
Surf Forecasts:
Downtowns surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 8PM (local time) - 7ft (2.1m), 15s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 11AM (local time) - 8ft (2.5m), 16s period, SSW swell with 3,336 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 8PM (local time) - 7ft (2.1m), 15s 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 Saturday (Sep 05) at 8PM. The primary swell is predicted to be 2.1m and 15s period. 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 1.1m 5s period and expected on Friday (Sep 11) at 11AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 5th Sep) | 7ft (2.1m) 15s |
| Best Surf | 8PM (Sat 5th Sep) | 7ft (2.1m) 15s |
| 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, it's Rusty here, your local surf reporter.
We've got a busy 16-day window on the cards with Downtowns. The pattern is consistent, with a solid, long-period SW groundswell running for most of the stretch. The key here is watching the wind, because while the swell is there a lot of the time, cross-shore breezes will keep the surface a bit lumpy. The standout moments are when that wind goes offshore or glassy, and we have a few of those.
Water temps at Downtowns are sitting at 80°, which is bang on average for this time of year, so no surprises there.
The first event kicks off on the afternoon of Saturday, September 5th. It's a bit messy with a 7ft SSW swell at 16 seconds, but it's a cross-shore wind so it's surfable, just not the pick. The combined energy is strong at (2186). Sunday morning is similar, but Sunday afternoon, September 6th, sees the wind shift to a cross-offshore from the SSE, which cleans it up nicely. Swell drops slightly to 5ft from the SSW, but that 16-second interval and 1944 energy means there's still plenty of push for an experienced surfer.
Monday the 7th and Tuesday the 8th are a bit of a mix. Monday has 7-7ft SSW swell and 14-second periods, but that cross-shore wind keeps it from being pristine. Tuesday morning actually cleans up with a very long-period SSW groundswell of 19 seconds at 5ft, but the energy is still significant (2752). The downside there is that for a beach break setup, a 19-second period can make the waves break a little too straight, so it's not as user-friendly. Tuesday afternoon picks up in size to 6ft and the period drops to 18 seconds, but it's cloudy and still cross-shore.
Now, the first real standout is Wednesday afternoon, September 9th. We have a solid 8ft SSW swell at 16 seconds, and although the wind is cross-shore, the raw power is there (2751). It's a big, powerful wave, over 8ft, so this is for the experienced crew only.
Through the rest of the first week, it's a consistent run of 5ft to 7ft SW swell, but mostly with that cross-shore wind holding the quality back. The next clear highlight is the afternoon of Friday, September 11th. The wind goes clean offshore from the ESE, and the 7ft SW swell at 16 seconds will be lined up beautifully. That’s a very good session for advanced surfers.
Moving into the second week, the consistency continues. The absolute best on offer hits on Sunday afternoon, September 13th. This is a beauty. The wind goes glassy, conditions will be perfect, with a 8ft SW swell and an 18-second period. The combined energy is massive at (3123). This will be a powerful, clean, long-period groundswell, perfect for the more experienced surfer, but watch out for the long waits between sets.
Monday the 14th morning is also glassy with a 6ft SW swell, which is a great follow-up, but the Sunday is the top pick. The rest of that week stays punchy, with clean afternoons on Tuesday the 15th and Wednesday the 16th. We also see glassy conditions on the morning of Friday the 18th (6ft SW, 16s) and the afternoon of Saturday the 19th (6ft SW, glassy).
We close out the window on Sunday the 20th. The morning is a bit messy, but the afternoon will be glassy with a clean, 7ft SW swell. A solid end to a solid run.
Overall, get ready for a long swell season here. It's consistent, but you have to pick the windows when the wind plays ball. The crowds at Downtowns are possible, so for those standout glassy sessions, expect some company.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 23°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 16 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 19 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SW 16 | SW 16 | SW 16 | SW 15 |
Wave Graph | ||||||||||||||||||||
2186 | 1247 | 1484 | 1199 | 2325 | 1724 | 1624 | 1110 | 1410 | 1901 | 2573 | 3336 | 2751 | 2423 | 1428 | 2318 | 2379 | 2093 | 1933 | 1506 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross-off | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross | cross | cross | cross | cross | cross-off | cross | off | off |
High Tide | 4:30AM1.52m | 6:28AM1.52m | 10:32PM1.09m | 7:56AM1.58m | 10:24PM1.17m | 9:00AM1.64m | 10:38PM1.28m | 9:52AM1.67m | 10:57PM1.40m | 10:38AM1.65m | 11:18PM1.51m | |||||||||
Low Tide | 2:05PM0.32m | 3:01PM0.23m | 1:30AM1.03m | 3:40PM0.17m | 2:56AM0.88m | 4:13PM0.17m | 3:49AM0.71m | 4:41PM0.20m | 4:34AM0.56m | 5:07PM0.28m | ||||||||||
— | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 25 | 26 | 26 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 24 | 27 | 26 | 25 | 27 | 27 | 25 |
Feels °C | 27 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 26 | 29 | 26 | 27 | 30 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SW 16 | SW 16 | SW 16 | SW 15 |
2186 | 1247 | 1484 | 1199 | 2325 | 1724 | 1624 | 1110 | 1342 | 1491 | 2573 | 3336 | 2751 | 2423 | 1428 | 2318 | 2379 | 2093 | 1933 | 1506 | |
Swell 2 Height (m) Direction Period (s) | — | SSW 17 | SSW 18 | SSW 13 | — | SW 23 | SW 22 | SW 21 | SSW 19 | SSW 18 | SSW 12 | — | — | — | SSW 18 | — | SW 26 | SE 5 | SW 24 | SE 5 |
— | 622 | 283 | 745 | — | 21 | 119 | 433 | 1410 | 1901 | 680 | — | — | — | 835 | — | 27 | 14 | 143 | 10 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 26 | — | SW 24 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 66 | — | 197 | |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | SE 4 | SSE 4 | — | — | — | — | — | — | SSE 5 | — | — | — | SE 4 | SE 4 | SE 4 | ESE 5 | SE 5 | ESE 5 |
23 | 17 | 17 | 27 | — | — | — | — | — | — | 17 | — | — | — | 15 | 16 | 11 | 59 | 30 | 28 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 147 | 0 | 4 | 0 | 0 | 147 | 176 | 0 | 176 | 147 | 0 | 176 | 147 | 4 | 4 | 147 | 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.










