Surf Forecasts:
In Betweens surf forecast from 17 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 11PM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 8AM (local time) - 6ft (1.9m), 7s period, ENE swell with 348 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 11PM (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 Wednesday (Aug 19) at 11PM. 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 1.9m 7s and forecast to arrive on Monday (Aug 24) at 8AM. 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 Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 19th Aug) | 1.5ft (0.5m) 16s |
| Best Surf | 11PM (Wed 19th Aug) | 1.5ft (0.5m) 16s |
| Most Powerful | 8AM (Mon 24th Aug) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for In Betweens over the next 16 days.
The Lowdown
Alright mate, Rusty here. Let’s have a look at what’s coming up for In-Betweens.
We’ve got a bit of a slow start with only weak, marginal waves through the first couple of days. Monday the 17th starts with a south swell around 3 ft at 14 seconds, but the cross-off wind and minor energy (combined energy of all swells directed here is 657) keeps things small and tricky. Not much to write home about. Tuesday the 18th brings a shift to a short-period easterly swell, but it’s a messy 4 ft from the ENE at only 7 seconds and the wind is fresh. That’s a no-go.
By Wednesday the 19th, the swell drops off and the period is still short, so it’s flat and poor. Thursday the 20th afternoon shows a little flicker of hope — a nice clean SSW swell at 2 ft with a long 18-second period and a gentle cross-off breeze. The combined energy is 254, which is weak, but the conditions are clean. Not really a standout, but it’s the best of the early days.
The real story starts to build late in the first week. By Friday the 21st morning, we’ve got a clean cross-off breeze and a 2 ft SW groundswell at 16 seconds. The energy is moderate (405). It’s small but clean, good for a log or a longboard. Saturday the 22nd morning is similar — 2 ft SW at 16 seconds, light cross-off, energy 403. Glassy conditions, small but fun. That’s the pick of the early period.
After the weekend, things get bigger and more aggressive. From Sunday the 23rd through Tuesday the 25th, the swell pumps up to 5 ft–8 ft from the ENE, but with a poor 7-second period, and the wind is fresh cross-off. The energy is climbing into the 800s, but the waves are short-period and wind-affected. Not great for a clean paddle session.
Then comes the real standout — the last few days of the month. From Wednesday the 27th of August through Friday the 29th, we see a solid 10 ft ENE swell with longer period, hitting 11 seconds by the 28th. The combined energy jumps massively — 1494 up to 2697. This is proper groundswell energy. The wind is cross-off and moderate, so it’ll be heavy and powerful. At 10 ft, this is only for experienced surfers — definitely too big for beginners. The long period makes it better suited to a point or reef, but In-Betweens is a reef break, so that’s a good match. The optimum swell direction here is SSE, but the ENE swell is still coming in strong. This is the best window of the whole outlook, but being more than a week out, take it with a pinch of salt.
After that, things drop off fast. Saturday the 29th afternoon shows a quick drop to 3 ft from the east, and Sunday the 30th is small again with a SSW swell but poor conditions. The final days of the month into early September show building ENE swell again, but with short period and fresh wind, it’s marginal at best.
So, to sum it up: the early week is small and clean but forgettable. The standout is the big, powerful ENE groundswell from the 27th to the 29th of August — that’s the one to circle on the calendar if you’re comfortable with 10 ft waves. For the rest, it’s a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 24°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | S 14 | S 14 | S 13 | ENE 7 | ENE 7 | S 13 | SW 16 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
Wave Graph | |||||||||||||||||||||
334 | 260 | 222 | 165 | 143 | 132 | 129 | 100 | 129 | 207 | 200 | 274 | 291 | 261 | 322 | 261 | 255 | 303 | 262 | 280 | 335 | |
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 | off | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 1:52PM0.66m | 1:46AM0.26m | |||||||||
Low Tide | 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 | 6:08AM0.10m | 9:18PM0.14m | ||||||||||
6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 24 | 24 | 24 | 24 | 24 | 27 | 26 | 27 | 28 | 29 | 28 | 29 | 28 | 28 | 27 | 27 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 7 | S 13 | ENE 7 | ENE 7 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | ENE 7 | SSW 16 | NE 7 | SW 16 | SSW 16 | SSE 13 | SSW 15 | SW 14 |
250 | 228 | 222 | 141 | 143 | 116 | 109 | 84 | 80 | 74 | 54 | 73 | 57 | 48 | 322 | 54 | 255 | 212 | 101 | 191 | 99 | |
Swell 2 Height (m) Direction Period (s) | S 14 | S 14 | SW 6 | S 13 | S 13 | SW 18 | NNE 7 | SSW 16 | NE 6 | SSW 18 | NE 7 | SW 16 | SW 17 | SW 16 | S 13 | SW 16 | E 8 | SSE 12 | SW 15 | WNW 12 | SSE 13 |
334 | 260 | 6 | 165 | 119 | 79 | 29 | 100 | 31 | 207 | 35 | 274 | 291 | 261 | 54 | 261 | 33 | 51 | 113 | 27 | 56 | |
Swell 3 Height (m) Direction Period (s) | S 6 | SSE 5 | W 11 | SW 17 | SW 18 | W 12 | SW 16 | S 12 | SW 16 | NE 6 | SSW 17 | E 8 | NNE 7 | NNE 6 | E 8 | E 6 | S 12 | WNW 10 | SSW 15 | S 11 | SSW 15 |
23 | 10 | 10 | 74 | 80 | 25 | 129 | 45 | 129 | 32 | 200 | 31 | 19 | 28 | 12 | 36 | 47 | 19 | 76 | 22 | 71 | |
Wind waves Height (m) Direction Period (s) | — | — | ENE 7 | — | — | ENE 7 | — | NE 6 | — | — | — | — | — | — | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
— | — | 203 | — | — | 132 | — | 31 | — | — | — | — | — | — | 68 | 129 | 113 | 303 | 262 | 280 | 335 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 2 | 3 | 30 | 30 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 30 | 30 | 30 | 32 | 45 | 30 |
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.











