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Where to fish

  • Forecast
  • Catches

Mine

  • Favorites
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© 2026·AI-powered bite forecast
0.1.0+2164 · 9bcc296f

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United Kingdom / Powys / Reservoir Llyn Clywedog

Bite forecast: Reservoir Llyn Clywedog

  • 2.4 km²
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Best fishing days for the next week

  1. MondaySeptember 7weather-based forecast
    70/100high activity

    Cloudy: 13–14 °C

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Reservoir Llyn Clywedog (Powys) — a popular fishing spot. About 2.4 km² in area. Nearest town — Newtown. This page shows an hourly bite forecast for today and the week ahead; the algorithm factors in the weather, atmospheric pressure, and the moon phase.

Catches

Recorded 1 catch here. Most commonly caught: Rainbow trout. Peak season: June.

  • Rainbow trout
    Llyn Clywedog
    16 °C11 mph
    Jun 01, 2016, 9:42 AM
SundaySeptember 6weather-based forecast
68/100high activity

Clear: 13–21 °C

  • TuesdaySeptember 8weather-based forecast
    67/100high activity

    Drizzle: 9–13 °C

  • Nearby towns

    • Newtown12 mi

    Bite calendar

    Friday, September 4

    Aug 31 – Sep 6
    Mon
    Tue
    Wed
    Thu
    Fri
    Sat
    Sun
    Bite activity:highmediumlowslow
    Based on:weatherseasonal
    What is a bite calendar?

    In the fish list, this icon marks species recorded here by GBIF. Unmarked species may still occur in the waterbody.

    BreamCarpWels catfishDaceEuropean eelPikeRuffeWhitefishZanderBrown troutIdePerchRainbow troutChubCrucian carpRoachRuddWhite breamBleakTench

    Bleak

    3/10 · Weak

    Hourly activity

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

    The bite is moderate — fish feed in short bursts. A thunderstorm is possible: activity rises before the front and drops after.

    Peak bite hours

    Best time — 11:00–17:00 (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. A thunderstorm is possible — bring a rain jacket, and pack up at the first rumble of thunder.

    Summary

    An average day — best chances during peak windows.

    How this forecast is calculated

    Why this forecast

    The computed water temperature is around 14 °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 °C14 °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 rising 8 hPa over the day — the bite usually settles down after a rise.

    Pressure through the day, 8 hPa change
    00:00 · 101123:00 · 1019 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

    4 SepFriday, September 4
    +15°

    Cloudy · feels like +10°

    Low / high
    +12°…+17°
    Precipitation
    0.0 mm
    Wind
    18 mph W
    Cloud cover
    100%
    Humidity
    70%
    Pressure
    1013 hPa
    00:00+16°—14 mphsouthwest wind, 14 mph96%100%
    01:00+16°0.4 mm15 mphsouthwest wind, 15 mph96%100%
    02:00+17°0.4 mm16 mphsouthwest wind, 16 mph95%100%
    03:00+17°0.8 mm15 mphsouthwest wind, 15 mph95%100%
    04:00+17°1.0 mm14 mphsouthwest wind, 14 mph95%100%
    05:00+15°2.4 mm9 mphnorthwest wind, 9 mph94%100%
    06:00+14°3.6 mm10 mphwest wind, 10 mph93%100%
    07:00+14°2.2 mm9 mphwest wind, 9 mph93%100%
    08:00+14°0.5 mm12 mphwest wind, 12 mph92%100%
    09:00+14°—14 mphwest wind, 14 mph88%100%
    10:00+14°—15 mphwest wind, 15 mph78%100%
    11:00+15°—19 mphwest wind, 19 mph72%100%
    12:00+15°—18 mphwest wind, 18 mph70%100%
    13:00+15°—18 mphwest wind, 18 mph64%100%
    14:00+15°—16 mphwest wind, 16 mph66%100%
    15:00+15°—16 mphwest wind, 16 mph67%100%
    16:00+15°—15 mphwest wind, 15 mph68%100%
    17:00+15°—14 mphwest wind, 14 mph69%70%
    18:00+15°—14 mphwest wind, 14 mph74%47%
    19:00+14°—14 mphwest wind, 14 mph75%20%
    20:00+14°—12 mphwest wind, 12 mph79%28%
    21:00+13°—11 mphwest wind, 11 mph83%20%
    22:00+13°—10 mphwest wind, 10 mph82%91%
    23:00+12°—11 mphwest wind, 11 mph84%23%
    +17°+15°+12°
    Weather throughout the day
    0:006:0012:0018:0023:00

    Sun and moon

    Friday, September 4
    The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
    DaylightMoon above the horizon
    Sunrise
    06:29
    Sunset
    19:54
    Day length
    13 h 25 min
    Sunshine hours
    6 h 47 min
    UV index
    3
    moderate
    Moon
    Last quarter
    Moonrise
    22:44
    Moonset
    16:05

    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

    +13% in the windowFriday, September 4
    Feeding windows on the day scale, local time0:0012:0024:00
    Major periodsMinor periods
    • Major05:55–07:55Moon overhead
    • Minor15:35–16:35Moonset
    • Major18:26–20:26Moon underfoot
    • Minor22:14–23:14Moonrise

    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?

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