
Surf Forecasts:
Downtowns surf forecast from 11 Sep 2026:
- Best quality surf: Friday 11 Sep, 5PM (local time) - 6ft (1.9m), 16s period, SW swell with glassy 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, 5PM (local time) - 6ft (1.9m), 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 Friday (Sep 11) at 5PM. The primary swell is predicted to be 1.9m and 16s period with a secondary swell of 0.4m and 24s. The wind is predicted to be glassy 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 1.7m 6s period and expected on Monday (Sep 14) at 5PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Fri 11th Sep) | 6ft (1.9m) 16s |
| Best Surf | 5PM (Fri 11th Sep) | 6ft (1.9m) 16s |
| 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, folks, Rusty here. Let's cut through the static and look at what's on the table.
Overall, we've got a promising run of swell from the SW direction through most of the window, and the big story is that the winds are looking clean for a lot of it. The water temp is sitting at 80°F, which is pretty much spot on for this time of year.
Downtowns is the only spot on the books, a reef setup that handles a SW swell well. The real magic starts to build on Friday afternoon, September 11th. That afternoon, the wind turns glassy, and we've got a solid 6ft SW groundswell with a period that stretches out to 16 seconds. The energy is moderate (1919), but that combo of glassy conditions and a long-period SW swell is a proper draw. For an advanced surfer, that’s a session to circle.
The swell keeps rolling through the weekend. Sunday afternoon, September 13th, looks like the real standout. You've got a 7ft SW swell, a 17-second period, the wind goes glassy again, and the energy jumps up to a strong 2869. This is clean, powerful, lined-up reef surf. For experienced folks, that’s about as good as a forecast gets.
The pattern holds into the week. Monday afternoon, September 21st, sees another sweet setup: 6ft SW swell, 14-second period, and glassy wind again (1637 energy). Then we get another notable pulse. Tuesday, September 22nd, the afternoon session looks prime with a 8ft SSW swell, a 16-second period, and glassy conditions. The energy is very strong at 2787. That’s a lot of water moving.
Further out, towards the end of the month, there are some big numbers on the board. Saturday, September 26th, has a 8ft SSW swell with an 18-second period. The wind is glassy in the afternoon, and the wave energy hits a massive 3032. That is a very powerful, long-period groundswell. For this reef, that should be a sight to see, but only for those with experience.
I should mention that on the 25th, we see a SW swell with a 21-second period. That is a very, very long period, so the sets will be widely spaced but packing a punch. It will be best for this reef setup, not for a fickle beach break.
A few mornings here and there have some cross or cross-onshore wind, but the consistent afternoon glass-off windows are the real story. If you’re surfing this spot, you want the afternoon sessions. This is a break that can get crowded, so get out there early for the cleanest ones.
For the first week, the call is solid. The second week’s standouts on the 22nd and 26th are promising, but we’ll keep an eye on the details as they get closer.
Stay frothy.
- Rusty
Short Range ForecastMostly dry. Warm (max 28°C on Sun afternoon, min 23°C on Sat 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 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 14 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 15 | SSW 14 | SSW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
1799 | 1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1513 | 1418 | 1540 | 1455 | 1474 | 1237 | 1340 | 1488 | 1447 | 1427 | 1285 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | off | cross-on | glassy | off | glassy | glassy | off | cross | off | off | cross-on | cross-off | cross-off | glassy | glassy | cross-off | cross | cross | glassy |
High Tide | 10:38AM1.65m | 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 | ||||||||
6:09 | — | — | 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 | 27 | 26 | 27 | 27 | 25 | 27 | 28 | 25 | 27 | 28 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 |
Feels °C | 29 | 29 | 29 | 30 | 29 | 28 | 29 | 30 | 28 | 29 | 30 | 27 | 28 | 29 | 28 | 30 | 28 | 28 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 16 | 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 14 | SSW 15 | SSW 14 | SSW 14 | SW 14 |
1799 | 1776 | 1289 | 940 | 833 | 1935 | 1809 | 2823 | 2166 | 1764 | 1513 | 1418 | 1540 | 1455 | 1474 | 1237 | 1340 | 1488 | 1447 | 1427 | 1285 | |
Swell 2 Height (m) Direction Period (s) | SE 4 | SW 24 | SSE 5 | SW 21 | SE 6 | SSW 14 | SW 15 | SE 6 | — | SE 7 | SE 6 | SE 5 | S 5 | SE 6 | — | SSE 5 | SSE 5 | — | SE 6 | SE 6 | SE 5 |
10 | 143 | 17 | 763 | 38 | 845 | 614 | 46 | — | 52 | 64 | 10 | 8 | 15 | — | 21 | 37 | — | 47 | 32 | 13 | |
Swell 3 Height (m) Direction Period (s) | SSW 26 | — | SW 24 | SE 6 | SW 21 | — | SE 7 | — | — | — | — | S 5 | SE 6 | SSW 5 | — | SSW 21 | — | — | SSW 18 | — | — |
66 | — | 197 | 21 | 445 | — | 37 | — | — | — | — | 7 | 9 | 8 | — | 45 | — | — | 216 | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 4 | SE 5 | ESE 5 | ESE 6 | SE 6 | SE 6 | ESE 7 | SE 6 | SE 6 | ESE 7 | ESE 6 | SE 5 | ESE 6 | ESE 6 | SSE 5 | SE 6 | SE 5 | SE 5 | SE 6 | SE 6 | SE 5 |
35 | 23 | 47 | 63 | 95 | 61 | 123 | 138 | 33 | 150 | 176 | 57 | 56 | 47 | 30 | 50 | 74 | 28 | 116 | 83 | 39 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 4 | 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.










