
Surf Forecasts:
Shacks surf forecast from 21 Jul 2026:
- Best quality surf: Sunday 26 Jul, 5AM (local time) - 4.5ft (1.4m), 15s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 27 Jul, 2AM (local time) - 7ft (2.1m), 15s period, E swell with 1,950 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 5AM (local time) - 4.5ft (1.4m), 15s period with E swell.
Best Forecast Surf Conditions for Shacks this week:
The surf forecast for Shacks over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 26) at 5AM. The primary swell is predicted to be 1.4m and 15s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Shacks in the next 16 days are 2.1m 15s and forecast to arrive on Monday (Jul 27) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Sunday (Jul 26) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sun 26th Jul) | 4.5ft (1.4m) 15s |
| Best Surf | 5AM (Sun 26th Jul) | 4.5ft (1.4m) 15s |
| Most Powerful | 2AM (Mon 27th Jul) | 7ft (2.1m) 15s |
Table - best surf conditions forecast for Shacks over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s talk about what’s cooking at Shacks over the next couple of weeks. This is a reef break, exposed to the swell, and it’s got some potential if you play it smart. The water’s running at 80°, which is about average for this time of year, nothing wild.
Starting Tuesday the 21st of July, it’s a slow go. Tuesday morning brings rain showers and a 3ft southerly swell, 14-second period, with an easterly breeze that’s onshore – not doing us any favours. The combined swell energy is moderate (638), but conditions are marginal. By the afternoon, it’s worse with a cross-onshore wind and poor surf. Wednesday the 22nd is a bummer too: a 4ft easterly swell, 12-second period, but a cross-shore wind keeps it choppy, and the energy sits at moderate (744). The afternoon is a mess with cross-onshore winds. First few days are a bit of a dud.
Thursday the 23rd through Saturday the 25th, we’ve got small SSW to S swells, 2ft to 3ft, with very long periods of 18 to 21 seconds. That long-period groundswell can work a reef like Shacks, but the wind is cross-shore and often cross-onshore from the NE at 12 to 15 mph, so it’s choppy and not clean. The energy is moderate (up to 1039), but quality is poor. Not worth rushing out.
Then we hit the first standout. Sunday the 26th of July morning: a 5ft easterly swell, 16-second period, with a NNE cross-shore breeze at 12 mph. The combined energy jumps to strong (1670). It’s still a bit lumpy, but the size is building. By the afternoon, the swell bumps to 5ft, period 15 seconds, energy very strong (1955), but the wind picks up to 19 mph and it gets messy with a fresh cross-shore chop. Still, there’s potential if you can snag a clean one.
Now, the real standout lands on Tuesday the 28th of July. Monday the 27th has 7ft easterly swell, 14-second period, with cross-shore winds and very strong energy (2080) – but still a bit lumpy. Come Tuesday morning, the swell holds at 7ft from the ENE, 13-second period, and the wind swings to a north cross-offshore at 12 mph. The conditions turn clean, with strong energy (1461). This is the best run – a proper, clean, lined-up reef wave at Shacks. It’s intermediate-friendly for size (7ft is a solid step up), but not for beginners. The afternoon repeats the same goodness, cross-offshore and clean. Mark Tuesday the 28th on your calendar.
Wednesday the 29th still has 6ft to 6ft ENE swell, 11-second period, but the wind goes cross-shore again and the energy drops (1149 to 874). It’s okay, not a standout.
From Thursday the 30th onward, it fades fast. Swell drops to 4ft and below, periods shorten to 8 or 9 seconds, and the winds stay cross or cross-onshore. The combined energy drops to weak to moderate (349 and lower). Friday the 31st July is a write-off with poor conditions. A small bump on Saturday the 1st of August brings 7ft easterly swell, but only 8-second period and cross-shore winds – poor quality, and the afternoon is choppy and cross-onshore. Sunday the 2nd and Monday the 3rd show 8ft to 6ft ENE swell, but with cross-onshore winds and short period (9 seconds). It’s big but messy – more for experts who don’t mind a fight. By Tuesday the 4th and Wednesday the 5th of August, the swell drops below 5ft with light onshore winds and poor surf.
