Surf Forecasts:
Kailua Beach surf forecast from 19 Aug 2026:
- Best quality surf: Friday 21 Aug, 2AM (local time) - 3.5ft (1.1m), 7s period, NE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 2PM (local time) - 10ft (3.0m), 8s period, E swell with 1,121 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (local time) - 3.5ft (1.1m), 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 1.1m and 7s period. 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 3.0m 8s and forecast to arrive on Monday (Aug 24) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 11s period and expected on Sunday (Aug 23) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 3.5ft (1.1m) 7s |
| Best Surf | 2AM (Fri 21st Aug) | 3.5ft (1.1m) 7s |
| Most Powerful | 2PM (Mon 24th Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Kailua Beach over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s be straight with you about the next couple of weeks. Right now, the ocean’s just not playing ball for us at Kailua Beach. We've got a stretch of poor surf conditions stretching through the entire first week, and honestly, it’s a bit of a bummer. The winds are mostly onshore or cross-onshore, chopping everything up, and the swell is weak and short-period. It’s going to be a fight, not a glide.
The first real chance of something decent doesn't arrive until the first of September. Before that, it's a long grind of onshore winds. We're looking at a solid gap of about a week with zero surf on offer. Kailua Beach is usually more consistent than this, so a blank run like this stands out.
Now, for that one bright spot. On Tuesday, the 1st of September, things start to change in a big way. The swell builds through the day, and the energy in the water jumps dramatically, from moderate readings of around 257 to a strong 1391 by morning. That’s a massive difference. It’s a long-period swell too, with the period stretching to 11-13 seconds.
This is where Kailua Beach (Big Island) shines. This spot is a point break, and a long-period groundswell is exactly what it wants. It loves the direction from the E, which is also the optimum direction for it. However, the wind is a real letdown. It's still howling onshore or cross-onshore at 15-22 mph, which will keep things messy.
This promising pulse grows even stronger on the 2nd of September, with that combined energy hitting a huge 2489. The swell is going to push up to 8ft. That size is getting big, and with the onshore wind, it'll be a heavy, lumpy mess. We're in the realm where it's for experts only. For the rest of us, it might be more interesting to watch than to paddle out. The period is also over 15 seconds at times, which, while powerful, can make a point break like this a bit too straight. It might not be the perfect glassy day we all dream of, but it's the only real pulse in the window.
The energy is promised, but the conditions will likely keep it from being pristine. We’ll have to take what we can get. Don't expect perfection, but keep an eye on that first week of September. It's a long way out and forecasts change, but at least there's something to hope for.
Stay stoked,
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 36mm), heaviest during Mon night. Warm (max 26°C on Sat morning, min 24°C on Mon afternoon). Winds increasing (moderate winds from the E on Sat morning, strong winds from the NE by Sun night). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 8 | ENE 8 | E 8 | E 8 | E 8 | NE 7 | NE 7 | ENE 7 | ENE 7 | ENE 6 | E 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 89 | 176 | 80 | 57 | 54 | 119 | 112 | 117 | 141 | 123 | 200 | 317 | 231 | 422 | 500 | 970 | 1046 | 720 | 476 | 341 | 303 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | glassy | cross-on | on | cross-on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 8:55AM0.61m | 11:13AM0.64m | 12:09PM0.69m | 12:42PM0.74m | 9:57PM0.37m | 1:10PM0.78m | 11:42PM0.41m | 1:34PM0.81m | 00:29AM0.45m | 1:57PM0.83m | 1:09AM0.50m | ||||||||||
Low Tide | 00:51AM0.22m | 2:10AM0.23m | 3:54AM0.21m | 9:32PM0.37m | 5:06AM0.18m | 8:28PM0.36m | 5:55AM0.14m | 8:26PM0.35m | 6:35AM0.11m | 8:34PM0.32m | |||||||||||
 | |  |  | |  | | | | | | | | |  |  | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | 5 | 25 | 13 | 5 | 3 |
Temp °C | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 26 | 26 | 25 | 28 | 28 | 29 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 23 | 21 | 21 | 22 | 22 | 25 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 6 | S 12 | E 8 | NE 6 | NNE 7 | NE 7 | NE 7 | ESE 8 | SSW 16 | ESE 8 | SSW 16 | SSE 14 | ESE 10 | NW 11 | ESE 11 | NW 12 | SSW 13 | SSE 8 | SSE 7 | SSE 6 | SSW 14 |
| kJ | 43 | 11 | 80 | 39 | 38 | 119 | 112 | 7 | 50 | 22 | 25 | 41 | 193 | 32 | 186 | 21 | 18 | 19 | 9 | 14 | 21 |
Swell 2 Height (m) Direction Period (s) | S 12 | SSE 9 | NE 6 | E 8 | E 8 | SSW 17 | SSW 17 | SSW 16 | ESE 8 | SSE 15 | S 12 | WNW 12 | SSE 13 | SSW 15 | NW 12 | SSW 14 | WNW 11 | SSW 13 | SSW 12 | SSW 16 | S 18 |
| kJ | 11 | 8 | 58 | 57 | 54 | 27 | 29 | 25 | 14 | 42 | 12 | 30 | 35 | 22 | 35 | 37 | 12 | 16 | 15 | 25 | 25 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SW 16 | S 12 | ENE 7 | NE 7 | S 15 | S 15 | SSE 8 | S 13 | SSW 16 | WNW 14 | ESE 11 | NW 11 | SSE 13 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSW 16 | SSW 12 | SSE 12 |
| kJ | 8 | 11 | 11 | 4 | 12 | 17 | 17 | 7 | 14 | 26 | 19 | 12 | 32 | 18 | 34 | 17 | 14 | 14 | 25 | 14 | 13 |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 8 | — | — | — | — | — | ENE 7 | ENE 7 | ENE 6 | E 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 |
| kJ | 89 | 176 | — | — | — | — | — | 117 | 141 | 123 | 200 | 317 | 231 | 422 | 500 | 970 | 1046 | 720 | 476 | 341 | 303 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 17 | 17 | 15 | 16 | 0 | 16 | 17 | 17 | 41 | 48 | 46 | 206 | 206 | 153 | 144 | 122 | 122 | 41 | 17 | 41 |
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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