Surf Forecasts:
Green Ball surf forecast from 12 Sep 2026:
- Most powerful swell: Sunday 13 Sep, 2PM (local time) - 7.5ft (2.3m), 17s period, SW swell with 3,235 kJ wave energy.
Best Forecast Surf Conditions for Green Ball this week:
The most powerful waves expected at Green Ball in the next 16 days are 2.3m 17s and forecast to arrive on Sunday (Sep 13) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 8s period and expected on Monday (Sep 14) at 2PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sun 13th Sep) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Green Ball over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down Green Ball. It’s a reef that loves a solid SSW swell and breaks fairly often, but you’re gonna need patience.
Water temp is 79°, right on the money for this time of year. The swell energy is strong to very strong, with readings in the thousands (3067 on that first morning), but the wind situation kills it. For the first nine days, we’ve got a stubborn cross-onshore breeze – moderate to light, but enough to mess up the surface. Swell runs from 4ft to 8ft, mostly out of the SW or SSW, with periods between 13 and 18 seconds. That’s proper long-period groundswell, good for a reef, but the wind won’t let it groom out. There’s no real standout until Thursday, September 24th.
That Thursday morning is the window. We finally get a gentler cross-shore wind with only a slight chop, on a 7ft SSW groundswell at 15 seconds. The energy’s strong (2320) and it’s the closest we get to clean conditions in the whole 16 days. This is the one to aim for – the best shot at some hollow, powerful rides. After that, the wind swings back cross-onshore by afternoon. It’s an advanced spot, and crowds can pop up, so beat the rush.
The mornings of September 26th and 27th offer a light cross-onshore breeze with 7ft to 8ft SSW swell, but the wind’s still not as clean as that Thursday. September 28th morning has some clouds and a light breeze with a 6ft SSW groundswell at 17 seconds – another option, but that Thursday is the clear winner.
So, it’s a tough first week with good swell and bad wind. The real hope is that Thursday the 24th, and maybe a couple of mornings after. For a spot that’s usually reliable, that’s a long dry spell.
- Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sun afternoon, min 25°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 26°C on Wed night, min 25°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 15 | SW 14 | SSW 14 | SW 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2381 | 2878 | 2113 | 1742 | 1622 | 1540 | 1561 | 1455 | 1417 | 1358 | 1488 | 1626 | 1667 | 1582 | 1349 | 1019 | 555 | 869 | 752 | 663 | 2312 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 11:13AM2.52m | 11:24PM2.74m | 11:44AM2.43m | 11:51PM2.74m | 12:14PM2.28m | 00:17AM2.66m | 12:41PM2.10m | 00:42AM2.53m | 1:07PM1.90m | 1:07AM2.36m | 1:33PM1.68m | 1:33AM2.16m | 2:02PM1.47m | 2:03AM1.95m | |||||||
Low Tide | 5:13PM0.20m | 5:40AM0.09m | 5:39PM0.27m | 6:12AM0.12m | 6:03PM0.37m | 6:42AM0.22m | 6:26PM0.50m | 7:13AM0.38m | 6:47PM0.65m | 7:45AM0.58m | 7:05PM0.82m | 8:23AM0.79m | 7:17PM0.99m | ||||||||
 | |  | | |  | | | | | |  | | | | | | | | | | |
 | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 26 |
Feels °C | 26 | 26 | 26 | 25 | 25 | 24 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 27 | 28 | 27 | 28 | 27 | 27 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 15 | SW 14 | SSW 14 | SW 17 |
| kJ | 2381 | 2878 | 2113 | 1742 | 1622 | 1540 | 1561 | 1455 | 1417 | 1358 | 1488 | 1626 | 1667 | 1582 | 1349 | 1019 | 555 | 869 | 752 | 663 | 2312 |
Swell 2 Height (m) Direction Period (s) | SW 14 | — | — | — | NE 8 | — | — | — | ENE 7 | SSW 21 | W 16 | NE 7 | — | SSW 8 | — | SW 22 | SSW 16 | SW 20 | SW 18 | SW 18 | SW 13 |
| kJ | 590 | — | — | — | 9 | — | — | — | 5 | 45 | 5 | 9 | — | 50 | — | 18 | 436 | 100 | 272 | 540 | 444 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 16 | W 16 | — | — | — | — | — | — | SSW 21 | — | W 18 | — | — |
| kJ | — | — | — | — | — | — | — | — | 5 | 5 | — | — | — | — | — | — | 43 | — | 6 | — | — |
Wind waves Height (m) Direction Period (s) | ESE 6 | SE 6 | ESE 6 | SE 6 | ESE 7 | ESE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | ESE 6 | ESE 6 | ESE 5 | ESE 6 | ESE 5 | ESE 5 | SE 5 | SE 6 |
| kJ | 96 | 91 | 190 | 157 | 170 | 154 | 83 | 95 | 89 | 89 | 52 | 88 | 92 | 80 | 49 | 34 | 27 | 37 | 16 | 22 | 38 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 8 | 8 | 16 | 35 | 35 | 8 | 8 | 8 | 8 | 8 | 9 | 8 | 8 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Best forecast wave conditions in The Bukit - Bali | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
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Information about the Green Ball Surf forecast
The above surf forecast table for Green Ball provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Green Ball can be found by selecting the local surf guide option on the grey menu. Our Green Ball 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 (Green Ball) 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 Green Ball 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.
Green Ball is 14 km (9 miles) from the city of Kuta. If you plan a holiday in The Bukit - Bali, look for hotels and other accommodation in Kuta. Kuta has rooms for a wide range of budgets as well as car hire and transport links.
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