Surf Forecasts:
Boulders surf forecast from 13 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 4PM (local time) - 7ft (2.2m), 15s period, S swell with 2,240 kJ wave energy.
Best Forecast Surf Conditions for Boulders this week:
The most powerful waves expected at Boulders in the next 16 days are 2.2m 15s and forecast to arrive on Thursday (Aug 20) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (+13) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 20th Aug) | 7ft (2.2m) 15s |
Table - best surf conditions forecast for Boulders over the next 16 days.
The Lowdown
Right, gather ‘round. Rusty here. Let’s have a look at the outlook for Boulders. It’s a reef break, advanced territory, and it’s pretty exposed so it catches a bit of everything. Water temp is sitting at 81°F which is about average for this time of year, nothing unusual there.
Honestly, I’ve got to level with you – this is a tough run. The first week is pretty much a write-off. We’ve got a consistent cross-shore wind from the ESE blowing at 19 to 19 mph, and that lumpy cross-chop is killing any chance of clean waves. The swell is from the ESE too, coming in around 4 ft to 6 ft with a short period of 9 seconds, so the wave energy is moderate. Poor surf conditions across the board. Thursday the 13th, Friday the 14th, Saturday the 15th – don’t bother.
Come Sunday the 16th, the swell direction swings to the SW and the period jumps to 18 seconds – that’s a proper groundswell, long-period stuff. But the height drops to just 3 ft and we’re still stuck with that ESE wind creating a cross-onshore chop. The energy is still moderate. It’s a tease.
We get a small window on Monday afternoon, the 17th. The wind eases to 9 mph and it’s a gentle cross-shore breeze. The swell is 3 ft from the SW with a 16-second period. The report calls it “marginal.” For an advanced break, a 3 ft SW groundswell with that long period might actually wrap in and offer some nice lines at Boulders – it’s a reef, after all, so that long period won’t break too straight like it would at a beach. But with the wind at cross-shore, it’s still going to be a bit jumbled. You could get a few, but it’s not going to be epic.
From Tuesday the 18th right through to the 27th, it’s a long stretch of poor to marginal conditions. The wind stays up, and the swell, though sometimes getting up to 7 ft and very strong energy, is constantly blown out by cross-onshore winds. That 7 ft from the S on the 20th with 15-second period is a proper lump, but with a fresh cross-onshore wind, it’ll be a washing machine. For an advanced spot, that’s expert-only, and even then, it’ll be a battle. Kite surfers might be eyeing that up, but for paddle surfing, it’s ugly.
Then we get to Friday the 28th. The swell is up to 8 ft from the SE, but the period drops to only 7 seconds – that’s short-period wind swell, crumbly and weak for its height. We’ve got a fresh cross-shore to cross-onshore wind at 22 mph. It’s beam-onshore slop.
There’s not a single day in this 16-day window that looks like a stand-out session. The best chance is that Monday afternoon on the 17th for a few quiet, cleanish lines if you’re an advanced surfer who doesn’t mind a bit of cross-chop. But truth be told, this is a disappointing outlook. Boulders is a good break, but the wind just doesn’t play ball anywhere in this forecast.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 25°C on Thu afternoon). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 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) | ESE 9 | E 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 |
Wave Graph | |||||||||||||||||||||
474 | 421 | 380 | 372 | 333 | 283 | 283 | 283 | 270 | 516 | 459 | 521 | 427 | 515 | 940 | 823 | 989 | 906 | 894 | 714 | 512 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:11PM1.13m | 7:29AM1.23m | 8:00PM1.13m | 8:18AM1.18m | 8:48PM1.11m | 9:08AM1.10m | 9:38PM1.07m | 9:59AM1.01m | 10:29PM1.02m | 10:54AM0.92m | 11:23PM0.97m | 11:54AM0.84m | 00:21AM0.93m | ||||||||
Low Tide | 1:01PM-0.02m | 1:13AM0.05m | 1:48PM0.01m | 2:04AM0.08m | 2:34PM0.06m | 2:55AM0.14m | 3:20PM0.13m | 3:47AM0.20m | 4:07PM0.21m | 4:43AM0.26m | 4:58PM0.28m | 5:44AM0.30m | 5:53PM0.33m | ||||||||
6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | |
— | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:21 | — | — | 6:21 | — | — | 6:21 | — | — | 6:21 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 24 |
Feels °C | 24 | 25 | 25 | 23 | 23 | 23 | 23 | 24 | 25 | 25 | 23 | 24 | 27 | 29 | 28 | 27 | 26 | 25 | 23 | 23 | 21 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 13 | S 13 | S 12 | S 12 | S 13 | S 12 | S 12 | S 11 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 |
253 | 350 | 263 | 180 | 134 | 219 | 98 | 138 | 118 | 516 | 459 | 521 | 427 | 515 | 940 | 823 | 989 | 906 | 894 | 714 | 512 | |
Swell 2 Height (m) Direction Period (s) | S 10 | SW 14 | S 17 | S 15 | S 14 | SW 17 | SW 16 | SW 16 | SW 18 | S 11 | S 11 | S 10 | ENE 8 | ESE 8 | E 8 | SW 11 | ENE 8 | E 8 | SSE 9 | E 8 | S 16 |
100 | 169 | 270 | 157 | 202 | 147 | 125 | 203 | 258 | 82 | 79 | 30 | 73 | 54 | 117 | 92 | 63 | 49 | 47 | 31 | 177 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | SSE 19 | SW 14 | SW 13 | SW 18 | SW 13 | S 13 | SW 19 | SW 14 | SE 12 | SE 12 | SSE 11 | S 10 | S 10 | S 10 | S 10 | SW 10 | SW 10 | SSE 13 | SSE 13 | SE 12 |
67 | 117 | 132 | 88 | 152 | 43 | 55 | 94 | 103 | 37 | 35 | 41 | 75 | 73 | 70 | 68 | 60 | 77 | 69 | 65 | 39 | |
Wind waves Height (m) Direction Period (s) | ESE 9 | E 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | E 8 | ESE 8 | E 8 | ESE 8 | E 8 | ESE 8 | SE 8 | ESE 8 | SE 5 | SE 7 |
474 | 421 | 380 | 372 | 333 | 283 | 283 | 283 | 270 | 246 | 202 | 190 | 88 | 109 | 78 | 137 | 86 | 70 | 140 | 82 | 331 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 105 | 577 | 62 | 577 | 105 | 584 | 584 | 62 | 105 | 577 | 105 | 62 | 62 | 62 | 62 | 22 | 105 | 105 | 2206 | 1251 | 2415 |
Best forecast wave conditions in Upolu | |||||||||||||||||||||
Best forecast wave conditions in Samoa | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
Information about the Boulders Surf forecast
The above surf forecast table for Boulders provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Boulders can be found by selecting the local surf guide option on the grey menu. Our Boulders 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 (Boulders) 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 Boulders 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.
Are you planning a holiday in Otago? If you are looking for accommodation near Otago Peninsula - Boulder Beach, camping, hotels and holiday cottages in Otago, consider staying in Dunedin which is 9 km (6 miles) away.











