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Shacks surfForecast / HAW – Big Island / USA
12 Day Weather and Surf, issued 7 am Friday 16 May 2025 HST
Best Forecast Surf Conditions for Shacks this week:
The surf forecast for Shacks over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (May 18) at 2AM. The primary swell is predicted to be 2.0m and 8s period with a secondary swell of 0.3m and 18s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Shacks in the next 12 days are 2.3m 8s and forecast to arrive on Saturday (May 17) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 10s period and expected on Friday (May 16) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 18th May) | 6.5ft (2.0m) 8s |
| Best Surf | 2AM (Sun 18th May) | 6.5ft (2.0m) 8s |
| Most Powerful | 5PM (Sat 17th May) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Shacks over the next 12 days.
Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | |||||||||||||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 337 | 513 | 383 | 229 | 744 | 542 | 476 | 516 | 418 | 363 | 313 | 363 | 313 | 305 | 157 | 305 | 212 | 309 | 351 | 309 | 317 | 358 | 349 | 309 | 301 | 294 | 251 | 149 | 123 | 110 | 126 | 98 | 98 | 114 | 112 | 129 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- on | cross- on | cross | cross- on | cross | cross- on | glass | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- on | cross | cross- off |
High Tide / height (m) | 6:11PM 0.92 | 5:12AM 0.44 | 7:01PM 0.89 | 6:25AM 0.41 | 7:56PM 0.87 | 8:21AM 0.42 | 8:55PM 0.85 | 10:12AM 0.50 | 9:53PM 0.82 | 11:25AM 0.62 | 10:48PM 0.79 | 12:19PM 0.76 | 11:39PM 0.75 | 1:06PM 0.90 | 12:28AM 0.70 | 1:50PM 1.01 | 1:15AM 0.65 | 2:35PM 1.10 | 2:01AM 0.60 | 3:19PM 1.14 | 2:45AM 0.56 | 4:05PM 1.15 | 3:30AM 0.52 | |||||||||||||
Low Tide / height (m) | 10:31AM 0.12 | 1:29AM 0.36 | 11:10AM 0.16 | 2:39AM 0.35 | 12:00PM 0.23 | 3:41AM 0.31 | 1:14PM 0.30 | 4:27AM 0.26 | 2:56PM 0.36 | 5:04AM 0.20 | 4:39PM 0.38 | 5:39AM 0.14 | 6:03PM 0.37 | 6:14AM 0.07 | 7:13PM 0.33 | 6:49AM 0.02 | 8:14PM 0.30 | 7:26AM -0.02 | 9:10PM 0.27 | 8:05AM -0.04 | 10:04PM 0.26 | 8:45AM -0.04 | 10:57PM 0.26 | |||||||||||||
Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | |||||||||||||||||||||||||
| Sunrise | 5:43 | - | - | 5:43 | - | - | 5:43 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:41 | - | - | 5:39 | - | - |
| Sunset | - | 6:46 | - | - | 6:47 | - | - | 6:47 | - | - | 6:47 | - | - | 6:49 | - | - | 6:49 | - | - | 6:50 | - | - | 6:50 | - | - | 6:50 | - | - | 6:51 | - | - | 6:51 | - | - | 6:52 | - |
 | |  | | | | | |  |  |  |  | | | | | | | | | | | | | | | | | | | | | | | |  | |
Rain (mm) | 5 | 6 | 6 | 2 | 2 | 7 | 3 | 3 | - | 2 | - | 2 | 1 | - | 2 | - | - | 8 | - | - | 3 | - | 1 | 6 | - | - | 3 | - | - | 3 | - | - | - | 1 | - | - |
| Temp. °C | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 25 | 24 | 24 | 24 | 24 |
| Feels °C (?) | 23 | 23 | 23 | 24 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 23 | 24 | 24 | 24 | 23 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 25 | 25 | 26 | 24 | 26 | 25 | 24 | 23 | 24 |
Short Range Forecast: Heavy rain (total 34mm), heaviest during Fri morning. Warm (max 24°C on Fri morning, min 23°C on Fri morning). Wind will be generally light. | Days 3-6 Weather Summary Moderate rain (total 15mm), heaviest on Wed night. Warm (max 24°C on Mon afternoon, min 22°C on Tue night). Wind will be generally light. | Days 6-9 Weather Summary Moderate rain (total 13mm), heaviest on Fri night. Warm (max 24°C on Thu morning, min 22°C on Fri night). Wind will be generally light. | Long Range Forecast: Light rain (total 4mm), mostly falling on Sun night. Warm (max 25°C on Mon afternoon, min 23°C on Sun morning). Wind will be generally light. | |||||||||||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Shacks surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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 12 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.
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