
Surf Forecasts:
Downtowns surf forecast from 11 Sep 2026:
- Best quality surf: Friday 11 Sep, 8PM (local time) - 6ft (1.9m), 15s period, SW swell with offshore winds.
- Most powerful swell: Sunday 13 Sep, 2PM (local time) - 7ft (2.2m), 18s period, SW swell with 2,921 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 8PM (local time) - 6ft (1.9m), 15s period with SW swell.
Best Forecast Surf Conditions for Downtowns this week:
The surf forecast for Downtowns over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 11) at 8PM. The primary swell is predicted to be 1.9m and 15s period with a secondary swell of 0.6m and 5s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Downtowns in the next 16 days are 2.2m 18s and forecast to arrive on Sunday (Sep 13) at 2PM. 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 Monday (Sep 14) at 5PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Fri 11th Sep) | 6ft (1.9m) 15s |
| Best Surf | 8PM (Fri 11th Sep) | 6ft (1.9m) 15s |
| Most Powerful | 2PM (Sun 13th Sep) | 7ft (2.2m) 18s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the charts for the next couple weeks. We’ve got a real solid run building for the experienced crew at Downtowns. This a reef break, fairly exposed to the swell, and it’s picking up a solid southwest groundswell. The water temp is sitting at 80°, which is about average for this time of year, so no surprises there. Let’s break it down.
The first real action kicks off on Friday the 11th. That afternoon we’re seeing some clouds, but the wind is glassy out of the southeast at just 3 mph. Swell is a clean 6 ft from the SW with a long 16-second period. The combined energy is a solid 1919 (moderate energy) – this is the kind of setup that has proper shape and power, but with those longer gaps between sets. For a reef, that’s a treat. This is excellent for experienced surfers. Clean and glassy.
Saturday morning the 12th is a bit more marginal with some cross-onshore wind, but the swell holds at 5 ft with a 15-second period. The afternoon cleans right up again with offshore wind and 5 ft swell (1316 energy). Not a standout, but still very good.
Sunday the 13th is where it gets interesting. By the afternoon, the swell jumps to 7 ft from the SW, period 17 seconds, and the energy climbs to 2859 (moderate to strong). The wind is cross-offshore from the east at 6 mph. This is excellent surf for experienced surfers – big, powerful, and clean. This is one of the true standouts of the whole run.
Monday the 14th holds excellent afternoon conditions again: 6 ft swell, 16-second period, east wind, clean. Energy at 1577.
Tuesday the 15th afternoon is another glassy gem: 6 ft, 15-second period, southeast wind at 3 mph. Feels glassy. Energy at 1478.
Wednesday the 16th keeps the glassy streak going all day. Morning and afternoon both glassy with 6-6 ft swell and 15-second period. Energy around 1300-1388. Clean, clean, clean.
Thursday the 17th afternoon is glassy again with 6 ft swell, 14-second period, energy 1457. Excellent conditions.
Now, we hit a bit of a lull. Friday the 18th through Saturday the 19th the swell drops below 5 ft and winds turn cross-onshore. Not a great window. But then, Sunday the 20th brings a punch: 8 ft swell from the SW with a 17-second period in the morning, energy hitting 2913 (strong). The wind is cross-onshore, so it’s a bit bumpy, but that’s a lot of power. Still, for the experienced, it’s worth a look.
Monday the 21st afternoon cleans up with glassy conditions and 6 ft swell (1289 energy). Good.
Then, another standout window appears. Wednesday the 23rd afternoon: glassy, 7 ft from the SSW, 16-second period, energy 2506 (strong to very strong). This is excellent for the experts. The following Thursday the 24th afternoon is also glassy with 6 ft and 15-second period (1463 energy).
We finish out the run on Saturday the 26th. The morning is glassy with a 4 ft swell, but check the period: 19 seconds. That’s a very long period groundswell. Energy is 1490, but that long period will make it wrap beautifully around the reef, though it might break a bit too straight for a beach – no worries here, it’s a reef. Excellent conditions again for the experienced.
