Surf Forecasts:
Downtowns surf forecast from 1 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 8PM (local time) - 10ft (3.0m), 18s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 8PM (local time) - 10ft (3.0m), 18s period, SSW swell with 4,618 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 8AM (local time) - 7ft (2.1m), 17s 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 Wednesday (Sep 02) at 8AM. The primary swell is predicted to be 2.1m and 17s period with a secondary swell of 0.6m and 6s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Downtowns in the next 16 days are 3.0m 18s and forecast to arrive on Tuesday (Sep 08) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Thursday (Sep 03) at 8AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 2nd Sep) | 7ft (2.1m) 17s |
| Best Surf | 8PM (Tue 8th Sep) | 10ft (3.0m) 18s |
| Most Powerful | 8PM (Tue 8th Sep) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk waves.
Only one spot has got anything going on in this run: Downtowns. It’s a reef, so it handles swell well. The water temp is 80°, pretty much normal for now.
Wednesday morning September 2nd starts off with a 7ft SW groundswell, period a super-long 17 seconds. Packs a punch, energy reading 2302. A light SSE cross breeze messes with it a bit, but Wednesday afternoon? That’s the one. Wind shifts light ESE offshore, swell drops to 7ft, period still 16 seconds, energy 2053 — clean, lined-up, and glassy. This is the best window of the whole forecast. For experienced surfers, this is excellent.
Thursday the 3rd: swell drops to 5ft in the morning, period 16 seconds, energy 1329, but cross wind. Thursday afternoon cleans up with offshore ESE at 6 mph, 5ft SW, period 16 seconds, energy 1041 — very good.
Friday the 4th: small, 4–5ft SW, period 14 seconds, energy around 750. Not special. Friday afternoon has clean conditions with a light cross-off SSE breeze, so there are some fun ones.
The weekend goes sideways. Saturday the 5th: swell builds to 6–6ft, but wind swings S and picks up to 12 mph, chopping the surface. Energy moderate at 1277–1743, but quality drops. Sunday the 6th: 5–7ft SW swell, moderate S cross wind at 12 mph, energy 1984–2212, but bumpy.
Monday the 7th: swell holds at 7ft from SSW, period 14 seconds, still cross wind at 9–12 mph. Energy strong at 1977–1948, but bumpy.
Tuesday the 8th: morning swell drops to 5ft, but period jumps to 19 seconds – real long-period groundswell. Energy 2858. Wind is S cross at 9 mph, so not glassy but the lines will be clean. Tuesday afternoon: 6ft, period 18 seconds, energy 3505 – strong. Cross wind keeps it from perfection, but still a good day.
Wednesday the 9th: biggest swell of the run – 8ft SSW, period 16 seconds, energy 3222. Wind is S cross at 9 mph, so big, powerful, but lumpy. Only experts. Thursday the 10th: backs off to 5–6ft, energy 1821–1631, cross wind.
From Friday the 11th on, there are some clean windows. Friday afternoon: SSE cross-off, 5ft SW, period 15 seconds, energy 1332. Saturday the 12th afternoon: small at 4ft but very long period 21 seconds, energy 2010, SE cross-off – glassy and clean. Sunday the 13th afternoon: 7ft SW, period 17 seconds, ESE offshore, energy 2863 – excellent for experienced surfers.
Monday the 14th afternoon: SE cross-off, 6ft SW, period 16 seconds, energy 1532 – clean. Tuesday the 15th afternoon: offshore ESE, 6ft SW, period 16 seconds, energy 1597 – glassy. Wednesday the 16th afternoon: same deal, 6ft SW, period 15 seconds, offshore ESE, energy 1423. Thursday the 17th afternoon: 4ft SW, period 20 seconds, cross-off SE, energy 1853 – clean long-period lines.
Best on offer: Wednesday afternoon, September 2nd. Offshore wind, 7ft SW groundswell, 16-second period, clean. Second standout: Sunday afternoon, September 13th – 7ft SW, offshore ESE, period 17 seconds. Both are for experienced surfers. This reef can get a few people on it, but the quality makes up for it.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Wed afternoon, min 22°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Sat afternoon, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SSW 14 | SSW 14 | SSW 16 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 19 | SSW 18 | SSW 17 |
Wave Graph | |||||||||||||||||||||
2275 | 2053 | 1532 | 1297 | 1041 | 746 | 726 | 742 | 672 | 1277 | 1743 | 1265 | 1624 | 1122 | 2206 | 1956 | 1902 | 1346 | 1592 | 2325 | 4256 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | off | cross | off | off | cross | cross-off | off | cross | cross | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross | cross | cross-off |
High Tide | 1:50PM1.11m | 1:36AM1.65m | 2:48PM0.93m | 2:12AM1.63m | 4:58PM0.79m | 3:02AM1.57m | 4:30AM1.52m | 6:28AM1.52m | 10:32PM1.09m | 7:56AM1.58m | 10:24PM1.17m | ||||||||||
Low Tide | 6:56PM0.64m | 8:50AM0.41m | 7:05PM0.72m | 10:09AM0.44m | 6:38PM0.78m | 12:17PM0.42m | 2:05PM0.32m | 3:01PM0.23m | 1:30AM1.03m | 3:40PM0.17m | 2:56AM0.88m | ||||||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 6:10 | — | — | 6:10 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 24 | 27 | 28 | 24 | 26 | 27 | 24 | 26 | 27 | 25 | 27 | 27 | 25 | 26 | 26 | 24 | 26 | 26 | 25 |
Feels °C | 27 | 28 | 25 | 28 | 27 | 25 | 27 | 26 | 24 | 27 | 26 | 27 | 27 | 26 | 26 | 25 | 24 | 24 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SSW 14 | SSW 14 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 |
2275 | 2053 | 1532 | 1297 | 1041 | 746 | 726 | 742 | 672 | 1277 | 1743 | 1265 | 1624 | 1090 | 2206 | 1956 | 1902 | 1346 | 1266 | 1180 | 4256 | |
Swell 2 Height (m) Direction Period (s) | SE 6 | — | — | SE 6 | — | — | SSE 6 | — | SSW 18 | — | — | SSW 17 | SSW 18 | SSW 16 | — | SW 23 | SSW 22 | SW 21 | SSW 19 | SSW 18 | — |
27 | — | — | 32 | — | — | 28 | — | 348 | — | — | 622 | 360 | 1122 | — | 21 | 46 | 450 | 1592 | 2325 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 62 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 6 | SE 5 | SE 5 | ESE 6 | SE 5 | SE 5 | ESE 6 | SSE 5 | SSE 5 | SE 5 | SSE 5 | SE 5 | SE 4 | — | — | — | — | — | — | — | — |
80 | 45 | 23 | 100 | 39 | 24 | 87 | 47 | 28 | 27 | 37 | 22 | 20 | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 4 | 147 | 0 | 183 | 177 | 0 | 147 | 4 | 0 | 4 | 147 | 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.











