A southeasterly has held for 6 hours at much the same temperature as the 20°C water. No thermal steer either way, but the drift still stacks food against the north-western 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.
Start with Diawl Bach (12-14) — on the bob / top dropper — slow figure-of-eight retrieve. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and change drift line before you change food group.
Watch for Sedge towards evening — this could be the best window of the day.
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
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Hatch predictions
Top prey shown — see all 5 as a supporter.
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Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Conditions are away from Llyn Cefni Reservoir's sweet spot — it usually fishes best in ripple wind with cloud skies.
NRW WFD Cycle 3 (lake) — Cefni Reservoir: Moderate ecological status. Re-tagged 2026-06-18 from the Braint river reach to the reservoir's own lake waterbody. Source: NRW DataMapWales WFD Cycle 3 classification layer.
NRW (Wales) · GB31032926
A southeasterly has held for 6 hours at much the same temperature as the 20°C water. No thermal steer either way, but the drift still stacks food against the north-western 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.
Start with Diawl Bach (12-14) — on the bob / top dropper — slow figure-of-eight retrieve. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and change drift line before you change food group.
Watch for Sedge towards evening — this could be the best window of the day.
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Hatch predictions
Top prey shown — see all 5 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Conditions are away from Llyn Cefni Reservoir's sweet spot — it usually fishes best in ripple wind with cloud skies.
NRW WFD Cycle 3 (lake) — Cefni Reservoir: Moderate ecological status. Re-tagged 2026-06-18 from the Braint river reach to the reservoir's own lake waterbody. Source: NRW DataMapWales WFD Cycle 3 classification layer.
NRW (Wales) · GB31032926
