
Surf Forecasts:
Irmas/Leftpoint surf forecast from 3 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 21ft (6.5m), 15s period, SSW swell with onshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 23ft (7.0m), 14s period, SSW swell with 18,110 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 21ft (6.5m), 15s 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 Monday (Sep 07) at 8PM. The primary swell is predicted to be 6.5m and 15s period with a secondary swell of 3.0m and 12s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Irmas/Leftpoint in the next 16 days are 7.0m 14s and forecast to arrive on Monday (Sep 07) at 11PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 10s period and expected on Tuesday (Sep 08) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 21ft (6.5m) 15s |
| Best Surf | 8PM (Mon 7th Sep) | 21ft (6.5m) 15s |
| Most Powerful | 11PM (Mon 7th Sep) | 23ft (7.0m) 14s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cookin’ for the next couple of weeks at Irmas/Leftpoint. It’s a reef break, fairly consistent, and it likes an ESE swell. We’re in for a rocky start, but there might be a little window of clean waves if you’re patient.
Right off the bat, the surf is flat out ugly. Thursday the 3rd and Friday the 4th are a write-off: strong cross-shore wind from the ENE at 25 mph, whipping up a messy cross-chop. Swell is there, around 8 ft to 8 ft, but it’s short-period junk at 7 seconds, and the combined energy is moderate to strong (1070-1687), but it’s all for nothing with that wind. Don’t even bother.
Saturday the 5th and Sunday the 6th? Still a struggle. The wind drops a tad to 22 mph then 19 mph, but it’s still cross-shore and lumpy. The swell sizes hang around 8 ft to 8 ft, and the period stretches to 14 seconds on Saturday, which is proper groundswell. That long period (over 15 seconds is very long, so 14 seconds is significant) will make for better-shaped waves at this reef, but the lumpy cross-chop spoils it. The energy is strong (2654-3467), but the surf is just marginal at best. It’s a “maybe” for the die-hards, but not a standout.
Monday the 7th gets ugly again. We’ve got a risk of thunderstorms, cross-onshore wind, and a big jump in swell. The morning sees 10 ft from the SSW with a 14-second period, and the afternoon pumps up to 13 ft from the SSW with a 15-second period. That’s a massive groundswell, with combined energy roaring into the five-digit range (5650-10581). But with that fresh cross-onshore breeze, it’s just blown-out, lumpy chaos. This is expert-only, and even then, it’s not fun. For a reef break, the long-period SSW swell is a good direction match, but the wind kills it.
Tuesday the 8th starts to settle. The swell drops to 7 ft in the morning, still messy, but by the afternoon the wind swings to SSW at 12 mph, and it’s a cross-shore. The swell drops to 3 ft, but the period is 15 seconds – very long period groundswell. The energy is moderate (961). It’s marginal, but at least it’s not a total loss.
Now, here’s the standout. Wednesday morning, September 9th. This is the one to circle. The wind goes glassy – literally, “glass” – from the NE at 3 mph. The swell is 4 ft from the ENE with an 8-second period, which is short, but the combined energy is weak (261). But that glassy conditions? That’s surfing perfection on a small day. The reef will smooth it out, and you’ll have clean, peelable waves. It’s not big, but it’s the best quality on offer. Crowds are possible at this spot, especially on a day like this. After that, the afternoon gets a risk of thunderstorms and a cross-onshore wind, so make the most of the morning.
The rest of the outlook is a mixed bag. Thursday the 10th through Sunday the 13th sees moderate to fresh cross-shore winds, with swell sizes ranging from 4 ft to 8 ft. The period is long (12-14 seconds) on the 10th and 11th, so there’s energy (up to 1423), but the wind keeps it lumpy. Monday the 14th and Tuesday the 15th see a big spike in swell again – 12 ft to 16 ft from the ENE with 10-11 second periods. That’s heavy, with combined energy hitting 5938 and 6065. But the wind is cross-shore or cross-onshore, and at 16 ft, that’s massive, dangerous, and blown out. For experts only, and even then, it’s not quality. The long period (11 seconds) is good, but the size and wind make it a beast.
