Surf Forecasts:
Ruby Bay surf forecast from 15 Aug 2026:
- Most powerful swell: Saturday 22 Aug, 3PM (local time) - 3ft (0.9m), 5s period, NW swell with 49 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 0.9m 5s and forecast to arrive on Saturday (Aug 22) at 3PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Aug 16) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Sat 22nd Aug) | 3ft (0.9m) 5s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's talk about what's on the menu for Ruby Bay.
Right off the bat, I've got to be straight with you: this is a tough stretch. The whole 16-day window is looking pretty grim for Ruby Bay. It's a sheltered point break that rarely breaks anyway, and unfortunately, that's the story here. You'll be looking at a long stretch of nothing much.
The water is sitting at 53°F, which is a little under two degrees Fahrenheit cooler than usual for this time of year – nothing too wild, just a bit nippy.
Let's start from the beginning. From Saturday the 15th of August all the way through the morning of Sunday the 23rd, it's a dead loss. We're talking a full 8 days of no surf to speak of, with tiny, weak swells that don't have any energy. The swell energy is a measly 1 (1) for most of that time, and even when it climbs a bit, it's still just a rippled pond. The wind is often offshore or glassy, which is normally a good sign, but there's just no swell to work with. It's a frustrating wait.
Then, on the morning of Sunday the 23rd of August, things get a little interesting, but not in a good way for a paddle surfer. We've got a swell of about 5ft coming from the north with a 8-second period. The combined energy climbs to 252 (252), which is moderate, but it's accompanied by light rain. The waves are surfable, but the conditions are "very ordinary" as the data says. It's a beach-and-reef setup, so with a bit of size and poor quality, this might be more for the kite surfers than us.
After that, it's back to the desert. From Monday the 24th through to the morning of Friday the 28th of August, we're scraping the bottom of the barrel again. A few tiny pulses of swell, but nothing that would even get you out of bed. The energy is low, barely cracking 100 (100) on the rare occasions it's there.
Now, the only real standout in the whole 16 days is the morning of Saturday the 29th of August. I'm talking about it now because it's a week and a half away. The forecast shows a swell of about 5ft from the north-northwest with a solid 11-second period. The combined energy is a strong 517 (517). The wind is a light cross-offshore from the south-southwest, which should keep the surface clean. The data says "expect good surf conditions." This is the one. It's a promising window, but keep in mind it's a long-range call, so don't book the day off work just yet. The only downside is that for a point break like Ruby Bay, a 5ft north-northwest swell with a longer period could be a bit big for beginners, and it might be a bit fat and close out. But for anyone with a bit of experience, it's the best chance we've got.
The morning of Sunday the 30th of August does have glassy conditions and a clean look, but the swell drops back to about 2ft from the north, with only 80 (80) energy. It's a tease.
So, bottom line: this is a tough 16 days for Ruby Bay. The only real hope is that Saturday the 29th of August morning window. Everything else is a write-off. Keep your eye on that date, and check the forecast closer to the time. As always, things can change.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sat night. Very mild (max 15°C on Sat morning, min 2°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 14°C on Tue afternoon, min 3°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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) | N 7 | N 7 | NNW 16 | NNW 16 | NNW 15 | NNW 16 | NW 15 | NE 4 | NW 15 | NW 14 | NW 14 | NW 15 | NW 17 | NW 16 | NW 16 | NW 15 | NNW 3 | N 14 | N 16 | N 4 | N 15 |
Wave Graph | |||||||||||||||||||||
1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 5 | 1 | 4 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | on | cross-off | off | cross-off | off | off | cross-on | off | off | glassy | off | glassy | on | off | glassy | on | off | off | glassy | off |
High Tide | 11:46AM4.21m | 00:01AM4.32m | 12:24PM4.15m | 00:38AM4.17m | 1:00PM4.02m | 1:15AM3.98m | 1:36PM3.85m | 1:54AM3.75m | 2:12PM3.65m | 2:35AM3.50m | 2:52PM3.45m | 3:25AM3.25m | 3:40PM3.24m | ||||||||
Low Tide | 5:37PM0.60m | 5:54AM0.57m | 6:10PM0.70m | 6:30AM0.73m | 6:41PM0.86m | 7:07AM0.95m | 7:14PM1.09m | 7:46AM1.17m | 7:51PM1.36m | 8:28AM1.40m | 8:40PM1.63m | 9:18AM1.61m | 9:59PM1.84m | ||||||||
7:18 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | |
— | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | |
mm | — | — | 10 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 10 | 10 | 11 | 5 | 9 | 9 | 3 | 12 | 14 | 6 | 12 | 12 | 7 | 10 | 10 | 7 | 13 | 15 | 8 |
Feels °C | 14 | 13 | 9 | 6 | 7 | 1 | 6 | 5 | 0 | 9 | 12 | 3 | 10 | 9 | 5 | 8 | 8 | 5 | 11 | 13 | 5 |
Swell 1 Height (m) Direction Period (s) | NNW 17 | NNW 16 | NNW 16 | NNW 16 | NNW 15 | NNW 16 | NW 15 | NW 15 | NW 15 | NW 14 | NW 14 | — | NW 17 | NW 16 | — | NW 15 | NW 15 | NNW 4 | NNW 4 | N 4 | NNW 4 |
28 | 26 | 26 | 25 | 23 | 24 | 9 | 9 | 8 | 8 | 8 | — | 11 | 10 | — | 8 | 8 | 3 | 2 | 1 | 6 | |
Swell 2 Height (m) Direction Period (s) | N 7 | — | — | — | — | ENE 4 | — | — | — | — | — | NW 4 | — | — | NW 16 | — | — | N 14 | — | NW 4 | N 15 |
1 | — | — | — | — | 2 | — | — | — | — | — | 1 | — | — | 10 | — | — | 4 | — | 1 | 4 | |
Swell 3 Height (m) Direction Period (s) | — | N 7 | — | — | — | — | — | — | — | — | — | NW 15 | — | — | — | — | — | — | N 16 | N 6 | — |
— | 1 | — | — | — | — | — | — | — | — | — | 8 | — | — | — | — | — | — | 5 | 1 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | SSW 3 | S 3 | SSE 3 | — | NE 4 | — | — | — | — | — | — | — | — | NNW 3 | — | — | — | WSW 2 |
— | — | — | 8 | 1 | 2 | — | 1 | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 83 | 85 | 88 | 85 | 85 | 83 | 83 | 137 | 83 | 83 | 169 | 83 | 83 | 88 | 83 | 83 | 83 | 83 | 83 | 83 | 83 |
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











