
Surf Forecasts:
In Betweens surf forecast from 15 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 11AM (local time) - 7ft (2.1m), 10s period, ENE swell with 782 kJ wave energy.
Best Forecast Surf Conditions for In Betweens this week:
The most powerful waves expected at In Betweens in the next 16 days are 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Wednesday (Sep 16) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 17th Sep) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for In Betweens over the next 16 days.
The Lowdown
Alright, let's get real about what's on offer here.
For the next couple of days at In Betweens, the surf is pretty weak. Tuesday morning we're looking at a puny 2ft southwest groundswell with a 20-second period. The water's around 81°, which is pretty normal for this time of year. It's clean, but there's barely any energy in it, coming in at (490). The cross-off breeze from the ENE at 12 mph is holding it together, but there's just nothing to ride.
Wednesday bumps up slightly to 3ft, but the period drops to 18 seconds. The wind picks up to 19 mph, still cross-off, but it's still a marginal call. It's not doing much for me.
Now, Thursday is where we see some size, but it's not the good kind. The swell jumps to 7ft, but it's short-period junk at 10 seconds, coming from the ENE. There's also the chance of a thunderstorm. The energy is strong, up at (1207), but that period is way too short for this reef. It's going to be a washing machine. Winds are fresh cross-off at 22 mph. If you're a masochist or a kite surfer, maybe you're into it, but for a paddle surfer, this looks more like a battle than a session.
After that, Friday drops back to a more manageable 3ft from the SSW with a better 17-second period. The energy remains moderate (1101), but the wind strengthens to a strong 25 mph in the afternoon, which will mess up the surface. Morning is cleaner, but the size is still small.
The weekend is a complete bust. Saturday and Sunday bring back that 6ft short-period ENE windswell at a shocking 7 seconds. The energy is there, but it's all over the place. It's poor surf, full stop. With that period, it'll be fat and sectiony. And with a strong cross-off breeze, it's just not an appealing prospect.
There's a poor-to-marginal run that lasts from the 21st through the 26th. The swell stays above 5ft, but it's all windswell. The winds are strong and cross-off, but it's just not the right kind of wave for this spot. There's a day on the 23rd where the energy peaks at (1182), but the period remains poor and the wind goes more east, making it cross and choppy. It's a long, bleak stretch.
Now, let's talk about the light at the end of the tunnel. On Friday the 25th, the afternoon looks promising. The swell drops right back to 3ft, but the period lengthens to a nice 15 seconds from the SSW. The wind drops to a gentle 9 mph cross-off. The energy is moderate (556), and the forecast calls for "very good surf conditions". This is the first bright spot we've had.
Then we have the weekend of the 26th and 27th. Saturday morning has a light cross-on breeze, which isn't perfect, but the swell is a clean 3ft from the SSW at 15 seconds. The afternoon looks even better with a near-calm 3 mph cross breeze and a 3ft swell at 16 seconds. Still small, but it's clean and has some push. Sunday holds similar size but the wind shifts and makes it look a bit less clean.
For the last few days of the month, we see those small, clean SSW swells continue, but the energy weakens significantly, dropping to (199) at times. There's a final worthwhile window on Tuesday the 29th afternoon with a 3ft SSW swell at 16 seconds, a light 6 mph ENE wind, and the forecast says "good surf conditions".
So, if you’re looking for the standout window, it’s Friday afternoon and the weekend. It’s not big, but it’s clean, and that’s worth its weight in gold after what we've been looking at. The bigger swells are just chaotic, short-period messes. The long-range stuff looks promising, but it's a long way out, so don't book your flights just yet.
Remember, this is In Betweens, a reef that needs a long-period, clean swell. The big, short-period stuff is just not our friend. For a spot like this, it’s better to have clean 3ft waves than messy 6ft ones.
Stay stoked.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu night. Warm (max 27°C on Tue morning, min 26°C on Tue morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri morning, min 25°C on Sat night). Mainly strong winds. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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) | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | ENE 10 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | E 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 8 |
Wave Graph | |||||||||||||||||||||
392 | 384 | 470 | 455 | 541 | 429 | 782 | 592 | 644 | 622 | 580 | 539 | 382 | 387 | 400 | 362 | 373 | 447 | 403 | 414 | 449 | |
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 | 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 |
High Tide | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | 10:27AM0.57m | 11:01PM0.21m | 11:34AM0.59m | 00:19AM0.23m | 12:26PM0.61m | 00:59AM0.27m | 1:06PM0.62m | 1:32AM0.32m | ||||||||
Low Tide | 2:03PM0.23m | 00:07AM0.11m | 4:06PM0.24m | 00:38AM0.13m | 7:14PM0.21m | 1:26AM0.16m | 7:23PM0.18m | 2:56AM0.18m | 7:43PM0.16m | 4:35AM0.17m | 8:01PM0.15m | 5:47AM0.16m | 8:17PM0.13m | ||||||||
6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | |
mm | — | — | — | — | — | — | — | 2 | 7 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 26 | 26 | 26 | 26 | 25 | 26 | 27 | 26 |
Feels °C | 28 | 28 | 27 | 26 | 26 | 26 | 26 | 27 | 26 | 24 | 24 | 24 | 25 | 23 | 24 | 24 | 22 | 22 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | S 16 | SSW 15 | SSW 14 | SSW 14 | S 14 | S 13 |
392 | 384 | 470 | 455 | 541 | 429 | 258 | 322 | 644 | 622 | 580 | 539 | 382 | 387 | 350 | 239 | 300 | 350 | 265 | 232 | 168 | |
Swell 2 Height (m) Direction Period (s) | NNE 8 | E 12 | NNE 8 | SW 12 | E 10 | E 10 | SSW 20 | SSW 19 | WSW 8 | SSE 9 | SSE 7 | SSE 7 | SSW 18 | S 18 | SW 16 | SSW 15 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 |
36 | 68 | 32 | 35 | 100 | 125 | 149 | 210 | 7 | 7 | 18 | 21 | 108 | 99 | 121 | 146 | 104 | 33 | 52 | 46 | 46 | |
Swell 3 Height (m) Direction Period (s) | E 12 | SW 12 | E 11 | S 6 | SW 11 | SW 11 | SW 11 | SSW 10 | SSE 10 | W 9 | W 9 | S 20 | SSE 6 | SSE 6 | SSW 14 | SSE 8 | W 13 | W 12 | W 13 | W 11 | W 12 |
46 | 38 | 58 | 3 | 31 | 19 | 18 | 10 | 9 | 6 | 6 | 67 | 12 | 13 | 37 | 6 | 3 | 11 | 13 | 10 | 11 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | NE 8 | ENE 5 | ENE 10 | NE 5 | NE 6 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 8 |
52 | 71 | 51 | 314 | 100 | 203 | 782 | 592 | 606 | 472 | 427 | 416 | 350 | 359 | 400 | 362 | 373 | 447 | 403 | 414 | 449 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 1 | 1 | 30 | 30 | 30 | 30 | 32 | 30 | 38 | 41 | 38 | 31 | 38 | 32 | 38 | 41 | 30 | 34 | 39 | 33 |
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.










