Surf Forecasts:
Green Ball surf forecast from 15 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 2AM (local time) - 10ft (3.0m), 17s period, SW swell with 5,160 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 3.0m 17s and forecast to arrive on Thursday (Aug 20) at 2AM. 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 7s period and expected on Wednesday (Aug 19) at 5AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 20th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Green Ball over the next 16 days.
The Lowdown
G’day, it’s Rusty.
Straight up, the next couple of weeks are going to test your patience. We’ve got a solid run of southwest groundswell on the cards, but the wind is just not playing the game for a good chunk of it. It’s a classic case of plenty of ocean energy getting messed up by a stiff cross-shore breeze. You’re gonna have to pick your moments, and even then, it’s all about managing expectations.
The window kicks off this Sunday the 16th. Out at Green Ball, we’ve got a clean 7ft SSW groundswell pushing through with a 16-second period. The energy reading is strong at 2350, so there’s plenty of push behind it. But the ESE breeze at 9 mph is creating a slight cross-chop, which will take the absolute shine off it. It’s surfable, but it’s not pretty. The morning is the only call on Sunday; the afternoon gets a bit more cross-on and starts to get chopped up.
Monday the 17th sees the swell drop slightly to 5ft, but the wind stays cross-shore. It’s more of the same, marginal stuff with a moderate cross-chop. Honestly, it’s a day to be doing something else unless you’re desperate.
We get a slight pulse mid-week, but the wind turns more cross-on. Tuesday the 18th has a strong 6ft SW swell, but the onshore component just ruins it. By Wednesday the 19th, we’re looking at 8ft of SW swell with an 18-second period – that’s a lot of water moving – but it’s crossed up and choppy. The energy is pumping at 3960, but it’s a washing machine. This is when it gets serious. Thursday the 20th pushes up to 10ft, but the conditions are just poor. If you’re an expert, you might find a sneaky one, but it’s really not for the faint-hearted. This is expert territory and even then, it’s not going to be fun. Honestly, with that onshore wind and that size, the setup looks more interesting for kite surfing than paddle surfing.
We get a bit of relief in the swell size on Friday the 21st, dropping to 6ft, but a fresh cross-shore breeze kicks in, making it lumpy and hard to read. Again, it’s a battle. The weekend of the 22nd and 23rd isn’t much better, with moderate cross-onshore winds and a lumpy, choppy ocean. The swell stays around the 7ft mark, but it’s not clean.
Now, here’s where you need to be patient. The run of swell is relentless, but the wind is the problem. It isn’t until the tail end of the period, around Thursday the 27th, that we start to see a glimmer of hope. The wind eases a touch, but it’s still cross-onshore. The energy is still solid, but it’s not clean.
Finally, the standout – and I mean the only real standout – is Saturday the 29th of August. The breeze finally eases right off to a light 6 mph ESE cross-onshore breeze. It’s not offshore, but it’s light enough to keep the surface reasonably tidy with just small wind ripples. The swell is a clean 5ft with a 14-second period from the SSW. The energy is moderate at 1668, but the extra-clean conditions will make it feel better than the numbers suggest. This is the morning to be out there. It won’t be epic, but it will be the most user-friendly conditions of the whole fortnight. Green Ball is a reef break, and with the light wind, you’ll actually be able to find a rhythm. It’s a late call, so it’s promising but less certain as a long-range standout, but it’s the one to circle on the calendar.
The last day of the month, Sunday the 30th, also looks like it could offer a similar window. The wind is set to be a gentle 9 mph and the swell is on the push again, around 6-7ft. The energy is strong, around 3032-3600. It won’t be as clean as Saturday, but it’s a backup if you miss the window. The period ends with a big 10ft pulse on Monday the 31st, but with a light cross-onshore wind. That’s a lot of water moving, and at 10ft, that is strictly for the experts. It’s a dangerous one.
So, that’s the run-down. Get out there Saturday the 29th and maybe Sunday the 30th if you’re keen. The rest is a grind. A lot of swell, but not a lot of quality. Keep it on your radar, but don’t force it.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sat night, min 25°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Tue night, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||
2620 | 2325 | 1811 | 1191 | 1042 | 862 | 590 | 1693 | 1449 | 1845 | 3883 | 4393 | 5160 | 4209 | 3499 | 2658 | 1563 | 3580 | 3319 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on |
High Tide | 00:00AM2.59m | 12:07PM2.53m | 00:30AM2.63m | 12:41PM2.35m | 00:59AM2.59m | 1:12PM2.14m | 1:27AM2.49m | 1:42PM1.90m | 1:56AM2.34m | 2:12PM1.67m | 2:26AM2.16m | 2:47PM1.44m | 3:05AM1.97m | ||||||
Low Tide | 6:04AM0.27m | 6:15PM0.16m | 6:41AM0.29m | 6:42PM0.29m | 7:17AM0.37m | 7:07PM0.44m | 7:53AM0.51m | 7:30PM0.62m | 8:31AM0.68m | 7:50PM0.80m | 9:18AM0.86m | 8:06PM0.98m | |||||||
— | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | |
6:17 | — | 6:17 | — | — | 6:17 | — | — | 6:17 | — | — | 6:17 | — | — | 6:17 | — | — | 6:17 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 26 | 27 | 26 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 26 | 24 | 26 | 25 | 24 | 25 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SSW 17 | SSW 16 |
2620 | 2325 | 1811 | 1191 | 1042 | 862 | 590 | 1693 | 1449 | 1845 | 3883 | 4393 | 5160 | 4209 | 3499 | 2658 | 1563 | 3580 | 3319 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 26 | SW 26 | SSW 20 | SSW 18 | SW 21 | SW 20 | SW 19 | — | — | — | — | — | — | SSW 18 | — | — |
— | — | — | 13 | 26 | 75 | 553 | 890 | 1111 | 1210 | — | — | — | — | — | — | 1144 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 25 | SW 24 | SW 24 | — | — | NE 7 | — | — | — | — | — | — | — | — | — |
— | — | — | — | 25 | 88 | 141 | — | — | 8 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | SE 5 | ESE 6 | SE 6 | SE 6 | ESE 6 | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SE 6 | ESE 6 | ESE 6 | ESE 7 | ESE 7 | SE 7 | SE 7 | ESE 6 |
18 | 25 | 27 | 53 | 59 | 47 | 51 | 42 | 55 | 71 | 77 | 94 | 82 | 130 | 159 | 273 | 303 | 227 | 209 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 16 | 35 | 35 | 36 |
Best forecast wave conditions in The Bukit - Bali | |||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











