Surf Forecasts:
Downtowns surf forecast from 29 Aug 2026:
- Best quality surf: Monday 31 Aug, 5PM (local time) - 5ft (1.6m), 18s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 8AM (local time) - 7ft (2.1m), 18s period, SW swell with 2,660 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 8AM (local time) - 4.5ft (1.4m), 13s 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 Sunday (Aug 30) at 8AM. The primary swell is predicted to be 1.4m and 13s period with a secondary swell of 0.6m and 5s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Downtowns in the next 16 days are 2.1m 18s and forecast to arrive on Tuesday (Sep 01) at 8AM. 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 (Aug 31) at 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 30th Aug) | 4.5ft (1.4m) 13s |
| Best Surf | 5PM (Mon 31st Aug) | 5ft (1.6m) 18s |
| Most Powerful | 8AM (Tue 1st Sep) | 7ft (2.1m) 18s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the menu for the next couple of weeks.
We’ve got a solid run of swell coming through, with the standout being a long-period groundswell that builds right into the start of the month. The first real action kicks off Sunday the 30th of August and it’s looking like a proper treat.
The whole period is centred on one spot, Downtowns, a reef break that’s fairly consistent and exposed to the SW. It’s an advanced wave, so not one for the beginners. The water temperature is about average for this time of year, so no surprises there.
Sunday the 30th is the real gem. The morning starts with a clean 5ft SW swell at a nice 13-second period, with glassy conditions and barely a breath of wind. The wave energy is moderate (971) and the surf is just about perfect. The afternoon holds the same quality, with the wind swinging light offshore from the ESE, keeping it glassy. This is the pick of the entire forecast. The swell direction is exactly what this break wants.
Monday the 31st, the swell pulses up. Morning is a bit messy with a cross-shore wind, but the afternoon turns it on – 5ft of SW swell at 18 seconds, a very long-period groundswell, with glassy conditions. The energy is strong (1795). This is a serious wave, but that long period might make it a bit too straight for a beach break; at a reef like Downtowns, it’s going to be chunky and powerful.
Tuesday the 1st of September gets bigger. The morning sees 7ft of SW swell at 18 seconds, with clean, light cross-offshore winds. The energy is very strong (2646). This is getting into expert-only territory. The afternoon holds similar size and quality with offshore winds.
Wednesday the 2nd stays chunky, with 7ft to 7ft SW swell, but the morning has a cross-shore breeze that messes the surface a bit. The afternoon cleans up nicely with cross-offshore winds.
From Thursday the 3rd, the swell starts to ease back, but there are still good windows. The afternoon of the 3rd gives you 5ft of SW swell with glassy conditions.
The second week gets a bit more mixed. The swell hangs around, but the wind is more often cross or cross-on. The 8th of September has a big spike in the afternoon – 7ft of SSW swell at a massive 19 seconds, with very strong energy (4259). The wind is cross-shore, so it won’t be perfect, but that’s a lot of water moving. The 9th is similar size and cross-shore winds.
The 10th of September afternoon shapes up nicely with 6ft of SSW swell and clean winds from the SE. The 11th and 12th also have clean afternoons with offshore winds and easing swell.
The 13th of September Sunday afternoon brings a clean 6ft SW swell with offshore winds from the east, a nice way to finish the 16-day window.
There are no gaps without surf; it’s a steady run of waves, but the quality is best on the first Sunday and Monday. Stick to the mornings and afternoons with offshore or glassy wind for the cleanest rides.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 22°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 13 | SW 13 | SW 19 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 14 | SSW 14 | SSW 14 |
Wave Graph | |||||||||||||||||||||
721 | 623 | 730 | 989 | 1501 | 2150 | 2611 | 2352 | 2592 | 2275 | 2053 | 1532 | 1281 | 1041 | 746 | 658 | 731 | 732 | 929 | 1240 | 1624 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | glassy | cross | glassy | cross-off | cross-off | cross-off | off | cross | cross-off | off | cross | off | cross-off | cross | cross-off | cross-off | cross | cross | cross-off |
High Tide | 11:49AM1.55m | 00:19AM1.52m | 12:26PM1.43m | 00:41AM1.59m | 1:06PM1.29m | 1:06AM1.63m | 1:50PM1.11m | 1:36AM1.65m | 2:48PM0.93m | 2:12AM1.63m | 4:58PM0.79m | 3:02AM1.57m | 4:30AM1.52m | ||||||||
Low Tide | 6:07PM0.37m | 6:27AM0.46m | 6:25PM0.46m | 7:08AM0.41m | 6:41PM0.55m | 7:54AM0.39m | 6:56PM0.64m | 8:50AM0.41m | 7:05PM0.72m | 10:09AM0.44m | 6:38PM0.78m | 12:17PM0.42m | |||||||||
6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | |
— | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:09 | — | — | 6:09 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 28 | 25 | 28 | 29 | 24 | 27 | 28 | 25 | 27 | 28 | 24 | 27 | 27 | 25 |
Feels °C | 29 | 29 | 29 | 29 | 28 | 27 | 28 | 29 | 27 | 28 | 29 | 25 | 28 | 27 | 26 | 28 | 27 | 25 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SSW 12 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 14 | SSW 14 | SSW 14 |
721 | 623 | 410 | 989 | 1501 | 2150 | 2611 | 2352 | 2592 | 2275 | 2053 | 1532 | 1281 | 1041 | 746 | 658 | 731 | 732 | 929 | 1240 | 1624 | |
Swell 2 Height (m) Direction Period (s) | SSE 6 | SE 6 | SW 19 | SSW 12 | SSW 12 | SE 5 | SE 6 | — | — | SE 6 | — | — | SSE 5 | — | — | — | — | SSW 6 | — | — | SSW 18 |
20 | 30 | 730 | 299 | 243 | 30 | 36 | — | — | 29 | — | — | 19 | — | — | — | — | 11 | — | — | 123 | |
Swell 3 Height (m) Direction Period (s) | SW 21 | SSW 21 | SE 5 | SE 5 | SW 12 | SSW 11 | — | — | — | — | — | — | — | — | — | — | — | W 16 | — | — | — |
224 | 302 | 16 | 21 | 51 | 103 | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 6 | ESE 6 | ESE 5 | SE 5 | SE 6 | SE 6 | ESE 6 | SE 6 | SE 5 | SE 6 | SE 5 | SSE 5 | SE 6 | SE 5 | SSE 5 | SSE 5 | SSE 5 | SE 5 | SE 5 | SSE 5 | SE 5 |
57 | 84 | 45 | 60 | 52 | 72 | 115 | 50 | 32 | 85 | 49 | 15 | 72 | 38 | 20 | 34 | 48 | 13 | 23 | 33 | 21 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 97 | 148 | 0 | 148 | 147 | 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.











