Ruby Bay Surf Break

Lat Long: 41.21° S 173.09° E

Ruby Bay Surf Forecast and Surf Report

Issued: 11 am 21 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ruby Bay sea temperature is
11.8° C
1.0° 

Ruby Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ruby Bay surf forecast from 21 Jul 2026:

  • Most powerful swell: Friday 24 Jul, 12PM (local time) - 5ft (1.6m), 7s period, N swell with 269 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 1.6m 7s and forecast to arrive on Friday (Jul 24) 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 1.8m 7s period and expected on Friday (Jul 24) at 6PM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful12PM (Fri 24th Jul)5ft (1.6m) 7s

Table - best surf conditions forecast for Ruby Bay over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s have a look at the next 16 days for Ruby Bay. Straight up, I gotta be honest with you – this is a tough stretch. There’s a long, quiet gap to start, so don’t bother paddling out just yet. We’re talking about a run of nearly two weeks with barely a ripple. The first week is pretty much a write-off; the swell is tiny and the energy is weak. It’s not until Friday, the 31st of July that we finally see something worth a look. Even then, the recommendation is thin.

Let’s get into it. For the first ten days or so, the swell heights hover under 2 feet and the combined energy is in the low single digits. It’s flat, mate. The water temperature is about 53°, which is a bit colder than normal for this time of year. You’ll be wearing more rubber than sunscreen.

The only real standout in this entire window is the morning of Saturday, the 1st of August. That’s the one. On this morning, we’ve got a 7 ft swell rolling in from the north with a very long period of 15 seconds. The combined energy is strong at 1689. The wind is glassy, with no breeze at all. This is a groundswell, so those long-period waves will have plenty of power and shape. Because Ruby Bay is a point break, the long period should actually work in its favour, giving you some nice, lined-up walls. It’s not for beginners though – 7 ft is solid and will have some punch.

Now, a couple of days before that, on the morning of Friday the 31st of July, you’ve got a 7 ft north groundswell as well, with a period of 10 seconds. Combined energy is 873, and the wind is glassy again. That morning is a decent option, but the Saturday is the standout.

A word on crowds – this break is listed as “sometimes” busy, so on a day like that Saturday, especially with clean, glassy conditions, you might have some company. But for a spot that rarely breaks, this is a rare chance.

After that Saturday morning, the swell drops away fast. By the afternoon the conditions turn ordinary, and by the 2nd of August, we’re back to nothing. The rest of the forecast is flat or tiny.

So here’s the takeaway: If you’ve got the patience, pencil in the morning of Saturday, the 1st of August. The north swell with that long period and glassy wind is the best you’ll see. Don’t expect much else.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Thu night. Very mild (max 12°C on Tue afternoon, min 5°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 26mm), heaviest during Sat night. Very mild (max 12°C on Fri afternoon, min 1°C on Sun night). Wind will be generally light.

Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.1
N
11
0.1
N
11
0.1
N
10
0.1
N
16
0.1
N
10
0.1
N
8
0.1
N
7
0.6
NW
4
1.1
NW
5
1.6
N
7
1.4
N
7
0.9
N
7
0.5
N
8
0.8
NNW
15
0.4
ENE
3
0.4
SE
3
0.2
N
7
0.2
NNW
13
0.1
N
13
0.2
NNW
8
0.1
NW
12
Wave Graph
Metric surfscale
Energy kJ
2
2
2
5
2
1
1
11
69
257
199
83
30
0
3
4
4
0
3
0
0
Wind (km/h)
5
SSW
5
NNW
10
SW
5
SW
10
NE
5
SW
5
SW
5
ENE
0
SW
10
NW
15
N
5
WSW
20
SW
15
SW
0
SW
10
SSW
5
ESE
10
SW
5
SW
5
NE
5
S
Wind State
off
glassy
off
off
on
off
glassy
glassy
glassy
cross
cross-on
cross-off
off
off
glassy
cross-off
cross
off
glassy
glassy
glassy
High Tide
2:59PM3.61m
3:23AM3.56m
3:44PM3.43m
4:16AM3.37m
4:38PM3.29m
5:17AM3.23m
5:49PM3.22m
6:24AM3.16m
7:15PM3.28m
7:30AM3.18m
8:20PM3.44m
8:27AM3.28m
9:06PM3.61m
Low Tide
8:41PM1.39m
9:23AM1.45m
9:39PM1.61m
10:19AM1.60m
10:59PM1.76m
11:20AM1.69m
00:16AM1.78m
12:23PM1.71m
1:19AM1.70m
1:26PM1.67m
2:11AM1.58m
2:24PM1.55m
2:53AM1.45m
part cloud
part cloud
part cloud
cloud
clear
part cloud
part cloud
cloud
rain showers
mod rain
light rain
light rain
clear
clear
mod rain
mod rain
light rain
clear
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:45
7:43
7:43
7:43
7:41
7:41
7:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:22
5:22
5:23
5:24
5:25
5:27
5:28
 mm
2
6
4
3
6
6
1
Temp °C
11
12
6
12
12
7
11
12
10
11
12
10
11
12
7
6
8
5
7
8
5
Feels °C
9
10
3
10
9
5
10
10
9
10
10
8
6
8
5
3
6
2
5
5
3
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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