
Surf Forecasts:
Ruby Bay surf forecast from 5 Aug 2026:
- Best quality surf: Sunday 9 Aug, 6AM (local time) - 7ft (2.2m), 9s period, N swell with offshore winds.
- Most powerful swell: Sunday 9 Aug, 6AM (local time) - 7ft (2.2m), 9s period, N swell with 736 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 6AM (local time) - 7ft (2.2m), 9s 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 Sunday (Aug 09) at 6AM. The primary swell is predicted to be 2.2m and 9s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Ruby Bay in the next 16 days are 2.2m 9s and forecast to arrive on Sunday (Aug 09) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 10s period and expected on Sunday (Aug 09) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 9th Aug) | 7ft (2.2m) 9s |
| Best Surf | 6AM (Sun 9th Aug) | 7ft (2.2m) 9s |
| Most Powerful | 6AM (Sun 9th Aug) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Ruby Bay over the next 16 days.
The Lowdown
G’day surfers, Rusty here. Let’s have a look at what’s cookin’ over the next couple of weeks for Ruby Bay. I gotta be straight with you, it’s a long stretch of quiet, with just one moment that might get the heart pumping. Ruby Bay is a sheltered point break, a beginner-friendly spot that rarely breaks, so this dry spell isn’t a huge shock. The water temp is sitting at 53°, about 2° colder than the seasonal norm – a bit nippier than usual for this time of year, so you’ll be reaching for a thicker wetsuit or booties if you’re heading out.
We start off in a bit of a lull. From Thursday the 6th right through to Saturday the 8th, there’s virtually nothing happening. The surf is tiny, flat, or just unrideable – we’re talking waves around 0.3 ft to 2 ft with weak, short-period energy. The combined swell energy is only registering between 0 and 24 (very weak). Winds are mostly glassy or slight offshores, but with no swell to work with, it’s just a pretty picture on flat water.
The first real glimmer of hope arrives on Sunday the 9th of August. The morning shows a pulse of 5 ft swell from the north, with a period of 10 seconds and a combined energy of 482 (moderate). It’s a long-period groundswell, which usually means better-shaped waves and longer lulls between sets. The wind is offshore from the WSW, so expect clean, peeling lines. This is a rare breakout for Ruby Bay, but it’s small enough for beginners to handle. The afternoon sees the swell drop to 4 ft with a cross-on wind that messes it up a bit, so the morning window is your shot.
After Sunday, the week goes quiet again from Monday the 10th to Thursday the 13th. Gaps of days with tiny or no swell – most readings show combined energy under 100, with only 2 ft to 3 ft waves and short periods. There’s glassy conditions here and there, but nothing worth paddling out for.
Then on Friday the 14th of August, something bigger but messy shows up. The swell jumps to 6 ft in the morning and 7 ft in the afternoon from the north, with period of 9 seconds and combined energies of 516 and 718 (moderate to strong). The wind is cross-on from the NNE and E, creating choppy, bumpy conditions. This is getting into the range for experienced surfers, but the quality is poor – more of a challenge than a treat.
Now, here’s the real standout: Saturday the 15th of August morning. The swell is 5 ft from the north, period 12 seconds, and the combined energy is 746 (strong). That’s a solid, long-period groundswell that will wrap nicely around the point. Winds are offshore from the SW, meaning glassy, clean faces. The water temp is still cold. This is the best on offer – a proper session for those who can handle a head-high wave. It’s a rare break, so don’t expect crowds, but it can get busy sometimes. The afternoon flat-lines again.
After that, it’s back to a desert. From Sunday the 16th all the way to Friday the 21st, there’s no swell to speak of – most entries show flat ocean, glassy or light winds, and combined swell energy at 0. We’ve got a gap of about six days with no recommendations. The only blip is on Wednesday the 19th morning with a tiny 0.3 ft, 14-second swell that’s too weak to surf.
Final word: Sunday the 9th morning and Saturday the 15th morning are your windows. The 15th is the better bet for quality and power. Don’t hold your breath for anything else.
