
Surf Forecasts:
Waimanalo surf forecast from 9 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 7.5ft (2.3m), 11s period, ENE swell with 1,242 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.3m 11s and forecast to arrive on Sunday (Aug 16) 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 0.7m 16s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 16th Aug) | 7.5ft (2.3m) 11s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming up for Waimanalo over the next couple of weeks.
Straight up, the next week is looking pretty grim for a paddle. We’ve got a solid E/NE tradewind blowing at 15-22 mph that’s just going to wreck the surface. The swell is on the small side, mostly 4 to 6 ft, a short period windswell of 6-8 seconds, and the wave energy is moderate, in the 100s to 300s range. Conditions are tagged as poor across the board, so honestly, you’re not missing much.
The real story starts to shift around the 16th of August, a Sunday. We see the swell pick up to 7 ft from the ENE with a longer 11-second period. The wave energy jumps to a strong 1542. On the 16th afternoon, the swell bumps to 8 ft from the ENE with a 13-second period, and wave energy is very strong at 2039. The wind swings around from the NW at 9 mph, going cross-shore. This is the standout window for experienced surfers – that size is going to be powerful and beyond what beginners should be on. The 17th of August has slightly smaller swell, 7 ft morning and 6 ft afternoon, with the wind going cross-offshore from the south at 9 mph and the conditions turning clean. Wave energy is still strong at 1070 and 646. This looks like a great paddle, with better shaped waves.
After that, it fades fast. From the 18th, we’re back into small, weak swell and poor tradewind conditions, so the trail goes cold for the rest of the window.
There won’t be any surf recommendations for the first week. The only real standouts to pencil in are that Sunday afternoon the 16th and Monday the 17th. The 16th is for experts only with that 8 ft swell, while the 17th should offer cleaner, more manageable waves for stronger intermediate surfers. The water temperature anomaly is listed as "-", so it's about average for this time of year.
Rusty, signing off.
Short Range ForecastSome drizzle, heaviest during Sun morning. Warm (max 26°C on Mon morning, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | E 7 | E 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
Wave Graph | |||||||||||||||||||
232 | 278 | 300 | 310 | 266 | 266 | 245 | 238 | 208 | 139 | 143 | 170 | 182 | 177 | 233 | 293 | 349 | 388 | 511 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | on | on | on | on | on |
High Tide | 1:40PM0.72m | 11:41PM0.30m | 2:17PM0.74m | 00:48AM0.34m | 2:50PM0.74m | 1:43AM0.37m | 3:21PM0.72m | 2:36AM0.40m | 3:49PM0.69m | 3:28AM0.42m | 4:12PM0.63m | 4:22AM0.43m | |||||||
Low Tide | 5:29AM-0.07m | 8:45PM0.24m | 6:24AM-0.09m | 8:55PM0.22m | 7:12AM-0.10m | 9:16PM0.20m | 7:57AM-0.08m | 9:41PM0.17m | 8:39AM-0.03m | 10:07PM0.14m | 9:20AM0.03m | 10:33PM0.12m | |||||||
— | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
7:05 | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 25 | 26 |
Feels °C | 23 | 24 | 23 | 25 | 26 | 25 | 26 | 25 | 25 | 23 | 23 | 23 | 23 | 24 | 23 | 24 | 23 | 22 | 24 |
Swell 1 Height (m) Direction Period (s) | NE 9 | SSW 13 | NNW 11 | NNW 10 | NNW 9 | NNW 8 | NNW 8 | SSW 15 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 |
14 | 17 | 23 | 33 | 27 | 24 | 13 | 42 | 40 | 62 | 155 | 152 | 257 | 183 | 161 | 159 | 106 | 106 | 96 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | N 12 | S 18 | S 16 | SSW 16 | SSW 15 | SSW 15 | NNW 8 | NNW 7 | S 20 | SSW 13 | SSW 13 | NNW 7 | NNW 9 | NNW 8 | NNW 7 | NW 7 | NW 7 | NNW 9 |
17 | 11 | 24 | 20 | 49 | 45 | 44 | 11 | 5 | 119 | 55 | 55 | 5 | 7 | 6 | 5 | 2 | 2 | 8 | |
Swell 3 Height (m) Direction Period (s) | SSW 18 | SSE 10 | SSW 12 | SSE 10 | NE 8 | SSW 12 | SSE 9 | S 11 | SSE 9 | ESE 9 | NNW 7 | NNW 7 | SE 9 | S 9 | S 9 | — | S 11 | N 10 | E 13 |
30 | 9 | 15 | 9 | 11 | 14 | 8 | 10 | 8 | 16 | 5 | 5 | 3 | 2 | 2 | — | 2 | 2 | 14 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | E 7 | E 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
232 | 278 | 300 | 310 | 266 | 266 | 245 | 238 | 208 | 139 | 143 | 170 | 182 | 177 | 233 | 293 | 349 | 388 | 511 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 44 | 44 | 44 | 44 | 44 | 44 | 18 | 44 | 44 | 18 | 45 | 50 | 44 | 55 | 56 | 44 | 55 | 116 | 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.











