Surf Forecasts:
Waimanalo surf forecast from 16 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 2AM (local time) - 6ft (1.8m), 8s period, ENE swell with 365 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 1.8m 8s and forecast to arrive on Sunday (Jul 19) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 15s period and expected on Tuesday (Jul 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 19th Jul) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let me break down what we’ve got for the next couple of weeks at Waimanalo.
Honestly, the outlook is a tough one. For the first 13 days, the conditions are just plain poor. The wind is relentless, blowing from the ENE or NE at 16 to 19 mph or more, which is either cross-on or onshore. Even when the swell tries to push a bit, it’s all chopped up or lumpy. The swell energy is mostly moderate (125 to 471), but the quality is zero. There’s a gap of no real surf on offer from the 16th of July right through the 28th, with only a brief flicker of marginal conditions on the 29th of July.
Then, the final few days show a shift. The 29th of July morning is the only time that gets a score of 1 out of 10, which is “marginal”. The swell jumps to 6 ft from the ENE, with a period of 11 seconds, and the wind drops to a gentle 9 mph. That’s a big improvement, but it’s still cross-onshore, so it’s going to be a bit choppy and messy. The combined energy is strong (860), so there’s power in the water, but it’s not clean. The water temperature is average for the time of year, nothing unusual.
The 30th and 31st see the swell drop back down to 4 ft and the period shortening to 6 or 9 seconds, with stronger onshore winds again. It’s a return to the poor stuff.
If you’re an expert and you’re desperate, the 29th of July morning might be your only look. That 6 ft ENE swell with a moderate period will have some grunt, but the wind and chop will make it a battle. For anyone else, it’s a stay-on-the-beach kind of run. This pattern is fairly normal for the area, so a blank run like this doesn’t come as a shock.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed night. Warm (max 25°C on Wed night, min 24°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sun night. Warm (max 25°C on Sat night, min 24°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | ||||||||||||||
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) | NE 7 | ENE 7 | E 6 | ENE 6 | ENE 7 | NE 7 | ENE 6 | E 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 7 | E 16 | E 15 | E 14 | E 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 156 | 134 | 85 | 165 | 158 | 131 | 122 | 135 | 175 | 365 | 273 | 250 | 181 | 114 | 146 | 176 | 267 | 253 | 239 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | on | on | cross-on | on | cross-on | on | on | on | on | on | on | on | on | cross-on |
High Tide | 3:19AM0.32m | 5:06PM0.69m | 4:23AM0.32m | 5:34PM0.63m | 5:36AM0.33m | 5:55PM0.57m | 7:07AM0.34m | 6:08PM0.51m | 9:13AM0.37m | 6:04PM0.45m | 11:19AM0.44m | 4:59PM0.41m | |||||||
Low Tide | 11:10PM0.19m | 9:34AM-0.06m | 11:44PM0.16m | 10:16AM0.02m | 00:18AM0.13m | 10:57AM0.11m | 00:51AM0.11m | 11:40AM0.20m | 1:25AM0.09m | 12:37PM0.29m | 2:03AM0.07m | 3:19PM0.35m | 2:49AM0.05m | ||||||
 |  | | |  | |  | | | | | | | | | |  | | | |
 | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | 7:15 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — |
mm | 2 | — | — | 1 | — | — | — | — | — | — | — | — | 1 | — | — | 2 | 1 | 1 | 3 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 24 | 25 | 25 | 25 | 25 | 25 | 24 |
Feels °C | 25 | 25 | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 22 | 23 | 22 | 24 | 23 | 24 | 25 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | NNE 7 | SSW 14 | SSW 16 | SSW 16 | NNE 7 | NNE 7 | NNE 8 | SSW 12 | SSW 12 | S 19 | NNE 8 | NNE 8 | S 16 | E 16 | E 15 | E 14 | E 14 |
| kJ | 48 | 25 | 40 | 18 | 48 | 49 | 28 | 27 | 22 | 30 | 15 | 27 | 36 | 64 | 81 | 176 | 267 | 253 | 239 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | SSW 13 | SSW 17 | SSW 17 | SW 16 | ESE 8 | SSW 14 | SSW 14 | SSW 14 | SE 9 | S 19 | SSW 12 | S 18 | S 16 | E 17 | S 15 | S 14 | S 14 | S 14 |
| kJ | 7 | 17 | 29 | 30 | 10 | 6 | 41 | 36 | 39 | 3 | 29 | 15 | 55 | 47 | 95 | 107 | 103 | 99 | 89 |
Swell 3 Height (m) Direction Period (s) | W 16 | W 15 | SSW 13 | SSE 10 | S 7 | S 7 | SW 10 | SE 9 | NNE 6 | S 21 | SE 9 | S 6 | S 11 | S 13 | SW 18 | E 8 | SW 17 | SW 16 | S 26 |
| kJ | 19 | 17 | 16 | 10 | 1 | 1 | 4 | 3 | 4 | 8 | 3 | 1 | 10 | 31 | 13 | 18 | 11 | 11 | 53 |
Wind waves Height (m) Direction Period (s) | NE 7 | ENE 7 | E 6 | ENE 6 | ENE 7 | NE 7 | ENE 6 | E 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 156 | 134 | 85 | 165 | 158 | 131 | 122 | 135 | 175 | 365 | 273 | 250 | 181 | 114 | 146 | 134 | 204 | 168 | 175 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 15 | 44 | 50 | 17 | 44 | 44 | 17 | 44 | 50 | 44 | 17 | 44 | 15 | 17 | 44 | 15 | 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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