
Surf Forecasts:
Ruby Bay surf forecast from 3 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 3AM (local time) - 4ft (1.2m), 7s period, N swell with 139 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 1.2m 7s and forecast to arrive on Saturday (Aug 08) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Saturday (Aug 08) at 12AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3AM (Sat 8th Aug) | 4ft (1.2m) 7s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Alright, let's talk surf. Or, the lack of it. We've got a long, flat stretch ahead for Ruby Bay, so don't get too stoked just yet. The first week and a half is basically a write-off. You're looking at tiny dribbles and glassy mornings that are better for a paddle than a ride.
The first real sign of life pops up on Saturday the 9th. There's a small groundswell, maybe 2ft, but the energy is weak, just a blip on the radar. The wind is glassy though, so it'll be clean, but there's just no push. It's a "check it from the car" kind of day.
That fades fast, and we're back to flatness from the 10th through the 13th. Energy readings are in the dirt. Don't bother.
Now, for the one thing that stands out in this whole window: Tuesday afternoon, the 11th of August. The swell jumps to a solid 6-7ft from the north, with a 7-second period and a strong energy reading of 408. That's the most powerful swell we see. But, and there's always a but, the wind is cross-onshore from the east-southeast. That's going to chop it up. It might be a bit of a mess, but at a point break, you might find some shelter. It's the biggest option we've got, but it's not clean. If the wind was offshore, this would be the one. As it is, it's a maybe.
And that's it. From the 12th through the 19th, it's dead flat again. A few glassy moments will keep the water pretty, but there's no surf. There's a tiny, long-period swell (14 seconds) showing up on the 19th, but it's only a foot. A long period at a point can be nice, but not with no size.
So, the long and short of it is: this is a two-week period with very little to get excited about. The best bet, if you're desperate, is that Tuesday the 11th, but don't expect perfection. Water temp is about normal for this time of year. It's a frustrating run, but it happens. Forecasts change, so stay hopeful, but plan for flatness.
Rusty, out.
Short Range ForecastMostly dry. Very mild (max 11°C on Tue afternoon, min 2°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Very mild (max 11°C on Sun morning, min 3°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 17 | NW 16 | NW 16 | NW 15 | N 14 | NW 16 | N 13 | N 12 | N 12 | N 11 | N 11 | NW 4 | N 6 | N 7 | N 8 | N 8 | N 9 | N 8 | N 8 |
Wave Graph | |||||||||||||||||||
0 | 0 | 0 | 0 | 4 | 0 | 3 | 3 | 3 | 3 | 2 | 24 | 0 | 102 | 84 | 74 | 71 | 65 | 31 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | off | off | off | on | off | off | on | off | off | glassy | off | glassy | glassy | glassy | glassy | on | glassy |
High Tide | 1:11AM4.02m | 1:39PM3.75m | 1:51AM3.89m | 2:18PM3.66m | 2:37AM3.72m | 3:01PM3.53m | 3:32AM3.55m | 3:56PM3.38m | 4:39AM3.42m | 5:21PM3.27m | 5:58AM3.39m | 7:11PM3.37m | |||||||
Low Tide | 7:00AM0.90m | 7:19PM1.00m | 7:40AM1.01m | 8:02PM1.17m | 8:27AM1.17m | 9:00PM1.36m | 9:24AM1.34m | 10:21PM1.49m | 10:36AM1.47m | 11:48PM1.47m | 12:01PM1.48m | 1:05AM1.32m | |||||||
— | 7:31 | — | — | 7:31 | — | — | 7:30 | — | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | |
— | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 5 | — | — | — | — |
Temp °C | 9 | 10 | 11 | 4 | 8 | 8 | 4 | 8 | 9 | 4 | 8 | 10 | 8 | 10 | 10 | 9 | 11 | 11 | 9 |
Feels °C | 6 | 7 | 5 | -1 | 5 | 4 | 1 | 5 | 6 | 1 | 6 | 8 | 5 | 8 | 9 | 8 | 10 | 9 | 8 |
Swell 1 Height (m) Direction Period (s) | NNW 4 | NNW 4 | ENE 4 | NW 15 | N 14 | — | N 13 | N 12 | N 12 | — | NW 4 | NNW 4 | N 6 | N 7 | N 8 | N 8 | N 9 | N 8 | N 8 |
3 | 2 | 2 | 8 | 4 | — | 3 | 3 | 3 | — | 1 | 11 | 100 | 102 | 84 | 74 | 71 | 65 | 31 | |
Swell 2 Height (m) Direction Period (s) | NW 17 | ENE 5 | NW 16 | NW 5 | — | NW 13 | — | — | N 12 | — | N 11 | NW 11 | NNW 10 | NW 19 | — | NW 18 | — | NW 18 | E 3 |
12 | 3 | 10 | 1 | — | 7 | — | — | 3 | — | 2 | 5 | 19 | 14 | — | 13 | — | 12 | 1 | |
Swell 3 Height (m) Direction Period (s) | NW 11 | NW 16 | NW 6 | — | — | NW 16 | N 13 | N 12 | — | N 11 | — | — | — | — | — | — | NW 18 | — | NW 18 |
5 | 10 | 1 | — | — | 10 | 3 | 3 | — | 3 | — | — | — | — | — | — | 13 | — | 12 | |
Wind waves Height (m) Direction Period (s) | — | — | SSW 3 | SSW 3 | SSW 2 | — | — | — | — | — | — | NW 4 | — | — | — | — | — | — | — |
— | — | 3 | 4 | 1 | — | — | — | — | — | — | 24 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 142 | 83 | 88 | 83 | 83 | 88 | 83 | 83 | 88 | 83 | 83 | 83 | 14 | 14 | 14 | 14 | 14 | 21 | 30 |
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











