
Surf Forecasts:
Downtowns surf forecast from 14 Sep 2026:
- Best quality surf: Monday 14 Sep, 5PM (local time) - 6ft (1.8m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 8PM (local time) - 7ft (2.1m), 16s period, SW swell with 2,212 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 5PM (local time) - 6ft (1.8m), 16s 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 Monday (Sep 14) at 5PM. The primary swell is predicted to be 1.8m and 16s period with a secondary swell of 0.9m and 6s. 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 2.1m 16s and forecast to arrive on Sunday (Sep 20) at 8PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Monday (Sep 14) at 5PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 14th Sep) | 6ft (1.8m) 16s |
| Best Surf | 5PM (Mon 14th Sep) | 6ft (1.8m) 16s |
| Most Powerful | 8PM (Sun 20th Sep) | 7ft (2.1m) 16s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright, let’s switch over to feet and miles per hour, same story.
It’s a proper solid run coming our way, with some genuine pulse in the water.
The first action kicks off Monday morning, September 14, and honestly, there’s no flat spell to complain about. The whole stretch has regular swell, so don’t put the board away.
Downtowns is the spot. This is a fairly consistent, advanced reef break that’s fairly exposed to the SW swell, and it’s pulling in a clean, long-period groundswell all week. On Monday morning, September 14, you’ve got 6 ft of SW swell at a very long 16 seconds, with glassy conditions and a slight SSE air. Water temp is 80°, which is about normal for this time of year – no weird anomalies here. The combined wave energy is moderate at 1700. That morning is the standout of the first week: clean, powerful, and well-shaped on that reef. The afternoon holds up good too with a cross-off breeze.
Through Tuesday, September 15, the swell holds around 6–6 ft from the SW, but the wind gets a little more cross or cross-off. It’s still clean enough for a session, but not as pristine as Monday morning.
Wednesday, September 16, is a bit messier with some cross-onshore chop and lower scores, and the period drops to 14 seconds. Still surfable, but not the pick of the week.
Now, Thursday morning, September 17, the swell kicks up to a solid 7 ft from the SSW at 14 seconds, and it’s glass again. That’s a beauty – powerful, clean, and just under the “too big for beginners” threshold.
Saturday afternoon, September 19, the swell drops to 4 ft but goes glassy again. A fun small-wave option if you’ve got a grovel board.
Then Sunday the 20th – that afternoon is a real highlight. 7 ft of SW swell at 16 seconds, glassy conditions, and the energy reading is 2151 (moderate to strong). That’s a proper clean, heavy reef day for experienced surfers.
Monday the 21st afternoon is another glassy one at 6 ft, and Friday the 25th is just okay – nothing special.
Now, looking into the second week, there’s some serious muscle on the charts. Saturday, September 26 afternoon: glassy, 7 ft SSW, moderate energy. Good, but keep an eye on Sunday, September 27. That’s the big one – morning shows 8 ft SSW swell at a very long 20-second period, and afternoon pushes to 10 ft at 19 seconds. This is big (over 8 ft) so it’s experts only. The combined energy readings hit 7379 and 7293 – that’s strong to very strong wave energy. But there’s a caveat: wind is light cross-onshore both sessions. Still, a very long period SSW groundswell at that size on a reef will be a serious, powerful performance wave.
Monday, September 28 keeps it big with 10 ft and 8 ft, but the wind turns cross and picks up to 9 mph, so it’s not as clean. Tuesday the 29th drops back to around 6–6 ft.
One more thing: from about Saturday the 26th through Monday the 28th, that swell is well overhead and pushing hard. For a beach break setup, it might start looking more interesting for kite surfing than paddle surfing, but Downtowns is a reef, so it handles those big, long-period lines well.
If you’re picking your sessions, my top call is Monday morning, September 14 – glassy, 6 ft SW at 16 seconds, clean, and the water is a comfortable 80°. Second standout is Sunday afternoon, September 20 for that same clean power, and the long-range standout is Sunday, September 27 – that’s a big, powerful SSW groundswell but the wind might be just light cross-onshore, so it’s promising but less certain that far out.
Crowds at Downtowns can be an issue – it’s listed as “sometimes” busy, so get there early if you can.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 14 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 18 | SW 16 | SW 16 | SW 16 |
Wave Graph | |||||||||||||||||||||
1634 | 1513 | 1418 | 1540 | 1349 | 1474 | 1237 | 1220 | 1693 | 1604 | 1447 | 1314 | 920 | 845 | 752 | 597 | 597 | 1087 | 2027 | 2087 | 2129 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross | cross-off | off | cross-on | cross | off | glassy | cross | glassy | cross-on | glassy | off | cross-on | glassy | off | cross-on | glassy | off |
High Tide | 12:37PM1.33m | 00:25AM1.66m | 1:14PM1.18m | 00:48AM1.64m | 1:52PM1.03m | 1:12AM1.59m | 2:37PM0.90m | 1:38AM1.51m | 2:08AM1.42m | 2:57AM1.32m | |||||||||||
Low Tide | 6:11PM0.56m | 7:13AM0.31m | 6:26PM0.64m | 7:53AM0.35m | 6:36PM0.71m | 8:38AM0.43m | 6:33PM0.77m | 9:40AM0.51m | 11:39AM0.56m | 1:51PM0.51m | |||||||||||
6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 27 | 26 | 26 | 27 | 25 |
Feels °C | 29 | 30 | 27 | 28 | 28 | 27 | 29 | 27 | 27 | 30 | 29 | 27 | 28 | 31 | 28 | 29 | 30 | 29 | 29 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 14 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 18 | SW 16 | SW 16 | SW 16 |
1634 | 1513 | 1418 | 1540 | 1349 | 1474 | 1237 | 1220 | 1693 | 1604 | 1447 | 1314 | 920 | 845 | 752 | 597 | 597 | 1087 | 2027 | 2087 | 2129 | |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 6 | — | SE 6 | — | SW 24 | SSE 6 | — | — | SE 6 | SE 6 | — | SE 6 | SE 6 | SW 20 | SW 18 | SW 19 | SW 13 | SE 6 | SE 6 | SE 6 |
66 | 47 | — | 16 | — | 22 | 28 | — | — | 23 | 21 | — | 19 | 11 | 99 | 208 | 347 | 336 | 10 | 18 | 14 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 21 | — | — | — | — | — | SW 22 | SW 21 | SE 5 | SE 5 | SE 5 | SE 6 | — | — | — |
— | — | — | — | — | — | 45 | — | — | — | — | — | 18 | 18 | 7 | 4 | 10 | 14 | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 6 | SE 6 | SSE 5 | S 5 | SE 5 | SSE 5 | SE 6 | SSE 5 | SE 5 | ESE 6 | SE 6 | SE 5 | ESE 6 | — | — | SE 5 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 |
196 | 118 | 24 | 7 | 55 | 23 | 71 | 34 | 49 | 80 | 64 | 39 | 60 | — | — | 23 | 32 | 40 | 31 | 46 | 40 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 4 | 0 | 0 | 4 | 4 | 0 | 0 | 4 | 0 | 4 | 0 | 0 | 20 | 0 | 0 | 4 | 0 | 0 |
Best forecast wave conditions in Sumbawa | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.










