Surf Forecasts:
In Betweens surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 2AM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 11PM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,072 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 1.5ft (0.5m), 16s period with SW swell.
Best Forecast Surf Conditions for In Betweens this week:
The surf forecast for In Betweens over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 2AM. The primary swell is predicted to be 0.5m and 16s period with a secondary swell of 0.8m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at In Betweens in the next 16 days are 3.0m 8s and forecast to arrive on Monday (Aug 24) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Thursday (Aug 20) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 20th Aug) | 1.5ft (0.5m) 16s |
| Best Surf | 2AM (Thu 20th Aug) | 1.5ft (0.5m) 16s |
| Most Powerful | 11PM (Mon 24th Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for In Betweens over the next 16 days.
The Lowdown
Alright, let’s get into it. Rusty here.
We’re looking at a tough start for In Betweens, a reef break that’s usually pretty consistent but right now it’s a waiting game. The first few days are a write-off. The swell’s small, the wind’s howling cross-off, and the energy’s just not there. Tuesday the 18th sees a 2ft S swell with a 13-second period, but with 16 mph cross-off winds, the surface is clean but the surf is poor. The wave energy is moderate at 480. Water temp is 81°, which is about average for this time of year. Wednesday and Thursday mornings stay small, with Thursday the 20th offering the first real glimpse of hope: a 2ft SSW groundswell with a long 18-second period and light 6 mph cross-off winds. This is a clean, glassy morning with moderate energy (279). The long period means the reef will shape the waves nicely, but the size is tiny—better for a longboard than a serious session. Friday the 21st goes a bit lumpy with cross-on winds.
Then it gets ugly. From Saturday the 22nd through to the end of August, the wind cranks up—fresh to strong breeze from the ENE, blowing 19 to 28 mph, and while it stays cross-off, the swell jumps up. By Sunday the 23rd, we’ve got a 7ft ENE windswell with a short 7-second period and energy at 776. This is all chop and closeouts, nothing you’d want to paddle into. It stays like that for days—big, messy, and blown out. The energy peaks at 884 on Monday the 24th, then hits 1077 on Tuesday the 25th—strong energy, but with a short period and those winds, it’s a kite-surfing setup, not a paddle-surfing one.
We finally see a shift around Thursday the 27th of August. The swell drops a bit to 5ft but the period is still short and the wind is still a fresh breeze. Not good. Then on the 30th of August, a Sunday, we get an 12ft E swell with a 9-second period and a massive energy reading of 1819. That’s very strong wave energy. This is big—only for experts. The wind is still cross-off at 22 mph, so it’ll be clean but heavy. Monday the 31st stays big at 10ft.
The true standout? It comes on Tuesday, 1st September. The swell drops to a more manageable 8ft from the east, period still short at 8 seconds, but the wind swings to a gentle 9 mph cross-off. The energy is huge at 2044 in the morning, and by the afternoon the wind goes gentle cross-off with 7ft east swell and energy at 1168. This is described as excellent for experienced surfers. It’s the best window in the whole outlook. The wave energy is very strong, but with those lighter winds, the reef should hold.
The next day, Wednesday the 2nd of September, is also a gem for the experienced crew. A 6ft SSW groundswell with an 11-second period, but the wind goes glassy in the afternoon—a 3 mph south wind, dead calm. That’s a rare treat. Energy is 1263. If you can handle the size, the conditions will be pristine.
Overall, the first week is a bust. The second week has some huge, windy swell for experts only, and the very best conditions are on September 1st and 2nd. Crowds at In Betweens can be an issue sometimes, so keep that in mind if you’re heading out for that September window. If you’re a beginner, steer clear until after the 2nd.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (light winds from the E on Fri morning, strong winds from the ENE by Sun morning). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
AM | 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 | S 13 | E 9 | SW 16 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
Wave Graph | |||||||||||||||||||||
165 | 140 | 117 | 129 | 100 | 129 | 207 | 200 | 274 | 291 | 261 | 322 | 261 | 255 | 335 | 485 | 381 | 529 | 512 | 654 | 1001 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:59AM0.51m | 7:16PM0.30m | 10:13AM0.53m | 11:25AM0.56m | 10:11PM0.21m | 12:25PM0.59m | 00:08AM0.21m | 1:12PM0.63m | 1:06AM0.23m | 1:52PM0.66m | 1:46AM0.26m | 2:26PM0.67m | 2:21AM0.29m | ||||||||
Low Tide | 3:56PM0.27m | 2:01AM0.10m | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | 6:08AM0.10m | 9:18PM0.14m | 6:59AM0.08m | 9:35PM0.13m | ||||||||||
6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 24 | 25 | 25 | 26 | 26 | 28 | 30 | 30 | 29 | 30 | 29 | 25 | 24 | 25 | 23 | 23 | 23 | 22 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | ENE 7 | E 9 | E 8 | E 8 | E 8 | E 8 | E 7 | NE 7 | SW 17 | ENE 7 | SSW 16 | SW 16 | SW 16 | SSW 16 | SSE 13 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSE 11 |
158 | 140 | 117 | 86 | 84 | 82 | 72 | 70 | 82 | 291 | 63 | 322 | 261 | 255 | 212 | 99 | 144 | 186 | 108 | 118 | 133 | |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | S 13 | SW 16 | S 12 | SW 16 | SSW 18 | NNE 6 | SW 16 | NNE 7 | SW 16 | WNW 10 | WNW 10 | W 10 | S 14 | SW 15 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSW 13 |
165 | 119 | 116 | 129 | 45 | 129 | 207 | 27 | 274 | 29 | 261 | 33 | 34 | 54 | 104 | 116 | 67 | 57 | 59 | 81 | 64 | |
Swell 3 Height (m) Direction Period (s) | SW 17 | SW 18 | SW 18 | S 12 | SSW 16 | S 12 | NNE 6 | SSW 17 | E 8 | E 7 | NNE 7 | S 13 | S 12 | S 12 | NW 12 | SSW 15 | WNW 10 | SE 12 | SE 10 | SSW 18 | SSW 17 |
74 | 80 | 79 | 44 | 100 | 45 | 27 | 200 | 31 | 35 | 18 | 54 | 47 | 47 | 34 | 76 | 10 | 39 | 27 | 31 | 56 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | NE 6 | NE 5 | NE 7 | NNE 6 | NE 6 | — | — | — | — | — | ENE 7 | ENE 7 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
83 | 31 | 23 | 36 | 26 | 32 | — | — | — | — | — | 105 | 158 | 252 | 335 | 485 | 381 | 529 | 512 | 654 | 1001 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 18 | 20 | 1 | 30 | 38 | 34 | 39 | 127 | 39 | 46 | 127 | 126 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the In Betweens Surf forecast
The above surf forecast table for In Betweens provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at In Betweens can be found by selecting the local surf guide option on the grey menu. Our In Betweens 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 (In Betweens) 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 In Betweens 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.
In Betweens is 4 km (2 miles) from Honolulu. If you plan a vacation in Oahu, look for hotels and other accommodation in Honolulu. Honolulu has rooms for a wide range of budgets as well as car hire and transport links.











