Surf Forecasts:
Kandui Left surf forecast from 31 Aug 2026:
- Best quality surf: Thursday 3 Sep, 10AM (local time) - 5ft (1.5m), 14s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 7AM (local time) - 8ft (2.5m), 17s period, SSW swell with 4,002 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 10AM (local time) - 5ft (1.5m), 14s period with SW swell.
Best Forecast Surf Conditions for Kandui Left this week:
The surf forecast for Kandui Left over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 03) at 10AM. The primary swell is predicted to be 1.5m and 14s period with a secondary swell of 0.9m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kandui Left in the next 16 days are 2.5m 17s and forecast to arrive on Tuesday (Sep 01) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Thu 3rd Sep) | 5ft (1.5m) 14s |
| Best Surf | 10AM (Thu 3rd Sep) | 5ft (1.5m) 14s |
| Most Powerful | 7AM (Tue 1st Sep) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Kandui Left over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it for the Mentawais. We’ve got one spot on the radar for the next 16 days, and it’s a bit of a mixed bag, so pay close attention.
Overall, there’s a lot of energy in the water from the get-go, with a powerful, long-period SW groundswell building through the first week. The problem is, the wind is mostly a pest, blowing cross or cross-onshore from the SSE, which is going to put a chop on most sessions. The standouts come in the form of brief windows of clean conditions, and one morning that looks truly special.
Starting off on Monday the 31st of August and into Tuesday, the swell is solid – 6 ft to 8 ft out of the SW with a very long period of 17 to 18 seconds. This is serious groundswell energy, with combined energy readings between 2419 and 3333 – that’s strong to very strong. But the wind is a problem. It’s blowing 12 to 12 mph from the SSE, making for a cross-shore to cross-onshore chop. That’s a lot of bump on a powerful wave. It’ll be out there, but it’s not going to be clean. For beginners, that 8 ft swell on Tuesday is too big anyway.
The first real highlight is Thursday, the 3rd of September. The swell drops a touch to 5 ft from the SW, still a nice 14-second period, and the wind goes totally glass. The morning is calm, the afternoon has just a whisper from the WNW. This is the window. The combined energy is moderate at 1049 to 1054, but with zero wind, that Kandui Left reef will be clean, walling up, and offering long rides. The water is a balmy 86°F, which is about 1°F warmer than average for this time of year – feels just right. This is the best day on offer for experienced surfers who can handle a consistent reef break at 5 ft. It’s worth noting this spot is “fairly consistent” and exposed to the SW swell, so you’ll get waves, but with this quality, expect crowds – the book says “always.”
Friday the 4th of September drops off a little. Cleaner in the morning with a light ESE cross-off breeze pushing 4 ft SSW swell (13-second period, 688 energy) into the break, but it’s a noticeable step down in size and power. The afternoon crosses up on you again.
From the 5th of September through to the 7th, we’re stuck in a bit of a rut. The swell hangs around the 3 ft to 4 ft mark out of the SSW with decent period, but the wind is back to a moderate 12 mph cross-shore from the SE or SSE. It’s messy. These days are just average.
Now, look ahead. Tuesday the 8th and Wednesday the 9th of September bring another promising run. The swell is small again, 4 ft out of the SSW to S, but the period jumps back up to 15-18 seconds. More importantly, the wind goes light and cross-off from the ESE in the mornings. These mornings are clean, with combined energy readings around 1380 to 1589 – moderate, but that light wind on a long-period SSW groundswell at Kandui will give you smooth, peeling lefts. The afternoons are a write-off, but the mornings are worth the paddle out. This is your second standout, but it’s for the early birds.
The swell builds again later in the second week. Around Thursday the 10th of September, we see 6 ft to 7 ft from the SSW with 16 to 17-second period and strong energy readings (2616 to 2742). The wind is light and cross to cross-on, so not perfect, but the size and power will be there for the experts. Expect choppy conditions, not the cleanest.
We hit a real low point on Monday the 14th of September. The wind cranks up to 16 mph from the SSE, putting a heavy cross-onshore chop on the 5 ft SSW swell. That’s poor conditions, and the forecast says as much. That’s a day to stay out.
Towards the end of the run, Tuesday the 15th of September shows a pulse of 7 ft to 7 ft SSW swell with 16-second period and strong energy (2159 to 2291), but the wind is still a factor, being cross to cross-onshore. It’s a big, powerful swell, but it won’t be its best self.
