Surf Forecasts:
Irmas/Leftpoint surf forecast from 8 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 8 Sep, 5AM (local time) - 15ft (4.5m), 12s period, SSW swell with 5,282 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period with SSW swell.
Best Forecast Surf Conditions for Irmas/Leftpoint this week:
The surf forecast for Irmas/Leftpoint over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 09) at 5AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.4m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Irmas/Leftpoint in the next 16 days are 4.5m 12s and forecast to arrive on Tuesday (Sep 08) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 15s period and expected on Monday (Sep 07) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Best Surf | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Most Powerful | 5AM (Tue 8th Sep) | 15ft (4.5m) 12s |
Table - best surf conditions forecast for Irmas/Leftpoint over the next 16 days.
The Lowdown
G’day, Rusty here. This 16-day stretch starting 7th September is a tough one, with a big ol’ gap of poor surf before anything remotely clean shows up. If you’re after waves, patience is the name of the game.
The only spot we’ve got is Irmas/Leftpoint (reef). It’s fairly consistent when conditions line up, but this period mostly serves up messy cross-shore and onshore winds. Water temp is about 81°F, right on average for September—no surprises there.
We start Monday afternoon, 7th September, with a risk of thunderstorms, a stiff 22 mph ESE wind, and 6ft of 12-second east swell. Wave energy is 1435 (moderate-strong), but it’s choppy garbage. Tuesday 8th brings 7ft of ENE swell (2427 energy, strong) but a 19 mph SSW cross-onshore kills it. From there until the 21st, it’s mostly under 3ft, with weak energy (under 500) and short or crossed-up periods. A few glimpses of longer-period SSW groundswell (16–18 seconds) around 16th–18th September push energy back up to 400–787, but the wind stays cross-shore or light onshore, so they remain marginal.
The one bright spot is Tuesday morning, 22nd September. The wind goes glassy—calm, just 3 mph from the ENE. Swell is tiny at 2ft from the SSW, but with a long 14-second period. Wave energy is 271 (weak to moderate), but the forecast says “expect good surf conditions.” On a reef, that clean, long-period groundswell with glassy conditions is a rare score. The waves will be clean and well-shaped, and with long lulls between sets, paddling is easy. Crowds can pop up here sometimes, but a Tuesday morning with ankle-to-knee-high surf? You’ll likely have it to yourself.
That’s it—one glassy morning two weeks out. Everything before is a bust. Keep the faith, and check back in.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon afternoon. Warm (max 27°C on Mon afternoon, min 26°C on Tue night). Winds decreasing (near gales from the SSE on Mon night, calm by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu afternoon, min 25°C on Thu afternoon). Mainly fresh winds. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | SSW 14 | SSW 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 11 | ENE 10 | E 10 | ENE 10 | NNE 9 | NE 8 | ENE 9 | NE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 855 | 1420 | 973 | 745 | 419 | 269 | 257 | 265 | 286 | 223 | 173 | 401 | 292 | 302 | 196 | 169 | 94 | 72 | 84 | 75 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross |
High Tide | 1:03AM0.31m | 1:30PM0.72m | 1:48AM0.38m | 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 | ||||||||
Low Tide | 8:09PM0.07m | 6:40AM0.03m | 8:36PM0.05m | 7:34AM0.03m | 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 | |||||||
 |  | |  |  | |  |  | | | | | |  | | | | | | | |
 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — |
mm | 5 | 9 | 1 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 27 | 24 | 26 | 27 | 30 | 30 | 29 | 30 | 26 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 25 | 25 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | ENE 11 | SSW 9 | ENE 10 | ENE 9 | ENE 8 | ENE 7 | E 12 | E 12 | E 11 | ENE 11 | ENE 11 | ENE 10 | E 10 | ENE 10 | NNE 9 | NE 8 | NE 8 | NE 9 |
| kJ | 1647 | 6068 | 973 | 489 | 419 | 207 | 140 | 265 | 141 | 137 | 123 | 401 | 292 | 302 | 196 | 169 | 94 | 72 | 72 | 75 |
Swell 2 Height (m) Direction Period (s) | E 12 | ENE 12 | W 10 | ENE 11 | SSW 8 | SSW 14 | SSW 13 | E 13 | SSW 13 | SSW 13 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | NE 8 | ENE 9 | ENE 9 | SSW 15 | ENE 8 |
| kJ | 855 | 1420 | 509 | 745 | 137 | 269 | 257 | 156 | 133 | 129 | 268 | 261 | 229 | 226 | 242 | 74 | 65 | 46 | 84 | 54 |
Swell 3 Height (m) Direction Period (s) | S 8 | SSW 15 | SSW 15 | W 9 | SSW 14 | SSW 8 | E 13 | SSW 13 | SSW 16 | SW 18 | SSW 12 | SW 9 | NNE 8 | SSW 11 | NE 8 | SW 16 | SSW 13 | SW 15 | SW 12 | SW 12 |
| kJ | 177 | 581 | 505 | 157 | 356 | 72 | 215 | 195 | 179 | 155 | 77 | 30 | 32 | 24 | 69 | 124 | 68 | 107 | 37 | 38 |
Wind waves Height (m) Direction Period (s) | ENE 7 | SSE 8 | SSW 9 | — | — | — | — | WSW 5 | ENE 7 | ENE 7 | ENE 7 | — | — | — | — | — | E 5 | E 5 | ENE 9 | — |
| kJ | 403 | 936 | 949 | — | — | — | — | 4 | 286 | 223 | 173 | — | — | — | — | — | 37 | 25 | 82 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 107 | 111 | 125 | 7 | 2 | 6 | 15 | 18 | 18 | 18 | 18 | 41 | 18 | 19 | 25 | 18 | 18 | 18 | 18 | 18 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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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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