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Treasure Island surfForecast / Banyak Islands / Indonesia
12 Day Weather and Surf, issued 12 am Sunday 20 Jul 2025 WIB
Best Forecast Surf Conditions for Treasure Island this week:
The surf forecast for Treasure Island over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 20) at 7AM. The primary swell is predicted to be 1.0m and 16s period with a secondary swell of 0.9m and 16s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Treasure Island in the next 12 days are 1.3m 16s and forecast to arrive on Saturday (Jul 26) at 4PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 12s period and expected on Friday (Jul 25) at 4PM.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 20th Jul) | 3.5ft (1.0m) 16s |
| Best Surf | 7AM (Sun 20th Jul) | 3.5ft (1.0m) 16s |
| Most Powerful | 4PM (Sat 26th Jul) | 4.5ft (1.3m) 16s |
Table - best surf conditions forecast for Treasure Island over the next 12 days.
Short Range Forecast Heavy rain (total 24mm), heaviest during Sun morning. Warm (max 28°C on Sat night, min 26°C on Mon morning). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Thu night. Warm (max 28°C on Tue night, min 27°C on Tue night). Wind will be generally light. | |||||||||||||||||||||
Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Sat 26 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 16 | 16 | 17 | 17 | 16 | 15 | 14 | 14 | 13 | 13 | 18 | 14 | 13 | 20 | 20 | 18 | 18 | 18 | 16 | 16 | 16 | |
Wave (?)Graph  | ||||||||||||||||||||||
| Energy (?) | 831 | 752 | 914 | 856 | 773 | 602 | 476 | 514 | 321 | 273 | 426 | 306 | 469 | 517 | 422 | 540 | 553 | 787 | 726 | 691 | 788 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- off | cross- off | glass | cross- off | cross- off | on | cross- off | glass | glass | cross- off | cross | cross- on | cross- off | cross | cross- on | cross | cross | glass | glass | |
High Tide / height (m) | 1:37AM 0.62 | 1:26PM 0.38 | 2:54AM 0.65 | 3:06PM 0.34 | 4:04AM 0.69 | 4:29PM 0.35 | 5:02AM 0.74 | 5:29PM 0.38 | 5:52AM 0.78 | 6:17PM 0.42 | 6:36AM 0.81 | 7:00PM 0.47 | 7:16AM 0.81 | |||||||||
Low Tide / height (m) | 8:43AM 0.26 | 7:20PM 0.14 | 10:23AM 0.20 | 8:38PM 0.13 | 11:27AM 0.14 | 9:52PM 0.11 | 12:15PM 0.09 | 10:53PM 0.08 | 12:55PM 0.06 | 11:45PM 0.06 | 1:29PM 0.04 | 12:30AM 0.05 | 2:00PM 0.04 | |||||||||
Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Sat 26 | ||||||||||||||||
| Sunrise | - | 6:30 | - | - | 6:30 | - | - | 6:30 | - | - | 6:30 | - | - | 6:30 | - | - | 6:30 | - | - | 6:30 | - | |
| Sunset | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | |
 |  |  | |  | |  | |  |  | | | | | |  | | | | | | ||
Rain (mm) | 7 | 7 | - | 8 | 2 | - | - | - | - | - | - | - | - | - | - | 4 | 1 | - | 4 | 1 | - | |
| Temp. °C | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | |
| Feels °C (?) | 30 | 30 | 31 | 31 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 31 | 31 | 30 | 31 | 31 | 32 | 33 | 32 | |
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Banyak Islands
The wind is still cross-off at Treasure Island (light winds from the SSW at Medan/Polonia Airport 216 km from Treasure Island). 0.7m 16s long period groundswell from the SSW with a 0.4m 8s swell from the W and a 0.3m 8s swell from the SSW as well as a 0.2m 3s local chop from the SW. Swells combining to make to make bigger set waves.
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 Treasure Island 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 Treasure Island Surf forecast
The above surf forecast table for Treasure Island provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Treasure Island can be found by selecting the local surf guide option on the grey menu. Our Treasure Island 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 (Treasure Island) 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 Treasure Island 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.
Are you planning a holiday in Banyak Islands? If you are looking for accommodation near Treasure Island, camping, hotels and holiday cottages in Banyak Islands, consider staying in Afia which is 86 km (53 miles) away.
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