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5 verified Rainbow trout catches are linked to Grafham Water. The forecast below uses this waterbody and current weather data.
Hourly activity and a seven-day calendar for Rainbow trout.
Tuesday, September 8
The bite is strong — fish are active. Pressure is dropping — this usually boosts the bite.
Best time — 06:00–08:00 (dawn bite) and 19:00–21:00 (dusk bite).
Look for drop-offs and gaps in the weeds, retrieve slowly, lingering over promising spots.
The water's turning murky — go with bright, noisy lures: trout paste or trout spoon.
No special gear needed — seasonal clothing will do. Rain is expected — don't forget a rain jacket or a waterproof shell.
Worth going — it's a productive day.
The computed water temperature is around 16 °C — warmer than the 6–16 °C comfort range for Rainbow trout: in the heat it drops deeper and feeds less often.
Rainbow trout works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.
Pressure is dropping 4 hPa over the day — fish are usually more active ahead of a weather change.
September is an active season for Rainbow trout here.
These are the same values the bite curve above was computed from. How the forecast works
Drizzle · feels like +14°
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?Recorded 5 catches here. Most commonly caught: Rainbow trout. Peak season: year-round.
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 |
|---|---|---|
| Jan | 1 | 20% |
| Apr | 2 | 40% |
| Jun | 1 | 20% |
| Oct | 1 | 20% |
Reservoir Grafham Water (Cambridgeshire) — a spot well known among anglers. About 6.1 km² in area. Species found here: rainbow trout. A smart bite calendar — moon phase, atmospheric pressure, and weather combined into an hourly fish-activity forecast for the coming days.