Surf Forecasts:
Asu surf forecast from 17 Jul 2026:
- Best quality surf: Monday 20 Jul, 1AM (local time) - 3.5ft (1.0m), 19s period, SSW swell with glassy winds.
- Most powerful swell: Monday 20 Jul, 1PM (local time) - 5.5ft (1.7m), 17s period, SSW swell with 1,769 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 1PM (local time) - 4ft (1.2m), 13s period with SSW swell.
Best Forecast Surf Conditions for Asu this week:
The surf forecast for Asu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 19) at 1PM. The primary swell is predicted to be 1.2m and 13s period with a secondary swell of 0.5m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asu in the next 16 days are 1.7m 17s and forecast to arrive on Monday (Jul 20) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Sun 19th Jul) | 4ft (1.2m) 13s |
| Best Surf | 1AM (Mon 20th Jul) | 3.5ft (1.0m) 19s |
| Most Powerful | 1PM (Mon 20th Jul) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Asu over the next 16 days.
Short Range ForecastHeavy rain (total 20mm), heaviest during Fri morning. Warm (max 28°C on Fri morning, min 25°C on Sat afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Wed morning. Warm (max 28°C on Mon afternoon, min 27°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 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) | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 13 | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 13 | S 12 | SSW 12 | S 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 883 | 724 | 784 | 667 | 658 | 548 | 472 | 458 | 658 | 1549 | 1608 | 1591 | 1220 | 1061 | 862 | 475 | 390 | 475 | 425 | 111 | 345 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-off | cross | cross-on | cross | glassy | glassy | cross | cross-off | glassy | cross | cross-off | off | cross-off | off | off | off | off |
High Tide | 8:25PM0.58m | 8:35AM0.80m | 9:09PM0.60m | 9:12AM0.72m | 9:54PM0.61m | 9:48AM0.63m | 10:42PM0.61m | 10:24AM0.53m | 11:36PM0.59m | 11:02AM0.44m | 00:40AM0.57m | 11:57AM0.36m | 1:55AM0.57m | ||||||||
Low Tide | 2:31PM0.02m | 2:01AM0.08m | 3:04PM0.05m | 2:48AM0.13m | 3:35PM0.08m | 3:37AM0.19m | 4:04PM0.10m | 4:31AM0.25m | 4:35PM0.13m | 5:41AM0.29m | 5:09PM0.16m | 7:34AM0.31m | 5:55PM0.18m | ||||||||
 | |  | | |  |  |  |  | | |  | | | | | | | | | | |
 | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — |
mm | 7 | 3 | 3 | 4 | 3 | — | — | — | — | — | — | 2 | — | — | 1 | 3 | — | — | 1 | — | 5 |
Temp °C | 28 | 28 | 28 | 28 | 26 | 25 | 26 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 32 | 31 | 31 | 31 | 27 | 25 | 29 | 30 | 31 | 31 | 30 | 31 | 31 | 30 | 29 | 32 | 30 | 29 | 30 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 13 | S 12 | S 7 | S 10 |
| kJ | 883 | 724 | 784 | 667 | 658 | 548 | 472 | 458 | 346 | 1549 | 1608 | 1591 | 1220 | 1061 | 862 | 475 | 390 | 475 | 425 | 88 | 345 |
Swell 2 Height (m) Direction Period (s) | WNW 8 | W 8 | W 8 | W 8 | WNW 8 | NW 8 | S 8 | S 8 | SSW 19 | WNW 7 | WNW 7 | W 8 | W 8 | W 8 | WNW 8 | S 7 | WNW 7 | WNW 10 | WNW 10 | SSW 12 | SSW 13 |
| kJ | 37 | 48 | 33 | 30 | 33 | 28 | 33 | 33 | 658 | 18 | 17 | 33 | 29 | 33 | 37 | 33 | 18 | 35 | 18 | 111 | 70 |
Swell 3 Height (m) Direction Period (s) | S 9 | S 9 | SSE 8 | SSE 8 | S 8 | SSE 8 | WNW 7 | WNW 7 | SSE 7 | SSE 7 | SSE 7 | SSE 6 | SSE 8 | W 9 | W 8 | WNW 8 | WNW 10 | SSW 16 | WNW 7 | S 9 | SW 16 |
| kJ | 38 | 39 | 21 | 19 | 29 | 36 | 18 | 17 | 18 | 18 | 15 | 13 | 11 | 25 | 19 | 19 | 20 | 51 | 11 | 42 | 91 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 7 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 68 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 15 | 15 | 15 | 51 | 51 | 15 | 126 | 0 | 0 | 126 | 0 | 0 | 76 | 126 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Nias | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 Asu 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 Asu Surf forecast
The above surf forecast table for Asu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Asu can be found by selecting the local surf guide option on the grey menu. Our Asu 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 (Asu) 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 Asu 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 Nias? If you are looking for accommodation near Asu, camping, hotels and holiday cottages in Nias, consider staying in Afia which is 60 km (37 miles) away.
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