Surf Forecasts:
Ruby Bay surf forecast from 31 Jul 2026:
- Best quality surf: Thursday 6 Aug, 9PM (local time) - 6ft (1.8m), 8s period, N swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 9PM (local time) - 6ft (1.8m), 8s period, N swell with 422 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 6PM (local time) - 6ft (1.8m), 7s period with N swell.
Best Forecast Surf Conditions for Ruby Bay this week:
The surf forecast for Ruby Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 06) at 6PM. The primary swell is predicted to be 1.8m and 7s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ruby Bay in the next 16 days are 1.8m 8s and forecast to arrive on Thursday (Aug 06) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 8s period and expected on Friday (Aug 07) at 3AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 6th Aug) | 6ft (1.8m) 7s |
| Best Surf | 9PM (Thu 6th Aug) | 6ft (1.8m) 8s |
| Most Powerful | 9PM (Thu 6th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Alright, this is Rusty, and I gotta be straight with you – it's a pretty grim picture for the next couple of weeks here at Ruby Bay. This is a point break that's sheltered and rarely breaks, so when it's flat, it's flat. And we're looking at a long, dry spell.
We’ve got a small pulse of northerly swell coming in on Friday, July 31st, with a combined energy of just 72 (weak). You’re looking at a 3 ft swell from the north at a short 8-second period, and with a cross-offshore wind, it’s not doing us any favours. The water temp is sitting at 53°F, which is about 1°F cooler than average for this time of year, so nothing too unusual there.
After that, the forecast drops off a cliff. From Saturday, August 1st right through to the morning of Friday, August 7th, there’s effectively nothing. A whole week of flat, glassy conditions with no swell to speak of. The energy values are all in the single digits or zero – it’s just a lake out there.
We finally see a bit of life on the morning of Friday, August 7th. A north swell of 4 ft with an 8-second period rolls in, giving us a moderate combined energy of 213. The wind is light and offshore from the SSW, so it’ll be clean. The guide says the surf is "surfable waves but very ordinary conditions," so I’d give it a 1/10. It’s not good, but it’s something to paddle out for if you're desperate. The afternoon glass-off with a 4 ft north swell and 142 energy is a maybe, but still nothing to write home about. The crowd potential here is "sometimes," so on a Friday you might have a few others with the same idea.
After that, it’s back to flat or near-flat conditions for the rest of the window. The only other tiny blip is on Saturday, August 15th, with a 2 ft north swell and a 10-second period, giving us a weak 90 energy. The morning is offshore and clean, but it’s barely a ripple.
So, to be honest, there’s no standout session here. The best on offer is the morning of August 7th, but even that’s just a "meh" kind of wave. The rest of the 16 days is a total write-off for Ruby Bay. When it’s this inconsistent, a blank run like this is just normal for the area. Keep an eye on the forecasts, though – things can change.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri afternoon. Very mild (max 14°C on Mon morning, min 2°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 13°C on Mon afternoon, min 4°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Fri 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | ||||||||||||||
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) | N 8 | NNW 14 | NNW 7 | NNW 7 | N 7 | N 6 | N 6 | N 21 | N 7 | NW 18 | NW 17 | NW 16 | ENE 3 | NW 15 | N 14 | N 13 | N 13 | N 12 | N 6 | N 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 72 | 0 | 0 | 0 | 1 | 1 | 1 | 9 | 1 | 0 | 0 | 0 | 1 | 0 | 4 | 3 | 3 | 3 | 86 | 291 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | glassy | off | off | cross-on | off | off | off | off | cross-off | on | on | glassy | cross-on | off | glassy | on | off |
High Tide | 11:26PM4.08m | 11:48AM3.84m | 00:00AM4.12m | 12:25PM3.84m | 00:35AM4.10m | 1:02PM3.81m | 1:11AM4.02m | 1:39PM3.75m | 1:51AM3.89m | 2:18PM3.66m | 2:37AM3.72m | 3:01PM3.53m | ||||||||
Low Tide | 5:07PM0.85m | 5:11AM0.95m | 5:38PM0.78m | 5:47AM0.88m | 6:10PM0.79m | 6:22AM0.86m | 6:42PM0.87m | 7:00AM0.90m | 7:19PM1.00m | 7:40AM1.01m | 8:02PM1.17m | 8:27AM1.17m | 9:00PM1.36m | |||||||
 |  |  | | | | | |  |  |  | | | | | | | | | | |
 | — | — | 7:35 | — | — | 7:33 | — | — | 7:33 | — | — | 7:31 | — | — | 7:31 | — | — | 7:30 | — | — |
 | 5:30 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 10 | 6 | 9 | 11 | 5 | 10 | 12 | 8 | 14 | 13 | 9 | 11 | 10 | 9 | 9 | 9 | 6 | 9 | 9 | 6 |
Feels °C | 6 | 3 | 5 | 8 | 2 | 7 | 9 | 4 | 10 | 10 | 6 | 9 | 7 | 7 | 7 | 6 | 4 | 7 | 6 | 4 |
Swell 1 Height (m) Direction Period (s) | N 8 | NNW 8 | NNW 7 | NNW 7 | NE 4 | — | N 6 | — | NW 19 | NNW 4 | NNW 4 | NW 5 | NW 16 | NW 15 | N 14 | — | N 3 | N 4 | NNW 6 | — |
| kJ | 72 | 44 | 17 | 10 | 1 | — | 1 | — | 14 | 2 | 2 | 1 | 10 | 8 | 4 | — | 1 | 1 | 60 | — |
Swell 2 Height (m) Direction Period (s) | NNW 9 | NNW 14 | NNW 14 | NW 13 | N 7 | N 6 | — | N 21 | NW 4 | NW 18 | NW 17 | — | NW 5 | — | — | — | N 13 | N 12 | N 12 | — |
| kJ | 32 | 75 | 18 | 7 | 1 | 1 | — | 9 | 1 | 13 | 12 | — | 1 | — | — | — | 3 | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | NW 16 | — | — | — | — | NW 4 | NW 12 | — | N 7 | — | NW 10 | NW 16 | — | — | NW 18 | N 13 | — | — | — | — |
| kJ | 10 | — | — | — | — | 1 | 5 | — | 1 | — | 4 | 10 | — | — | 12 | 3 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | SSW 2 | — | — | SW 3 | — | SW 2 | W 3 | WSW 3 | — | — | ENE 3 | — | — | — | — | — | N 6 | N 8 |
| kJ | 3 | — | 1 | — | — | 2 | — | 1 | 2 | 2 | — | — | 1 | — | — | — | — | — | 86 | 291 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 125 | 14 | 38 | 84 | 83 | 83 | 83 | 83 | 83 | 83 | 125 | 83 | 84 | 84 | 83 | 84 | 83 | 88 | 24 | 0 |
Best forecast wave conditions in Nelson - Tasman Bay | ||||||||||||||||||||
Best forecast wave conditions in New Zealand | ||||||||||||||||||||
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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
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