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River Irfon (Powys) — one of the area's fishing spots. About 47 km long. Close by — Llanwrtyd Wells, Builth Wells and Llandrindod Wells. A smart bite calendar — moon phase, atmospheric pressure, and weather combined into an hourly fish-activity forecast for the coming days.
Recorded 7 catches here. Most commonly caught: Grayling, Brown trout, Atlantic salmon. Peak season: year-round.
In the fish list, this icon marks species recorded here by GBIF. Unmarked species may still occur in the waterbody.
Occurs in this waterbody — confirmed by observations. Source: GBIF
The bite is strong — fish are active. Weather is steady, with no sharp swings — fish behave predictably.
Best time — 06:00–08:00 (dawn bite) and 19:00–21:00 (dusk bite).
Work the cover — snags, weed edges, hole entrances; retrieve the lure with pauses.
The water's turning murky — go with bright, noisy lures: salmon spoon or salmon fly.
Pack transitional-season clothing — mornings and evenings are chilly. Winds will be strong — wind protection helps, and be careful if you're in a boat.
Worth going — it's a productive day.
The computed water temperature is around 14 °C — warmer than the 4–14 °C comfort range for Atlantic salmon: in the heat it drops deeper and feeds less often.
Atlantic salmon works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.
Pressure is dropping 9 hPa over the day — fish are usually more active ahead of a weather change.
One more input — the moon's feeding windows: within their hours the score sits higher than across the rest of the day. The window times are in the “Solunar feeding periods” card below.
September is an active season for Atlantic salmon here.
These are the same values the bite curve above was computed from. How the forecast works
Cloudy · feels like +16°
The day is 4 min shorter than yesterday.
Sunshine hours count direct sun only — cloud cover cuts it, so it is shorter than daylight.
The windows are set by the moon's transit and rise, and the forecast above already accounts for them: within these hours the bite score sits higher than across the rest of the day, while the day's overall level still comes from the catch-calibrated model.
What are solunar periods?BiteGuideFrom anglers’ reports
This is a summary of anglers' reports, not a proven cause of the bite: conditions lining up does not mean they drove it.
vertical axis — number of catches
| Value | Catches | Share |
|---|---|---|
| Grayling | 5 | 71% |
| Atlantic salmon | 1 | 14% |
| Brown trout | 1 | 14% |