Surf Forecasts:
Mona Vale-The Basin surf forecast from 26 Aug 2026:
- Best quality surf: Thursday 27 Aug, 10PM (local time) - 2ft (0.6m), 9s period, ENE swell with glassy winds.
- Most powerful swell: Saturday 29 Aug, 7PM (local time) - 3.5ft (1.1m), 10s period, SE swell with 250 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 10PM (local time) - 2ft (0.6m), 9s period with ENE swell.
Best Forecast Surf Conditions for Mona Vale-The Basin this week:
The surf forecast for Mona Vale-The Basin over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 27) at 10PM. The primary swell is predicted to be 0.6m and 9s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Mona Vale-The Basin in the next 16 days are 1.1m 10s and forecast to arrive on Saturday (Aug 29) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 9s period and expected on Thursday (Aug 27) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 27th Aug) | 2ft (0.6m) 9s |
| Best Surf | 10PM (Thu 27th Aug) | 2ft (0.6m) 9s |
| Most Powerful | 7PM (Sat 29th Aug) | 3.5ft (1.1m) 10s |
Table - best surf conditions forecast for Mona Vale-The Basin over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on offer for the next couple of weeks.
Honestly, mate, it’s a quiet stretch ahead. We’re looking at a long run of small, weak, and mostly messy conditions. The first week or so is pretty much a write-off for any decent paddle surfing. The good news is that we do eventually see a few cleaner windows, but you’ll have to be patient.
The only spot with any real recommendation is Mona Vale-The Basin, a reef break that’s inconsistent and can get crowded. It’s exposed to the swell, and the best direction for it is from the NE. The water temp is about average for the time of year, nothing unusual there.
For the first several days, from Thursday the 27th of August right through to around the end of the month, it’s all tiny and poor. Swell heights are stuck between 1 ft and 2 ft, almost all from the ENE with a short period of 8 seconds – that’s weak, wind-driven slop. The combined energy is low, sitting between 28 and 54, so there’s just no power in the water. Winds are mostly cross or cross-onshore, chopping things up, so it’s not worth suiting up.
We get a brief glimmer on the morning of Monday the 31st of August – glassy conditions with tiny 1 ft ENE swell, but it’s still too small to do anything on. That calm, clean vibe continues through the first few days of September, but again, the size is just not there. The period does stretch out to 11 seconds on the 1st of September, which is a better sign, but the wave height is still only 1 ft to 1 ft, so it’s really just a nice day to be at the beach, not for surfing.
The standout, if you can call it that, comes on the afternoon of Tuesday the 1st of September. The wind shifts to a light offshore from the WNW, and the swell period jumps to 11 seconds, with the combined energy hitting 78. The swell is still only 1 ft from the ENE, but with clean conditions, you might snag a few small, tidy waves. Then on Wednesday the 2nd of September, the morning sees a moderate offshore wind from the NW and a slightly bigger 2 ft swell from the east with a 10-second period and energy of 60. It’s surfable, but very ordinary. These are the best on offer, but they’re really only for the patient, longboard-friendly surfer.
After that, it’s back to small and clean but weak, with nothing really building. The 7th of September shows a small bump in energy to 112, with a 3 ft swell from the NE and a 9-second period, but the wind is cross-shore, so it’s messy. The 8th of September has a 4 ft swell from the NE, but with only a 6-second period and poor conditions, it’s not going to be fun.
The 11th of September morning looks glassy with a 2 ft NE swell, which is a nice end to the run, but still tiny.
