Surf Forecasts:
Irmas/Leftpoint surf forecast from 17 Aug 2026:
- Most powerful swell: Monday 17 Aug, 5AM (local time) - 6ft (1.8m), 8s period, ENE swell with 388 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 1.8m 8s and forecast to arrive on Monday (Aug 17) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Mon 17th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Righto, Rusty here. Let’s have a look at what’s cookin’ for the only spot on the cards: Irmas/Leftpoint.
Honestly, mate, it’s a bit of a tough stretch ahead. The forecast is showing a solid 16-day run, but the first week and a half are looking pretty average. You’ve got persistent cross to cross-onshore winds from the ENE at 18 to 19 mph, which is keepin’ the surface all lumpy and choppy – not the clean lines we’re after. The swell is mostly short-period windswell around 6 to 8 seconds, so not a lot of grunt or shape. The combined energy readings hover between 104 and 678, which is weak to moderate energy, and the scores reflect that – just poor surf conditions through the end of August. There’s a gap of solid poor surf until we get a sniff of something better.
The real standout, the only one worth gettin’ excited about, shows up right at the end of the forecast. We’re talkin’ about Friday the 28th of August through Saturday the 29th of August. That’s when a proper groundswell pushes in from the ENE with a period bumpin’ up to 11 seconds. Swell size climbs to around 12 ft, so this is expert territory only – too big for beginners by a long shot. The combined energy rockets up to between 2687 and 3069, which is strong, and while the wind is still cross-shore from the ENE at 15-19 mph, it’s a moderate breeze, better than the fresh stuff we saw earlier. Be aware, this is a long-period groundswell and it’s coming from the ENE, which is not the optimum ESE direction for this reef break – it might not line up perfectly, so don’t expect perfection. But for size and power, it’s the best on offer.
The rest of the period after that drops back off quick. By Sunday the 30th of August, the swell collapses to 2 ft from the SSW with a long 16-second period, but the wind’s back up to a fresh 22 mph cross-shore, so it’s unsurfable. Monday the 31st and Tuesday the 1st of September bring some size back, but with a rating of 1 out of 10 and poor to marginal conditions, it’s not worth gettin’ the boards out.
So, to sum it up: a long stretch of crud, then a brief window of big, raw power for the experienced crew on the 28th-29th, but even then, it’s a gamble with the wind direction. Keep an eye on that Friday swell – it’s the only real chance for a session.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun night. Warm (max 27°C on Sun night, min 24°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat afternoon, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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 8 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | NE 7 | ENE 7 | ENE 7 | SSW 16 | ENE 6 | ENE 6 | E 7 |
Wave Graph | |||||||||||||||||||
452 | 338 | 261 | 203 | 175 | 171 | 178 | 109 | 100 | 82 | 207 | 202 | 104 | 108 | 83 | 322 | 107 | 170 | 233 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross |
High Tide | 6:52AM0.50m | 5:48PM0.38m | 7:56AM0.52m | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | ||||||||
Low Tide | 00:11AM0.05m | 1:08PM0.25m | 00:39AM0.07m | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | ||||||||
— | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | |
7:00 | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | |
mm | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 28 | 25 | 24 | 24 | 23 | 23 | 24 | 25 | 25 | 25 | 26 | 25 | 26 | 27 | 28 | 27 | 28 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | S 14 | S 14 | S 13 | ENE 7 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | ENE 7 | SSW 16 | SW 16 | ENE 6 | SSW 16 |
452 | 338 | 257 | 170 | 175 | 119 | 117 | 109 | 84 | 82 | 74 | 54 | 104 | 108 | 83 | 322 | 261 | 170 | 215 | |
Swell 2 Height (m) Direction Period (s) | S 7 | S 6 | SSE 5 | E 9 | S 13 | SSW 18 | SW 18 | NE 7 | S 12 | NE 6 | NE 6 | NE 6 | SW 16 | SW 17 | SW 16 | NE 7 | E 8 | SW 16 | SSE 12 |
89 | 22 | 5 | 15 | 121 | 121 | 79 | 44 | 45 | 40 | 42 | 33 | 278 | 295 | 264 | 52 | 31 | 255 | 50 | |
Swell 3 Height (m) Direction Period (s) | S 14 | SW 18 | SW 5 | SW 6 | SW 17 | W 13 | NNE 7 | SW 16 | SSW 16 | SW 16 | SSW 18 | SSW 17 | E 8 | SSE 14 | S 11 | S 13 | S 13 | S 12 | SSE 15 |
250 | 50 | 4 | 10 | 74 | 31 | 5 | 129 | 100 | 129 | 207 | 202 | 19 | 41 | 21 | 54 | 51 | 47 | 21 | |
Wind waves Height (m) Direction Period (s) | — | ENE 8 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 8 | — | NE 6 | — | — | — | — | — | — | E 6 | ENE 6 | — | E 7 |
— | 318 | 261 | 203 | 100 | 171 | 178 | — | 39 | — | — | — | — | — | — | 49 | 107 | — | 233 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 56 | 49 | 49 | 18 | 49 | 18 | 18 | 41 | 18 | 18 | 18 | 17 | 6 | 15 | 17 | 18 | 17 | 18 | 18 |
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.











