
Surf Forecasts:
Irmas/Leftpoint surf forecast from 4 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 14s period, SSW swell with 11,821 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period with SSW swell.
Best Forecast Surf Conditions for Irmas/Leftpoint this week:
The surf forecast for Irmas/Leftpoint over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 09) at 5AM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.9m and 14s. Another secondary swell of 0.9m and 8s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Irmas/Leftpoint in the next 16 days are 5.5m 14s and forecast to arrive on Monday (Sep 07) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 15s period and expected on Monday (Sep 07) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Best Surf | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Most Powerful | 8PM (Mon 7th Sep) | 18ft (5.5m) 14s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, let’s swap to feet and Fahrenheit for the imperial crew. Same spot, same story.
Water temp is 81°F, about normal for this time of year.
We’re looking at Irmas/Leftpoint, a reef break, and the next 16 days are a real grind. The first chance to surf is Saturday, September 5th, but it’s marginal. Thursday the 3rd and Friday the 4th are a total washout: 8ft to 8ft swell from the ENE, a short period of 7 seconds, and a strong cross-shore wind at 25 mph. Combined energy is moderate (1068–1464), but it’s messy cross-chop. No fun.
Saturday the 5th brings a 8ft ENE swell with a period of 13 seconds, energy up to 2564, but the wind is still a fresh cross-shore at 22 mph, creating lumpy chop. It’s the best of the first week, but far from perfect. The swell direction (ESE optimum) doesn’t match well, though the longer period gives some shape.
Sunday the 6th is risk t-storms with 8ft to 8ft ENE swell (12 seconds, energy 2704–3143), and a moderate cross-onshore wind makes it choppy. Monday the 7th sees a 10ft to 18ft SSW swell with a very long 15-second period, and the afternoon hits 18ft with energy up to 16735, but onshore winds at 25 mph. That’s too big and dangerous—only for experts, and even then, the wind ruins it. Kite surfers might love it, but paddle surfers should stay away.
Tuesday the 8th drops to 6ft to 5ft, short period (9 seconds), and cross-onshore wind. Marginal. From Wednesday the 9th to Thursday the 10th, the swell plummets to under 3ft, and the wind is fresh cross-shore or cross-onshore. Not worth it.
Friday the 11th shows a bounce: 7ft to 7ft ENE swell with a 13 to 12-second period, and moderate cross-shore wind. Energy is around 1292–1346, still marginal, but cleaner than earlier.
The real standouts are Sunday the 13th and Monday the 14th of September. Sunday the 13th has 8ft to 8ft ENE swell with an 8-second period, but the wind is a moderate cross-offshore from the NNE at 16 mph—clean! Energy is moderate (720–800). The wave comment says “clean.” This is your best window. Crowds are “sometimes,” so expect a few people.
Monday the 14th is also solid: 8ft ENE swell, same short period, but the wind is a light breeze at 6 mph, with only small wind ripples. Energy is moderate (1024–1232). This is clean and rideable for intermediates. The 8ft swell is over 5ft, so beginners might struggle.
After that, Tuesday the 15th sees a weird shift: only 3ft swell but with a very long 21-second period from the SSW, energy 1481. It’s a groundswell, but it’s breaking straight at a beach break with cross-shore wind. A tease. Wednesday the 16th and Thursday the 17th are back to poor conditions with 6ft to 5ft short-period slop and fresh cross-winds.
So, best bet: Sunday the 13th and Monday the 14th, with clean winds and consistent 8ft to 8ft swell. The rest is mostly messy or too big. Keep checking the forecasts—it’s a rough run, but that window is worth setting the alarm for.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 25°C on Thu morning). Mainly strong winds. | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Sun afternoon. Warm (max 27°C on Mon morning, min 24°C on Sun night). Winds decreasing (strong winds from the SSE on Mon night, calm by Tue night). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 7 | E 14 | E 14 | ENE 13 | ENE 14 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | SSW 14 | SSW 15 | S 10 | ENE 10 | SSW 15 | SSW 14 | SSW 14 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
671 | 498 | 574 | 527 | 797 | 2570 | 1951 | 1873 | 2091 | 1670 | 1617 | 1757 | 3183 | 11631 | 1916 | 559 | 376 | 356 | 273 | 294 | 557 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | cross-on | on | cross | cross | cross |
High Tide | 8:36AM0.61m | 7:01PM0.22m | 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 | 5:18PM0.21m | 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 | — | — | 6:13 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | 2 | 5 | 1 | 1 | 6 | 2 | 1 | — | 1 | — | — |
Temp °C | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 |
Feels °C | 23 | 22 | 21 | 20 | 20 | 21 | 24 | 24 | 25 | 25 | 25 | 25 | 27 | 27 | 23 | 27 | 29 | 30 | 28 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | S 14 | SSE 12 | S 12 | S 12 | E 14 | S 11 | S 12 | SSW 12 | SSW 12 | SSW 12 | SSW 13 | SSW 14 | SSW 14 | ENE 12 | ENE 12 | SSW 9 | ENE 9 | ENE 8 | SSW 14 | E 13 | E 13 |
206 | 210 | 294 | 504 | 797 | 361 | 472 | 569 | 820 | 688 | 1283 | 1686 | 3183 | 1999 | 1426 | 455 | 348 | 262 | 273 | 222 | 168 | |
Swell 2 Height (m) Direction Period (s) | E 13 | E 12 | E 14 | E 13 | S 12 | NNE 11 | SSW 17 | SSW 18 | N 11 | SSW 16 | SSE 10 | S 18 | SSW 17 | SSW 17 | WSW 11 | ENE 10 | SSW 8 | SSW 8 | E 13 | SSW 13 | SSW 13 |
160 | 145 | 412 | 426 | 496 | 12 | 117 | 121 | 9 | 430 | 19 | 240 | 394 | 589 | 1016 | 559 | 212 | 119 | 222 | 204 | 135 | |
Swell 3 Height (m) Direction Period (s) | SSE 12 | S 14 | SSW 13 | SW 12 | SW 13 | SSW 20 | NNE 10 | NNE 10 | N 9 | SSE 10 | N 10 | S 10 | NW 15 | NNW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 8 | NW 10 | NNW 10 |
131 | 150 | 17 | 6 | 7 | 37 | 20 | 19 | 13 | 19 | 8 | 49 | 8 | 18 | 505 | 397 | 376 | 356 | 63 | 74 | 36 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 14 | ENE 13 | ENE 14 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | ENE 13 | SSW 15 | S 10 | — | — | — | ENE 8 | ENE 7 | ENE 7 |
671 | 498 | 574 | 527 | 512 | 2570 | 1951 | 1873 | 2091 | 1670 | 1617 | 1757 | 2257 | 11631 | 1916 | — | — | — | 264 | 294 | 557 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 62 | 60 | 56 | 60 | 60 | 49 | 49 | 56 | 49 | 49 | 49 | 49 | 110 | 108 | 125 | 4 | 2 | 1 | 18 | 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.










