Surf Forecasts:
Ruby Bay surf forecast from 19 Aug 2026:
- Most powerful swell: Sunday 23 Aug, 12PM (local time) - 2.5ft (0.8m), 8s period, N swell with 74 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 0.8m 8s and forecast to arrive on Sunday (Aug 23) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 7s period and expected on Sunday (Aug 23) at 12AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Sun 23rd Aug) | 2.5ft (0.8m) 8s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what’s coming up for Ruby Bay over the next couple of weeks.
Honestly, it’s a tough stretch. The forecast is pretty barren for the most part. Ruby Bay is a sheltered point break that rarely breaks, and this outlook shows why. The next two weeks are filled with days where the swell just isn’t showing up, or it’s tiny and weak. You’re looking at a long gap of nothing from now until the very end of August. Most mornings are glassy, but with zero to 0.3 ft of swell, it’s a lake.
The first real pulse of energy arrives on Friday, August 28th, but it’s not the kind of surf you want to get excited about. The morning sees a 6 ft swell from the north, with a period of 9 seconds. The combined energy is strong (556), but it’s coming in with a moderate cross-onshore wind from the NNE at 15 mph. That’s going to make it a choppy, messy affair. This size is pushing into the expert-only zone, and with the wind howling, it’s probably more interesting for a kite surfer than a paddle surfer. The afternoon is a little smaller at 5 ft, but still messy.
After that, the swell drops back down. There’s a small window on Sunday, August 30th, with a 6 ft north swell in the afternoon, but again, it’s onshore wind and the wait is likely not worth it.
The only other standout, if you can call it that, is the morning of Monday, August 31st. The swell is 3 ft from the north, period 8 seconds, with a glassy, clean surface. The wind is a slight air from the SSW. The wave energy is moderate (113). It’s small, but it will be the cleanest surf of the whole run. For a beginner, this is your best bet. The water temp is about 53°, which is within a degree of normal for this time of year, so nothing unusual there.
Honestly, it’s a quiet period. If you’re desperate, wait for that glassy 3 ft on the 31st. Otherwise, the forecasts can change, so keep your fingers crossed.
Rusty.
Short Range ForecastMostly dry. Very mild (max 12°C on Fri morning, min 5°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sat afternoon. Very mild (max 17°C on Mon afternoon, min 8°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 17 | NE 4 | NW 16 | NW 15 | NW 15 | N 14 | N 16 | N 16 | N 15 | NNW 4 | NNW 5 | N 19 | N 7 | N 18 | N 7 | NNW 7 | NNW 15 | NNW 15 | NW 15 | NW 5 | N 5 |
Wave Graph | |||||||||||||||||||||
0 | 1 | 0 | 0 | 0 | 4 | 5 | 5 | 4 | 0 | 32 | 7 | 66 | 6 | 20 | 0 | 0 | 0 | 0 | 0 | 4 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | off | glassy | on | off | off | cross-on | off | cross-off | glassy | glassy | off | cross-off | glassy | glassy | cross-off | off | off | off | glassy |
High Tide | 2:12PM3.65m | 2:35AM3.50m | 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 | ||||||||
Low Tide | 7:51PM1.36m | 8:28AM1.40m | 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 | ||||||||
7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | |
— | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 4 | 2 | — | — | — | — | — | — | — | — | 1 |
Temp °C | 11 | 11 | 8 | 11 | 11 | 7 | 12 | 12 | 6 | 12 | 9 | 12 | 15 | 16 | 10 | 16 | 17 | 9 | 16 | 16 | 12 |
Feels °C | 9 | 8 | 6 | 9 | 8 | 5 | 11 | 9 | 3 | 10 | 8 | 10 | 11 | 12 | 8 | 12 | 13 | 6 | 13 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | NW 17 | NW 16 | — | NW 4 | — | NNW 4 | NW 4 | NNW 4 | NNW 4 | NNW 4 | — | NNW 6 | N 7 | NNW 8 | N 7 | NNW 7 | NNW 5 | NNW 4 | NNW 6 | NW 5 | N 5 |
11 | 10 | — | 1 | — | 2 | 1 | 3 | 3 | 7 | — | 90 | 66 | 60 | 14 | 26 | 11 | 2 | 3 | 11 | 4 | |
Swell 2 Height (m) Direction Period (s) | — | NW 5 | NW 16 | NW 15 | NW 15 | N 14 | N 16 | N 16 | N 15 | — | — | NW 12 | NW 17 | N 18 | NW 16 | NNW 16 | NNW 7 | NNW 6 | NW 15 | NW 15 | NW 4 |
— | 1 | 10 | 8 | 8 | 4 | 5 | 5 | 4 | — | — | 6 | 11 | 6 | 10 | 25 | 9 | 4 | 9 | 9 | 3 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | N 19 | — | — | — | — | NNW 15 | NNW 15 | — | — | NW 14 |
— | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — | 23 | 22 | — | — | 8 | |
Wind waves Height (m) Direction Period (s) | — | NE 4 | — | SSW 2 | — | — | — | NW 4 | — | — | NNW 5 | NW 7 | — | — | NW 4 | WSW 2 | — | SW 2 | WSW 2 | — | — |
— | 1 | — | 1 | — | — | — | 4 | — | — | 32 | 314 | — | — | 20 | 1 | — | 2 | 1 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 83 | 83 | 83 | 83 | 88 | 83 | 83 | 83 | 83 | 83 | 129 | 14 | 115 | 115 | 30 | 14 | 115 | 83 | 83 | 115 | 129 |
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











