
Surf Forecasts:
Irmas/Leftpoint surf forecast from 15 Sep 2026:
- Most powerful swell: Monday 21 Sep, 11PM (local time) - 8ft (2.5m), 9s period, E swell with 1,064 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 9s and forecast to arrive on Monday (Sep 21) at 11PM. 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 | 11PM (Mon 21st Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Howdy, Rusty here. Let’s have a look at what Irmas/Leftpoint is serving up for the next couple of weeks. Straight off the bat, this ain’t a quick start – the first week is pretty ugly with onshore winds and messy chop.
From Tuesday the 15th right through to Monday the 21st of September, the wind is a solid ENE at 18 to 25 mph, cross-shore, and it’s just wrecking the surface. The combined wave energy kicks off at a moderate 144, climbs into the hundreds, and even hits four digits, but it’s all lumpy cross-chop. Thursday the 17th has a 7ft ENE swell (period 10 seconds), but the wind’s fresh and cross-shore – not what you want on a reef. Water temp is 81°F, about normal for the time of year.
We got a real blank stretch for quality until the end of the month. The afternoon of the 16th does throw a 3ft SSW swell with a very long 18-second period and 725 energy, but the wind stays on it, so forget it.
Now, Wednesday the 23rd of September things start to change. Morning still has a 8ft E swell (period 10 seconds, energy 1503), wind drops to 6 mph, light cross – still a bit marginal. But that afternoon? That’s the one. A clean 8ft E swell, same period, wind shifts to a light WSW at 3 mph, giving us cross-off and clean conditions. Energy jumps to 1579 – strong, powerful. This is a reef point, so that 10-second period should hold the lines. This is for experienced surfers only, as the swell’s well over 8ft.
Thursday the 24th keeps it rolling – a 10ft E swell (period 9 seconds) with light cross-off breezes from WSW and W at 6 mph, dead clean. Energy stays high between 1312 and 1524. That’s proper groundswell territory, and the reef will turn it into something special. The crowd factor here says “sometimes” busy, but with waves this good, expect plenty of company.
Friday the 25th is a step down with a light cross-on, but still 8ft swell. Then Saturday the 26th is another gun day – the morning is glassy with an 8ft ENE swell (period 8 seconds), a light SE breeze giving a flat surface, energy at 1034. The afternoon stays glassy with a 8ft ENE swell. The guidance calls it very good surf. Be ready for crowds.
Sunday the 27th gives you a smaller, glassy 3ft SSW groundswell (14-second period, energy 532) in the afternoon – not the optimum ESE direction for this break, but glassy is glassy. The morning is a marginal 6ft ENE with a cross-on breeze.
From the 28th to the 30th, it’s mostly marginal or poor as the wind swings back onshore or cross-shore, with energy dropping and chop building.
The standout windows are Thursday the 24th and Saturday the 26th of September. Thursday has the biggest, cleanest, most powerful swell (10ft E, light cross-off wind) – absolute gold for the experienced surfer. Saturday morning is a very close second with glassy conditions and solid 8ft ENE swell. Get in the water if you’re ready for it.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Thu night. Warm (max 26°C on Tue morning, min 26°C on Tue morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri morning, min 25°C on Sat night). Mainly strong winds. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 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) | NE 8 | NE 8 | SSW 19 | ENE 6 | SSW 18 | SSW 17 | ENE 10 | ENE 9 | SSW 18 | ENE 8 | SSW 17 | E 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 9 |
Wave Graph | |||||||||||||||||||||
75 | 84 | 470 | 116 | 541 | 516 | 869 | 713 | 644 | 681 | 580 | 745 | 548 | 627 | 628 | 611 | 607 | 675 | 599 | 787 | 987 | |
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-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross |
High Tide | 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 | 11:25AM0.57m | 11:56PM0.25m | 12:07PM0.59m | 00:31AM0.29m | ||||||||
Low Tide | 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 | 7:13PM0.13m | 5:00AM0.13m | 7:32PM0.11m | ||||||||
6:16 | — | — | 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 | 6 | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 27 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 24 | 23 | 24 | 24 | 23 | 22 | 23 | 22 | 22 | 23 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 20 | NE 8 | SSW 19 | SW 18 | SSW 18 | SSW 17 | SW 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | S 15 | SSW 15 | SSW 14 | S 14 | S 14 | S 13 |
392 | 84 | 470 | 455 | 541 | 516 | 261 | 322 | 644 | 622 | 580 | 539 | 382 | 387 | 273 | 218 | 300 | 280 | 243 | 179 | 168 | |
Swell 2 Height (m) Direction Period (s) | ENE 8 | SW 20 | E 11 | E 10 | SW 11 | SSW 11 | SSW 20 | SSW 19 | WSW 8 | SSE 9 | SSE 6 | S 20 | SSW 18 | S 18 | SW 16 | SSW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 |
23 | 388 | 58 | 73 | 31 | 12 | 149 | 210 | 7 | 8 | 7 | 30 | 108 | 99 | 121 | 154 | 104 | 33 | 54 | 46 | 46 | |
Swell 3 Height (m) Direction Period (s) | E 12 | E 12 | SW 12 | SW 12 | WSW 8 | WSW 9 | SW 11 | SSW 10 | SSE 10 | W 9 | WSW 9 | SSE 8 | SSE 8 | SSE 6 | SSW 14 | SSE 8 | SE 8 | NNW 10 | N 10 | NNW 10 | NNW 12 |
46 | 66 | 38 | 35 | 7 | 8 | 18 | 10 | 9 | 2 | 8 | 7 | 7 | 8 | 37 | 7 | 2 | 10 | 8 | 10 | 30 | |
Wind waves Height (m) Direction Period (s) | NE 8 | — | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 9 |
75 | — | 100 | 116 | 184 | 286 | 869 | 713 | 614 | 681 | 520 | 745 | 548 | 627 | 628 | 611 | 607 | 675 | 599 | 787 | 987 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 18 | 18 | 49 | 49 | 22 | 49 | 56 | 49 | 56 | 58 | 49 | 56 | 58 | 50 | 58 | 58 | 50 | 56 | 58 | 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.










