Surf Forecasts:
Kailua Beach surf forecast from 15 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 11PM (local time) - 15ft (4.5m), 10s period, E swell with 4,349 kJ wave energy.
Best Forecast Surf Conditions for Kailua Beach this week:
The most powerful waves expected at Kailua Beach in the next 16 days are 4.5m 10s and forecast to arrive on Saturday (Aug 15) at 11PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 10s period and expected on Sunday (Aug 16) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Sat 15th Aug) | 15ft (4.5m) 10s |
Table - best surf conditions forecast for Kailua Beach over the next 16 days.
The Lowdown
Alright, Rusty here, and I gotta level with you. For Kailua Beach, the next couple of weeks look like a total bust. The water's a nice, normal 81° for this time of year, but that's the only good news. We're staring down a long stretch of poor conditions. The wind is almost always on it or cross-onshore, which just kills any chance of clean waves. The wave energy is all over the place, from a weak little 110 to a massive 2594, but it's all wind-driven junk with short periods, so it's just sloppy.
From Saturday the 15th of August all the way through the end of the month, it's the same sad story. Saturday kicks off with a huge 13-foot east swell, but it's under thunderstorm risks and a near gale-force ENE wind at 31 mph. That's a hard pass. Sunday drops to 10-foot, but the wind is just as bad, shifting onshore and creating a terrible cross-chop. The swell settles down to around 4 feet during the week, but it's still all onshore and short-period, so it's just lumpy, choppy, and frustrating. The wind never lets up, and the energy is too weak to do anything with.
The only flicker of hope, way down the line, is around the 27th of August. Thursday the 27th and Friday the 28th see a huge jump in swell period, hitting 18 seconds and 17 seconds. That's proper, long-period groundswell. The heights are only around 4.6 feet, but the combined energy is strong, about 1368 to 1394. The catch? The wind is still cross-onshore from the east at 15 mph, so it's likely going to be choppy and bumpy. But that's a long-period swell, which is rare here, and it could really set up if the wind ever plays nice. It's a promising but uncertain prospect for the end of the month. Honestly, with the constant onshore wind, the setup at Kailua Beach might be more interesting for kite surfing than paddle surfing during this whole stretch.
So, there's no real standout day. The best I can say is keep an eye on that long-period swell around the 27th, but don't get your hopes up. For now, it's a waiting game.
Short Range ForecastHeavy rain (total 43mm), heaviest during Sun morning. Warm (max 27°C on Sun afternoon, min 24°C on Sat night). Winds decreasing (near gales from the E on Sat night, moderate winds from the ENE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 25°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 9 | E 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 5 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | E 8 | NE 7 | ENE 8 | NE 8 | NE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1811 | 2587 | 3467 | 1380 | 766 | 472 | 327 | 252 | 181 | 139 | 109 | 106 | 144 | 149 | 158 | 143 | 72 | 57 | 109 | 169 | 102 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | on | cross-on | on | on | on | on | cross-on | cross-on |
High Tide | 4:13PM0.75m | 4:57AM0.62m | 4:27PM0.68m | 5:52AM0.61m | 4:33PM0.62m | 7:01AM0.60m | 4:19PM0.57m | 8:55AM0.61m | 11:13AM0.64m | 12:09PM0.69m | |||||||||||
Low Tide | 9:51AM0.24m | 10:47PM0.20m | 10:29AM0.33m | 11:11PM0.19m | 11:08AM0.42m | 11:37PM0.19m | 11:57AM0.50m | 00:07AM0.20m | 00:51AM0.22m | 2:10AM0.23m | 3:54AM0.21m | ||||||||||
 | |  | | | |  | |  | | | |  | | | | |  | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — |
mm | 1 | 2 | 11 | 15 | 8 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 25 | 27 | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 |
Feels °C | 23 | 22 | 21 | 21 | 27 | 26 | 25 | 25 | 25 | 24 | 25 | 24 | 25 | 26 | 26 | 26 | 26 | 26 | 27 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 14 | S 16 | SSE 8 | S 7 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | NNE 7 | S 12 | S 12 | E 8 | E 8 | NE 7 | ENE 8 | NE 8 | NE 7 |
| kJ | 55 | 30 | 62 | 47 | 77 | 35 | 103 | 65 | 55 | 54 | 30 | 29 | 10 | 11 | 11 | 74 | 72 | 57 | 109 | 169 | 102 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | NNW 8 | S 18 | NNW 8 | S 16 | S 13 | SSE 6 | S 6 | E 9 | SW 17 | SW 18 | SW 18 | S 12 | SW 16 | SE 9 | NE 6 | SSW 18 | E 8 | NNE 7 | SSW 16 | E 8 |
| kJ | 7 | 7 | 25 | 6 | 46 | 55 | 12 | 6 | 15 | 11 | 12 | 12 | 11 | 11 | 3 | 40 | 30 | 57 | 59 | 25 | 22 |
Swell 3 Height (m) Direction Period (s) | S 20 | S 16 | SW 16 | W 12 | S 13 | S 16 | N 8 | N 7 | N 7 | N 7 | N 7 | S 8 | SE 9 | SE 9 | SW 16 | SSW 18 | SSE 9 | SSW 17 | SSW 17 | SSE 8 | SSW 16 |
| kJ | 7 | 5 | 10 | 3 | 30 | 45 | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 10 | 31 | 9 | 27 | 29 | 7 | 50 |
Wind waves Height (m) Direction Period (s) | ENE 9 | E 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 5 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | NE 6 | — | — | — | — |
| kJ | 1811 | 2587 | 3467 | 1380 | 766 | 472 | 327 | 252 | 181 | 139 | 109 | 106 | 144 | 149 | 158 | 143 | 40 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 153 | 206 | 215 | 231 | 43 | 17 | 41 | 41 | 17 | 41 | 41 | 41 | 41 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Kailua Beach Surf forecast
The above surf forecast table for Kailua Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kailua Beach can be found by selecting the local surf guide option on the grey menu. Our Kailua Beach 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 (Kailua Beach) 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 Kailua Beach 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.
Kailua Beach is 0 km (0 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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