
Surf Forecasts:
Irmas/Leftpoint surf forecast from 14 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 11AM (local time) - 7ft (2.1m), 10s period, ENE swell with 815 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 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 11AM. 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 | 11AM (Thu 17th Sep) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at the surf prospects at Irmas/Leftpoint (reef) over the next couple of weeks.
To be honest, the first week and a half looks pretty grim. We've got a long stretch of messy cross-shore and cross-onshore winds blowing in the mid to upper teens and low 20s mph, and the wave energy is mostly weak to moderate. The swell is short-period stuff, under 10 seconds, and the conditions are just lumpy and chopped up. That pattern runs from Monday, September 14 right through to about the 24th. There is a moment on Wednesday the 16th afternoon where the combined energy jumps and the swell swings to a long-period 3ft from the SSW, but it's accompanied by a fresh 22 mph cross-shore wind—still no good for surfing.
The real turnaround happens on the 25th of September. Friday afternoon we finally see some relief, with a moderate breeze going cross-offshore. That's the first sign of hope, cleaning things up and offering a 5ft swell.
Then we get to our standouts. Saturday the 26th is where it's at. Morning sees a light breeze, cross-offshore, and clean conditions. The swell is a modest 3ft out of the SSW with a very long-period of 15 seconds. That's proper groundswell energy, and it'll wrap into this reef beautifully. The Saturday afternoon session holds too, with 3ft from SSW at 14 seconds, also glassy and clean. This is the best on offer.
Sunday the 27th morning is another cracker—light N winds, cross-off, 3ft SSW groundswell with a 16-second period, and clean faces. The water temperature is sitting around 81°F, which is bang on average for this time of year, so no wetsuit needed.
Now a word on crowds: this spot can get busy sometimes, but with conditions like that on a Saturday, expect a few others to have the same idea. And remember, longer-period swells like this can run a bit straight at beach breaks, but at a reef point like this, it's going to set up some nice, well-shaped lines. The 3ft to 3ft size is perfect for all levels.
Monday the 28th afternoon also looks promising: light winds, clean, with a 3ft SSW swell and a very long 18-second period. That's powerful for its size, but still very manageable.
Into Tuesday the 29th, we see the wind shift, but with a slight air or light breeze, the morning is still clean and good, offering 4ft from the east at 10 seconds. Afternoon that day looks very good again with 4ft ENE swell and glassy conditions.
So, to sum it up: sit tight through a long, rough patch. The real action kicks off on Friday the 25th afternoon, but the absolute standouts are Saturday the 26th and Sunday the 27th. Clean, offshore conditions, long-period SSW groundswell, and that classic reef set-up. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 25°C on Mon morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Thu night. Warm (max 27°C on Fri morning, min 26°C on Thu morning). Mainly fresh winds. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 13 | ENE 6 | NE 8 | SSW 19 | E 10 | SSW 18 | SSW 17 | ENE 10 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | ENE 8 | SSW 16 | E 8 | E 7 | ENE 8 | ENE 7 |
Wave Graph | |||||||||||||||||||||
82 | 80 | 68 | 53 | 128 | 470 | 167 | 541 | 516 | 815 | 675 | 660 | 622 | 580 | 539 | 437 | 437 | 522 | 423 | 427 | 405 | |
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-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on |
High Tide | 4:37PM0.37m | 6:02AM0.58m | 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 | ||||||||
Low Tide | 11:57AM0.20m | 10:58PM0.06m | 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 | |||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 13 | — | — | 3 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 25 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 25 | 23 | 25 | 24 | 23 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 8 | SW 20 | SW 20 | SSW 19 | E 10 | SSW 18 | SSW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
82 | 80 | 51 | 392 | 388 | 470 | 167 | 541 | 516 | 261 | 258 | 644 | 622 | 580 | 539 | 245 | 387 | 269 | 231 | 292 | 273 | |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SW 22 | SW 21 | NNE 8 | E 12 | E 11 | SW 18 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 | SSE 9 | SSE 7 | SSE 9 | SSW 18 | S 18 | SW 16 | SSW 15 | SW 15 | SW 15 |
77 | 227 | 224 | 49 | 66 | 58 | 455 | 31 | 159 | 149 | 210 | 9 | 9 | 15 | 15 | 104 | 99 | 122 | 154 | 104 | 33 | |
Swell 3 Height (m) Direction Period (s) | SSW 24 | SW 14 | SSW 13 | E 12 | SW 12 | SW 12 | SW 12 | S 8 | SSW 11 | SW 11 | SW 10 | WSW 8 | W 9 | S 21 | S 20 | SSW 15 | SSE 6 | SSW 14 | SSE 7 | W 13 | W 12 |
54 | 49 | 68 | 46 | 38 | 38 | 35 | 5 | 12 | 18 | 4 | 7 | 2 | 36 | 30 | 78 | 13 | 37 | 5 | 13 | 12 | |
Wind waves Height (m) Direction Period (s) | ENE 5 | ENE 4 | ENE 5 | ENE 6 | NE 8 | ENE 5 | NE 7 | ENE 10 | ENE 6 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 7 | ENE 8 | ENE 7 |
28 | 16 | 51 | 53 | 128 | 90 | 112 | 480 | 218 | 815 | 675 | 660 | 520 | 461 | 473 | 437 | 437 | 522 | 423 | 427 | 405 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 18 | 18 | 18 | 20 | 20 | 49 | 109 | 49 | 49 | 49 | 18 | 49 | 41 | 18 | 60 | 56 | 49 | 50 | 56 | 49 |
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.










