
Surf Forecasts:
Irmas/Leftpoint surf forecast from 15 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 5PM (local time) - 7ft (2.2m), 9s period, ENE swell with 802 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 2.2m 9s and forecast to arrive on Thursday (Sep 17) at 5PM. 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 | 5PM (Thu 17th Sep) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s on offer for this stretch.
To be straight with you, there’s nothing in the whole 16-day window that screams “grab the board and go.” The entire run from now through to the end of the month is one long quiet patch with messy, wind-affected conditions. There are no standout sessions, no windows where I’d tell you to drop everything.
Let’s run through it. From Tuesday morning, September 15th, through the 16th, we’ve got a small, short-period NE swell around 2 ft to 3 ft, but the wind is a consistent cross-shore with a moderate to fresh breeze. The water temperature feels about average for this time of year. The combined swell energy stays weak to moderate (141 to 169). Poor surf conditions are the story.
Then from the 17th of September onward, the swell bumps up — Thursday morning sees 7 ft of short-period ENE swell at 7 seconds, with a strong breeze and lumpy cross-chop. The combined energy climbs into moderate to strong territory (665 to 1022), but the quality is poor. That kind of size and onshore wind just turns it into a washing machine. By Thursday afternoon, it’s still only marginal at best.
Through the 18th to the 21st of September, the swell holds between 3 ft and 7 ft, with ENE and E directions, periods mostly short. A couple of longer-period SSW pulses roll through on the 18th (17 seconds, 3 ft), but the wind stays cross or cross-on, fresh to strong, and the break is a reef set-up. Even with that long-period groundswell, the wind and chop ruin any chance of a clean line. The energy values are strong — over 1100 at times — but with no decent wind, that energy just means a tough paddle and blown-out faces.
By the 22nd of September, it’s more of the same: 6 ft to 8 ft ENE/E, short period, strong cross-shore breeze. Poor conditions continue.
Into the final week — from the 25th of September through the 30th — the swell drops back. A few SSW pulses with 15-18 second periods appear (2 ft to 3 ft), and finally on the Tuesday afternoon (29th) and Wednesday morning (30th) we get a clean cross-offshore wind from the NNE at 12-18 mph. The sea state cleans up, but the swell is tiny — only 2 ft to 2 ft — and combined energy is moderate (382 to 434). It’s not enough to get excited about, just a marginal clean opportunity.
So bottom line: there are no good surf options in the entire 16-day window. The consistent onshore and cross-shore wind smashes every attempt at quality, and the clean spells only show up when the swell has dropped to near-flat. It’s one of those blank runs for the area. Forecasts can change, but as it stands, you’re better off keeping the board in the car and checking back later.
— Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Tue morning, min 25°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Thu night. Warm (max 27°C on Fri morning, min 25°C on Sat night). Mainly strong winds. | ||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 | NE 8 | SSW 19 | E 10 | SSW 18 | SSW 17 | ENE 7 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | ENE 8 | E 8 | E 7 | ENE 8 | ENE 7 |
Wave Graph | |||||||||||||||||||
68 | 75 | 99 | 470 | 100 | 541 | 516 | 516 | 802 | 676 | 622 | 580 | 539 | 437 | 485 | 522 | 480 | 427 | 547 | |
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-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 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 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:34 | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | — | — | — | 11 | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 27 | 26 | 26 | 25 | 25 | 25 | 26 | 24 | 26 | 25 | 24 | 24 | 25 | 26 | 24 | 24 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | NE 8 | SW 20 | SW 20 | SSW 19 | SW 18 | SSW 18 | SSW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
65 | 392 | 388 | 470 | 455 | 541 | 516 | 261 | 258 | 644 | 622 | 580 | 539 | 382 | 387 | 350 | 231 | 296 | 346 | |
Swell 2 Height (m) Direction Period (s) | SW 21 | ENE 8 | E 12 | NE 7 | E 10 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 | SSE 9 | SSE 7 | SSE 6 | SSW 18 | S 18 | SW 16 | SSW 15 | SW 15 | SW 15 |
224 | 20 | 66 | 56 | 100 | 31 | 125 | 149 | 210 | 9 | 7 | 16 | 7 | 108 | 99 | 122 | 154 | 104 | 33 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | E 12 | SW 12 | E 11 | SW 12 | WSW 8 | SSW 11 | SW 11 | SSW 10 | WSW 8 | W 9 | WSW 9 | S 20 | SSE 6 | SSE 6 | SSW 14 | SSE 8 | SSE 12 | NNW 10 |
68 | 46 | 38 | 58 | 35 | 7 | 12 | 18 | 10 | 7 | 2 | 8 | 30 | 7 | 7 | 37 | 6 | 14 | 11 | |
Wind waves Height (m) Direction Period (s) | ENE 4 | NE 8 | NE 8 | E 5 | NE 6 | ENE 10 | NE 6 | ENE 7 | ENE 9 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 7 | ENE 8 | ENE 7 |
17 | 75 | 99 | 47 | 69 | 427 | 196 | 516 | 802 | 676 | 520 | 509 | 427 | 437 | 485 | 522 | 480 | 427 | 547 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 17 | 18 | 18 | 18 | 49 | 49 | 49 | 49 | 56 | 20 | 50 | 56 | 49 | 49 | 50 | 49 | 49 | 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.










