Water temperature for Brown Trout
Warm — slow22°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
Water at 21.6°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 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
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 3 · 1 reaches
Day-ticket access concentrates on the lower-middle river around Rossett and Wrexham (Rossett & Gresford Flyfishers, Bradley AC). Warrington AA's water is members-only.
Alyn day-ticket water · 3 beatsMixed
Rossett & Gresford Flyfishers, Bradley Angling Club, Warrington AA — Ithell's Farm
The 3 beats
Rossett & Gresford FlyfishersDay tickets
Rossett & Gresford Flyfishers (day ticket via Fishing Passport)
2.5 miles from the railway bridge at Rossett upstream to Wormswood, Gresford — founded 1906, one of the oldest continuously-running clubs in Wales. Wild brown trout throughout; grayling established here since 2008 and now breeding. Migratory salmon and sea trout are seen scaling Rossett weir most years but rarely dwell — not a targetable run.
Day ticket £20/rod (2026 pricing). Fly-only, barbless hooks, no dogs, wash-off biosecurity policy applies.
Bradley Angling ClubDay tickets
Bradley Angling Club
From the Llay new road, Wrexham, upstream to Llay Hall Industrial Estate — mid-lower river, downstream of the Rossett & Gresford water.
Season 3 Mar–30 Sep. New adult £30, junior/senior £20 (2026 prices). Bag limit 2/day. Worm or fly only — no maggots or spinners.
Warrington AA — Ithell's FarmMembers
Warrington Anglers Association
Ithell's Farm stretch near Rossett, plus a second stretch elsewhere on the river — a large Cheshire-based club that also holds water on the Severn and Vyrnwy.
Members only, open membership policy — no day tickets sold.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 22°C — probably warm enough to stress Brown Trout . These are likely cooler.
Gallery · 2
Autumn, River Alyn, Rhydymwyn area Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 17 is built — score × weight = contribution
Temperature9 × 28%2.5
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Limiting factor: Water temperature (21.6°C) is outside Brown Trout's preferred range (10–16°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Dee (Welsh)proxy
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
Related guides
Casting instructors near here
Booking & contacts
Alyn
Water temperature for Brown Trout
Warm — slow22°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
Water at 21.6°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 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
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 3 · 1 reaches
Day-ticket access concentrates on the lower-middle river around Rossett and Wrexham (Rossett & Gresford Flyfishers, Bradley AC). Warrington AA's water is members-only.
Alyn day-ticket water · 3 beatsMixed
Rossett & Gresford Flyfishers, Bradley Angling Club, Warrington AA — Ithell's Farm
The 3 beats
Rossett & Gresford FlyfishersDay tickets
Rossett & Gresford Flyfishers (day ticket via Fishing Passport)
2.5 miles from the railway bridge at Rossett upstream to Wormswood, Gresford — founded 1906, one of the oldest continuously-running clubs in Wales. Wild brown trout throughout; grayling established here since 2008 and now breeding. Migratory salmon and sea trout are seen scaling Rossett weir most years but rarely dwell — not a targetable run.
Day ticket £20/rod (2026 pricing). Fly-only, barbless hooks, no dogs, wash-off biosecurity policy applies.
Bradley Angling ClubDay tickets
Bradley Angling Club
From the Llay new road, Wrexham, upstream to Llay Hall Industrial Estate — mid-lower river, downstream of the Rossett & Gresford water.
Season 3 Mar–30 Sep. New adult £30, junior/senior £20 (2026 prices). Bag limit 2/day. Worm or fly only — no maggots or spinners.
Warrington AA — Ithell's FarmMembers
Warrington Anglers Association
Ithell's Farm stretch near Rossett, plus a second stretch elsewhere on the river — a large Cheshire-based club that also holds water on the Severn and Vyrnwy.
Members only, open membership policy — no day tickets sold.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 22°C — probably warm enough to stress Brown Trout . These are likely cooler.
Gallery · 2
Autumn, River Alyn, Rhydymwyn area Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 17 is built — score × weight = contribution
Temperature9 × 28%2.5
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Limiting factor: Water temperature (21.6°C) is outside Brown Trout's preferred range (10–16°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Dee (Welsh)proxy
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
Related guides
Casting instructors near here
Booking & contacts