- Ecology: Unknown
- Chemical: Unknown
Rules at a glance
- Free fishing
- Fly only
Water temperature for Brown Trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
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 — water clarity is right today, though time of day could be better.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Sea trout runRun
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
- IFI conservation bye-law (2026): salmon closed; sea trout >40 cm closed; one sea trout of 40 cm or less per day in season
- Devil's Glen (Coillte) public car park is the practical access
- Vartry Reservoir closed to angling — Uisce Éireann drinking-water supply
- State rod licence required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Vartry, Wicklow, Ireland Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 90%
How the 73 is built — score × weight = contribution
Temperature64 × 28%17.9
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure70 × 7%4.9
Insect activity67 × 12%8.0
Conditions total= 73
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Sea trout 1 May → 30 SeptemberClosed
Related guides
Casting instructors near here
Booking & contacts
River Vartry
Water temperature for Brown Trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
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 — water clarity is right today, though time of day could be better.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Sea trout runRun
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
- IFI conservation bye-law (2026): salmon closed; sea trout >40 cm closed; one sea trout of 40 cm or less per day in season
- Devil's Glen (Coillte) public car park is the practical access
- Vartry Reservoir closed to angling — Uisce Éireann drinking-water supply
- State rod licence required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Vartry, Wicklow, Ireland Terrain map
Water quality (WFD)
- Ecology: Unknown
- Chemical: Unknown
The full read · show the working · for Brown Trout · confidence 90%
How the 73 is built — score × weight = contribution
Temperature64 × 28%17.9
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure70 × 7%4.9
Insect activity67 × 12%8.0
Conditions total= 73
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Sea trout 1 May → 30 SeptemberClosed
Related guides
Casting instructors near here
Booking & contacts