Stillwater · Ordovician Volcanics · Wales / Snowdonia (Nantlle valley, Llyfni catchment)

Llyn Nantlle

Calm mirror-still Llyn Nantlle reflecting snow-capped Snowdonia mountains and a cloudy pink-tinged sunrise sky.
Fair · Trout
Minkie · 6-10
A respectable few hours, if you choose your moments
Good wave on — drift country. A useful wave. Work the productive shore.
45% confidence
limited data

Llyn Nantlle is often best in spring through autumn.

What moved it
  • WindN 12 km/hGentle breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze
N 12 km/h
N
N
from the north
Wave20 cm ripple
Water temp
Air temp12°C
CloudBroken
Pressure1023 hPa
Rain · recent0.0 mm

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

How to fish it · for Trout
When
Browns April–September; sea trout June–August after spates, best after dark
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

Plan B

If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.

Watch for

Sedge should come on through the afternoon as the water warms.

Bank

Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 5 with Pro.

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Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
2
Claret DunHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2

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

Ranked for today
Trout fly box
Bays & launches · 1
Day ticket via Seiont, Gwyrfai and Llyfni Fishing SocietyAccess varies
Valley lake below the Nantlle Ridge with wild browns and a genuine sea trout run — arguably the pick of the society's smaller waters.
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What's coming
Plan ahead
5-day outlook
Condition match
65%
Cloud70%
Wind65%
Temp60%

A reasonable day here, though temperature isn't quite in the sweet spot.

Other water nearby · 5
Gallery · 2
  1. Calm mirror-still Llyn Nantlle reflecting snow-capped Snowdonia mountains and a cloudy pink-tinged sunrise sky.
    Nantlle lake Sunrise
  2. Terrain map of the venue
    Terrain map
Why this score
  • Daddy Longlegs are in their seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones

Sea trout: Variable seasonal (2026)

Related guides
Casting instructors near here
Booking & contacts