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Surf Forecasts:

Onekaka surf break

Onekaka surfForecast / Nelson – Tasman Bay / New Zealand

information circle16 Day Weather and Surf, issued 12 pm Tuesday 17 Mar 2026 NZDT
Forecast update in hr  min  s Forecast update imminent
Onekaka surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Onekaka sea temperature is
18.6° C
 (Which is 1.0°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Onekaka this week:

The surf forecast for Onekaka over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Mar 20) at 10PM. The primary swell is predicted to be 1.1m and 5s period with a secondary swell of 0.8m and 5s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onekaka in the next 16 days are 1.1m 5s and forecast to arrive on Friday (Mar 20) at 10PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Wednesday (Mar 18) at 10AM.

Wave TypeTime (NZDT) & Date Wave Height & Period
Next good surf (1 star+)10PM (Fri 20th Mar)3.5ft (1.1m) 5s
Best Surf10PM (Fri 20th Mar)3.5ft (1.1m) 5s
Most Powerful10PM (Fri 20th Mar)3.5ft (1.1m) 5s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Mostly dry. Warm (max 22°C on Wed morning, min 13°C on Tue night). Wind will be generally light.

Days 3-6 Weather Summary Some drizzle, heaviest during Fri afternoon. Very mild (max 19°C on Fri morning, min 13°C on Sat night). Wind will be generally light.

Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
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
See all maps
Wave Height (m) & direction (?)
0.1
NW
0.1
N
0.1
N
0.1
N
0.7
NW
0.2
N
0.6
E
0.5
E
0.6
ESE
0.4
SE
0.3
E
0.9
ESE
0.3
ENE
0.2
ENE
0.2
N
0.2
N
0.2
N
0.2
N
0.1
NW
0.2
ENE
0.2
E
Period(s) (?)1619181841754445543141313141833
Wave
Graph
(?)Metric surfscale
Energy kJ (?)00001401510123446310000011
Wind
(km/h)
0
NNE
10
NNE
5
SW
5
WNW
15
WNW
5
ESE
5
ESE
5
NE
5
SSW
5
ENE
0
NNE
5
WNW
0
N
10
NNE
5
S
0
ENE
5
NE
5
S
5
E
5
ENE
5
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glassonoffcross-
off		cross-
off		crosscross-
on		onoffglassglasscross-
off		glassonglassglassoncross-
off		glassonoff
High Tide
/ height (m)
9:42PM
3.95
9:59AM
4.35
10:23PM
4.21
10:33AM
4.59
11:03PM
4.43
11:09AM
4.72
11:40PM
4.57
11:46AM
4.72
12:18AM
4.61
12:27PM
4.59
12:56AM
4.51
1:10PM
4.36
1:36AM
4.28
Low Tide
/ height (m)
3:23PM
0.65
3:45AM
0.35
3:59PM
0.31
4:21AM
0.08
4:34PM
0.04
4:56AM
-0.09
5:09PM
-0.11
5:31AM
-0.16
5:45PM
-0.11
6:08AM
-0.11
6:25PM
0.02
6:47AM
0.07
7:08PM
0.27
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Sunrise7:26--7:28--7:28--7:30--7:31--7:31--7:33--
Sunset-7:46--7:45--7:44--7:42--7:39--7:38--7:37-
clear
clear
clear
part cloud
cloud
part cloud
clear
part cloud
clear
clear
light rain
part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
Rain (mm)
----------1----------
Temp. °C181816222118211917191816171715181716171816
Feels °C (?)171716191918191816181916161715171615151614
  • 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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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Onekaka surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Onekaka at:
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Information about the Onekaka Surf forecast

The above surf forecast table for Onekaka provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Onekaka can be found by selecting the local surf guide option on the grey menu. Our Onekaka 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 (Onekaka) 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 Onekaka 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 Onekaka, camping, hotels and holiday cottages in Nelson - Tasman Bay, consider staying in Nelson which is 76 km (47 miles) away.

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