Surf Forecasts:
Off the Wall/Insanities surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 2PM (local time) - 1ft (0.3m), 17s period, SW swell with offshore winds.
- Most powerful swell: Friday 21 Aug, 8AM (local time) - 1.5ft (0.5m), 17s period, SW swell with 135 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2PM (local time) - 1ft (0.3m), 17s period with SW swell.
Best Forecast Surf Conditions for Off the Wall/Insanities this week:
The surf forecast for Off the Wall/Insanities over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 2PM. The primary swell is predicted to be 0.3m and 17s period with a secondary swell of 0.3m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Off the Wall/Insanities in the next 16 days are 0.5m 17s and forecast to arrive on Friday (Aug 21) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 8s period and expected on Sunday (Aug 16) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Tue 18th Aug) | 1ft (0.3m) 17s |
| Best Surf | 2PM (Tue 18th Aug) | 1ft (0.3m) 17s |
| Most Powerful | 8AM (Fri 21st Aug) | 1.5ft (0.5m) 17s |
Table - best surf conditions forecast for Off the Wall/Insanities over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s dig into what’s cookin’ for this stretch.
I’ll be honest: it’s a drought right out the gate. The first wave you can even think about riding doesn’t roll in until Wednesday the 19th. Before that, it’s flat as a lake with cross-offshore winds making it a total no-go.
Wednesday 19 August – Off the Wall/Insanities (Morning)
A tiny pulse finally shows. We’re looking at a 2ft NE swell with a short 7-second period. The combined energy is 113 (moderate) – not much, but it’s something. Winds are clean offshore from the East at 9 mph, so the surface will be glassy. It’s only surfable, not good, but at least it’s not a total washout. Water temp is about 80°, which is normal for this time of year.
Thursday 20 through Friday 21 August
Slight improvement. Thursday and Friday bring 2 to 3ft from the NNE and NE, still short period (6-7 seconds). Combined energy is weak, between 34 and 61. Offshore winds stay light, so the surface stays clean, but the waves are weak and small. It’s just barely enough to get wet.
Then we hit another dead zone. From Saturday 22 through most of the following week, we’re back to tiny 0.7ft to 1ft bumps with moderate to fresh offshore winds. Not worth the walk.
Friday 28 August – Off the Wall/Insanities
This is the best day of the whole outlook. A 5ft NE swell shows up with a period of just 7 seconds – short for the size. The combined energy hits 187 (moderate), the highest we’ve seen. Winds are clean offshore from the East at 12 mph. That gives you clean, punchy waves, but the short period will make them a bit crumbly. At 5ft it’s into beginner territory – not huge but you’ll feel it. This is your best window, no question.
Sunday 30 August to Monday 31 August
Sunday afternoon jumps to 5ft from the NE with combined energy of 416 (strong) – that’s serious power. But the wind is cross-offshore, so it’ll be lumpy. Monday the 31st has even more energy (403 and 423 – strong) from the west with a very long 17-second period, but only 2ft of swell and cross-offshore winds. That long-period west groundswell has the juice, but the surface won’t cooperate.
Best bet overall: Friday 28 August. The 5ft NE swell with clean offshore wind is the real highlight. It’s not perfect, but in a run this quiet, it’s the one to mark on the calendar.
Hang tight – forecasts shift, and this dry spell won’t last.
– Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Sun afternoon. Warm (max 27°C on Sun afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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) | WNW 12 | WNW 11 | WNW 11 | SW 7 | W 11 | WNW 13 | WNW 13 | WNW 12 | NE 7 | WNW 11 | NE 6 | NNE 6 | NE 6 | W 10 | NNE 7 | NE 7 | SW 16 | WSW 10 | W 10 | SW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 28 | 25 | 25 | 12 | 10 | 17 | 34 | 28 | 44 | 25 | 45 | 34 | 51 | 8 | 61 | 54 | 124 | 10 | 8 | 22 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | off | off | off | off | off | off | off | cross-off | off | off | off | off | off | off | off |
High Tide | 4:23PM0.57m | 6:14AM0.52m | 4:19PM0.52m | 7:40AM0.53m | 3:28PM0.49m | 10:00AM0.55m | 11:33AM0.60m | 12:16PM0.64m | 12:49PM0.67m | |||||||||||
Low Tide | 11:17PM0.17m | 11:16AM0.40m | 11:40PM0.17m | 12:35PM0.47m | 00:09AM0.17m | 00:51AM0.18m | 2:10AM0.18m | 3:50AM0.17m | 5:00AM0.14m | |||||||||||
 |  |  | |  |  | | | | | | | |  | | | | | | | |
 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — |
mm | 4 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 25 | 26 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 28 | 26 |
Feels °C | 28 | 28 | 26 | 26 | 24 | 26 | 26 | 25 | 27 | 27 | 26 | 27 | 27 | 27 | 29 | 29 | 29 | 28 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | WNW 12 | SW 6 | SW 7 | SW 7 | WSW 7 | NE 8 | WNW 13 | WNW 12 | NE 7 | WNW 11 | E 8 | E 8 | NE 6 | ENE 7 | NNE 7 | NE 7 | NE 7 | ESE 9 | SSW 16 | SW 15 |
| kJ | 28 | 9 | 11 | 12 | 9 | 10 | 34 | 28 | 44 | 25 | 82 | 76 | 51 | 146 | 61 | 54 | 57 | 27 | 95 | 60 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | WNW 11 | WNW 11 | S 14 | S 14 | WNW 13 | NE 8 | NNE 7 | WNW 12 | SSW 16 | NE 6 | NNE 6 | E 8 | SW 16 | E 8 | ENE 7 | SW 16 | SSW 16 | WSW 9 | SW 9 |
| kJ | 6 | 25 | 25 | 16 | 15 | 17 | 10 | 10 | 28 | 25 | 45 | 34 | 55 | 68 | 55 | 43 | 124 | 98 | 8 | 22 |
Swell 3 Height (m) Direction Period (s) | S 13 | SSE 8 | S 14 | W 11 | W 11 | SSW 17 | SSW 18 | ENE 8 | SW 16 | SSW 19 | SW 16 | SW 18 | SW 17 | W 10 | SSW 16 | SW 16 | ESE 8 | WSW 10 | W 10 | W 10 |
| kJ | 13 | 6 | 16 | 9 | 10 | 28 | 30 | 6 | 41 | 35 | 67 | 79 | 76 | 8 | 107 | 64 | 14 | 10 | 8 | 8 |
Wind waves Height (m) Direction Period (s) | E 9 | E 8 | E 8 | E 7 | ENE 7 | E 7 | E 7 | E 7 | E 8 | ENE 8 | — | — | — | — | — | E 3 | E 4 | ENE 7 | E 7 | E 7 |
| kJ | 1283 | 634 | 367 | 285 | 215 | 148 | 126 | 126 | 140 | 149 | — | — | — | — | — | 1 | 16 | 114 | 206 | 286 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 7 | 8 | 24 | 24 | 24 | 22 | 22 | 22 | 0 | 22 | 22 | 3 | 0 | 2 | 0 | 0 | 0 | 3 | 22 | 22 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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Information about the Off the Wall/Insanities Surf forecast
The above surf forecast table for Off the Wall/Insanities provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Off the Wall/Insanities can be found by selecting the local surf guide option on the grey menu. Our Off the Wall/Insanities 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 (Off the Wall/Insanities) 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 Off the Wall/Insanities 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.
Off the Wall/Insanities is 17 km (11 miles) from Wahiawa. If you plan a vacation in Oahu, look for hotels and other accommodation in Wahiawa. Wahiawa has rooms for a wide range of budgets as well as car hire and transport links.
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