
Surf Forecasts:
Downtowns surf forecast from 8 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 11PM (local time) - 6.5ft (2.0m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 11AM (local time) - 8ft (2.5m), 16s period, SSW swell with 3,113 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 11PM (local time) - 6.5ft (2.0m), 17s period with SSW 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 Tuesday (Sep 08) at 11PM. The primary swell is predicted to be 2.0m and 17s period with a secondary swell of 2.1m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Downtowns in the next 16 days are 2.5m 16s and forecast to arrive on Wednesday (Sep 09) at 11AM. Winds are predicted to be cross-shore 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+) | 11PM (Tue 8th Sep) | 6.5ft (2.0m) 17s |
| Best Surf | 11PM (Tue 8th Sep) | 6.5ft (2.0m) 17s |
| Most Powerful | 11AM (Wed 9th Sep) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into the setup for the next couple of weeks.
We’ve got a solid run of groundswells on the way, with a big pulse of energy hitting toward the end of the period. The focus is on one spot that’s going to see a lot of action: Downtowns. This is a reef break, fairly exposed to the SW swell, and it’s setup for some serious waves. The water temp is sitting at 80°F, which is about average for the time of year. Nothing freaky there.
The first decent surf kicks off Tuesday afternoon, the 8th of September. Swell is already up to 6ft from the SSW with a very long period of 18 seconds. That’s some serious groundswell energy, and the combined energy is cranking at 3202. Wind is a light cross-off from the SSE, so it’s clean. This is excellent surf, but at 6ft on a reef with that long period, it’s one for the experienced crew only. The long period means the waves will be well-shaped and powerful, but the sets will be a bit more spaced out. This is a good sign.
Wednesday the 9th through Friday the 11th stays solid, with swell holding around 6ft to 8ft from the SSW. The wind gets a bit more cross than we’d like during the mornings, but the afternoons clean up nicely. Friday afternoon (11th) is a standout: the wind swings offshore from the ESE, the swell is 6ft from the SW with a 16-second period, and the energy is still strong at 1919. The water is clean. This is a beautiful window for an experienced surfer.
But the real highlight is the weekend. Saturday the 12th morning is a dream – glassy conditions, 5ft of SW swell, and a 15-second period. The energy is 1731. That’s as good as it gets for a clean, powerful wave without it being too heavy. Then Sunday the 13th afternoon brings another standout: 7ft from the SW, 17 seconds, and offshore wind from the east. The energy jumps to 2823. That’s a proper session.
The following week keeps the momentum. Monday the 14th afternoon, Tuesday the 15th afternoon, and Wednesday the 16th morning all have glassy or offshore conditions with solid 6ft to 6ft SW swell. The energy is still in the 1500 to 2000 range. Good, clean, powerful surf for the experienced.
Then we get the big one. On Tuesday the 22nd of September, the swell absolutely lights up. Morning sees 10ft from the SSW with an 18-second period, and the energy is a massive 6488. The wind is a clean cross-off from the SSE. This is huge, powerful, and only for experts. The afternoon is even bigger at 12ft (energy 6567). This is a serious swell event. Wednesday the 23rd holds at 10ft with glassy conditions in the afternoon. If you’re an advanced surfer, this is the week to be at Downtowns. The crowds are mentioned as “sometimes” here, so expect a few others with the same idea, especially for those standout sessions.
The run is strong. There are no real gaps of dead days here, just a steady flow of clean, powerful groundswell. The first week is excellent, the second week is epic. If you’re not an experienced surfer, the days with swell under 5ft, like the 18th and 19th, are your best bet for something a bit more manageable.
Stay stoked, Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 23°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Fri afternoon, min 23°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 18 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 |
Wave Graph | ||||||||||||||||||||
1901 | 2573 | 3113 | 2663 | 2295 | 1279 | 2376 | 2084 | 1799 | 1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1494 | 1456 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | cross-off | cross | cross | off | cross | off | off | glassy | cross-off | off | cross | off | cross-off | cross | off | cross-off |
High Tide | 10:24PM1.17m | 9:00AM1.64m | 10:38PM1.28m | 9:52AM1.67m | 10:57PM1.40m | 10:38AM1.65m | 11:18PM1.51m | 11:20AM1.58m | 11:40PM1.60m | 11:59AM1.47m | 00:02AM1.65m | 12:37PM1.33m | 00:25AM1.66m | |||||||
Low Tide | 3:40PM0.17m | 2:56AM0.88m | 4:13PM0.17m | 3:49AM0.71m | 4:41PM0.20m | 4:34AM0.56m | 5:07PM0.28m | 5:15AM0.43m | 5:30PM0.37m | 5:55AM0.35m | 5:52PM0.46m | 6:34AM0.30m | 6:11PM0.56m | |||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:08 | — | — | 6:08 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 27 | 28 | 25 | 27 | 28 | 25 | 27 | 28 | 25 | 27 | 28 | 25 |
Feels °C | 27 | 27 | 27 | 27 | 27 | 29 | 28 | 27 | 29 | 29 | 27 | 30 | 31 | 28 | 29 | 29 | 27 | 29 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 |
1301 | 2573 | 3113 | 2663 | 2295 | 1279 | 2376 | 2084 | 1799 | 1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1494 | 1456 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 12 | — | — | — | SSW 18 | — | SW 26 | SSW 26 | SW 24 | SW 24 | SW 21 | SE 6 | SSW 14 | SW 15 | — | SE 6 | SE 6 | SE 6 | SSE 6 |
1901 | 811 | — | — | — | 845 | — | 27 | 66 | 143 | 197 | 763 | 38 | 845 | 767 | — | 47 | 59 | 64 | 34 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SE 6 | SW 21 | SE 6 | SE 7 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 28 | 445 | 52 | 36 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | S 5 | — | SSE 5 | SSE 4 | SE 4 | SSE 4 | SE 4 | SE 4 | SE 5 | SE 5 | SE 5 | ESE 6 | SE 6 | — | SE 7 | SE 6 | SE 6 | SE 7 | SE 6 | SE 6 |
21 | — | 24 | 21 | 16 | 13 | 16 | 11 | 10 | 31 | 18 | 99 | 95 | — | 114 | 64 | 122 | 158 | 165 | 67 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 4 | 4 | 0 | 4 | 4 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 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.