Stay salty,
Rusty
Short Range ForecastHeavy rain (total 30mm), heaviest during Sat night. Very mild (max 11°C on Sat afternoon, min 3°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Very mild (max 13°C on Sun afternoon, min 5°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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 12 | N 12 | N 11 | N 11 | NNW 11 | N 5 | N 5 | NNW 5 | N 6 | N 10 | N 10 | N 9 | N 8 | N 8 | N 9 | N 9 | N 9 | N 7 | N 7 | N 6 | NNW 6 |
Wave Graph | |||||||||||||||||||||
3 | 3 | 3 | 3 | 0 | 0 | 0 | 24 | 104 | 482 | 312 | 139 | 0 | 50 | 83 | 81 | 76 | 62 | 55 | 34 | 70 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | on | off | off | glassy | glassy | glassy | glassy | cross-on | off | cross-on | off | glassy | glassy | cross-off | cross-off | glassy | glassy | glassy | glassy | off |
High Tide | 3:01PM3.53m | 3:32AM3.55m | 3:56PM3.38m | 4:39AM3.42m | 5:21PM3.27m | 5:58AM3.39m | 7:11PM3.37m | 7:18AM3.49m | 8:26PM3.68m | 8:29AM3.68m | 9:19PM4.01m | 9:29AM3.89m | 10:04PM4.25m | ||||||||
Low Tide | 9:00PM1.36m | 9:24AM1.34m | 10:21PM1.49m | 10:36AM1.47m | 11:48PM1.47m | 12:01PM1.48m | 1:05AM1.32m | 1:27PM1.35m | 2:11AM1.08m | 2:38PM1.11m | 3:06AM0.82m | 3:34PM0.87m | |||||||||
7:30 | — | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | |
— | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | |
mm | — | — | — | — | — | 1 | — | — | 29 | — | — | — | — | — | — | — | 1 | 5 | — | — | — |
Temp °C | 8 | 9 | 5 | 8 | 10 | 9 | 10 | 11 | 11 | 12 | 13 | 8 | 12 | 12 | 7 | 10 | 9 | 9 | 13 | 14 | 9 |
Feels °C | 6 | 6 | 3 | 5 | 8 | 7 | 9 | 10 | 8 | 11 | 11 | 6 | 11 | 10 | 5 | 8 | 8 | 8 | 12 | 14 | 7 |
Swell 1 Height (m) Direction Period (s) | N 12 | N 12 | — | — | NNW 4 | N 5 | N 5 | NNW 8 | — | N 10 | N 10 | N 9 | N 8 | N 8 | N 9 | N 9 | N 9 | N 7 | N 7 | NNW 12 | N 7 |
3 | 3 | — | — | 7 | 11 | 19 | 13 | — | 482 | 312 | 139 | 71 | 50 | 83 | 81 | 76 | 62 | 55 | 60 | 52 | |
Swell 2 Height (m) Direction Period (s) | N 12 | N 12 | N 11 | N 11 | NNW 11 | NNW 10 | NNW 8 | — | — | — | NW 18 | NW 16 | NW 16 | NW 15 | ESE 2 | — | ENE 4 | N 8 | NW 13 | N 8 | NNW 13 |
3 | 3 | 3 | 3 | 11 | 9 | 14 | — | — | — | 12 | 10 | 10 | 9 | 1 | — | 1 | 6 | 7 | 10 | 92 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | N 11 | — | WNW 4 | — | — | — | — | NW 15 | — | — | — | NW 15 | — | NW 20 | NW 18 | N 18 | — | — |
— | — | — | 2 | — | 2 | — | — | — | — | 9 | — | — | — | 8 | — | 15 | 13 | 6 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | NNW 5 | N 6 | NNW 10 | — | — | — | — | SE 2 | — | — | — | — | N 6 | NNW 6 |
— | — | — | — | — | — | — | 24 | 104 | 1102 | — | — | — | — | 1 | — | — | — | — | 34 | 70 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 83 | 88 | 83 | 83 | 83 | 83 | 38 | 83 | 129 | 0 | 24 | 7 | 14 | 21 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
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











