Surf Forecasts:
Irmas/Leftpoint surf forecast from 16 Sep 2026:
- Most powerful swell: Wednesday 23 Sep, 2AM (local time) - 8ft (2.5m), 10s period, E swell with 1,461 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 2.5m 10s and forecast to arrive on Wednesday (Sep 23) at 2AM. 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 18s period and expected on Wednesday (Sep 16) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Wed 23rd Sep) | 8ft (2.5m) 10s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it.
Well, to be straight with you, we are looking at a grim run of it for Irmas/Leftpoint over the next 16 days. The wind is just not letting up. The whole period is plagued by a strong, constant cross-shore breeze that’s going to leave the ocean looking like a washing machine. There is wave energy for sure, but the quality is just not there for a good paddle session.
We start on Wednesday the 16th. The morning has a 4 ft NE swell, but the period is a short 6 seconds (combined energy 205), so it's mostly close-outs. The wind is a stiff 19 mph cross-shore from the ENE, making it lumpy. That afternoon, the swell drops to 3 ft but comes from the SSW with a very long 18-second period (combined energy 844), but again, that cross-shore wind ruins it. We get some bigger swell on Thursday the 17th pushing 7 ft from the ENE (10-second period), but the wind is up to 22 mph. It’s a similar story for Friday the 18th.
There is a lot of swell energy. By Saturday the 21st of September, the swell is hitting 8 ft from the E with an 8-second period. The combined swell energy is strong on the 22nd at 1248, but it doesn't matter when it's accompanied by a 28 mph cross-shore wind. It gets properly gnarly on Wednesday the 23rd of September with a near gale blowing 34 mph and the swell at 8 ft. The waves will be strong, but it will be a complete mess for paddle surfing.
The second week doesn’t offer much of a reprieve. The forecast continues to show a steady stream of ENE swell, generally between 6 ft and 8 ft, but the wind is relentless. On Saturday the 27th and Sunday the 28th we see a few periods with lighter winds, but it is still cross-onshore, which just isn't clean.
There is one final note. On Sunday the 27th of September morning, the wind drops to a gentle 9 mph from the E, and the swell is a solid 7 ft. That's the closest thing to a window we get, but the wind direction is still cross-onshore. It would be a gamble.
Honestly, with that much wind and swell, this setup looks more interesting for kite surfing than for a surf session. There just aren’t any standouts here worth paddling out for.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu night. Warm (max 27°C on Fri morning, min 26°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri night, min 25°C on Sat night). Mainly strong winds. | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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) | SSW 19 | NE 6 | SSW 18 | SSW 17 | ENE 10 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | E 8 | E 8 | E 7 | ENE 7 | ENE 8 | ENE 8 | E 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 470 | 105 | 541 | 516 | 815 | 737 | 644 | 622 | 580 | 539 | 437 | 522 | 601 | 524 | 456 | 469 | 611 | 815 | 766 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross |
High Tide | 6:56AM0.56m | 5:30PM0.25m | 8:04AM0.54m | 6:18PM0.21m | 9:21AM0.54m | 9:37PM0.19m | 10:30AM0.55m | 11:10PM0.22m | 11:25AM0.57m | 11:56PM0.25m | 12:07PM0.59m | 00:31AM0.29m | |||||||
Low Tide | 11:24PM0.09m | 2:59PM0.23m | 11:56PM0.11m | 5:49PM0.21m | 00:44AM0.14m | 6:28PM0.17m | 2:11AM0.15m | 6:51PM0.15m | 3:49AM0.15m | 7:13PM0.13m | 5:00AM0.13m | 7:32PM0.11m | |||||||
 |  | |  |  |  | | | |  | | | | | | | | | | |
 | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:32 | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:29 | — | — | 6:28 | — |
mm | 2 | — | — | — | — | 1 | 6 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 26 | 26 | 25 | 25 | 26 | 24 | 26 | 25 | 25 | 25 | 25 | 23 | 24 | 24 | 23 | 24 | 24 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | NNE 7 | SW 18 | SSW 18 | SSW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | S 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 13 |
| kJ | 70 | 455 | 541 | 516 | 261 | 258 | 644 | 622 | 580 | 539 | 382 | 387 | 273 | 218 | 300 | 280 | 254 | 189 | 168 |
Swell 2 Height (m) Direction Period (s) | SSW 19 | E 10 | E 10 | SSW 11 | SSW 20 | SSW 19 | SW 10 | SSE 10 | SSE 8 | S 20 | SSW 18 | S 18 | SW 16 | SSW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 |
| kJ | 470 | 100 | 133 | 12 | 149 | 210 | 4 | 9 | 11 | 30 | 108 | 99 | 121 | 154 | 104 | 33 | 54 | 46 | 46 |
Swell 3 Height (m) Direction Period (s) | E 11 | SW 12 | SW 11 | WSW 9 | SW 11 | SSW 10 | SSE 10 | W 9 | WSW 9 | SSE 9 | SSE 6 | SSE 6 | SSW 14 | SSE 8 | N 11 | NNW 11 | NNW 10 | NNW 10 | W 13 |
| kJ | 58 | 35 | 31 | 8 | 18 | 10 | 9 | 2 | 8 | 7 | 7 | 3 | 37 | 6 | 2 | 11 | 10 | 10 | 13 |
Wind waves Height (m) Direction Period (s) | E 6 | NE 6 | NE 6 | ENE 7 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | E 8 | E 8 | E 7 | ENE 7 | ENE 8 | ENE 8 | E 8 | ENE 8 |
| kJ | 50 | 105 | 170 | 316 | 815 | 737 | 561 | 484 | 427 | 471 | 437 | 522 | 601 | 524 | 456 | 469 | 611 | 815 | 766 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 46 | 49 | 49 | 49 | 56 | 49 | 56 | 56 | 49 | 50 | 56 | 49 | 56 | 56 | 49 | 56 | 56 | 49 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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.
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