The only true standouts across the whole 16 days are the afternoons of Sunday the 13th and Wednesday the 23rd. Both have that big, powerful SW groundswell, clean winds, and high energy. Crowds can come and go at Downtowns, so you might have company, but with surf this good, it’s worth it.
This is Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 28°C on Sun afternoon, min 23°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 14 | SW 14 |
Wave Graph | ||||||||||||||||||||
1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1513 | 1418 | 1540 | 1455 | 1474 | 1237 | 1358 | 1576 | 1533 | 1427 | 1231 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | cross-on | cross-off | off | cross | cross-off | off | cross | cross-off | cross-off | cross | glassy | off | glassy | glassy | cross-off | cross | glassy | glassy |
High Tide | 11:18PM1.51m | 11:20AM1.58m | 11:40PM1.60m | 11:59AM1.47m | 00:02AM1.65m | 12:37PM1.33m | 00:25AM1.66m | 1:14PM1.18m | 00:48AM1.64m | 1:52PM1.03m | 1:12AM1.59m | 2:37PM0.90m | 1:38AM1.51m | |||||||
Low Tide | 5:07PM0.28m | 5:15AM0.43m | 5:30PM0.37m | 5:55AM0.35m | 5:52PM0.46m | 6:34AM0.30m | 6:11PM0.56m | 7:13AM0.31m | 6:26PM0.64m | 7:53AM0.35m | 6:36PM0.71m | 8:38AM0.43m | 6:33PM0.77m | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | |
6:09 | — | — | 6:09 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 27 | 27 | 25 | 27 | 28 | 25 | 27 | 28 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 28 | 25 |
Feels °C | 28 | 29 | 30 | 29 | 28 | 29 | 30 | 28 | 29 | 30 | 27 | 27 | 28 | 27 | 30 | 29 | 28 | 29 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 14 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 14 | SW 14 |
1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1513 | 1418 | 1540 | 1455 | 1474 | 1237 | 1358 | 1576 | 1533 | 1427 | 1231 | |
Swell 2 Height (m) Direction Period (s) | SW 24 | SSE 5 | SW 21 | SE 6 | SSW 14 | SW 15 | SE 6 | SE 6 | SE 7 | SE 6 | SSE 5 | SSE 6 | SE 6 | — | SSE 5 | SE 5 | — | SE 6 | SE 5 | SSE 5 |
143 | 17 | 763 | 38 | 742 | 614 | 36 | 33 | 54 | 64 | 26 | 22 | 15 | — | 25 | 30 | — | 42 | 30 | 17 | |
Swell 3 Height (m) Direction Period (s) | — | SW 24 | SE 6 | SW 21 | — | SE 7 | — | — | — | — | — | — | SSW 5 | — | SSW 21 | — | — | — | — | — |
— | 197 | 26 | 445 | — | 36 | — | — | — | — | — | — | 8 | — | 45 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | SE 6 | SE 6 | SE 6 | SE 7 | SE 5 | SE 6 | ESE 7 | SE 6 | SE 6 | ESE 6 | SE 6 | SSE 5 | SE 5 | SE 6 | SE 5 | SE 6 | SE 6 | SE 5 |
23 | 39 | 68 | 95 | 59 | 100 | 115 | 83 | 150 | 159 | 61 | 65 | 59 | 33 | 74 | 67 | 28 | 120 | 88 | 39 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 |
Best forecast wave conditions in Sumbawa | ||||||||||||||||||||
Best forecast wave conditions in Indonesia | ||||||||||||||||||||
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Information about the Downtowns Surf forecast
The above surf forecast table for Downtowns provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Downtowns can be found by selecting the local surf guide option on the grey menu. Our Downtowns 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 (Downtowns) 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 Downtowns 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.
Downtowns is 57 km (35 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.










