Surf Forecasts:
Ruby Bay surf forecast from 20 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 3.5ft (1.1m), 6s period, NW swell with 90 kJ wave energy.
Best Forecast Surf Conditions for Ruby Bay this week:
The most powerful waves expected at Ruby Bay in the next 16 days are 1.1m 6s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Sunday (Aug 23) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Tue 25th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here. Let’s be straight with you: the next 16 days are a real mixed bag for Ruby Bay, with a lot of waiting around. The opening week is a write-off, but there’s a glimmer of something better further out.
First things first, there’s a big gap of no surfable waves. From now until the end of August, you’re looking at a solid 10 days with nothing to get excited about. The swell is tiny, the energy is zero, and the conditions are just flat. There’s a brief moment on the afternoon of Saturday the 22nd with a tiny 2ft NW swell, but it’s a weak, short-period windswell (5 seconds) with only 16 units of energy – it’s barely a ripple. Don’t even bother.
The real interest doesn’t appear until the first week of September. On Wednesday the 2nd, the afternoon sees a jump in energy with a 6ft north swell, a period of 7 seconds, and a combined energy of 263. It’s glassy, but the wave comment says it’s very ordinary. It’s a beach-and-reef setup, so with that much swell and poor quality, I’d say this is looking more interesting for kite surfing than paddle surfing.
Now, here’s the standout. Thursday the 3rd of September is the best morning on offer. Ruby Bay will see a solid 5ft north swell, with a period of 11 seconds – that’s a proper groundswell. The energy is strong at 536, and we’ve got light offshore winds from the SSW, which will keep the surface clean. The water temp is about 53°, which is a touch cooler than usual for this time of year, but nothing crazy. This is the one to mark on your calendar. The swell direction is north, and the optimum direction for this spot is also north, so it’s a perfect match. The only catch is that, because it’s a point break, a long-period swell like this can be a bit straight, but the quality should make up for it. It’s not massive, so it’s good for intermediate surfers.
The afternoon of that same day flips to an onshore NNE wind, so the morning window is your only chance. After that, it fades back into small stuff. So, if you’re holding out for a proper session, Thursday morning the 3rd is your only true hero wave. The rest of the window is a story of patience.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Sat night. Very mild (max 14°C on Sat morning, min 5°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun morning. Very mild (max 16°C on Tue afternoon, min 7°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | NW 15 | NW 15 | N 14 | N 16 | N 16 | N 15 | N 6 | NNW 5 | NNW 6 | NNW 9 | N 18 | NW 12 | NNW 15 | NW 15 | NNW 15 | N 7 | NW 6 | NNW 5 | NW 5 | NNW 6 | N 6 |
Wave Graph | |||||||||||||||||||||
0 | 0 | 4 | 5 | 5 | 4 | 1 | 16 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 1 | 90 | 0 | 41 | 0 | 33 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | off | off | cross-on | off | off | glassy | cross-on | off | cross-off | off | off | cross-off | off | cross-off | cross-off | off | glassy | glassy | on |
High Tide | 2:52PM3.45m | 3:25AM3.25m | 3:40PM3.24m | 4:28AM3.05m | 4:51PM3.08m | 5:47AM2.97m | 6:38PM3.06m | 7:06AM3.04m | 7:58PM3.23m | 8:06AM3.21m | 8:46PM3.45m | 8:53AM3.41m | 9:23PM3.67m | ||||||||
Low Tide | 8:40PM1.63m | 9:18AM1.61m | 9:59PM1.84m | 10:19AM1.77m | 11:37PM1.89m | 11:37AM1.83m | 00:53AM1.80m | 1:01PM1.75m | 1:49AM1.65m | 2:08PM1.54m | 2:33AM1.47m | 2:57PM1.28m | |||||||||
7:11 | — | — | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | |
— | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — | |
mm | — | — | — | — | — | — | — | — | 6 | 1 | — | — | — | — | — | — | — | — | — | 3 | 4 |
Temp °C | 11 | 10 | 7 | 11 | 13 | 6 | 14 | 14 | 12 | 13 | 12 | 10 | 14 | 15 | 8 | 15 | 16 | 10 | 13 | 14 | 13 |
Feels °C | 9 | 7 | 5 | 10 | 11 | 3 | 12 | 13 | 12 | 8 | 7 | 5 | 10 | 12 | 4 | 12 | 13 | 7 | 12 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | NW 15 | NW 15 | NW 4 | — | N 16 | NNW 4 | NNW 4 | — | — | N 9 | NNW 9 | N 8 | N 7 | NNW 7 | NNW 15 | NW 4 | NNW 5 | NNW 5 | NNW 5 | NNW 6 | N 6 |
8 | 8 | 1 | — | 5 | 4 | 7 | — | — | 339 | 211 | 42 | 28 | 17 | 22 | 7 | 23 | 9 | 8 | 59 | 33 | |
Swell 2 Height (m) Direction Period (s) | — | — | N 14 | N 16 | — | N 15 | N 6 | — | — | NW 17 | N 18 | NNW 9 | NNW 15 | NW 15 | NNW 4 | NNW 15 | NW 15 | NW 14 | NW 14 | NW 14 | NW 14 |
— | — | 4 | 5 | — | 4 | 1 | — | — | 11 | 6 | 26 | 93 | 59 | 2 | 23 | 9 | 8 | 8 | 8 | 8 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NW 12 | — | — | NNW 7 | N 7 | — | — | — | — | N 19 |
— | — | — | — | — | — | — | — | — | — | — | 36 | — | — | 4 | 1 | — | — | — | — | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 2 | — | — | WSW 3 | NNW 5 | NNW 6 | NNW 9 | — | — | — | — | WSW 2 | NW 6 | NW 6 | — | NW 5 | NNW 6 | — |
— | — | — | 1 | — | — | 1 | 16 | 201 | 905 | — | — | — | — | 1 | 51 | 90 | — | 41 | 202 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 83 | 137 | 83 | 83 | 83 | 83 | 83 | 115 | 129 | 125 | 133 | 115 | 14 | 83 | 83 | 14 | 14 | 83 | 14 | 14 | 116 |
Best forecast wave conditions in Nelson - Tasman Bay | |||||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Ruby Bay Surf forecast
The above surf forecast table for Ruby Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ruby Bay can be found by selecting the local surf guide option on the grey menu. Our Ruby Bay 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 (Ruby Bay) 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 Ruby Bay 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 Nelson - Tasman Bay? If you are looking for accommodation near Ruby Bay, camping, hotels and holiday cottages in Nelson - Tasman Bay, consider staying in Nelson which is 17 km (11 miles) away. Alternatively, find information about places to stay and car hire in Blenheim which is 80 km (50 miles) away











