Surf Forecasts:
Waimanalo surf forecast from 12 Aug 2026:
- Best quality surf: Sunday 16 Aug, 8PM (local time) - 10ft (3.0m), 9s period, E swell with cross-shore winds.
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 16ft (5.0m), 10s period, E swell with 5,550 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8PM (local time) - 10ft (3.0m), 9s 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 Sunday (Aug 16) at 8PM. The primary swell is predicted to be 3.0m and 9s 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 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 8AM. 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+) | 8PM (Sun 16th Aug) | 10ft (3.0m) 9s |
| Best Surf | 8PM (Sun 16th Aug) | 10ft (3.0m) 9s |
| Most Powerful | 8AM (Sun 16th Aug) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here for the Waimanalo report.
To be blunt, it’s a total bust. The full 16 days are a dead zone, with no surf worth chasing. Every single entry shows poor surf conditions. The wave energy is weak to moderate, with numbers like 175 (weak) up to 3066 (strong) on August 16th, but that’s all ruined by the wind. The wind is always onshore or cross-onshore from the ENE or E, blowing anywhere from 12 mph to a vicious 34 mph on the 16th, which is a near gale with thunderstorms. Not a chance for clean waves.
The water temperature on the 12th is 81°F, which is about average for the season—just a small anomaly of +0.7°F. The swell is short period, mostly 6 to 7 seconds, and coming from the ENE or E, not the ideal NE direction for this place.
There’s a spike in swell size on the 15th and 16th, with the 16th morning hitting 13 ft and 3066 total energy, but the wind is a near gale cross-onshore, completely blown out. That’s a kite-surfing setup, not a surf one. For beginners, anything over 5 ft is already too much, and by the 15th it’s 10 ft to 13 ft—only for experts, but the wind makes it impossible anyway.
The rest of the days are just as bad. Swell drops to 5 ft or so, but the wind stays onshore or cross-onshore, and the period stays short. No relief at all. This kind of blank run happens, but it’s a tough one to swallow.
Leave the board at home. Nothing to see here.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri night. Warm (max 26°C on Wed night, min 25°C on Wed morning). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 35mm), heaviest during Sun morning. Warm (max 27°C on Sun afternoon, min 25°C on Sat morning). Winds decreasing (gales from the ENE on Sun morning, light winds from the ESE by Sun night). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 11 | E 11 | ENE 9 | E 10 | E 9 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 170 | 158 | 188 | 170 | 226 | 371 | 366 | 463 | 620 | 1969 | 2238 | 2317 | 3060 | 1507 | 903 | 472 | 346 | 245 | 187 | 187 | 207 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 3:21PM0.72m | 2:36AM0.40m | 3:49PM0.69m | 3:28AM0.42m | 4:12PM0.63m | 4:22AM0.43m | 4:30PM0.58m | 5:20AM0.44m | 4:40PM0.52m | 6:27AM0.44m | 4:40PM0.47m | 8:02AM0.45m | 4:17PM0.43m | ||||||||
Low Tide | 9:41PM0.17m | 8:39AM-0.03m | 10:07PM0.14m | 9:20AM0.03m | 10:33PM0.12m | 10:00AM0.11m | 10:59PM0.09m | 10:41AM0.19m | 11:25PM0.08m | 11:25AM0.27m | 11:52PM0.07m | 12:27PM0.33m | 00:26AM0.08m | ||||||||
 | |  | | | | | |  | | | |  | |  | | |  |  | | | |
 | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | 6 | 11 | 4 | 8 | 3 | 3 | — | — | — | — |
Temp °C | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 22 | 24 | 24 | 24 | 24 | 23 | 23 | 22 | 23 | 23 | 23 | 21 | 24 | 27 | 27 | 27 | 24 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 14 | S 16 | S 13 | S 13 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 |
| kJ | 155 | 152 | 257 | 183 | 161 | 159 | 106 | 106 | 62 | 55 | 54 | 62 | 84 | 53 | 56 | 103 | 65 | 55 | 30 | 30 | 13 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | NNW 7 | NNW 8 | NNW 8 | NNW 7 | ESE 10 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | NNW 8 | S 16 | S 16 | SSE 6 | SSE 6 | S 6 | SSE 9 | SSE 9 | SSE 9 |
| kJ | 55 | 55 | 5 | 7 | 6 | 5 | 33 | 6 | 6 | 6 | 6 | 7 | 6 | 46 | 45 | 7 | 6 | 2 | 8 | 8 | 8 |
Swell 3 Height (m) Direction Period (s) | NNW 7 | NNW 7 | SE 9 | S 9 | S 9 | S 18 | NNW 8 | S 17 | S 17 | N 9 | S 16 | S 18 | W 19 | NNW 8 | N 8 | N 8 | N 8 | N 7 | SW 17 | SW 18 | SW 18 |
| kJ | 5 | 5 | 3 | 2 | 2 | 6 | 6 | 6 | 6 | 2 | 20 | 25 | 7 | 7 | 5 | 1 | 1 | 1 | 11 | 12 | 12 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 11 | E 11 | ENE 9 | E 10 | E 9 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 |
| kJ | 170 | 158 | 188 | 170 | 226 | 371 | 366 | 463 | 620 | 1969 | 2238 | 2317 | 3060 | 1507 | 903 | 472 | 346 | 245 | 187 | 187 | 207 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 116 | 18 | 55 | 55 | 45 | 55 | 120 | 50 | 211 | 212 | 212 | 211 | 116 | 48 | 48 | 17 | 44 | 44 | 44 | 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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