Spate · Mixed Sedimentary · Marlborough

Wairau River

Wairau River terrain map
Terrain map

The Wairau is Marlborough's main-stem brown-trout river — a long braided greywacke river running through dry vineyard country, with good fishing in its runs and especially in the clearer spring-fed tributaries and side-streams that feed it.

Species

A proper day on the water

River dropping into shape after a lift. Fishing well — get there before it drops out.

The river's easing back into shape after a lift, the water's still cold, around 8°C, and starting to clear.

75% confidence in this read
Water temperature for brown trout
Cool — slow
8°C est.ideal 1016°C
0°14°28°
The full read · show the working · for brown trout · confidence 75%
How the 71 is built — score × weight = contribution
Temperature67 × 28%18.8
Flow95 × 22%20.9
Clarity75 × 18%13.5
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity42 × 12%5.0
Conditions total= 71
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Conditions
Regional est.
Level
Moderate rain recently
No gauge reading
Water temp
8.1°C
Estimated
Clarity
Clearing
Air temp
5°C
Wind
W 13 km/h
Gentle breeze
Pressure
1013 hPa
Rain · 48h
23.3 mm
Moderate rain
Rain · ahead
1.1 mm
No meaningful rain · next 48h

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Weather-only: no live gauge wired. Braided river — main stem best falling/clearing after rain; clear tributaries fish sooner.

Hatch timeline · todayPeak at 1pm

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour with Pro.

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How to fish it · for brown trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Good — river flow is working for you, but insect activity is the limiting factor today.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
2
2
2
1
1
2
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Permits & access
Permit required — see local rules.
  • Nelson-Marlborough Fish & Game region — a Fish & Game licence is required
  • Check the current Anglers Notice
  • Check Clean Dry (didymo present)
  • Respect private-land access.
Directions
About this water

The Wairau is Marlborough's main-stem brown-trout river — a long braided greywacke river running through dry vineyard country, with good fishing in its runs and especially in the clearer spring-fed tributaries and side-streams that feed it. The braided main river fishes best falling and clearing after rain; the clear tributaries offer sight fishing through the summer. A good base for the wider Marlborough back-country.

Under the surface

The Wairau runs east down its long greywacke valley from the St Arnaud ranges through the vineyards of Marlborough to Cloudy Bay, a braided, shingle-bedded river of shifting channels and clear side-streams. Brown trout hold in its runs and in the spring-fed tributaries that feed it, in dry, sunny eastern country.

Wading: Braided shifting channels, colour after rain, slick shingle — read the level

  • River
  • Mixed sedimentary
  • Partly confined
  • Braided
  • Pool riffle
Seasons & zones
  • Trout1 October (main river) / 1 November (upper / some tributaries) → 30 April (upper) / year-round (lower)
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