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© 2026·AI-powered bite forecast
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United Kingdom / County Down / Silent Valley Reservoir

Bite forecast: Silent Valley Reservoir

  • 90 ha
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Best fishing days for the next week

  1. ThursdaySeptember 10weather-based forecast
    66/100high activity

    Drizzle: 12–18 °C

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Nearby rivers

  • Annalong River2 mi
  • Windy Gap or Pigeon Rock River3 mi
  • Kilkeel River3 mi
  • Aughnaleck River3 mi
  • Red Moss River4 mi
  • Rowan Tree River4 mi
  • Spence's River4 mi
  • Rocky Water4 mi
  • Rocky River5 mi
  • Mullagh River5 mi

Nearby water bodies

  • LakeBinian Lough1 mi
  • LakeBlue Lough2 mi
  • LakeLough Shannagh2 mi
  • ReservoirBen Crom Reservoir2 mi
  • ReservoirSpelga Reservoir3 mi
  • ReservoirFofanny Reservoir4 mi

Silent Valley Reservoir (County Down) — a popular fishing spot. About 90 ha in area. Nearby towns: Castlewellan and Rathfriland. See when the bite is best: hourly fish activity for the days ahead, computed from the weather, pressure, and season.

SaturdaySeptember 12weather-based forecast
66/100high activity

Cloudy: 10–15 °C

  • MondaySeptember 7weather-based forecast
    65/100high activity

    Cloudy: 12–16 °C

  • Nearby towns

    • Castlewellan7 mi
    • Rathfriland9 mi

    Bite calendar

    Sunday, September 6

    Aug 31 – Sep 6
    Mon
    Tue
    Wed
    Thu
    Fri
    Sat
    Sun
    Bite activity:highmediumlowslow
    Based on:weatherseasonal
    What is a bite calendar?
    DaceEuropean eelPikeRuffeWhitefishZanderPerchBreamCarpWels catfishRainbow troutBrown troutIdeChubCrucian carpRoachBleakRuddTenchWhite bream

    Bleak

    4/10 · Weak

    Hourly activity

    0:006:0012:0018:0023:00
    Bite activity:highmediumlow

    The bite is moderate — fish feed in short bursts. Pressure is rising — activity tends to be more subdued.

    Peak bite hours

    Best time — 12:00–16:00 (daytime activity).

    Tactics

    Chum one spot near a drop-off and wait for fish to arrive — don't chase them.

    Lures

    Today's bait — maggot or small hook with dough bait. In cold or murky water, add scent to your chum.

    Gear

    No special gear needed — seasonal clothing will do. Rain is expected — don't forget a rain jacket or a waterproof shell.

    Summary

    An average day — best chances during peak windows.

    How this forecast is calculated

    Why this forecast

    The computed water temperature is around 15 °C — inside the 14–26 °C comfort range for Bleak, so baseline activity is high.

    Computed water temperature by month; the green band is the 14–26 °C comfort rangecomfort 14–26 °C15 °C
    JFMAMJJASOND

    Bleak feeds by day — between sunrise and sunset; their times are in the sun-and-moon card above.

    The day: daylight hours and when Bleak feeds0:0012:0024:00

    Pressure is dropping 8 hPa over the day — fish are usually more active ahead of a weather change.

    Pressure through the day, 8 hPa change
    00:00 · 102023:00 · 1012 hPa

    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.

    Feeding windows on the day scale0:0012:0024:00

    September is an average month for Bleak here.

    JFMAMJJASOND

    These are the same values the bite curve above was computed from. How the forecast works

    6 SepSunday, September 6
    +17°

    Cloudy · feels like +14°

    Low / high
    +15°…+18°
    Precipitation
    0.0 mm
    Wind
    19 mph S
    Cloud cover
    100%
    Humidity
    82%
    Pressure
    1014 hPa
    00:00+15°—9 mphsouth wind, 9 mph73%99%
    01:00+15°—12 mphsouth wind, 12 mph79%100%
    02:00+15°—14 mphsouth wind, 14 mph89%100%
    03:00+15°—14 mphsouth wind, 14 mph94%100%
    04:00+15°—13 mphsouth wind, 13 mph94%100%
    05:00+15°—12 mphsouth wind, 12 mph95%99%
    06:00+15°—11 mphsouth wind, 11 mph93%99%
    07:00+16°—13 mphsouth wind, 13 mph91%100%
    08:00+16°—17 mphsouth wind, 17 mph87%96%
    09:00+16°—18 mphsouth wind, 18 mph87%100%
    10:00+16°—21 mphsouth wind, 21 mph85%100%
    11:00+17°—21 mphsouth wind, 21 mph82%100%
    12:00+17°—19 mphsouth wind, 19 mph82%100%
    13:00+17°—19 mphsouth wind, 19 mph83%100%
    14:00+17°—18 mphsouth wind, 18 mph84%100%
    15:00+17°—17 mphsouth wind, 17 mph85%100%
    16:00+17°—16 mphsouth wind, 16 mph86%100%
    17:00+18°—15 mphsouth wind, 15 mph85%100%
    18:00+18°—17 mphsouth wind, 17 mph86%56%
    19:00+17°—14 mphsouth wind, 14 mph88%95%
    20:00+17°0.5 mm6 mphsouth wind, 6 mph96%100%
    21:00+17°—10 mphwest wind, 10 mph90%84%
    22:00+15°—9 mphwest wind, 9 mph88%15%
    23:00+15°—8 mphwest wind, 8 mph86%72%
    +18°+16°+15°
    Weather throughout the day
    0:006:0012:0018:0023:00

    Sun and moon

    Sunday, September 6
    The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
    DaylightMoon above the horizon
    Sunrise
    06:39
    Sunset
    20:02
    Day length
    13 h 23 min
    Sunshine hours
    1 h 54 min
    UV index
    2
    low
    Moon
    Waning crescent
    Moonrise
    —
    Moonset
    18:19

    The day is 4 min shorter than yesterday.

    Sunshine hours count direct sun only — cloud cover cuts it, so it is shorter than daylight.

    Solunar feeding periods

    +11% in the windowSunday, September 6
    Feeding windows on the day scale, local time0:0012:0024:00
    Major periodsMinor periods
    • Major08:09–10:09Moon overhead
    • Minor17:49–18:49Moonset
    • Major20:39–22:39Moon underfoot

    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?