Surf Forecasts:
Kailua Beach surf forecast from 17 Aug 2026:
- Best quality surf: Friday 21 Aug, 2AM (local time) - 2.5ft (0.8m), 7s period, NE swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 5PM (local time) - 8ft (2.5m), 9s period, E swell with 1,080 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (local time) - 2.5ft (0.8m), 7s period with NE swell.
Best Forecast Surf Conditions for Kailua Beach this week:
The surf forecast for Kailua Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 2AM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.5m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kailua Beach in the next 16 days are 2.5m 9s and forecast to arrive on Sunday (Aug 16) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 2AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Most Powerful | 5PM (Sun 16th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Kailua Beach over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m calling it like I see it for Kailua Beach. This forecast is a real heartbreaker for anyone looking to paddle out. That exposed east side and those trade winds have the place locked up. There is no standout session here.
Overall Picture: We’re stuck in a long stretch of poor surf and nasty quality. The combined energy is moderate to strong at times, but it’s always fighting the wind. Water temp is a pleasant 81°, right about normal for this time of year.
Let’s Walk Through It: Right now, Sunday the 16th, we’ve got a thunderstorm risk and a 25 mph ESE cross-onshore wind, blowing a 13ft east swell to bits. The combined energy is 2418 (very strong). Complete mess. That afternoon drops to 8ft, but still cross-shore and choppy. Monday the 17th and Tuesday the 18th are the same sad tune: chest-high waves, moderate onshore winds. Don’t bother.
From Wednesday the 19th through the next week, the swell falls off a cliff. We’re down to 2ft to 4ft with light to gentle breezes – but still onshore or cross-onshore. The waves have no push, and there’s no shape. It’s a flat spell for practical purposes.
The Dead Zone: Honestly, there is nothing worth surfing from now until about Thursday, August 27th. That’s a solid 10-day gap with no recommendations at all.
The Only Blip of Size: On Thursday, August 27th, we see a 10ft east-northeast swell with a 10-second period (better energy) and a combined energy of 1672. Strong. But the trade wind is screaming at 18 mph, onshore. That’s big enough for experts only (over 8ft), but it’s going to be a bumpy, onshore mess. The point break might handle it a little, but not with that wind. Friday the 28th is even worse: an 12ft east swell with a combined energy of 2199, and 18 mph cross-onshore wind. That’s a kite-surfing playground, not a surf spot. The rest of the month is more of the same: fresh breeze and lumpy conditions.
Bottom line: There are no good surf options in this entire 16-day span. The water is warm, and the swell tries to show up, but the trade wind ruins everything. It’s a bummer, but a blank run like this is normal for Kailua when these winds lock in. Forecasts can turn, but for now? I’d find something else to do.
Rusty.
Short Range ForecastHeavy rain (total 44mm), heaviest during Sun morning. Warm (max 27°C on Sun afternoon, min 24°C on Mon night). Winds decreasing (near gales from the ESE on Sun morning, moderate winds from the ENE by Tue morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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) | E 9 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 8 | E 8 | ENE 8 | E 8 | E 8 | NE 7 | NE 7 | NE 7 | NNE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2411 | 1080 | 484 | 310 | 261 | 195 | 152 | 161 | 186 | 109 | 84 | 168 | 57 | 54 | 69 | 75 | 59 | 31 | 111 | 141 | 175 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | on | on | on | on | glassy | cross-on | cross-on | on | cross-on | on | cross-on |
High Tide | 4:27PM0.68m | 5:52AM0.61m | 4:33PM0.62m | 7:01AM0.60m | 4:19PM0.57m | 8:55AM0.61m | 11:13AM0.64m | 12:09PM0.69m | 12:42PM0.74m | 9:57PM0.37m | |||||||||||
Low Tide | 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 | 9:32PM0.37m | |||||||||||
 | |  |  | |  | | | | | | | |  |  | | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | 31 | 8 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 26 | 27 | 27 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 23 | 27 | 27 | 25 | 25 | 25 | 25 | 25 | 24 | 26 | 26 | 26 | 27 | 26 | 28 | 28 | 28 | 29 | 29 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | SSE 8 | ENE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | NE 7 | NE 7 | NNE 7 | ESE 9 | E 9 | E 8 |
| kJ | 416 | 119 | 484 | 103 | 65 | 55 | 30 | 30 | 29 | 109 | 84 | 82 | 57 | 54 | 69 | 75 | 59 | 31 | 26 | 38 | 49 |
Swell 2 Height (m) Direction Period (s) | S 16 | S 16 | SSE 7 | SSE 6 | S 6 | E 9 | SW 17 | SSE 8 | NNE 7 | NE 6 | S 12 | NE 6 | NE 6 | NE 6 | E 8 | E 8 | E 8 | ENE 7 | SSE 15 | SSE 12 | S 12 |
| kJ | 48 | 46 | 38 | 12 | 6 | 6 | 11 | 6 | 5 | 42 | 11 | 46 | 42 | 42 | 29 | 21 | 13 | 30 | 42 | 30 | 12 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | S 13 | S 13 | N 8 | N 7 | N 7 | N 7 | SW 18 | SW 18 | S 12 | SSE 9 | S 12 | SSW 18 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 |
| kJ | 7 | 30 | 56 | 1 | 1 | 1 | 1 | 12 | 12 | 11 | 8 | 11 | 31 | 30 | 27 | 29 | 25 | 50 | 26 | 25 | 21 |
Wind waves Height (m) Direction Period (s) | E 9 | E 9 | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | — | NE 6 | ENE 8 | — | — | — | — | ENE 3 | E 4 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 2411 | 1080 | — | 310 | 261 | 195 | 152 | 161 | 186 | — | 39 | 168 | — | — | — | — | 3 | 12 | 111 | 141 | 175 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 231 | 44 | 16 | 41 | 41 | 18 | 41 | 18 | 18 | 17 | 17 | 17 | 17 | 16 | 0 | 11 | 11 | 2 | 16 | 17 | 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.
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