
Surf Forecasts:
Irmas/Leftpoint surf forecast from 4 Sep 2026:
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 11ft (3.5m), 12s period, SSW swell with 3,443 kJ wave energy.
Best Forecast Surf Conditions for Irmas/Leftpoint this week:
The most powerful waves expected at Irmas/Leftpoint in the next 16 days are 3.5m 12s and forecast to arrive on Tuesday (Sep 08) 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 4.5m 14s period and expected on Monday (Sep 07) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Tue 8th Sep) | 11ft (3.5m) 12s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Hey, Rusty here. Let’s call it like it is – this is a tough run of surf for our area. The wind is a relentless bugger, and even when there’s size, it’s just getting blown to bits. You’re looking at a solid 10-day gap with nothing worth waxing up for. There’s a tiny flicker of hope at the very end, but it’s a long way off.
We’re talking about Irmas/Leftpoint. It’s a reef, usually breaks fairly consistently, and loves an ESE swell, but that’s where the good news ends. Water temp is about normal for this time of year.
Friday the 4th starts with a 8ft ENE swell at a short 7 seconds, but a strong 25 mph cross-wind from the ENE has it all messy. Afternoon drops to 5ft but the period jumps to 14 seconds – a nice groundswell – but the wind is still cross at 22 mph. Saturday the 5th, the swell pushes to 8ft in the morning, 13-second period, with a 19 mph cross-wind. The afternoon is a touch better with 8ft, 14-second swell, but the wind is 22 mph and cross. The energy is strong (3456), but it’s a waste. Sunday the 6th, 7ft, 12-second swell, but the wind goes cross-onshore and it’s lumpy. Storm risk is there.
Monday the 7th, the swell is 8ft, 12 seconds, but it’s cross-onshore with thunderstorms. Tuesday the 8th drops to 6ft then 5ft, wind backs off a bit but it’s still cross-onshore and choppy. Wednesday the 9th, the swell drops to 3ft, wind still up. Energy is weak. Thursday the 10th, a quick spike to 5ft in the morning with a short 7-second period, but the wind is fresh and cross. No good.
This pattern of solid swell and bad wind just keeps going. The 8ft stuff on the 7th and 15th is too big for beginners, and with that wind, it’s only for the hardcore. That 14-second period swell on the 5th afternoon would be magic at a point, but here with the cross-wind, it’s a blown-out flop.
The only real standout is right at the end. On Thursday the 17th, the swell drops to 3ft, but the direction swings to SSW with a very long 16-second period. That’s a proper groundswell. The wind is still cross at 22 mph, but the energy is low. Friday the 18th is similar, 3ft to 3ft with the same long period. Saturday the 19th, the swell goes back to a short 8-second ENE. This long-period SSW window is our best bet, but it’s tiny and the wind is a problem. It’s a long-range hope, so keep your expectations low.
For the next ten days, honestly, leave the board in the garage. The wind is too strong and too cross for this spot. If you’re really keen, maybe the 8th or 9th have the smallest window, but it’s marginal. This setup is more interesting for a kite surfer than a paddle surfer with that strong cross-shore wind. The long period SSW groundswell at the end is promising, but it’s a one-star show. Keep an eye on it, but don’t plan your life around it.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun afternoon. Warm (max 26°C on Thu night, min 25°C on Thu night). Winds decreasing (strong winds from the ENE on Fri morning, moderate winds from the ENE by Sun afternoon). | Days 5-7 Weather SummaryHeavy rain (total 21mm), heaviest during Sun night. Warm (max 27°C on Mon morning, min 24°C on Sun night). Winds decreasing (fresh winds from the S on Mon night, light winds from the ESE by Tue night). | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 7 | ENE 7 | E 14 | ENE 14 | ENE 13 | ENE 14 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | SSW 12 | ENE 11 | ENE 10 | SSW 14 | E 14 | E 13 | E 13 |
Wave Graph | |||||||||||||||||||
639 | 590 | 797 | 2376 | 2116 | 1819 | 1687 | 1360 | 1316 | 1595 | 1999 | 2065 | 3443 | 732 | 402 | 356 | 311 | 284 | 219 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | cross | cross | cross-on |
High Tide | 9:55AM0.64m | 9:27PM0.19m | 11:03AM0.68m | 11:10PM0.21m | 12:00PM0.71m | 00:14AM0.26m | 12:48PM0.73m | 1:03AM0.31m | 1:30PM0.72m | 1:48AM0.38m | 2:07PM0.69m | 2:29AM0.44m | |||||||
Low Tide | 1:39AM0.06m | 6:33PM0.16m | 3:03AM0.07m | 7:10PM0.12m | 4:28AM0.06m | 7:41PM0.09m | 5:40AM0.04m | 8:09PM0.07m | 6:40AM0.03m | 8:36PM0.05m | 7:34AM0.03m | 9:01PM0.04m | |||||||
— | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | |
6:45 | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | |
mm | — | — | — | — | — | — | — | — | 4 | 9 | 2 | 1 | 3 | 2 | 2 | 2 | — | — | 1 |
Temp °C | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 |
Feels °C | 22 | 21 | 20 | 21 | 24 | 24 | 25 | 25 | 25 | 26 | 28 | 27 | 26 | 27 | 28 | 31 | 27 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 12 | S 13 | S 12 | S 12 | ENE 14 | SSW 12 | SSW 12 | SSW 14 | SW 14 | SW 15 | SW 15 | ENE 12 | ENE 11 | SSW 8 | ENE 8 | ENE 8 | E 13 | E 13 |
414 | 521 | 649 | 529 | 672 | 1819 | 706 | 905 | 1314 | 1349 | 2860 | 5403 | 1379 | 732 | 313 | 222 | 138 | 284 | 219 | |
Swell 2 Height (m) Direction Period (s) | E 14 | E 13 | E 14 | NNE 11 | NNE 10 | SSW 12 | N 9 | SSE 9 | SSE 10 | SSW 18 | SSW 17 | ENE 12 | SSW 15 | W 10 | ENE 10 | SSW 8 | E 14 | SSW 13 | SSW 13 |
334 | 426 | 797 | 12 | 20 | 768 | 13 | 17 | 32 | 437 | 487 | 2065 | 596 | 219 | 402 | 146 | 311 | 204 | 176 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 12 | SW 13 | SSW 20 | NNE 10 | NNE 10 | SSE 10 | N 8 | S 19 | SSE 9 | NW 15 | SSW 17 | NNW 12 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 7 | S 7 |
12 | 6 | 7 | 38 | 21 | 19 | 10 | 10 | 180 | 28 | 8 | 625 | 15 | 474 | 371 | 356 | 273 | 43 | 24 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | — | SSW 12 | SSW 9 | — | — | — | ENE 7 | ENE 7 |
639 | 590 | 456 | 2376 | 2116 | 850 | 1687 | 1360 | 1316 | 1595 | 1999 | — | 3443 | 579 | — | — | — | 147 | 197 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 56 | 60 | 56 | 49 | 49 | 51 | 20 | 49 | 18 | 18 | 41 | 61 | 57 | 57 | 2 | 4 | 18 | 18 | 49 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Irmas/Leftpoint Surf forecast
The above surf forecast table for Irmas/Leftpoint provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Irmas/Leftpoint can be found by selecting the local surf guide option on the grey menu. Our Irmas/Leftpoint 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 (Irmas/Leftpoint) 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 Irmas/Leftpoint 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.
Irmas/Leftpoint is 15 km (9 miles) from the city of 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.










