Surf Forecasts:
Waimanalo surf forecast from 4 Aug 2026:
- Most powerful swell: Tuesday 4 Aug, 2AM (local time) - 5ft (1.6m), 12s period, ENE swell with 689 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 1.6m 12s and forecast to arrive on Tuesday (Aug 04) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 06) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Tue 4th Aug) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you — this is a rough one. We’re looking at a solid 16-day window for Waimanalo, and honestly, there’s not a single moment worth paddling out for. The whole stretch is a write-off.
Right from the start, Monday the 3rd of August, we’ve got some swell coming in at 5 ft from the ENE, but the wind is blowing straight onshore at 15 mph, and the wave energy is only moderate (374). The water’s sitting at 80°, about average for this time of year, but that doesn’t help when the surface is garbage. The conditions are just poor, and that’s the story for the whole run.
The swell sticks around from 4 ft to 6 ft through the first week, but the wind never lets up — it’s onshore or cross-onshore, often a fresh breeze of 15 to 22 mph. The period is short, mostly 7 to 8 seconds, so there’s no power or shape to speak of. By Friday the 7th, the swell drops to under 3 ft and the period plummets to 5 seconds — that’s pure wind slop, with energy down to just 88 (weak).
We get a bit of a bump in size from the 8th to the 10th, with waves around 5 ft to 6 ft, but the wind is cranking onshore at 22 mph, making it lumpy and messy. Not a single clean window. The second week doesn’t get any better — from the 13th onward, the swell builds to 7 ft to 8 ft, which is getting into expert territory, but with the wind howling onshore at 22 to 25 mph, it’s just a blown-out, churning mess. Wave energy climbs into the strong range (up to 675 by the 14th), but with that onshore wind, it’s more of a kite-surfing setup than anything for a paddle surfer.
There’s a slight easing in the wind around the 18th, with a gentler 9 mph cross-onshore, but the swell is still 5 ft with a short period of 7 seconds, and the conditions are still described as poor. It’s just not happening.
Look, Waimanalo is an exposed beach break that needs the right wind, and we’re not getting it. When the swell is decent, the wind ruins it. When the wind is a little lighter, the swell is weak. There’s a gap of about 16 days here with no real surf on offer. That’s a long blank run. It’s a bummer, but it happens. The forecasts can change, but right now, leave the board at home.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 25°C on Mon afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 25°C on Thu afternoon, min 25°C on Thu afternoon). Mainly fresh winds. | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 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 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 5 | ENE 5 | ENE 5 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 294 | 689 | 452 | 436 | 492 | 312 | 237 | 88 | 181 | 56 | 32 | 43 | 64 | 237 | 233 | 219 | 346 | 340 | 397 | 337 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | cross-on | on | on | on | cross-on | on | cross-on | cross-on | on | on | cross-on | on | on |
High Tide | 5:09PM0.52m | 7:16AM0.41m | 5:14PM0.48m | 9:27AM0.45m | 4:57PM0.44m | 11:19AM0.53m | 12:18PM0.61m | 1:01PM0.68m | 1:40PM0.72m | 11:41PM0.30m | ||||||||||
Low Tide | 00:22AM0.07m | 11:44AM0.27m | 1:03AM0.04m | 1:35PM0.35m | 1:59AM0.02m | 3:11AM-0.00m | 4:25AM-0.03m | 5:29AM-0.07m | 8:45PM0.24m | |||||||||||
 |  |  | | | | | |  |  | | | | | | |  | | | | |
 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — |
 | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:05 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 26 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 26 | 25 | 28 | 27 | 27 | 25 | 25 | 25 | 25 | 24 | 25 | 24 | 24 | 25 | 23 | 23 | 23 | 23 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | E 12 | ENE 9 | ENE 11 | ENE 11 | S 13 | NNE 9 | NNE 8 | ENE 9 | NNW 8 | ENE 8 | ENE 8 | ENE 7 | NE 9 | N 7 | NE 10 | NE 10 | SSW 13 | SSW 13 | S 18 | S 16 |
| kJ | 76 | 297 | 452 | 436 | 14 | 8 | 7 | 88 | 13 | 56 | 32 | 21 | 19 | 4 | 27 | 17 | 17 | 17 | 24 | 20 |
Swell 2 Height (m) Direction Period (s) | N 7 | E 12 | SSW 12 | SSW 12 | NNE 9 | S 13 | S 12 | S 12 | S 12 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | SW 14 | N 6 | N 6 | SSW 18 | S 17 | SSW 12 | SSE 10 |
| kJ | 4 | 101 | 14 | 13 | 8 | 13 | 12 | 11 | 11 | 12 | 11 | 10 | 9 | 8 | 3 | 3 | 30 | 24 | 15 | 9 |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSE 12 | SSE 13 | SSW 11 | SSW 11 | SSW 11 | NNE 8 | N 8 | S 11 | S 11 | NE 10 | NE 12 | SW 19 | SSW 14 | SSW 14 | S 10 | SSE 10 | SSE 10 | SSW 12 |
| kJ | 15 | 14 | 15 | 16 | 12 | 11 | 11 | 6 | 5 | 10 | 9 | 14 | 23 | 15 | 20 | 19 | 8 | 9 | 9 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 12 | — | — | ENE 10 | ENE 10 | ENE 9 | ENE 5 | ENE 8 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 |
| kJ | 294 | 689 | — | — | 492 | 312 | 237 | 44 | 181 | 33 | 31 | 43 | 64 | 237 | 233 | 219 | 346 | 340 | 397 | 337 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 50 | 15 | 9 | 9 | 15 | 15 | 15 | 15 | 15 | 44 | 15 | 15 | 44 | 44 | 50 | 50 | 44 | 44 | 50 | 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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