Overall, it’s a period of small, weak surf. The only real windows are the 1st and 2nd of September, but even then, you’re looking at knee-high waves. If you’re desperate for a paddle, those are your best bets, but don’t expect much. For the rest of the time, the beach setups might be more interesting for a kite surfer than a paddle surfer, given the lack of swell and the wind patterns.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Very mild (max 16°C on Fri morning, min 11°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 12°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 11 | ENE 11 | NE 6 |
Wave Graph | |||||||||||||||||||
84 | 54 | 40 | 67 | 38 | 26 | 24 | 28 | 28 | 31 | 30 | 29 | 32 | 29 | 28 | 26 | 23 | 39 | 39 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | off | cross-off | cross-on | cross-on | cross-on | cross-on | glassy | off | cross-on | glassy | glassy | cross | cross-off | cross-off | off | off |
High Tide | 7:41AM1.15m | 7:40PM1.55m | 8:15AM1.23m | 8:15PM1.55m | 8:49AM1.30m | 8:51PM1.52m | 9:24AM1.36m | 9:28PM1.45m | 10:01AM1.41m | 10:08PM1.36m | 10:41AM1.43m | 10:53PM1.25m | |||||||
Low Tide | 1:43AM0.18m | 1:19PM0.32m | 2:14AM0.13m | 1:59PM0.28m | 2:44AM0.10m | 2:39PM0.25m | 3:15AM0.10m | 3:21PM0.25m | 3:46AM0.12m | 4:06PM0.26m | 4:20AM0.17m | 4:56PM0.28m | |||||||
— | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | |
— | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — | — | 5:35 | — | — | 5:36 | — | |
mm | 1 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 15 | 14 | 16 | 15 | 15 | 16 | 15 | 14 | 17 | 15 | 15 | 17 | 16 | 15 | 24 | 26 | 20 |
Feels °C | 12 | 12 | 13 | 13 | 13 | 12 | 13 | 14 | 13 | 14 | 15 | 13 | 15 | 15 | 13 | 13 | 21 | 23 | 17 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 9 | S 9 | S 9 | SSE 11 | SSE 10 | SSE 9 | SSE 10 | S 8 | S 8 | S 9 | S 9 | S 9 | S 8 | S 9 | S 10 | S 12 | S 11 | NE 6 |
246 | 707 | 421 | 258 | 643 | 380 | 322 | 347 | 187 | 138 | 150 | 225 | 185 | 132 | 175 | 113 | 225 | 152 | 39 | |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | S 9 | SSE 10 | SSE 10 | SE 9 | ENE 9 | S 16 | S 17 | S 16 | S 15 | ENE 11 | ENE 11 | S 10 |
84 | 54 | 40 | 67 | 38 | 26 | 24 | 262 | 261 | 168 | 88 | 29 | 82 | 284 | 183 | 104 | 23 | 39 | 78 | |
Swell 3 Height (m) Direction Period (s) | S 15 | S 15 | S 14 | SSE 13 | S 14 | S 13 | S 11 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | S 16 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | N 12 | ENE 10 |
4 | 17 | 36 | 98 | 58 | 54 | 37 | 28 | 28 | 31 | 30 | 21 | 32 | 29 | 28 | 26 | 7 | 3 | 34 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | S 3 | S 5 | SSE 10 | — | — | — | — | — | — | — | NNE 3 | NE 4 | NE 4 | WNW 2 |
— | — | — | — | — | 3 | 17 | 768 | — | — | — | — | — | — | — | 4 | 3 | 36 | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 45 | 2 | 0 | 2 | 127 | 2 | 2 | 50 | 2 | 2 | 15 | 2 | 2 | 15 | 2 | 2 | 0 | 0 |
Best forecast wave conditions in Sydney North Coast | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
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Information about the Mona Vale-The Basin Surf forecast
The above surf forecast table for Mona Vale-The Basin provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mona Vale-The Basin can be found by selecting the local surf guide option on the grey menu. Our Mona Vale-The Basin 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 (Mona Vale-The Basin) 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 Mona Vale-The Basin 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.
Mona Vale-The Basin is 8 km (5 miles) from Dee Why. If you plan a holiday in Sydney North Coast, look for hotels and other accommodation in Dee Why. Dee Why has rooms for a wide range of budgets as well as car hire and transport links.











