
Surf Forecasts:
Irmas/Leftpoint surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8AM (local time) - 7ft (2.1m), 8s period, ENE swell with 578 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 8s and forecast to arrive on Thursday (Sep 17) at 8AM. 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 | 8AM (Thu 17th Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break this down.
I’ll be honest, the next 16 days at Irmas/Leftpoint are looking pretty grim. We’ve got a huge gap right at the start with no decent surf on the cards. The first anything close to rideable doesn’t appear until Thursday the 22nd of September, and even that is just marginal. That’s about 12 days of nothing.
Right now, the wind is hammering out of the east-northeast at 15 to 25 mph, and it stays cross or cross-onshore almost the whole time. The surface is chopped up and messy. The swell is mostly from the east-northeast with a short period of 7 to 11 seconds, so the waves are weak and lack any real push. The combined energy is moderate, in the 100 to 700 range, but none of it matters with the wind this bad.
On Thursday the 22nd of September, we finally see some swell size, around 7 ft from the east, with a 10-second period and combined energy hitting 893 (moderate). But the wind is still cross-onshore at 12 mph, so the surface will stay lumpy. It’s a marginal call.
Friday the 23rd of September is similar: 6 ft of east swell, period up to 10 seconds, and the wind eases a bit to 12 mph but stays cross-shore. Still not clean, but it’s the best we’ll see. The water temperature is about 80°F, which is normal for this time of year with a minor anomaly, so it’s warm for just boardies.
Irmas/Leftpoint is a reef break, fairly consistent, and works best with an ESE swell. The swell we get is mostly east to east-northeast, so it’s off-angle but not terrible. It’s for intermediate surfers, so when the waves are good, it can handle a crowd. But with this wind, crowds won’t be a problem because nobody’s out there.
There’s no standout day. If I had to pick one, it’s the morning of Friday the 23rd, but it’s a long shot. The wind is never favorable, the swell never gets clean, and the period is too short to make up for it. This one’s a write-off, folks.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 24°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 | ENE 7 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 7 | NE 7 | SSW 19 | ENE 7 | SSW 18 | ENE 8 |
Wave Graph | ||||||||||||||||||||
247 | 191 | 422 | 292 | 279 | 160 | 115 | 135 | 135 | 220 | 210 | 153 | 165 | 145 | 121 | 89 | 470 | 301 | 541 | 451 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 2:41PM0.65m | 3:11AM0.50m | 3:13PM0.59m | 3:51AM0.55m | 3:42PM0.51m | 4:32AM0.57m | 4:10PM0.44m | 5:15AM0.59m | 4:37PM0.37m | 6:02AM0.58m | 5:04PM0.30m | 6:56AM0.56m | 5:30PM0.25m | |||||||
Low Tide | 9:26PM0.04m | 9:14AM0.08m | 9:49PM0.03m | 10:05AM0.12m | 10:11PM0.04m | 10:58AM0.16m | 10:34PM0.05m | 11:57AM0.20m | 10:58PM0.06m | 1:10PM0.23m | 11:24PM0.09m | 2:59PM0.23m | 11:56PM0.11m | |||||||
— | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | |
6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 24 | 23 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 27 | 25 | 26 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | E 12 | E 11 | ENE 11 | NNE 8 | SW 15 | ENE 10 | NE 9 | NNE 9 | NNE 9 | SSW 15 | SW 12 | SW 14 | SW 22 | NE 8 | NE 7 | SW 20 | SSW 19 | SW 18 | SSW 18 | SW 17 |
101 | 123 | 422 | 72 | 226 | 160 | 115 | 135 | 135 | 84 | 38 | 50 | 227 | 145 | 121 | 388 | 470 | 455 | 541 | 429 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SW 16 | SW 16 | SW 15 | NNE 8 | NNE 8 | ENE 10 | ENE 9 | SW 15 | SW 12 | SW 15 | SSW 24 | SW 14 | SW 21 | SW 20 | E 8 | E 11 | E 10 | E 10 | E 10 |
129 | 268 | 261 | 229 | 52 | 92 | 98 | 108 | 107 | 23 | 54 | 54 | 49 | 224 | 392 | 32 | 57 | 69 | 68 | 98 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SSW 12 | NNE 8 | SSW 11 | SSW 11 | SW 15 | SW 16 | SSW 13 | SSW 12 | S 10 | SSW 24 | SSW 11 | SSW 11 | SSW 13 | E 12 | E 11 | ESE 8 | SW 12 | SW 11 | SSW 11 |
155 | 77 | 42 | 43 | 25 | 242 | 124 | 68 | 57 | 8 | 54 | 12 | 12 | 68 | 46 | 64 | 19 | 35 | 19 | 12 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | — | ENE 11 | ENE 10 | — | — | ENE 4 | ENE 9 | NE 9 | NE 9 | NE 8 | NE 8 | — | — | NE 7 | NE 7 | ENE 7 | ENE 7 | ENE 8 |
247 | 191 | — | 292 | 279 | — | — | 11 | 82 | 220 | 210 | 153 | 165 | — | — | 89 | 135 | 301 | 327 | 451 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 56 | 49 | 20 | 20 | 18 | 18 | 41 | 18 | 18 | 18 | 18 | 18 | 18 | 6 | 17 | 18 | 18 | 18 | 49 | 56 |
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.










