Surf Forecasts:
Scar Reef surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 5PM (local time) - 5ft (1.6m), 16s period, SW swell with glassy winds.
- Most powerful swell: Thursday 20 Aug, 2AM (local time) - 10ft (3.0m), 17s period, SW swell with 4,432 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 5PM (local time) - 5ft (1.6m), 16s period with SW swell.
Best Forecast Surf Conditions for Scar Reef this week:
The surf forecast for Scar Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 5PM. The primary swell is predicted to be 1.6m and 16s period with a secondary swell of 1.2m and 20s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Scar Reef in the next 16 days are 3.0m 17s and forecast to arrive on Thursday (Aug 20) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Thursday (Aug 20) at 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 18th Aug) | 5ft (1.6m) 16s |
| Best Surf | 5PM (Tue 18th Aug) | 5ft (1.6m) 16s |
| Most Powerful | 2AM (Thu 20th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Scar Reef over the next 16 days.
The Lowdown
Alright, Rusty here again. Same setup, different numbers.
We’ve got a proper run of swell coming through. This stretch of waves is for the experienced crew only once it gets going, with most of the surf in the overhead-plus range and long-period groundswell pushing in. The standout is Scar Reef (reef and point) and it's firing from the get-go. Water temp is around 80°, which is pretty much normal for this time of year.
Tuesday the 18th kicks off with clean, glassy conditions in the morning. Swell is 4 ft from the SSW with a very long 16-second period, and wave energy is moderate (1961). The wind is dead glass – that’s about as good as it gets for surface texture. By the afternoon, it builds to 5 ft from the SW, still glassy, and energy jumps up. This is a solid start.
Wednesday the 19th morning is the first real standout. The swell hits 8 ft from the SW with an 18-second period – that’s proper groundswell – and the energy is strong (3607). It's glassy calm. This is big, powerful, and clean, but it's expert territory. The afternoon holds at 8 ft with clean conditions and a slight cross-off breeze. This is the best wave on offer. Over 8 ft and 18 seconds – only for those who know what they’re doing on a reef setup.
Thursday the 20th stays solid with 8 ft SW swell in the morning, 16-second period, and clean. Still only for the strong paddlers out there. The energy stays high (3874). The break is fairly consistent, so you won’t be waiting long.
Friday the 21st is still excellent, with the morning at 6 ft SW and a solid 15-second period, clean. The afternoon brings a bump to 8 ft SW with 17 seconds and offshore wind – really nice shape, lined up. That’s another standout session.
Saturday the 22nd and Sunday the 23rd see a slight drop in size but still solid, with clean conditions and cross-off or offshore winds. Swell stays in the 6 ft to 7 ft range, period between 15 and 16 seconds. Still good, but the peak days were mid-week.
Monday the 24th to Tuesday the 25th, still pushing 6 ft to 7 ft SW groundswell, clean, but the winds become a bit more noticeable – still manageable. Energy starts to drop slowly.
Wednesday the 26th and Thursday the 27th see the swell back off more, with heights around 4 ft to 5 ft, and the period drops to 13-14 seconds. It’s still rideable but nothing like the first few days. The energy is moderate now.
Friday the 28th through to Monday the 31st is where things get tricky. Swell is in the 4 ft to 7 ft range, periods bounce around, but the wind stays cross-off and fresh – 9 to 12 mph. The scores drop. It’s more of a background swell, and the conditions are less ideal. Still surfable for those who are keen.
Then we get a late burst: Tuesday the 1st of September and Wednesday the 2nd bring back bigger swell – 7 ft to 8 ft from the SW, 16-17 seconds, strong energy (over 3300). Conditions are clean with light breezes. This is another serious window, but it’s two weeks out, so keep an eye on it. If it holds, it’ll be another set of solid, powerful waves for the experienced crew.
Overall, the best windows are Wednesday the 19th and Friday the 21st – that’s where the swell, period, and wind all line up for perfection. Crowds are possible here, but with the size and the reef factor, it tends to thin out.
Stay safe out there.
- Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 22°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 22°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | SSW 16 | SW 16 | SW 16 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 15 |
Wave Graph | |||||||||||||||||||||
897 | 1239 | 1532 | 3578 | 4045 | 4432 | 3676 | 3177 | 2214 | 1325 | 3110 | 2765 | 2472 | 2151 | 1716 | 1550 | 1297 | 1261 | 1880 | 1479 | 1087 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | off | cross-off |
High Tide | 2:11PM1.10m | 2:16AM1.53m | 2:59PM0.93m | 2:47AM1.49m | 4:40PM0.79m | 3:27AM1.42m | 4:34AM1.36m | 6:18AM1.35m | 7:41AM1.41m | 11:17PM1.08m | |||||||||||
Low Tide | 8:28AM0.52m | 7:34PM0.63m | 9:24AM0.56m | 7:38PM0.72m | 10:42AM0.59m | 7:02PM0.77m | 12:57PM0.57m | 2:36PM0.47m | 3:21PM0.37m | 3:53PM0.29m | 2:37AM1.00m | ||||||||||
6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:12 | — | — | 6:12 | — | — | 6:12 | — | — | 6:12 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 24 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 27 | 24 | 26 | 27 | 25 | 26 | 27 | 24 | 27 | 28 | 24 |
Feels °C | 27 | 28 | 26 | 28 | 29 | 27 | 27 | 28 | 27 | 27 | 28 | 26 | 27 | 28 | 27 | 27 | 27 | 25 | 28 | 28 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SW 16 | SW 16 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 15 |
897 | 1239 | 1532 | 3578 | 4045 | 4432 | 3676 | 3177 | 2214 | 1325 | 3110 | 2765 | 2472 | 2151 | 1716 | 1550 | 1297 | 1261 | 1880 | 1479 | 1087 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 20 | SW 19 | SE 6 | SE 6 | SE 6 | SE 7 | SE 6 | SE 6 | SSW 18 | — | SE 6 | SE 7 | S 26 | SSW 24 | SSW 21 | SSW 19 | SSW 18 | SE 6 | SW 20 | SW 18 |
406 | 1157 | 1088 | 29 | 42 | 34 | 51 | 64 | 59 | 1056 | — | 43 | 36 | 13 | 54 | 251 | 913 | 964 | 25 | 306 | 522 | |
Swell 3 Height (m) Direction Period (s) | SW 21 | SE 6 | — | — | — | — | — | — | — | SE 7 | — | — | — | — | — | — | — | — | SW 21 | — | — |
658 | 32 | — | — | — | — | — | — | — | 57 | — | — | — | — | — | — | — | — | 72 | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 6 | ESE 6 | SE 5 | ESE 6 | ESE 6 | ESE 6 | SE 7 | SE 6 | SE 6 | ESE 7 | SE 6 | ESE 6 | SE 7 | SE 6 | SE 5 | SE 6 | SE 5 | SE 5 | ESE 6 | SE 5 | SE 5 |
65 | 104 | 29 | 115 | 107 | 103 | 147 | 195 | 172 | 159 | 82 | 128 | 131 | 35 | 28 | 35 | 43 | 28 | 93 | 32 | 23 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Sumbawa | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
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Information about the Scar Reef Surf forecast
The above surf forecast table for Scar Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Scar Reef can be found by selecting the local surf guide option on the grey menu. Our Scar Reef 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 (Scar Reef) 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 Scar Reef 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.
Scar Reef is 55 km (34 miles) from the city of Praya. If you plan a holiday in Sumbawa, look for hotels and other accommodation in Praya. Praya has rooms for a wide range of budgets as well as car hire and transport links.