To sum it up: The clear standout is Thursday, the 3rd of September. Get on that morning glass. The next best is the mornings of Tuesday the 8th and Wednesday the 9th. Get after it.
Rusty.
Short Range ForecastHeavy rain (total 48mm), heaviest during Wed night. Warm (max 28°C on Mon morning, min 25°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 28mm), heaviest during Thu morning. Warm (max 28°C on Fri morning, min 26°C on Thu afternoon). Wind will be generally light. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 | SSW 17 | SSW 15 | SSW 16 | SSW 16 | SSW 15 |
Wave Graph | |||||||||||||||||||||
1974 | 2660 | 3345 | 3119 | 2776 | 2357 | 1852 | 1571 | 1300 | 928 | 915 | 890 | 581 | 458 | 346 | 958 | 969 | 522 | 892 | 493 | 879 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross | glassy | glassy | cross | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross |
High Tide | 8:22PM1.14m | 8:25AM1.02m | 8:55PM1.15m | 8:56AM0.92m | 9:32PM1.14m | 9:30AM0.81m | 10:18PM1.09m | 10:12AM0.69m | 11:20PM1.03m | 11:19AM0.58m | 00:51AM0.99m | 1:44PM0.54m | 2:31AM1.01m | ||||||||
Low Tide | 2:00PM0.00m | 2:25AM0.09m | 2:30PM0.01m | 3:07AM0.12m | 3:02PM0.04m | 3:53AM0.18m | 3:37PM0.09m | 4:47AM0.25m | 4:19PM0.15m | 5:59AM0.33m | 5:14PM0.23m | 7:47AM0.35m | 6:36PM0.30m | ||||||||
6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:24 | — | — | 6:24 | — | — | 6:23 | — | — | 6:23 | — | — | 6:23 | — | — | 6:23 | — | — | 6:22 | — | |
mm | 1 | — | 4 | 4 | 1 | 8 | 7 | 3 | 20 | 12 | 2 | 2 | — | 1 | 4 | 3 | 1 | 3 | 2 | 2 | 6 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 32 | 32 | 30 | 29 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 | SSW 17 | SSW 15 | SSW 16 | SSW 16 | SSW 15 |
1974 | 2660 | 3345 | 3119 | 2776 | 2357 | 1852 | 1571 | 1300 | 928 | 915 | 890 | 581 | 458 | 346 | 958 | 969 | 522 | 892 | 493 | 879 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | W 10 | S 11 | WNW 9 | — | — | W 17 | WNW 8 | SSE 8 | SSE 8 | WNW 8 | SSE 8 | SSE 8 | SSE 8 | SSW 16 | WNW 8 | WNW 8 | SSW 18 | S 20 | SSW 13 | W 8 |
95 | 8 | 37 | 8 | — | — | 22 | 7 | 104 | 101 | 6 | 96 | 99 | 75 | 273 | 7 | 7 | 443 | 188 | 277 | 1 | |
Swell 3 Height (m) Direction Period (s) | WNW 10 | — | WNW 9 | — | — | — | — | — | W 16 | W 16 | — | NW 8 | WNW 9 | SSW 17 | SSE 8 | W 13 | W 13 | WNW 10 | WNW 10 | S 19 | W 10 |
9 | — | 16 | — | — | — | — | — | 20 | 20 | — | 2 | 8 | 97 | 32 | 4 | 3 | 10 | 9 | 358 | 2 | |
Wind waves Height (m) Direction Period (s) | S 12 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | — | — | SSE 8 | — | — | — | SSE 4 | SSE 5 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 9 |
341 | 206 | 169 | 206 | 169 | 144 | 130 | 137 | — | — | 133 | — | — | — | 24 | 69 | 256 | 264 | 284 | 319 | 433 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 487 | 156 | 6 | 105 | 6 | 6 | 6 | 6 | 0 | 0 | 6 | 0 | 6 | 0 | 6 | 6 | 6 | 6 | 6 | 6 |
Best forecast wave conditions in Mentawi Islands | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
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Information about the Kandui Left Surf forecast
The above surf forecast table for Kandui Left provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kandui Left can be found by selecting the local surf guide option on the grey menu. Our Kandui Left 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 (Kandui Left) 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 Kandui Left 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.











