Surf Forecasts:
Ruby Bay surf forecast from 25 Jul 2026:
- Most powerful swell: Friday 31 Jul, 12PM (local time) - 6.5ft (2.0m), 9s period, N swell with 609 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 2.0m 9s and forecast to arrive on Friday (Jul 31) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Friday (Jul 31) at 3PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Fri 31st Jul) | 6.5ft (2.0m) 9s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Righto, folks, Rusty here. I'm looking at the charts for Ruby Bay, and straight up, this is a tough one. The forecast is a long, flat, and frustrating stretch with barely a ripple to get excited about. We're talking a solid 16-day window with hardly a wave worth paddling for.
Ruby Bay is a super sheltered spot, and it rarely breaks. The water's a bit colder than normal for this time of year, sitting at 53°F.
Looking at the first week, there's absolutely nothing on offer. Saturday the 25th of July has a tiny 2ft swell from the north, but it's weak, only 45 on the combined energy scale, and it gets marked as poor surf. The whole first week is a write-off – tiny, weak swells, or just flatness. The wind does go glassy or light offshore on a few mornings, but there's no swell to work with.
We get a slight pulse of energy on Friday the 31st of July. The swell jumps to 7ft from the north, with a combined energy of 597, which is moderate. But the wind is a cross-onshore breeze at 9 mph, and it's raining. For a rare-breaking point like Ruby Bay, that's a messy, blown-out mess. It's also over 8ft, so it's only for experts anyway.
The second week is just as bleak. There's a tiny bump on Sunday the 2nd of August, with a 3ft north swell pushing 157 on the energy scale, but it's still labeled poor surf. The rest of the window is dominated by absolutely nothing, or tiny, low-energy pulses of 0.3ft. The longest gap of no surf at all is from the 5th right through to the 9th of August.
Honestly, there's no standout here. Not a single day that makes me want to load the boards. The best you could hope for is to sit on the beach and watch the odd little ripple, but there's nothing to ride. For a spot that's already inconsistent, this flat run is pretty normal. The forecasts can change, but right now, it's a solid no-go.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat night. Very mild (max 11°C on Sat afternoon, min 2°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 37mm), heaviest during Fri morning. Very mild (max 13°C on Thu afternoon, min 4°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
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 15 | NNW 14 | NNW 14 | NNW 14 | NNW 13 | N 12 | NNW 7 | N 11 | N 6 | N 6 | N 3 | N 4 | NNW 5 | NW 5 | N 5 | N 7 | N 8 | N 9 | N 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 45 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 2 | 1 | 1 | 1 | 6 | 0 | 49 | 24 | 123 | 597 | 509 | 201 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | glassy | on | cross-off | off | on | off | off | on | off | glassy | glassy | off | glassy | glassy | glassy | cross-on | cross-on | on |
High Tide | 7:15PM3.28m | 7:30AM3.18m | 8:20PM3.44m | 8:27AM3.28m | 9:06PM3.61m | 9:14AM3.43m | 9:44PM3.76m | 9:55AM3.59m | 10:19PM3.89m | 10:33AM3.72m | 10:53PM4.00m | 11:11AM3.81m | 11:26PM4.08m | |||||||
Low Tide | 1:19AM1.70m | 1:26PM1.67m | 2:11AM1.58m | 2:24PM1.55m | 2:53AM1.45m | 3:15PM1.37m | 3:29AM1.31m | 3:58PM1.17m | 4:03AM1.18m | 4:34PM0.99m | 4:37AM1.06m | 5:07PM0.85m | ||||||||
 |  | | |  |  | | | | | | | | |  | |  |  | |  | |
 | — | — | 7:41 | — | — | 7:39 | — | — | 7:39 | — | — | 7:37 | — | — | 7:37 | — | — | 7:35 | — | — |
 | 5:25 | — | — | 5:27 | — | — | 5:28 | — | — | 5:28 | — | — | 5:29 | — | — | 5:30 | — | — | 5:30 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 29 | 16 | 29 |
Temp °C | 11 | 5 | 8 | 9 | 5 | 9 | 9 | 5 | 10 | 10 | 6 | 9 | 10 | 7 | 10 | 13 | 11 | 12 | 12 | 12 |
Feels °C | 7 | 2 | 6 | 7 | 3 | 7 | 6 | 3 | 8 | 7 | 4 | 7 | 8 | 5 | 9 | 12 | 8 | 10 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | N 8 | NNW 15 | NE 4 | NNW 8 | NNW 7 | NNW 9 | NNW 8 | NNW 7 | N 6 | N 6 | N 6 | N 3 | N 4 | NNW 5 | NNW 5 | NW 17 | — | — | N 9 | N 8 |
| kJ | 45 | 125 | 4 | 6 | 5 | 7 | 6 | 5 | 1 | 1 | 1 | 1 | 5 | 13 | 17 | 11 | — | — | 509 | 201 |
Swell 2 Height (m) Direction Period (s) | NNW 15 | — | NNW 9 | ENE 4 | NNW 14 | NNW 13 | N 12 | NW 12 | N 11 | — | — | NW 6 | N 15 | NW 14 | NE 6 | — | — | — | NW 16 | NW 15 |
| kJ | 146 | — | 15 | 1 | 20 | 16 | 3 | 5 | 2 | — | — | 1 | 4 | 8 | 1 | — | — | — | 10 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | NNW 14 | NNW 14 | — | — | NW 12 | — | — | — | — | NW 11 | — | — | N 14 | — | — | — | — | — |
| kJ | — | — | 21 | 20 | — | — | 6 | — | — | — | — | 5 | — | — | 4 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | WSW 3 | — | — | — | SSW 2 | — | — | — | — | — | — | NNW 4 | — | NW 5 | N 5 | N 7 | N 8 | NNW 9 | — |
| kJ | 3 | 1 | — | — | — | 1 | — | — | — | — | — | — | 6 | — | 49 | 24 | 123 | 597 | 976 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 14 | 83 | 38 | 38 | 38 | 83 | 83 | 83 | 83 | 83 | 83 | 88 | 83 | 14 | 125 | 14 | 129 | 88 | 15 |
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
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