Upland Natural Lake · Slate · Gwynedd / Snowdonia, GB-WLS

Llynnau Mymbyr

Panoramic view across the twin lakes of Llynnau Mymbyr toward Moel Siabod and Snowdon in Eryri National Park, Wales
Fair · Trout
Cat's Whisker · 8-12
Fairlive now
Good drifting conditions on Llynnau Mymbyr
Good wave on — drift country. A useful wave. Work the productive shore.
57% confidence
What moved it
  • WindSW 17 km/hGentle breeze
Today's fly
Cat's Whisker
Cat's Whisker8-12
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze
SW 17 km/h
N
SW
from the south-west
Wave20 cm ripple
Water temp8.0°C
Air temp9°C
CloudBroken
Pressure1018 hPa
Rain · recent0.0 mm

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

Head to
Wind driftSW wind
North-eastern end

A southwesterly has held for most of a day, running warmer than the water (12°C air against 8°C water). Expect fish at the north-eastern end — the bank it is blowing into — where the drift piles food, colour and warmth together. 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
May to September
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

Buzzer may strengthen through the middle of the day as conditions warm.

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 4 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
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
Fly box · Trout
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. Panoramic view across the twin lakes of Llynnau Mymbyr toward Moel Siabod and Snowdon in Eryri National Park, Wales
    Llynnau Mymbyr looking toward Moel Siabod and Snowdon, Eryri
  2. Terrain map of the venue
    Terrain map
Why this score
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout 3 March → 30 September
Related guides
Casting instructors near here
Booking & contacts