Surf Forecasts:
Irmas/Leftpoint surf forecast from 10 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 3ft (0.9m), 18s period, SSW swell with 541 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 0.9m 18s and forecast to arrive on Wednesday (Sep 16) at 2PM. 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 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 | 2PM (Wed 16th Sep) | 3ft (0.9m) 18s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
Alright, let’s look at this in feet and miles per hour.
Rusty here.
For Irmas/Leftpoint, we’ve got a gloomy picture. This reef break is fairly consistent and faces east-southeast, but the wind is almost always blowing from the ENE as a cross or cross-onshore, often cranking up to a fresh or strong breeze. That’s going to keep the surface lumpy and choppy for nearly the whole 16 days. The water is about normal for this time of year, so no weird temps to talk about.
Starting Thursday 10th and Friday 11th, we’re looking at waist-high to head-high swell (5ft to 5ft) but with a short period (7 to 11 seconds) and cross-to-cross-onshore wind at 12 to 22 mph. The combined swell energy is moderate (450 to 723), but it’s all chopped up. Not good.
From Saturday 12th through Monday 14th, it drops to knee-to-waist-high (3ft to 4ft) with short periods (8 to 9 seconds) and moderate cross-shore wind. Still messy.
Tuesday 15th and Wednesday 16th are the weakest, with only 3ft to 3ft of short-period swell and cross-onshore breeze. On the 16th afternoon, there’s a long-period (18-second) SSW groundswell with strong energy (807), but the cross-onshore wind and mess will make it tricky for this reef.
First day of the second week, Thursday 17th, the wind picks up to a strong breeze (22 to 25 mph) with cross-shore conditions and swell around 5ft to 5ft, but the period is short (9 seconds) and it’s lumpy. That continues through the 20th and 21st, with strong winds and messy cross-chop. The 18th and 19th see another long-period SSW groundswell (16 to 17 seconds) with strong energy (over 1000), but the wind is a strong cross or cross-onshore at 25 mph. It’s going to be blown-out and rough.
Your best bet, if you can call it that, is Monday 21st and Tuesday 22nd September. The wind drops to a light breeze (6 mph) from the east, still cross-on, and the swell is around 4ft to 4ft with a short 8-second period. It’ll be smaller, less powerful, but at least not a total wind fight. The energy is moderate (327 to 400). It’s not a standout, just the least bad day.
Honestly, there’s no real standout session across the whole 16 days. The wind ruins almost everything. Crowds are possible at Irmas/Leftpoint, but with conditions this poor, you might just find yourself completely alone – and for good reason.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Wed night. Warm (max 27°C on Wed night, min 24°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | E 11 | ENE 10 | ENE 10 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | SSW 19 |
Wave Graph  | |||||||||||||||||||
 kJ | 202 | 261 | 218 | 173 | 439 | 281 | 222 | 160 | 138 | 135 | 110 | 112 | 115 | 82 | 171 | 151 | 94 | 67 | 470 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross |
High Tide | 2:29AM0.44m | 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 | |||||||
Low Tide | 9:01PM0.04m | 8:25AM0.05m | 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 | ||||||
 |  | |  |  | |  | | | | | | | | | | | |  | |
 | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:38 | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — |
mm | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 27 |
Feels °C | 29 | 26 | 25 | 23 | 23 | 24 | 24 | 24 | 24 | 25 | 24 | 23 | 23 | 25 | 26 | 27 | 28 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | E 13 | ENE 7 | ENE 7 | E 11 | SW 16 | E 11 | ENE 10 | ENE 10 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | SW 22 | NE 8 | NE 8 | SW 20 | SSW 19 |
| kJ | 202 | 261 | 218 | 123 | 261 | 281 | 222 | 160 | 138 | 135 | 110 | 112 | 115 | 82 | 229 | 151 | 94 | 388 | 470 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | E 12 | E 12 | SW 16 | NNE 8 | SW 15 | SW 15 | NNE 9 | ENE 10 | ENE 9 | E 9 | SSW 15 | SW 12 | SW 14 | SW 14 | SW 21 | SW 20 | E 7 | E 8 |
| kJ | 195 | 141 | 101 | 268 | 35 | 229 | 226 | 96 | 125 | 84 | 78 | 84 | 38 | 50 | 49 | 224 | 392 | 39 | 41 |
Swell 3 Height (m) Direction Period (s) | NW 9 | SSW 13 | SSW 13 | S 12 | SSW 11 | SSW 11 | SSW 11 | SW 15 | SW 16 | SSW 13 | SW 15 | SW 12 | SW 15 | SSW 24 | WSW 9 | SW 13 | E 8 | SW 12 | E 11 |
| kJ | 46 | 133 | 131 | 69 | 43 | 43 | 25 | 242 | 124 | 68 | 107 | 23 | 54 | 54 | 7 | 44 | 33 | 38 | 37 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | — | ENE 7 | ENE 11 | NNE 8 | NNE 8 | — | ENE 4 | E 4 | — | ENE 9 | ENE 6 | ENE 5 | NE 8 | — | — | NE 8 | NE 7 |
| kJ | 181 | 188 | — | 173 | 439 | 72 | 76 | — | 11 | 10 | — | 58 | 71 | 42 | 171 | — | — | 67 | 79 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 49 | 49 | 18 | 20 | 18 | 18 | 18 | 18 | 18 | 18 | 20 | 31 | 18 | 6 | 15 | 15 | 15 | 17 |
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.
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