Bottom line: Tuesday the 28th of July is your day. Clean, cross-offshore wind, solid 7ft ENE swell, and a reef that can handle it. Everything else is a compromise. Get out there for that one.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Wed night. Warm (max 26°C on Tue morning, min 24°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Warm (max 26°C on Sat morning, min 24°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
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 | E 12 | E 12 | E 11 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 18 | ENE 8 | S 20 | SSW 18 | E 15 | E 16 | E 15 | E 15 | E 14 | E 14 | E 13 |
Wave Graph | |||||||||||||||||||||
390 | 363 | 336 | 496 | 472 | 480 | 407 | 507 | 348 | 326 | 329 | 410 | 373 | 553 | 766 | 1060 | 1190 | 1950 | 1855 | 1779 | 1443 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross | cross-on | cross | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-off |
High Tide | 9:50AM0.70m | 7:38PM0.57m | 11:13AM0.75m | 8:21PM0.50m | 12:18PM0.80m | 10:25PM0.45m | 1:06PM0.85m | 00:02AM0.44m | 1:46PM0.90m | 1:01AM0.46m | 2:20PM0.95m | 1:45AM0.49m | 2:52PM0.98m | 2:22AM0.53m | |||||||
Low Tide | 3:45PM0.52m | 3:05AM0.21m | 6:47PM0.49m | 4:03AM0.22m | 8:03PM0.43m | 5:07AM0.20m | 8:29PM0.38m | 6:05AM0.17m | 8:52PM0.34m | 6:54AM0.13m | 9:15PM0.31m | 7:35AM0.09m | 9:39PM0.28m | ||||||||
5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | |
— | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | |
mm | 2 | — | 3 | — | — | 2 | — | — | 2 | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 25 | 23 | 26 | 25 | 25 | 24 | 24 | 23 | 24 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 12 | E 12 | E 11 | E 7 | ENE 7 | ENE 7 | ENE 7 | SSW 18 | NE 8 | ENE 8 | E 8 | E 15 | E 16 | E 15 | E 15 | E 14 | E 14 | E 13 |
187 | 189 | 142 | 496 | 472 | 475 | 199 | 219 | 212 | 254 | 318 | 274 | 345 | 141 | 766 | 1060 | 1190 | 1950 | 1855 | 1779 | 1443 | |
Swell 2 Height (m) Direction Period (s) | S 14 | S 14 | S 13 | S 13 | S 13 | SSW 22 | SSW 20 | SSW 20 | S 12 | SSW 18 | S 21 | ESE 8 | SSW 16 | SSW 18 | NNE 8 | E 8 | E 8 | NNE 8 | NNE 8 | SSW 14 | NNE 8 |
390 | 363 | 336 | 166 | 206 | 480 | 407 | 507 | 199 | 326 | 329 | 133 | 214 | 553 | 197 | 173 | 117 | 162 | 158 | 218 | 128 | |
Swell 3 Height (m) Direction Period (s) | E 11 | E 11 | E 12 | S 11 | SSW 23 | S 12 | S 11 | S 13 | SSW 18 | S 12 | S 12 | SSW 20 | S 20 | E 16 | E 8 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SE 10 | S 14 |
61 | 63 | 130 | 82 | 426 | 141 | 125 | 167 | 348 | 103 | 98 | 403 | 373 | 129 | 137 | 437 | 427 | 324 | 225 | 35 | 200 | |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 7 | NNE 7 | — | NNE 6 | — | — | NNE 7 | ENE 7 | ENE 8 | — | NNE 8 | — | NNE 8 | NE 8 | — | — | NNE 7 | — |
— | — | — | 46 | 31 | — | 34 | — | — | 53 | 294 | 410 | — | 183 | — | 230 | 221 | — | — | 134 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 35 | 39 | 116 | 211 | 121 | 34 | 211 | 219 | 34 | 36 | 36 | 36 | 211 | 213 | 39 | 36 | 211 | 111 | 111 | 209 | 43 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Shacks Surf forecast
The above surf forecast table for Shacks provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Shacks can be found by selecting the local surf guide option on the grey menu. Our Shacks 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 (Shacks) 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 Shacks 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.
Shacks is 38 km (24 miles) from Hilo. If you plan a vacation in Big Island, look for hotels and other accommodation in Hilo. Hilo has rooms for a wide range of budgets as well as car hire and transport links.










