Surf Forecasts:
Periscope Point surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 11AM (local time) - 7ft (2.2m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 8AM (local time) - 8ft (2.5m), 18s period, SW swell with 3,999 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 11AM (local time) - 7ft (2.2m), 15s period with SW swell.
Best Forecast Surf Conditions for Periscope Point this week:
The surf forecast for Periscope Point over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 11AM. The primary swell is predicted to be 2.2m and 15s period with a secondary swell of 0.3m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Periscope Point in the next 16 days are 2.5m 18s and forecast to arrive on Friday (Aug 28) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Saturday (Aug 22) at 2AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Fri 21st Aug) | 7ft (2.2m) 15s |
| Best Surf | 11AM (Fri 21st Aug) | 7ft (2.2m) 15s |
| Most Powerful | 8AM (Fri 28th Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Periscope Point over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming up.
Periscope Point is the only show in town for this outlook, and it’s a reef setup that’s sheltered and picks up swell from the south. The water’s sitting at 80° – pretty much bang on average for this time of year, so no surprises there.
We’ve got a solid run of surf kicking off Friday morning, August 21st. The swell is a clean 7ft from the SW with a very long period of 15 seconds – that’s proper groundswell and the energy is moderate to strong (2269). The wind is a gentle cross-off breeze at 9 mph, keeping things tidy. This is excellent surf, but it’s only for experienced surfers – at 7ft, it’s too big for beginners. Because it’s an inconsistent spot, when it fires, it’s a real treat. The long period means the waves will be well-shaped and powerful, but at a reef, be prepared for some serious lines. This is the standout of the whole window.
That quality holds through the weekend. Saturday the 22nd is just as good: 8ft SW swell, period 16 seconds, cross-off wind, and the energy is still strong (2563). Sunday the 23rd backs off a fraction to 7ft but stays clean. The morning might have a few clouds, but the wind stays cross-off.
Monday the 24th is still surfable at 7ft, but the afternoon turns a bit cross-shore with slight chop – still decent, but not as clean. By Tuesday the 25th, the swell drops to 5ft in the morning, so it’s smaller but still clean. The energy drops to moderate (1130). The rest of that week keeps the waves in the 4ft to 6ft range, with clean conditions most of the time, though the odd afternoon gets a bit of cross-chop.
Then we get a real spike on Friday the 28th of August. Morning sees 8ft from the SW, period 17 seconds, and energy is very strong (3882). That’s big, powerful, and still only for the experienced crew. Wind is cross-off, so it’s clean. The afternoon gets a bit of cross-chop again, but the morning is a ripper.
The last few days of August and into September keep the swell in the 5ft to 8ft range, with the energy staying strong. The real highlight is September 1st – Tuesday morning is 5ft, but the afternoon jumps to 8ft SW with a 19-second period and energy of 3746. That’s a very long period groundswell, and with light cross-off wind, it’s going to be absolutely stunning. If you can wait, that afternoon session is a corker.
September 2nd is another cracker – 8ft SW, 17 seconds, and energy of 3997. Very strong. Again, experts only.
The window wraps up with a beautiful glassy morning on September 5th – 4ft, 19-second period, and the wind is dead calm. That’s a glassy, clean, long-period swell that will be a dream on the reef. The energy is still strong (2001). A perfect way to end the run.
Overall, the top pick is the opening Friday morning, August 21st, for that first blast of long-period, clean, powerful swell. The second standout is the afternoon of September 1st for the combination of very long period and light wind.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Fri morning, min 21°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 15 | SW 17 | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 16 | SW 15 | SSW 14 | SW 16 | SSW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 16 | SW 18 |
Wave Graph | |||||||||||||||||||||
2263 | 3146 | 2727 | 2503 | 2550 | 2088 | 1809 | 1648 | 1488 | 2069 | 1699 | 1434 | 763 | 1591 | 1174 | 1016 | 1080 | 1002 | 486 | 739 | 3442 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 3:00PM1.67m | 3:16AM2.22m | 4:44PM1.45m | 4:45AM2.03m | 10:07PM1.61m | 7:24AM2.06m | 9:45PM1.82m | 8:37AM2.25m | 10:01PM2.03m | 9:21AM2.46m | 10:20PM2.25m | 9:55AM2.64m | 10:40PM2.46m | ||||||||
Low Tide | 9:26AM1.02m | 8:22PM1.18m | 10:48AM1.19m | 8:25PM1.38m | 2:10PM1.14m | 11:41PM1.60m | 3:08PM0.93m | 2:37AM1.45m | 3:38PM0.72m | 3:22AM1.23m | 4:03PM0.54m | 3:55AM1.00m | 4:26PM0.39m | 4:25AM0.79m | |||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 28 | 28 | 24 | 27 | 28 | 23 | 27 | 28 | 24 | 27 | 28 | 24 | 27 | 28 | 24 | 28 | 28 | 24 | 27 | 28 | 24 |
Feels °C | 29 | 28 | 26 | 28 | 28 | 25 | 28 | 28 | 27 | 28 | 28 | 26 | 28 | 28 | 26 | 30 | 28 | 27 | 28 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 17 | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 16 | SW 15 | SSW 14 | SW 16 | SSW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 16 | SW 18 |
2263 | 3146 | 2727 | 2503 | 2550 | 2088 | 1809 | 1648 | 1488 | 2069 | 1699 | 1434 | 763 | 1591 | 1174 | 1016 | 1080 | 1002 | 486 | 739 | 3442 | |
Swell 2 Height (m) Direction Period (s) | SSE 6 | — | SSE 7 | ESE 5 | S 26 | SSW 24 | SSW 21 | SSW 19 | SSW 18 | SSE 5 | SW 20 | SE 5 | SW 17 | E 5 | SSE 5 | S 5 | ESE 4 | SW 24 | SW 16 | SW 12 | SSE 4 |
6 | — | 56 | 33 | 13 | 54 | 297 | 993 | 835 | 17 | 97 | 47 | 354 | 12 | 33 | 8 | 6 | 22 | 322 | 330 | 21 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SSW 24 | — | — | SE 6 | ESE 5 | — | E 6 | S 5 | — | E 6 | E 5 | — | SW 24 | S 7 | SW 21 | — |
— | — | — | — | — | 54 | — | — | 44 | 8 | — | 16 | 13 | — | 24 | 13 | — | 22 | 27 | 454 | — | |
Wind waves Height (m) Direction Period (s) | ESE 4 | SE 5 | ESE 6 | — | — | SE 6 | SE 5 | — | ESE 5 | — | SSE 5 | — | SE 5 | S 5 | SE 6 | SE 5 | ESE 5 | SSE 4 | — | SE 4 | SSE 4 |
30 | 31 | 111 | — | — | 31 | 25 | — | 46 | — | 20 | — | 39 | 11 | 59 | 31 | 8 | 26 | — | 5 | 24 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 179 | 2 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
Best forecast wave conditions in Sumbawa | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
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Information about the Periscope Point Surf forecast
The above surf forecast table for Periscope Point provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Periscope Point can be found by selecting the local surf guide option on the grey menu. Our Periscope Point 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 (Periscope Point) 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 Periscope Point 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 Sumbawa? If you are looking for accommodation near Periscope Point, camping, hotels and holiday cottages in Sumbawa, consider staying in Bima which is 52 km (32 miles) away. Alternatively, find information about places to stay and car hire in Raba which is 56 km (35 miles) away