Wednesday the 16th to Friday the 18th is more of the same: strong cross-shore winds, ENE swell from 8 ft to 10 ft, short to moderate periods (8-9 seconds), and energy dropping from 2512 to 810. It’s poor to marginal at best.
So, for the whole 16-day window, the one true standout is Wednesday morning, September 9th. Glassy conditions and a clean 4 ft swell. It’s not a monster, but it’s the only time the stars align for a really good session. Everything else is blown out, lumpy, or too big and messy. If you’re a patient soul, or you’ve got a kiteboard, the bigger days mid-month might be more your speed for a tow, but for paddle surfing, that Wednesday morning glass-off is your best bet.
Be safe out there and keep your eyes on the horizon.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 25°C on Wed night). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Sun night. Warm (max 27°C on Mon afternoon, min 24°C on Sun night). Winds increasing (light winds from the E on Sun night, near gales from the SSE by Mon night). | ||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 14 | E 14 | ENE 14 | ENE 14 | ENE 13 | ENE 12 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 11 | SSW 9 | S 9 | SSW 14 |
Wave Graph | |||||||||||||||||||
763 | 573 | 710 | 529 | 653 | 797 | 890 | 2180 | 2187 | 1960 | 1593 | 1733 | 2673 | 3151 | 7390 | 7207 | 724 | 376 | 289 | |
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-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off |
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 | |||||||
Low Tide | 00:39AM0.05m | 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 | |||||||
— | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | |
6:45 | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 12 | 1 | 5 | 9 | 2 | — | 1 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 |
Feels °C | 21 | 22 | 21 | 20 | 20 | 21 | 21 | 24 | 24 | 25 | 26 | 24 | 26 | 24 | 26 | 23 | 26 | 28 | 31 |
Swell 1 Height (m) Direction Period (s) | S 15 | S 14 | SSE 12 | S 12 | S 12 | E 14 | E 14 | S 12 | S 12 | ENE 13 | SSW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | ENE 12 | ENE 10 | S 9 | ENE 8 |
275 | 206 | 210 | 309 | 444 | 797 | 890 | 454 | 472 | 1960 | 1193 | 1733 | 2673 | 3151 | 7390 | 1379 | 490 | 348 | 169 | |
Swell 2 Height (m) Direction Period (s) | E 13 | E 13 | S 14 | E 14 | E 13 | S 11 | S 11 | SW 18 | SSW 18 | S 12 | SSE 10 | SSE 10 | N 9 | NW 15 | NNW 13 | NNW 12 | W 9 | ENE 9 | S 9 |
167 | 160 | 150 | 412 | 507 | 363 | 240 | 78 | 120 | 694 | 19 | 37 | 7 | 8 | 18 | 15 | 299 | 237 | 198 | |
Swell 3 Height (m) Direction Period (s) | S 11 | SSE 12 | E 16 | SSW 13 | SW 18 | SW 13 | S 13 | NNE 10 | NNE 10 | SW 16 | N 10 | N 10 | NW 16 | N 9 | NNW 14 | — | SSW 15 | SSW 15 | SSW 14 |
37 | 131 | 43 | 17 | 12 | 7 | 130 | 20 | 19 | 66 | 8 | 8 | 10 | 2 | 18 | — | 397 | 376 | 289 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 14 | — | ENE 12 | ENE 12 | ENE 12 | ENE 13 | ENE 13 | SSW 11 | SSW 9 | — | — |
763 | 573 | 710 | 529 | 653 | 527 | 484 | 2180 | 2187 | — | 1593 | 1697 | 1898 | 2499 | 3191 | 7207 | 724 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 60 | 112 | 62 | 56 | 62 | 110 | 56 | 50 | 50 | 49 | 49 | 49 | 18 | 110 | 107 | 131 | 30 | 7 | 0 |
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.










