Surf Forecasts:
Downtowns surf forecast from 27 Aug 2026:
- Best quality surf: Friday 28 Aug, 5AM (local time) - 8ft (2.5m), 18s period, SSW swell with offshore winds.
- Most powerful swell: Friday 28 Aug, 8AM (local time) - 8ft (2.5m), 17s period, SW swell with 4,161 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 8PM (local time) - 4.5ft (1.3m), 20s 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 Thursday (Aug 27) at 8PM. The primary swell is predicted to be 1.7m and 15s period with a secondary swell of 1.3m and 20s. 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 17s and forecast to arrive on Friday (Aug 28) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Thursday (Sep 03) at 5AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 27th Aug) | 4.5ft (1.3m) 20s |
| Best Surf | 5AM (Fri 28th Aug) | 8ft (2.5m) 18s |
| Most Powerful | 8AM (Fri 28th Aug) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Downtowns over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at what we’ve got here for the next couple of weeks. It’s a pretty solid run, but it takes a little bit to get going.
The first real action kicks off on Thursday, August 27th, but honestly, it’s a bit of a slow start. The swell is there but it’s small and the wind is cross-on, so it’s not the cleanest. Hold out for the weekend.
The standout period is from Saturday, August 29th afternoon right through to Tuesday, September 1st. That’s where the magic is. Saturday afternoon, the wind drops to glassy, and we’ve got a clean 6ft SW swell coming in with a 15-second period. That’s proper groundswell energy, and the combined energy is sitting at 1259 (moderate). For a reef break like Downtowns, that long period is a dream – it’ll wrap in and focus up nicely. The water temperature is 80°, which is spot on average for this time of year, so no surprises there.
But the absolute best of the whole run? Monday, August 31st afternoon. We’re looking at 5ft of SW swell, an 18-second period, glassy conditions, and a combined energy of 1763 (moderate). That’s clean, powerful, and lined up perfectly for an advanced wave. This is for experienced surfers only, and it’s a true standout. The crowds at Downtowns can be there sometimes, but on a Monday, you might get a bit more room.
Tuesday, September 1st afternoon is also a cracker: 7ft of SW swell, 17-second period, glassy, and the energy is up to 2364 (moderate). That’s a bit bigger, still clean, but definitely for the experienced crew.
Things look good through the start of the second week. Wednesday, September 2nd afternoon is clean with 7ft SW swell, and Thursday, September 3rd afternoon is glassy with 5ft. The swell drops a bit going into the 4th and 5th, but the glassy windows keep popping up.
There’s a slight shift in direction around the 5th of September, swinging more to the SSW, but the quality holds. The 7th of September Monday afternoon is worth a mention: glassy, 7ft SSW swell, and excellent conditions for advanced surfers. The energy is 1723 (moderate).
The last big highlight is on the 11th of September. Friday afternoon: glassy, 7ft SSW swell, 14-second period, and the energy is 1752 (moderate). That’s a great way to close out the outlook, but keep in mind it’s further out, so it’s less certain.
Overall, the best on offer is Monday, August 31st afternoon and Tuesday, September 1st afternoon. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 22°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Tue afternoon, min 22°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 20 | SSW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 19 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 558 | 769 | 3535 | 3877 | 3197 | 2594 | 1641 | 1237 | 1002 | 721 | 623 | 730 | 989 | 1501 | 2150 | 2611 | 2324 | 2592 | 2302 | 2053 | 1532 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | off | cross-on | cross-on | glassy | cross-on | glassy | off | cross | glassy | cross-off | glassy | glassy | off | cross | glassy | off | cross | cross-off | off |
High Tide | 10:01AM1.62m | 11:27PM1.27m | 10:37AM1.64m | 11:42PM1.36m | 11:13AM1.62m | 11:59PM1.44m | 11:49AM1.55m | 00:19AM1.52m | 12:26PM1.43m | 00:41AM1.59m | 1:06PM1.29m | 1:06AM1.63m | 1:50PM1.11m | 1:36AM1.65m | |||||||
Low Tide | 5:07PM0.20m | 4:38AM0.72m | 5:28PM0.23m | 5:13AM0.62m | 5:48PM0.29m | 5:49AM0.53m | 6:07PM0.37m | 6:27AM0.46m | 6:25PM0.46m | 7:08AM0.41m | 6:41PM0.55m | 7:54AM0.39m | 6:56PM0.64m | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:13 | — | — |
 | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — | — | 6:10 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 28 | 25 | 27 | 28 | 24 |
Feels °C | 28 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 28 | 29 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 28 | 28 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 |
| kJ | 353 | 482 | 3535 | 3877 | 3197 | 2594 | 1641 | 1237 | 1002 | 721 | 623 | 449 | 989 | 1501 | 2150 | 2611 | 2324 | 2592 | 2302 | 2053 | 1532 |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 15 | SE 6 | SE 6 | — | SE 6 | SE 5 | SE 6 | SSW 24 | SSE 5 | SE 6 | SW 19 | SW 12 | SSW 12 | S 11 | SE 7 | SE 6 | SE 6 | SE 6 | — | — |
| kJ | 558 | 523 | 42 | 30 | — | 25 | 14 | 15 | 54 | 19 | 36 | 730 | 330 | 239 | 188 | 35 | 40 | 24 | 32 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 22 | SW 20 | — | — | — | — | SSW 6 | SSW 6 | S 6 | SW 21 | SSW 21 | SE 5 | SE 5 | SE 5 | — | — | — | — | — | — | — |
| kJ | 229 | 769 | — | — | — | — | 7 | 7 | 3 | 224 | 302 | 12 | 13 | 23 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SE 5 | SE 5 | — | SE 6 | — | SE 6 | SE 6 | SE 5 | ESE 5 | ESE 6 | SE 5 | ESE 5 | ESE 6 | ESE 5 | ESE 7 | ESE 6 | SE 6 | SE 6 | SE 5 | SE 5 |
| kJ | — | 35 | 34 | — | 39 | — | 40 | 46 | 10 | 49 | 81 | 36 | 41 | 55 | 42 | 116 | 90 | 64 | 94 | 51 | 25 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 0 | 4 | 4 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 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.
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