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, Rusty here. Let’s break down what we’ve got for this stretch. It’s a pretty bleak run, I gotta be honest with ya. The only spot on the cards is Irmas/Leftpoint, a fairly consistent reef break that’s exposed to the swell. But for the vast majority of this 16-day forecast, conditions are just not cooperating. The water temp is sitting at 81°, which is spot on average for this time of year, nothing unusual there.
The first real glimmer of anything decent doesn’t show up until way down the line. From Wednesday 9 September right through to the morning of Thursday 24 September, it’s pretty much all poor surf conditions. There’s a long, flat stretch there with nothing to get excited about – the wind is almost always a moderate to fresh cross or cross-onshore breeze, creating chop and lumpy conditions. Swell energy stays mostly in the moderate range, but the wind just ruins it.
We do get a spike in energy on Wednesday 16 September afternoon, and again on Friday 18 September morning and afternoon, but that’s accompanied by strong cross-winds and messy conditions. On Saturday 19 September morning, swell bumps up to 7ft from the east with a short period of 7 seconds, and the energy jumps, but the wind is a fresh cross-shore with lumpy cross-chop – that’s not paddle surfing, that’s kite surfing territory right there.
The only real standout? It comes on Thursday 24 September morning. That’s the one. After all that mess, we get a glassy morning with a slight air from the southeast at just 3 mph. The swell is a clean 2ft from the SSW, with a very long period of 16 seconds – that’s proper groundswell energy. The combined energy is solid and moderate. This is a reef break, so that long-period groundswell will wrap in nicely and give you some good shaped waves. It’s a rare moment of quality, and the crowds here can be around sometimes, so you might not have it all to yourself. This is the best on offer, no question. That afternoon sees the wind swing to a light cross-shore, and conditions become marginal again.
The morning of Thursday 24 September is your window. Don’t sleep on it.
- Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Wed night. Warm (max 27°C on Wed afternoon, min 24°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 25°C on Sat afternoon). Wind will be generally light. | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | SSW 13 | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 8 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 7 | NE 7 | SSW 19 |
Wave Graph  | ||||||||||||||||||||
 kJ | 257 | 208 | 261 | 232 | 181 | 387 | 209 | 218 | 160 | 125 | 132 | 107 | 107 | 115 | 222 | 187 | 135 | 91 | 89 | 470 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 2:07PM0.69m | 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 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 |
Temp °C | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 26 | 26 | 27 | 27 |
Feels °C | 29 | 29 | 26 | 24 | 24 | 23 | 24 | 25 | 25 | 24 | 24 | 25 | 25 | 24 | 24 | 26 | 27 | 27 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | E 13 | ENE 7 | ENE 7 | E 11 | SW 16 | SW 15 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | SSW 14 | SW 22 | SW 21 | SW 20 | NE 7 | SSW 19 |
| kJ | 140 | 202 | 261 | 232 | 123 | 261 | 229 | 218 | 160 | 112 | 132 | 107 | 107 | 115 | 77 | 227 | 224 | 392 | 89 | 470 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | E 12 | E 12 | SW 16 | NNE 8 | SSW 11 | NNE 8 | NNE 8 | ENE 10 | ENE 9 | SW 15 | SSW 15 | SW 12 | SSW 24 | SW 14 | SW 13 | E 8 | E 8 | E 11 |
| kJ | 257 | 195 | 141 | 101 | 268 | 44 | 43 | 51 | 92 | 125 | 84 | 107 | 84 | 38 | 54 | 49 | 44 | 42 | 57 | 39 |
Swell 3 Height (m) Direction Period (s) | E 13 | NW 9 | SSW 13 | SSW 13 | S 12 | SSW 11 | SW 9 | SW 15 | SW 15 | SW 16 | SSW 13 | SSW 12 | SW 12 | SW 15 | WSW 9 | WSW 9 | SSE 8 | SW 13 | SW 20 | SW 12 |
| kJ | 215 | 46 | 133 | 129 | 71 | 43 | 28 | 226 | 242 | 124 | 68 | 57 | 37 | 54 | 7 | 7 | 13 | 41 | 388 | 37 |
Wind waves Height (m) Direction Period (s) | — | ENE 7 | — | ENE 7 | ENE 7 | ENE 11 | ENE 8 | — | — | — | — | ENE 9 | ENE 9 | ENE 5 | NE 8 | NE 8 | NE 8 | NE 7 | — | ENE 8 |
| kJ | — | 208 | — | 151 | 181 | 387 | 209 | — | — | — | — | 82 | 84 | 49 | 222 | 187 | 135 | 91 | — | 220 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 15 | 15 | 49 | 49 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 18 | 18 | 35 | 18 | 6 | 15 | 25 | 18 | 6 |
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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