Surf Forecasts:
Irmas/Leftpoint surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 11PM (local time) - 8ft (2.5m), 8s period, ENE swell with 828 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s 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 Thursday (Aug 20) at 8PM. The primary swell is predicted to be 0.6m and 17s period with a secondary swell of 1.1m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Irmas/Leftpoint in the next 16 days are 2.5m 8s and forecast to arrive on Monday (Aug 24) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Thursday (Aug 20) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Most Powerful | 11PM (Mon 24th Aug) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright folks, let’s talk about the next couple of weeks here. It’s looking like a bit of a dry spell, I won't lie. We got Irmas/Leftpoint, and the water’s sitting at a warm 80°, which is right about normal. So you won’t be cold, but you might be disappointed.
The whole stretch is mangled by onshore and cross-shore winds, mostly out of the ENE. It's going to be lumpy, cross-chop, and just plain messy. There’s plenty of swell rolling through, but it’s all short-period and the wind is gonna destroy it. Starting Tuesday the 18th, we got 5ft of short-period ENE swell with a fresh breeze. That's a no-go.
We’ve got a long stretch of nothing from the 18th all the way through the 25th. The swell is there, but the wind is a constant killer. It’s all cross-shore, blowing 15-25 mph, just chopping everything up. On the 20th, there’s a brief minute Thursday afternoon where the wind drops and goes cross-offshore, cleaning it up, but the swell drops to a pathetic 2ft. Not worth the paddle.
The energy starts building around the 23rd and 24th, with combined swell energy jumping into the 700s and 800s, but it’s all short-period, wind-driven junk. By the 30th, we’re looking at 10ft of swell with a combined energy over 2000, but it’s coming with a cross-on wind and a side-chop. There’s a slight chance Sunday afternoon that it gets a little less terrible, but it’s still a hard pass.
The only real glimmer is on Monday the 31st. The swell direction swings around to the south with a 12-second period, which is better, and the energy is strong at 2204, but the wind is still blowing 19 mph from the ENE, making it messy. It’s a marginal call at best.
Honestly, for the next two weeks, I wouldn’t get my hopes up. The winds are just not our friend. If you’re desperate, the 31st might offer something, but the quality is going to be poor. It’s a tough stretch for the reef, and the conditions are better suited for a kite than a paddle board. Keep an eye on it, but don’t cancel your plans.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue morning, light winds from the NNE by Thu night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (calm on Fri morning, strong winds from the ENE by Sun morning). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 | E 8 | ENE 8 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | ENE 7 | ENE 7 | ENE 7 | SSW 16 | ENE 6 | ENE 6 | E 7 | E 7 | E 7 | ENE 7 | E 7 | ENE 7 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 188 | 122 | 186 | 109 | 107 | 102 | 207 | 202 | 38 | 86 | 132 | 322 | 149 | 260 | 428 | 602 | 480 | 461 | 480 | 500 | 735 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-off | on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | 12:51PM0.62m | 00:45AM0.24m | 1:26PM0.65m | 1:20AM0.27m | |||||||||
Low Tide | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | 5:23AM0.08m | 8:29PM0.12m | 6:13AM0.06m | 8:49PM0.11m | |||||||||
 | |  |  | | | | | | | | | | | | | |  | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 22 | 23 | 25 | 24 | 25 | 26 | 28 | 29 | 30 | 29 | 27 | 26 | 24 | 23 | 22 | 22 | 22 | 22 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | S 13 | E 8 | S 13 | E 8 | E 8 | E 8 | E 8 | ENE 7 | NNE 6 | ENE 7 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 | S 13 | SSW 15 | SSE 13 | S 12 | SSE 11 | SSW 13 |
| kJ | 121 | 122 | 117 | 109 | 107 | 102 | 93 | 164 | 35 | 86 | 264 | 322 | 261 | 255 | 215 | 90 | 144 | 102 | 112 | 130 | 129 |
Swell 2 Height (m) Direction Period (s) | SW 17 | S 13 | SW 18 | S 12 | S 12 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | W 10 | W 10 | E 8 | SSE 12 | S 14 | SW 15 | SSE 13 | SW 14 | SSW 14 | SSW 13 | S 10 |
| kJ | 74 | 119 | 79 | 69 | 71 | 129 | 207 | 202 | 278 | 295 | 33 | 30 | 33 | 50 | 104 | 116 | 69 | 100 | 104 | 102 | 47 |
Swell 3 Height (m) Direction Period (s) | WSW 6 | SSW 18 | W 12 | SW 16 | SSW 16 | S 12 | S 11 | SSE 12 | ENE 7 | NNE 7 | S 11 | S 13 | SSE 12 | WNW 10 | WNW 12 | SSW 15 | NW 11 | SE 12 | SSE 10 | NW 11 | SSW 17 |
| kJ | 3 | 121 | 11 | 129 | 100 | 45 | 39 | 28 | 38 | 41 | 21 | 54 | 50 | 21 | 46 | 78 | 31 | 67 | 42 | 19 | 95 |
Wind waves Height (m) Direction Period (s) | ENE 7 | NE 6 | ENE 8 | NE 7 | NE 6 | NE 6 | NNE 6 | — | — | — | ENE 7 | ENE 7 | ENE 6 | ENE 6 | E 7 | E 7 | E 7 | ENE 7 | E 7 | ENE 7 | ENE 8 |
| kJ | 188 | 36 | 186 | 44 | 39 | 51 | 35 | — | — | — | 132 | 137 | 149 | 260 | 428 | 602 | 480 | 461 | 480 | 500 | 735 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 18 | 18 | 18 | 18 | 17 | 25 | 6 | 4 | 6 | 6 | 41 | 49 | 56 | 56 | 58 | 60 | 49 | 56 | 56 | 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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