Surf Forecasts:
Periscope Point surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 2PM (local time) - 4.5ft (1.4m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 11PM (local time) - 10ft (3.0m), 17s period, SSW swell with 4,701 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2PM (local time) - 4.5ft (1.4m), 16s 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 Tuesday (Aug 18) at 2PM. The primary swell is predicted to be 1.4m and 16s period with a secondary swell of 1.1m and 13s. 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 3.0m 17s and forecast to arrive on Wednesday (Aug 19) at 11PM. Winds are predicted to be 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+) | 2PM (Tue 18th Aug) | 4.5ft (1.4m) 16s |
| Best Surf | 2PM (Tue 18th Aug) | 4.5ft (1.4m) 16s |
| Most Powerful | 11PM (Wed 19th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Periscope Point over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s get straight into it. The big picture is a long stretch of consistent SW groundswell on the cards for Periscope Point (South Coast). For the first half of the outlook, it’s game on.
First up is Tuesday morning, August 18th. We’re looking at 4ft of SW swell with a long 16-second period, and the energy is moderate at 1844. It’s clean with a light ESE cross-off breeze, and the water’s about average for the season at 80°. Good place to start. The afternoon bumps it up to 6ft, with energy building to 2338.
Now, Wednesday and Thursday the 19th and 20th, are the ones to circle. Wednesday morning, we’ve got 8ft of SW swell with a massive 19-second period, and the energy is well into the strong range at 3604. This is a serious groundswell, and the light cross-off wind is going to have it looking perfect. The size stays up at 8ft through Wednesday afternoon and Thursday, with energy in the 4000s. That’s strong, powerful surf – definitely not one for the faint-hearted. This is expert territory only. The period is long, so there will be long, clean sets with good time between them.
From Friday the 21st through to Sunday the 24th, the size backs off a touch to 6ft to 8ft, but the energy stays solid. The mornings are the go, with light winds and clean conditions. Some of the afternoons get a bit of cross-shore wind and there’s a heads-up about tide, so pick your sessions.
The 25th and 26th see it ease more, with waves around 5ft to 6ft. The 27th drops off more, with 4ft to 4ft waves, but Thursday morning is still clean. Then we get another pulse on the 28th and 29th, with 5ft to 6ft surf and moderate energy.
There’s a bit of a lull on the 30th and 31st. Swell drops, the wind goes more southerly, and it gets a bit messy. Still surfable, but not the quality we saw earlier.
But don’t write it off. The 1st of September, Tuesday, brings a new pulse of SW groundswell. The morning has 7ft waves, building to 8ft in the afternoon, with energy back up over 3400. It’s a bit crossed up in the afternoon, but it’s sizeable. Then Wednesday, September 2nd, is a cracker. A solid 8ft of SW swell with a 16-second period and light cross-off winds from the SSE. That’s clean, powerful stuff. Again, that’s over the 8ft mark in the morning, so it’s all about the experts.
This is all happening at a reef, and with that long-period SW groundswell, it’s going to hold its shape much better than a beach break would. It is inconsistent, so be patient. The waves will be worth it. This is the window to be at Periscope Point.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Wed afternoon, min 22°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°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) | SW 16 | SW 16 | SW 16 | SW 19 | SSW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 15 | SSW 16 | SSW 16 |
Wave Graph | |||||||||||||||||||||
786 | 1672 | 1737 | 3604 | 4288 | 4484 | 3897 | 3376 | 2545 | 2102 | 3146 | 2727 | 2503 | 2550 | 1857 | 1571 | 1716 | 1261 | 1762 | 1721 | 1699 | |
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 | off | cross-off | cross-off | off | cross-off | cross | off | cross-off | cross-off | off |
High Tide | 1:23PM2.47m | 1:38AM2.82m | 1:54PM2.20m | 2:06AM2.64m | 2:24PM1.94m | 2:36AM2.43m | 3:00PM1.67m | 3:16AM2.22m | 4:44PM1.45m | 4:45AM2.03m | 10:07PM1.61m | 7:24AM2.06m | 9:45PM1.82m | ||||||||
Low Tide | 7:19PM0.55m | 8:02AM0.61m | 7:43PM0.75m | 8:39AM0.81m | 8:04PM0.96m | 9:26AM1.02m | 8:22PM1.18m | 10:48AM1.19m | 8:25PM1.38m | 2:10PM1.14m | 11:41PM1.60m | 3:08PM0.93m | 2:37AM1.45m | ||||||||
6:15 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | |
— | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 24 | 28 | 29 | 24 | 28 | 28 | 24 | 28 | 29 | 24 | 28 | 29 | 24 | 27 | 28 | 24 | 27 | 28 | 23 |
Feels °C | 29 | 28 | 27 | 29 | 30 | 27 | 30 | 29 | 26 | 29 | 29 | 26 | 29 | 29 | 27 | 28 | 28 | 26 | 28 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 19 | SSW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 15 | SSW 16 | SSW 16 |
786 | 1672 | 1737 | 3604 | 4288 | 4484 | 3897 | 3376 | 2545 | 2102 | 3146 | 2727 | 2503 | 2550 | 1857 | 1571 | 1716 | 1261 | 1762 | 1721 | 1699 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 21 | SW 20 | — | — | SE 7 | SE 7 | — | — | SSE 6 | W 19 | SE 7 | SE 6 | S 26 | SSW 24 | SSW 21 | SSW 20 | SSW 18 | SW 21 | SW 20 | SSE 5 |
400 | 658 | 881 | — | — | 57 | 89 | — | — | 12 | 7 | 114 | 46 | 13 | 54 | 256 | 790 | 835 | 72 | 188 | 19 | |
Swell 3 Height (m) Direction Period (s) | SW 21 | SE 6 | — | — | — | — | — | — | — | — | — | — | — | — | SSW 24 | SSW 21 | SSW 7 | SE 6 | SW 21 | E 5 | SW 18 |
658 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | 54 | 300 | 5 | 69 | 72 | 7 | 383 | |
Wind waves Height (m) Direction Period (s) | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 4 | ESE 7 | — | SE 4 | SE 6 | SE 6 | SE 4 | ESE 6 | — | SE 6 | SE 6 | SE 5 | SE 4 | — | ESE 5 | SE 5 | E 6 |
46 | 25 | 17 | 28 | 25 | 81 | — | 27 | 94 | 39 | 34 | 127 | — | 31 | 36 | 27 | 29 | — | 42 | 23 | 16 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 172 | 0 | 0 | 172 | 0 | 0 | 0 | 0 | 0 | 172 | 0 | 0 | 0 | 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











