Surf Forecasts:
Irmas/Leftpoint surf forecast from 13 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 5PM (local time) - 7ft (2.2m), 10s period, ENE swell with 904 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 2.2m 10s and forecast to arrive on Thursday (Sep 17) 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 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 | 5PM (Thu 17th Sep) | 7ft (2.2m) 10s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the lowdown in feet and miles per hour.
Mate, I’m not gonna sugarcoat it. This entire 16-day window is a rough one for Irmas/Leftpoint. The trade winds are gonna be blowing from the ENE nearly non-stop, and they’re not light either. That’s going to put a nasty chop on the water and wreck the wave faces at this reef. The water temp is 81°, pretty normal for this time of year.
Right out of the gate on Sunday, September 13th, and through the first week, the surf is small and sloppy. We’re talking waist to chest-high waves (3 ft to 4 ft) from the NNE or NE, with short periods of 6 to 9 seconds. The wind is cross-shore the whole time, so it’s just messy. Not worth getting wet for.
Mid-week on Wednesday, September 16th, a new, longer-period groundswell tries to push in from the SSW (18 seconds) but the height drops to just 3 ft while the wind is still cross.
The size picks up big time from Thursday, September 17th, with waves reaching 7 ft to 7 ft from the ENE. The wave energy gets strong (in the 1000+ range), but that ENE cross-wind is now blowing a fresh to strong breeze (25-28 mph), making it a washing machine out there.
Friday, September 18th, is the first time we see a ‘marginal’ score. The morning is poor, but the afternoon shows a 3 ft swell from the SSW with a 17-second period and the wind is cross. The energy is huge (over 1100), but the wind chop is still there.
The best chance for some decent power comes around Monday, September 23rd. The swell from the east picks up to 7 ft to 7 ft with a period of 10-11 seconds. The energy is very strong (1266). The wind is still from the ENE at 22 mph, so it’s still a cross-shore mess, but the size and period are the best of the whole period. This is expert territory only – 7 ft waves with chop are no joke.
The tail end of the forecast, from September 24th to 28th, is a rinse-repeat of the same: 5 ft to 8 ft swell from the ENE or NE, with the wind staying fresh to strong and cross or cross-onshore. The energy stays high, but the quality stays poor to marginal.
So here’s the deal: there are no clean, all-day sessions in this 16-day stretch. The wind is the main problem. If you’re absolutely jonesing for a paddle and you’re a strong surfer, the 23rd of September has the biggest, most powerful swell. It’s the best on offer, but it’s still a battle with the wind. That’s the honest truth. Rusty out.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 25°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Fri morning. Warm (max 27°C on Fri morning, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | SSW 13 | NE 8 | NE 8 | SSW 19 | ENE 6 | SSW 18 | ENE 6 | ENE 10 | ENE 10 | ENE 9 | SSW 17 | SSW 17 | E 8 | E 8 | ENE 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 135 | 138 | 115 | 100 | 80 | 68 | 88 | 128 | 470 | 97 | 541 | 213 | 846 | 904 | 724 | 622 | 580 | 573 | 522 | 497 | 653 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on |
High Tide | 4:10PM0.44m | 5:15AM0.59m | 4:37PM0.37m | 6:02AM0.58m | 5:04PM0.30m | 6:56AM0.56m | 5:30PM0.25m | 8:04AM0.54m | 6:18PM0.21m | 9:21AM0.54m | 9:37PM0.19m | 10:30AM0.55m | 11:10PM0.22m | ||||||||
Low Tide | 10:58AM0.16m | 10:34PM0.05m | 11:57AM0.20m | 10:58PM0.06m | 1:10PM0.23m | 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 | |||||||
 | |  | | |  |  | | | | | | | |  |  | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 4 | — | — | 1 | — | — |
Temp °C | 25 | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 24 | 24 | 24 | 24 | 25 | 24 | 26 | 26 | 26 | 25 | 24 | 25 | 24 | 24 | 25 | 26 | 25 | 25 | 26 | 24 | 26 |
Swell 1 Height (m) Direction Period (s) | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | NE 8 | SW 20 | SW 20 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 |
| kJ | 135 | 138 | 115 | 100 | 80 | 51 | 392 | 388 | 470 | 455 | 541 | 429 | 261 | 258 | 651 | 622 | 580 | 539 | 382 | 387 | 350 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | SSW 15 | SW 12 | SSW 14 | SW 22 | SW 21 | ENE 6 | E 12 | NNE 8 | E 10 | E 10 | E 10 | SSW 20 | SSW 19 | SSE 10 | SSE 10 | SSE 8 | SSE 6 | SSW 18 | S 18 | SW 16 |
| kJ | 82 | 84 | 38 | 77 | 227 | 224 | 29 | 66 | 32 | 73 | 128 | 123 | 152 | 210 | 9 | 9 | 13 | 14 | 108 | 99 | 122 |
Swell 3 Height (m) Direction Period (s) | SW 15 | SW 12 | ENE 8 | SSW 24 | SW 14 | SSW 13 | E 12 | SW 12 | E 11 | SW 12 | SW 11 | SSW 11 | SW 11 | SSW 10 | WSW 8 | W 9 | S 21 | S 20 | SSE 6 | SSE 8 | SSW 14 |
| kJ | 107 | 23 | 13 | 54 | 49 | 68 | 46 | 38 | 58 | 35 | 31 | 12 | 18 | 10 | 7 | 2 | 36 | 67 | 7 | 14 | 37 |
Wind waves Height (m) Direction Period (s) | ENE 4 | E 9 | E 4 | E 5 | ENE 5 | ENE 5 | NE 8 | NE 8 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 10 | ENE 10 | ENE 9 | E 8 | E 8 | E 8 | E 8 | ENE 8 | E 8 |
| kJ | 6 | 54 | 17 | 15 | 27 | 56 | 88 | 128 | 66 | 97 | 127 | 213 | 846 | 904 | 724 | 588 | 535 | 573 | 522 | 497 | 653 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 18 | 18 | 49 | 18 | 18 | 18 | 20 | 20 | 49 | 109 | 49 | 109 | 109 | 49 | 49 | 56 | 49 | 51 | 49 | 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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