Stillwater · Silurian Mudstone Shale · Wales / Cambrian Mountains (upper Twymyn catchment, above Llanbrynmair)

Llyn Gwyddior

A calm upland lake seen across open moorland, with a band of conifer forestry on the far hillside under a partly cloudy sky.
Fair · Trout
Marabou Damsel · 8-12
Fairlive now
Good drifting conditions on Llyn Gwyddior
Good wave on — drift country. A useful wave. Work the productive shore.
60% confidence

Llyn Gwyddior is often best in spring through autumn.

What moved it
  • WindN 7 km/hLight breeze · Gusts to 18 km/h
Today's fly
Marabou Damsel
Marabou Damsel8-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze · Gusts to 18 km/h
N 7 km/h
N
N
from the north
WaveRipple
Water temp—
Air temp11°C
CloudClear
Pressure1020 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
Late April–June; evening rises through summer
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

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

Bank

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

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

Start free trial

14-day free trial. Cancel anytime.

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
Murrough (Great Red Sedge)Hatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Lake OliveHatch
1
2
2
2
2
2
1

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

Ranked for today
Trout fly box
Bays & launches · 1
Access via Llanbrynmair Angling AssociationAccess varies
Small unstocked hill lake above Llanbrynmair, wild brown trout, fly only.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Condition match
66%
Cloud25%
Wind100%
Temp60%

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

Other water nearby · 5
Llyn Coch Hwyad
4.0 km
Brown trout
Lake Vyrnwy
15 km
Brown trout · Rainbow trout
Llyn Bugeilyn
19 km
Brown trout
Llyn Clywedog
20 km
Rainbow trout · Brown trout
Llyn Penrhaeadr
23 km
Brown trout · Perch
Gallery · 2
  1. A calm upland lake seen across open moorland, with a band of conifer forestry on the far hillside under a partly cloudy sky.
    Llyn Gwyddior from the west
  2. Terrain map of the venue
    Terrain map
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
Related guides
Scotland Playbookloch & river fishingThermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts