Surf Forecasts:
In Betweens surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 5AM (local time) - 5.5ft (1.7m), 8s period, ENE swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 8PM (local time) - 6.5ft (2.0m), 8s period, ENE swell with 549 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 5AM (local time) - 5.5ft (1.7m), 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 5AM. The primary swell is predicted to be 1.7m and 8s period with a secondary swell of 0.9m and 14s. 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 2.0m 8s and forecast to arrive on Sunday (Aug 16) at 8PM. 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 7s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 17th Aug) | 5.5ft (1.7m) 8s |
| Best Surf | 5AM (Mon 17th Aug) | 5.5ft (1.7m) 8s |
| Most Powerful | 8PM (Sun 16th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for In Betweens over the next 16 days.
The Lowdown
Alright, Rusty here again, giving it to you in feet and knots. The next couple of weeks at In Betweens are a real mixed bag. For the first week or so, the surf is pretty small and confused, but we’ve got some cleaner days ahead if you’re patient. The water temp is 81°, pretty normal for this time of year.
We’ve got a slow start. Sunday the 16th is a total loss. It’s got a heavy 10-foot swell, but it’s coming from the ENE with a short 9 second period and a nasty cross-onshore wind, 25 knots. The wave energy is through the roof but it’s just a washing machine.
Monday the 17th drops right off to 3-foot of long period 14 second S swell. It’s clean with a cross-offshore wind, but just not enough size. This tiny trend runs through Tuesday and Wednesday, with super long period SSW swells and clean conditions, but it’s barely knee-high.
Thursday the 20th is your first good call. Morning brings about 2-foot of 18 second SSW groundswell, with a light ENE breeze making it glassy. It’s small but pristine. Grab a longboard or a fish for a dawn patrol.
Friday the 21st and Saturday the 22nd are similar sized but with light cross-on breezes putting a ripple on it. Sunday the 23rd we see a jump back to 5-foot, but it’s a short period ENE windswell. It’s clean but junky.
Into the second week, it ramps up. From Monday the 25th to Wednesday the 27th, the ENE swell builds from 6-foot to 8-foot. Short period, 7-8 seconds. The wind is cross-off and clean, but that short period isn’t doing us any favors on the reef.
The real standout is the 27th of August. Thursday morning brings a solid 10-foot of ENE swell, with a 10 second period and a fresh cross-off wind. This is proper size and power. Then Friday the 28th is the peak: a 12-foot E swell. At this size, over 8-foot, it’s strictly for experts only. The reef will be firing but unforgiving.
After that, it drops hard through the 29th and goes back to those small, clean SSW pulses.
Best on offer: Thursday the 20th for a small, clean morning. And for the big stuff, Thursday the 27th and Friday the 28th are the days, but you better know what you’re doing.
This is Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sun afternoon. Warm (max 27°C on Sun afternoon, min 24°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat morning, 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) | ENE 9 | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | SW 16 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 790 | 418 | 334 | 260 | 170 | 147 | 164 | 151 | 129 | 100 | 129 | 207 | 200 | 274 | 291 | 261 | 322 | 261 | 251 | 212 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | 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 | 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 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — |
mm | 8 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 28 | 28 | 25 | 24 | 25 | 24 | 25 | 24 | 24 | 26 | 25 | 26 | 26 | 28 | 29 | 28 | 29 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | ENE 8 | ENE 8 | S 14 | S 13 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | SW 16 | NE 7 | ENE 7 | SW 16 | ENE 7 |
| kJ | 790 | 418 | 250 | 260 | 170 | 121 | 119 | 116 | 109 | 84 | 82 | 58 | 54 | 73 | 90 | 261 | 67 | 85 | 251 | 186 |
Swell 2 Height (m) Direction Period (s) | S 13 | S 7 | S 14 | WSW 7 | SW 7 | SW 17 | SW 18 | SW 18 | NNE 7 | SSW 16 | SW 16 | NE 6 | SSW 17 | SW 16 | SW 17 | NNE 7 | SSW 16 | SW 16 | E 8 | SSW 16 |
| kJ | 212 | 92 | 334 | 16 | 11 | 74 | 80 | 79 | 31 | 100 | 129 | 33 | 200 | 274 | 291 | 32 | 322 | 261 | 19 | 212 |
Swell 3 Height (m) Direction Period (s) | S 16 | S 14 | S 6 | SSW 5 | E 9 | WSW 6 | W 13 | W 12 | SW 16 | S 12 | S 12 | SSW 18 | NNE 7 | E 8 | SSE 9 | E 7 | S 13 | S 12 | ESE 6 | SSE 12 |
| kJ | 127 | 250 | 23 | 5 | 25 | 4 | 31 | 25 | 129 | 45 | 45 | 207 | 29 | 19 | 15 | 24 | 54 | 47 | 13 | 50 |
Wind waves Height (m) Direction Period (s) | SSE 8 | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | — | NNE 6 | NE 6 | — | — | — | — | — | — | — | ENE 7 | — |
| kJ | 353 | — | 165 | 208 | 163 | 147 | 164 | 151 | — | 26 | 38 | — | — | — | — | — | — | — | 96 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 45 | 1 | 30 | 30 | 1 | 30 | 30 | 1 | 30 | 1 | 1 | 30 | 0 | 0 | 1 | 1 | 0 | 0 | 6 | 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.
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