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 3,751 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 cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 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, folks, Rusty here. Let's be straight with you. The next couple of weeks are looking pretty grim for a proper paddle. We've got a solid run of onshore and cross-onshore winds messing up what little swell is out there. It's going to be a waiting game.
Right out of the gate, this Saturday morning (August 15th), it’s a write-off. We're looking at a blustery 31 mph onshore breeze and a lumpy 12ft of easterly windswell. That’s not surf; that’s a washing machine. The energy is strong, but it’s all over the shop, and the weather gods are throwing rain showers and even a thunderstorm risk at us. Not the time.
The whole first week is pretty much the same story. We’ve got surf, but it’s poor quality. The wind stays mostly cross-onshore from the east-northeast, chopping up everything. The swell eases off from that initial pulse down to a dribble by the middle of the week. The water temp is sitting at 81° which is about average for this time of year, so when it does glass off, you won't need a thick suit.
There's a glimmer on the 19th and 20th, but it's too small to get excited about and the wind is still messy. Nothing on offer here. This is a stretch where you’re better off finding something else to do. The conditions stay poor through the 21st and into the next weekend, with tiny, weak swell and onshore breezes. It’s a long, frustrating stretch with no real windows.
Now, pay attention, because things start to get interesting in the second week. The energy starts to build again from the 26th and 27th of August. It’s still coming from the east, but this is looking more promising. We’re seeing some longer period energy (17-18 seconds), which means proper groundswell, but it’s still going to be fighting that onshore wind. With that size, over 5ft, it's already pushing past the beginner zone, and it's going to be a bit of a handful, especially as the onshore wind will keep it bumpy. The wave energy kicks up to a strong 1580 on the Thursday morning. The potential is there for Kailua Beach to have some shape on the points, but we need that wind to ease off.
The real standout is shaping up for the 30th of August. We've got a bigger pulse, with swell expected to hit 8ft to 10ft from the east-northeast. The energy is going to be very strong, with values jumping over 2452. This is a lot of water moving. Keep in mind, this size is not for the faint-hearted, this is expert territory. The issue is, the wind is still forecast to be on it. So, it might be a case of the swell being there but the conditions being a full-on battle. If the wind was offshore, it would be absolutely firing, but as it stands, this is a promise of size, not necessarily of clean waves. This spot is a point break, and with that long-period energy, it could line up. But with that onshore wind, expect it to be a heavy, challenging session. Don't bring the log. In fact, if this forecast holds, the east-facing beaches here might be more interesting for the kite surfing crew than for us paddle surfers.
Overall, there is almost nothing on the cards for the next week, and the second week is all about one big, promising, but wind-blown pulse at the end. Lock in your gear for the 30th and keep your fingers crossed for a shift in the wind.
Rusty.
Short Range ForecastHeavy rain (total 40mm), heaviest during Sun morning. Warm (max 26°C on Sat afternoon, min 24°C on Mon night). Winds decreasing (near gales from the ENE on Sat night, moderate winds from the E by Sun afternoon). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed night. Warm (max 25°C on Tue morning, min 24°C on Tue night). 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 | ENE 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | NE 7 | NE 7 |
Wave Graph | |||||||||||||||||||||
1811 | 2746 | 3118 | 1093 | 748 | 472 | 302 | 252 | 178 | 118 | 106 | 114 | 144 | 84 | 63 | 76 | 54 | 43 | 45 | 45 | 48 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | cross-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 | 3 | 2 | 8 | 14 | 8 | 5 | — | — | — | — | — | — | — | — | 1 | 2 | 1 | — | — | — | 1 |
Temp °C | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 |
Feels °C | 22 | 22 | 21 | 23 | 28 | 26 | 24 | 25 | 24 | 25 | 24 | 24 | 26 | 26 | 26 | 26 | 27 | 27 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 14 | SSE 9 | SSE 8 | S 7 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | NE 7 | NE 7 |
55 | 31 | 62 | 116 | 92 | 23 | 103 | 65 | 55 | 54 | 30 | 29 | 144 | 84 | 63 | 76 | 54 | 43 | 45 | 45 | 48 | |
Swell 2 Height (m) Direction Period (s) | NNW 8 | S 16 | S 18 | S 16 | S 13 | S 13 | SSE 6 | S 6 | E 9 | SW 17 | SW 18 | ENE 8 | NNE 6 | NE 6 | S 12 | NE 6 | NNE 6 | NNE 6 | E 9 | E 8 | E 8 |
7 | 5 | 25 | 47 | 30 | 55 | 8 | 3 | 15 | 11 | 12 | 6 | 13 | 42 | 11 | 40 | 26 | 27 | 23 | 22 | 22 | |
Swell 3 Height (m) Direction Period (s) | S 20 | S 19 | SW 16 | S 12 | S 16 | S 16 | N 8 | N 7 | N 7 | N 7 | N 7 | N 7 | NE 7 | S 12 | S 9 | SSW 18 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 |
7 | 7 | 10 | 25 | 46 | 45 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | 11 | 6 | 31 | 30 | 27 | 29 | 25 | 50 | |
Wind waves Height (m) Direction Period (s) | ENE 9 | ENE 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | NE 7 | — | NE 6 | — | — | — | — | E 3 | E 4 |
1811 | 2746 | 3118 | 1093 | 748 | 472 | 302 | 252 | 178 | 118 | 106 | 114 | 38 | — | 56 | — | — | — | — | 1 | 8 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 153 | 206 | 123 | 44 | 17 | 17 | 41 | 41 | 17 | 41 | 18 | 17 | 41 | 17 | 17 | 17 | 17 | 15 | 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.
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.











