Stillwater · Silurian Mudstone Shale · Wales / Cambrian Mountains (Plynlimon foothills), GB-WLS

Llyn Syfydrin

Llyn Syfydrin, a still moorland lake on the Pumlumon upland plateau in mid Wales.

Syfydrin is about a mile north of Pen Dam — ten hectares of upland water with a strong head of small, vividly marked wild brown trout.

Fair · Trout
Minkie · 6-10
Fairlive now
Buzzer expected on Llyn Syfydrin
Good wave on — drift country. A useful wave. Work the productive shore.
59% confidence

Llyn Syfydrin is often best in spring through autumn.

What moved it
  • WindSW 20 km/hGentle breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze
SW 20 km/h
N
SW
from the south-west
Wave40 cm chop
Water temp12.6°C
Air temp14°C
CloudOvercast
Pressure1019 hPa
Rain · recent0.0 mm

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

Head to
Wind driftS wind
Northern end

A southerly has held for 15 hours at much the same temperature as the 13°C water. No thermal steer either way, but the drift still stacks food against the northern end — the bank it is blowing into — so start there. This reads the upper water, though — a bottom bait at range feels it far less than a floater or a fish in the margins. Treat it as a tiebreaker between good swims rather than an override — features and angling pressure usually count for more.

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

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

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(1)

Hatch predictions

Top prey shown — see all 5 with Pro.

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Through the year
0–3 scale · September 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 Fishing PassportAccess varies
Upland Plynlimon-foothill lake a mile north of Pen Dam — strong head of small wild brown trout.
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What's coming
Plan ahead
5-day outlook
Condition match
71%
Cloud50%
Wind65%
Temp100%

A good match for Llyn Syfydrin — most conditions are close to what it fishes best in.

Other water nearby · 5
Gallery · 2
  1. Llyn Syfydrin, a still moorland lake on the Pumlumon upland plateau in mid Wales.
    Llyn Syfydrin, a remote upland lake on the Pumlumon plateau, mid Wales.
  2. Terrain map of the venue
    Terrain map
About this water

Syfydrin is about a mile north of Pen Dam — ten hectares of upland water with a strong head of small, vividly marked wild brown trout. The banks are boggy away from the road end, so wear sensible boots and pick your wading. Fly, spin and worm permitted on the Aberystwyth AA ticket.

  • Lake
  • Silurian mudstone shale
Why this score
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
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