Waimanalo surf forecast from 2 Sep 2026:
- Most powerful swell: Monday 7 Sep, 5PM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,915 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.4m 13s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 14s period and expected on Tuesday (Sep 08) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Mon 7th Sep) | 8ft (2.4m) 13s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, I’ve got the numbers for you. We’re looking at Waimanalo here, an exposed spot on the east side. Normally this place can pump when a good NE groundswell lines up with clean trades, but the next couple of weeks are looking pretty grim. The water temp is sitting at 81°, which is dead average for this time of year – nothing weird going on there.
Right off the bat, from Wednesday the 2nd all the way through to Monday the 7th, it’s a write-off. The wind is onshore or cross-onshore – ENE at 22 to 25 mph – making everything lumpy and choppy. There’s some size, with swell heights around 7 ft to 8 ft, but it’s coming from ENE, short period around 7-8 seconds, and the wave energy is moderate to strong. But none of that matters with that wind. It’s just messy.
Tuesday the 8th is the only half-decent window in the whole 16 days. We’ve got a brief break in the trade pattern – wind swings SSE at 19 mph in the morning, dropping to 16 mph in the afternoon, and it’s cross-offshore. The swell drops a bit, 7 ft from ENE with an 11-second period in the morning, then 6 ft in the afternoon. Combined energy is still healthy. The guidance says it’s clean. For Waimanalo with those conditions, you might actually find a few workable ones. This is the standout window – but it’s only a day, and it’s marginal. The crowds sometimes turn up, and it’s fairly consistent, so don’t expect to be alone.
After that, from Wednesday the 9th right through to the end of the period on Thursday the 17th, we’re right back into a poor pattern. The trades return, ENE winds 12-19 mph, either onshore or cross-onshore, swell is all ENE and mostly short period (6-9 seconds). The wave energy drops off a cliff – by the 13th it’s weak, and stays low. Surfable? Barely. It’s a long stretch of blank days.
Honestly, for Waimanalo, a run like this is pretty normal when the trades are locked in. It doesn’t stay poor forever – forecasts can change – but right now, there’s nothing to get excited about besides that Tuesday morning. If you’re desperate, paddle out then, but keep your expectations low.
- Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Warm (max 26°C on Wed morning, min 25°C on Wed morning). Mainly strong winds. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Mon morning. Warm (max 26°C on Sat morning, min 25°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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 8 | ENE 8 | E 8 | ENE 7 | ENE 7 | ENE 7 | E 14 | E 14 | E 14 | E 13 | ENE 13 | E 13 | ENE 13 | ENE 12 | ENE 12 | ENE 13 | ENE 13 | ENE 12 | ENE 11 | ENE 10 | E 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 602 | 549 | 484 | 485 | 456 | 443 | 415 | 478 | 538 | 780 | 1654 | 1266 | 1365 | 1261 | 1220 | 1687 | 1915 | 1837 | 1163 | 706 | 235 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-on | on | on | cross-on | on | on | on | on | on | cross-on | cross-on | on | cross | cross-off | cross-off | cross |
High Tide | 3:54PM0.43m | 9:02AM0.54m | 10:54AM0.59m | 11:56AM0.64m | 12:39PM0.68m | 11:21PM0.29m | 1:14PM0.70m | 00:23AM0.35m | 1:44PM0.70m | 1:12AM0.41m | |||||||||||
Low Tide | 12:22PM0.33m | 00:03AM0.02m | 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 | |||||||||||
 |  |  |  | |  | | |  | | | | |  |  |  | | | | | | |
 | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — |
 | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — |
mm | 1 | — | — | — | — | — | — | — | 1 | — | 1 | 2 | — | 2 | 4 | 7 | — | — | — | — | 1 |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 28 | 27 |
Feels °C | 24 | 24 | 22 | 22 | 21 | 21 | 22 | 21 | 21 | 23 | 24 | 24 | 26 | 25 | 26 | 26 | 26 | 28 | 28 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 16 | E 13 | E 13 | SSE 12 | E 14 | E 14 | E 14 | E 14 | E 13 | S 11 | NNE 7 | SSW 11 | SSW 12 | ENE 12 | ENE 13 | ENE 13 | ENE 12 | ENE 11 | ENE 10 | NE 8 |
| kJ | 130 | 79 | 123 | 121 | 117 | 264 | 357 | 478 | 538 | 780 | 123 | 51 | 70 | 77 | 1220 | 1687 | 1915 | 1837 | 1163 | 706 | 100 |
Swell 2 Height (m) Direction Period (s) | E 14 | E 14 | S 15 | SSE 13 | E 12 | SSE 12 | S 12 | S 11 | S 12 | S 12 | NNE 10 | S 12 | N 8 | SSW 19 | SSW 11 | SSW 17 | SSW 17 | SW 15 | SW 15 | SW 13 | SSW 10 |
| kJ | 33 | 66 | 69 | 64 | 107 | 152 | 134 | 119 | 141 | 175 | 19 | 139 | 10 | 35 | 48 | 92 | 95 | 136 | 305 | 168 | 147 |
Swell 3 Height (m) Direction Period (s) | S 10 | S 11 | SSE 15 | S 15 | SSW 14 | NW 9 | N 9 | N 12 | NNE 11 | NNE 10 | SSW 18 | N 9 | SSW 16 | SSE 10 | SSW 18 | SW 11 | SW 14 | S 10 | S 15 | E 14 | E 14 |
| kJ | 8 | 23 | 21 | 67 | 38 | 3 | 2 | 3 | 12 | 20 | 30 | 13 | 25 | 9 | 65 | 33 | 69 | 44 | 227 | 146 | 179 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 13 | E 13 | ENE 13 | ENE 12 | — | — | — | — | — | — | E 9 |
| kJ | 602 | 549 | 484 | 485 | 456 | 443 | 415 | 456 | 358 | 261 | 1654 | 1266 | 1365 | 1261 | — | — | — | — | — | — | 235 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 50 | 50 | 116 | 146 | 116 | 50 | 57 | 146 | 45 | 44 | 50 | 15 | 44 | 15 | 44 | 15 | 15 | 23 | 66 | 113 | 5 |
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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