Surf Forecasts:
In Betweens surf forecast from 16 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 6ft (1.8m), 8s period, ENE swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 5AM (local time) - 16ft (5.0m), 10s period, E swell with 4,445 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 2AM (local time) - 6ft (1.8m), 8s period with ENE 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 Monday (Aug 17) at 2AM. The primary swell is predicted to be 1.8m and 8s period with a secondary swell of 0.9m and 7s. 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 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 5AM. 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 Saturday (Aug 22) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Best Surf | 2AM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Most Powerful | 5AM (Sun 16th Aug) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for In Betweens over the next 16 days.
The Lowdown
Alright, Rusty here, let’s take a good look at what’s coming up for In Betweens.
This is going to be a pretty grim run for a while. Expect a long dry spell with nothing really surfable for over a week due to strong onshore winds from the ESE and ENE that’ll mess up what little swell there is. The water temp here is sitting at 81° - about average for this time of year, so at least you won’t be freezing while you’re sitting there frustrated.
The first few days – Sunday the 16th through Wednesday the 19th – are a write-off. You’ve got stormy weather on Sunday with ESE winds howling at 25 mph, creating a really messy, cross-onshore chop. The combined energy of the swells is very strong (2287), but it’s just raw, ugly power. Not worth paddling out. Monday and Tuesday stay clean-looking but the winds are still strong from the ENE, and the swell energy drops (579 down to 346), but the swell’s too short-period and weak to form anything decent. Wednesday is the same story – small (4 ft), weak (342), and not breaking cleanly.
Thursday the 20th morning is the first faint glimmer. The swell from the SSW at 2 ft has a long period of 18 seconds – a proper groundswell – and the winds ease to a gentle breeze (9 mph) with offshore conditions. Combined energy is low (264), but for a reef setup like In Betweens, those long lines could wrap in and offer a few rideable waves. This is the best on offer in the first half of the forecast, but barely a standout. It’s more of a “if you’re desperate” situation. Crowds are likely here, and the break is fairly consistent, so don’t expect total solitude.
From the 21st through the 23rd, it’s back to marginal or poor surf. Light cross-shore winds on Friday bring tiny, weak swells (2 ft). The energy stays low (396 to 276). By the 22nd and 23rd, the ENE winds pick back up to a fresh breeze (19-22 mph), and the surf quality tanks again.
Now, something interesting happens in the second week. Starting the 24th, the swell slowly builds, and by the 27th of August and beyond, we start seeing some solid numbers. But and it’s a big but – the wind stays relentless from the ENE at 22 to 25 mph, which is cross-offshore, keeping the waves clean but also pushing hard. The swell height climbs from 6 ft up to 10 ft by the 29th, with strong wave energy (up to 1548). But the period is short (7-8 seconds), meaning it will be bouncy, fat, and a real battle for beginners. With 8 ft to 10 ft swells, this is strictly for experts.
The absolute best bet in this whole outlook falls on Saturday the 29th and Sunday the 30th. You’ve got a solid 10 ft swell from the ENE, with the combined energy cranking (1342 to 1548), and moderate to fresh breezes still from the ENE keeping the surface clean. At In Betweens, this swell direction isn’t optimum (it wants a SSE swell), but on a reef setup with that much energy, there will be some thick, powerful barrels. It’s not for the faint of heart – this is proper, heavy surf for experienced surfers only. Crowds are possible here, and with this much size, it’s likely to draw a crew of chargers.
For the last day of the month, Monday the 31st, the swell drops back to 4 ft but the period lengthens to 13 seconds. ENE winds ease to 12-16 mph, and while it’s still not perfect, this might offer a last few clean, manageable waves before the pattern changes.
Bottom line: this is a long, quiet start. Don’t even bother until Thursday the 20th for tiny, clean waves. If you’re an expert, pencil in the 29th and 30th – that is your window.
Rusty.
Short Range ForecastHeavy rain (total 47mm), heaviest during Sun morning. Warm (max 26°C on Sun morning, min 25°C on Sun morning). Winds decreasing (strong winds from the ESE on Sun morning, light winds from the E by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 9 | ENE 9 | ENE 8 | ENE 8 | S 14 | ENE 7 | S 13 | ENE 7 | ENE 9 | E 8 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 |
Wave Graph | |||||||||||||||||||||
1424 | 754 | 394 | 276 | 260 | 170 | 165 | 137 | 193 | 169 | 100 | 129 | 207 | 200 | 274 | 291 | 264 | 322 | 261 | 251 | 212 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore 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 | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:24PM0.45m | 7:54AM0.49m | 6:52PM0.37m | 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 | |||||||||
Low Tide | 12:43PM0.20m | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | ||||||||||
6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | |
mm | 34 | 7 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 25 | 25 | 27 | 25 | 25 | 24 | 24 | 24 | 25 | 24 | 26 | 26 | 27 | 27 | 28 | 29 | 29 | 28 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | ENE 9 | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | S 13 | S 13 | SW 16 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | NE 7 | SSW 16 | ENE 6 | E 8 | SSW 16 |
592 | 754 | 394 | 264 | 260 | 163 | 132 | 119 | 80 | 129 | 84 | 63 | 57 | 54 | 55 | 84 | 57 | 322 | 66 | 61 | 212 | |
Swell 2 Height (m) Direction Period (s) | S 16 | SSE 8 | SSE 7 | SSE 6 | SW 6 | S 13 | S 13 | SW 18 | SSE 7 | S 12 | S 12 | NE 6 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | NE 7 | SW 16 | SW 16 | SSE 12 |
190 | 229 | 68 | 21 | 18 | 170 | 165 | 80 | 9 | 44 | 45 | 40 | 207 | 200 | 274 | 291 | 264 | 55 | 261 | 251 | 50 | |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | S 14 | SW 6 | SSE 6 | SW 6 | SW 17 | WSW 7 | SW 18 | NNE 6 | SSW 16 | SW 16 | NE 6 | NNE 6 | E 8 | S 11 | E 8 | S 13 | S 12 | S 12 | WNW 10 |
81 | 166 | 250 | 18 | 10 | 5 | 74 | 10 | 79 | 8 | 100 | 129 | 32 | 27 | 28 | 21 | 12 | 54 | 47 | 76 | 33 | |
Wind waves Height (m) Direction Period (s) | ENE 9 | SSE 8 | — | ENE 8 | ENE 7 | — | — | ENE 7 | ENE 9 | E 8 | NNE 6 | — | — | — | — | — | — | — | — | NE 7 | E 7 |
1424 | 356 | — | 276 | 231 | — | — | 137 | 193 | 169 | 27 | — | — | — | — | — | — | — | — | 44 | 212 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 156 | 45 | 0 | 30 | 30 | 2 | 30 | 1 | 1 | 30 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 30 | 30 | 1 |
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.











