Surf Forecasts:
Scar Reef surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5PM (local time) - 7.5ft (2.3m), 17s period, SW swell with offshore winds.
- Most powerful swell: Friday 28 Aug, 5AM (local time) - 10ft (3.0m), 18s period, SSW swell with 4,865 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5PM (local time) - 7.5ft (2.3m), 17s 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 Friday (Aug 21) at 5PM. The primary swell is predicted to be 2.3m and 17s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Scar Reef in the next 16 days are 3.0m 18s and forecast to arrive on Friday (Aug 28) at 5AM. Winds are predicted to be 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 Tuesday (Aug 25) at 5PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Fri 21st Aug) | 7.5ft (2.3m) 17s |
| Best Surf | 5PM (Fri 21st Aug) | 7.5ft (2.3m) 17s |
| Most Powerful | 5AM (Fri 28th Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Scar Reef over the next 16 days.
The Lowdown
Alright, let’s break it down in feet and miles per hour. We’ve got a solid run of groundswell heading into Scar Reef over the next couple of weeks. This is a reef and point setup, sheltered from the south-east, and it loves a south-west swell. Water temp’s about 80°F – pretty average for the season. Straight into it from Friday the 21st of August.
Friday morning sees a clean 6ft south-west swell, period 15 seconds, light cross-offish wind from the south at 3 mph. That’s proper groundswell energy. By afternoon it’s even better: 8ft, 17-second period, offshore east-south-east at 3 mph, totally glassy. Strong energy. This is top shelf for the experienced surfer.
Saturday the 22nd: morning has 7ft south-south-west swell, 16 seconds, cross-off breeze, clean. Then Saturday afternoon – magic. Glassy, 7ft, 16 seconds, light east-south-east offshore. Mirror finish. This could be one of the standout sessions.
Sunday 23rd stays clean with 7ft and 15 seconds, cross-off in the morning, offshore by afternoon. Monday 24th and Tuesday 25th hold 6ft to 7ft, good periods, offshore winds. Wednesday 26th eases to 6ft with 14 seconds, clean. Thursday 27th drops to 4ft and then 3ft, but that afternoon has a 20-second period – very long period groundswell. On the reef it’ll wrap nicely.
Friday 28th of August is a standout: swell jumps to 8ft south-west, 16 seconds, strong offshore from the south-south-east at 12 mph – that’s serious power. Over 2.5m (8ft) is expert territory. Clean but heavy.
Saturday 29th has 7ft to 6ft, clean, moderate offshore. Sunday 30th drops to 5ft, 13 seconds. Monday 31st goes small – 2ft to 3ft but with a very long 19-second period. For a reef, that can produce some nice ones.
Tuesday the 1st of September: swell jumps to 6ft south-west, 18 seconds, light wind. Afternoon goes 7ft, 17 seconds. Wednesday 2nd holds at 8ft, 17 seconds, excellent conditions – that’s the other absolute standout. Thursday 3rd down to 7ft, clean. Friday 4th settles to 6ft. Saturday 5th of September: 6ft south-south-west, 18 seconds, light winds, building to 7ft in the afternoon. Another strong one, though it’s a way out.
Crowds at Scar Reef are “sometimes” – expect company on the best days. The spot breaks fairly consistently. Best on offer: Saturday 22nd afternoon – glassy, solid groundswell. And Wednesday 2nd September – huge energy, clean, offshore, proper reef lines.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat afternoon, min 22°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Mon afternoon, min 22°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Fri 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 14 | SSW 15 | SW 16 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SW 16 | SW 20 | SSW 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3110 | 2567 | 2503 | 2151 | 1809 | 1937 | 1488 | 1261 | 1856 | 1608 | 1057 | 1206 | 1449 | 1319 | 1127 | 777 | 462 | 729 | 945 | 4057 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | glassy | cross-off | cross-off | off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | off | off | cross-off | cross-off | off |
High Tide | 4:34AM1.36m | 6:18AM1.35m | 7:41AM1.41m | 11:17PM1.08m | 8:38AM1.49m | 11:10PM1.12m | 9:22AM1.57m | 11:15PM1.19m | 10:01AM1.62m | 11:27PM1.27m | ||||||||||
Low Tide | 2:36PM0.47m | 3:21PM0.37m | 3:53PM0.29m | 2:37AM1.00m | 4:20PM0.23m | 3:25AM0.91m | 4:44PM0.20m | 4:03AM0.82m | 5:07PM0.20m | 4:38AM0.72m | ||||||||||
 |  | | | | | |  |  | | | | | | | | | | | | |
 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — |
 | 6:12 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 24 | 26 | 27 | 24 | 26 | 27 | 24 | 27 | 28 | 24 | 27 | 27 | 25 | 26 | 27 | 24 | 26 | 27 | 24 |
Feels °C | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 26 | 28 | 28 | 25 | 29 | 28 | 27 | 28 | 29 | 26 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 14 | SSW 15 | SW 16 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SW 16 | SSW 12 | SSW 18 |
| kJ | 3110 | 2567 | 2503 | 2151 | 1809 | 1937 | 1488 | 1261 | 1856 | 1608 | 1057 | 1206 | 1449 | 1319 | 1127 | 777 | 462 | 729 | 558 | 4057 |
Swell 2 Height (m) Direction Period (s) | — | SE 6 | SE 7 | SE 6 | SE 5 | SE 6 | SSW 19 | SSW 18 | SE 6 | SW 20 | SW 18 | SE 6 | SSE 6 | — | — | SSW 8 | SSW 13 | SW 12 | SW 15 | — |
| kJ | — | 34 | 43 | 32 | 30 | 26 | 1147 | 964 | 33 | 97 | 199 | 49 | 55 | — | — | 36 | 282 | 282 | 649 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 26 | SSW 23 | — | — | — | — | — | — | — | — | — | — | SSW 20 | SW 17 | SW 22 | SW 20 | — |
| kJ | — | — | — | 13 | 54 | — | — | — | — | — | — | — | — | — | — | 75 | 429 | 237 | 945 | — |
Wind waves Height (m) Direction Period (s) | SE 6 | ESE 6 | ESE 6 | SE 6 | SE 6 | SE 6 | SE 5 | SE 5 | ESE 6 | SE 5 | SE 5 | ESE 6 | SE 6 | SE 5 | ESE 5 | SE 5 | SE 4 | SSE 5 | SE 4 | SE 5 |
| kJ | 58 | 99 | 145 | 75 | 77 | 83 | 42 | 27 | 116 | 55 | 39 | 170 | 154 | 57 | 54 | 20 | 29 | 26 | 20 | 49 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 145 | 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.
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