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Where to fish

  • Forecast
  • Catches

Mine

  • Favorites
Forecast
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© 2026·AI-powered bite forecast
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United Kingdom / Gwynedd

Gwynedd — bite forecast

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Towns and settlements (3)
BalaBarmouthCriccieth
Rivers (87)
Adam RiverAfon AddaAfon AlwenAfon ArdduAfon ArranAfon ArtroAfon BarlwydAfon BowyddAfon CaderAfon CaletwrAfon CasegAfon CeginAfon CelynogAfon CleifionAfon ColwynAfon CrawcwelltAfon Cwm DuAfon Cwm-mynachAfon CwmnantcolAfon CynfalAfon CywarchAfon DesachAfon DugoedAfon DwrnudonAfon DwyfachAfon DwynantAfon DwyrydAfon DyfrdwyAfon DylifAfon DysynniAfon EirthAfon ErchAfon GainAfon GamlanAfon GauAfon GelynAfon GlaslynAfon GlynAfon GoedolAfon GwyrfaiAfon HarnogAfon HwchAfon IdwalAfon LasAfon LlafarAfon LlifonAfon LliwAfon MawddachAfon MelochAfon MynachAfon Nant PerisAfon OgwenAfon Rhaeadr-bachAfon Rhaeadr-fawrAfon Rhyd-hirAfon RhythalltAfon SeiontAfon Tafarn-helygAfon TeiglAfon TrywerynAfon WenAfon WninAfon WnionAfon y BalaAfon YsgethinAfon YstradauCeunant SychDinorwic Diversion TunnelDry GorgeGaledffrwdHirnantLeatLlanberis FallsNanmorNant HelygogNant Peris RiverNant Rhyd-wenNant-y-GwrydRhaedr DduRiver BarlwydRiver CrawcwelltRiver DeeRiver DoveyRiver DwyforRiver EdenSeiontThe Secret Waterfall
Water bodies (119)
Llyn CelynLlyn TegidLlyn Trawsfynydd

116 more — find yours by name.

Best fishing days for the next week

  1. WednesdaySeptember 2weather-based forecast
    60/100high activity

    Drizzle: 16–19 °C

Which fish are caught here

  • Brown trout5 catches

Catches

Recorded 5 catches here. Most commonly caught: Brown trout. Peak season: August–September.

  • Brown trout
    Llyn Cwellyn
    17 °C16 mph
    Sep 17, 2021, 1:24 PM

Gwynedd — a fishing region with dozens of rivers and lakes. The region has 3 cities, 87 rivers and 119 water bodies. Species found here: bleak, roach, rainbow trout, wels catfish, ide and ruffe. Here you'll find a bite prediction — when fish are active and which hours give the best chances, adjusted for weather and pressure.

TuesdaySeptember 8weather-based forecast
57/100medium activity

Cloudy: 12–18 °C

  • ThursdaySeptember 3weather-based forecast
    56/100medium activity

    Cloudy: 15–19 °C

  • Brown trout
    Llyn Bach Gamallt
    17 °C7 mph
    Sep 05, 2021, 4:32 PM
  • Brown trout
    Llyn Mawr Gamallt
    17 °C7 mph
    Sep 05, 2021, 2:53 PM
  • Brown trout
    Llyn Mawr Gamallt
    17 °C7 mph
    Sep 05, 2021, 2:45 PM
  • Brown trout
    River Dwyfor
    19 °C18 mph
    Aug 21, 2015, 11:13 AM
  • Bite calendar

    Wednesday, September 2

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

    Bite on rivers

    2 SepWednesday, September 2

    Tap any fish to open its full forecast — the hours it bites, what it takes, and where it has been caught.

    0:0023:00
    • Dace9/10
    • European eel9/10
    • Grayling9/10
    • Pike9/10
    • Barbel8/10
    • Ruffe8/10
    • Whitefish8/10
    • Zander8/10
    • Perch7/10
    • Atlantic salmon6/10
    • Bream6/10
    • Brown trout6/10
    • Carp6/10
    • Rainbow trout6/10
    • Wels catfish6/10
    • Ide5/10
    • Roach5/10
    • Bleak4/10
    • Chub4/10
    • Crucian carp4/10
    • White bream4/10
    • Rudd3/10
    • Tench3/10
    Bite activity:highmediumlow
    How this forecast is calculated
    2 SepWednesday, September 2
    +18°

    Drizzle · feels like +16°

    Low / high
    +15°…+19°
    Precipitation
    0.4 mm
    Wind
    19 mph SW
    Cloud cover
    100%
    Humidity
    96%
    Pressure
    1014 hPa
    00:00+17°—14 mphsouthwest wind, 14 mph85%100%
    01:00+17°—13 mphsouthwest wind, 13 mph86%100%
    02:00+17°—12 mphsouthwest wind, 12 mph85%100%
    03:00+16°0.2 mm11 mphsouthwest wind, 11 mph91%100%
    04:00+15°1.7 mm5 mphwest wind, 5 mph98%100%
    05:00+16°6.1 mm13 mphsouth wind, 13 mph97%100%
    06:00+17°1.8 mm14 mphsouth wind, 14 mph97%100%
    07:00+16°3.3 mm12 mphsouth wind, 12 mph97%100%
    08:00+16°4.8 mm19 mphsouth wind, 19 mph97%100%
    09:00+17°2.3 mm22 mphsouth wind, 22 mph96%100%
    10:00+18°0.4 mm20 mphsouthwest wind, 20 mph96%100%
    11:00+18°0.1 mm18 mphsouthwest wind, 18 mph95%100%
    12:00+18°0.4 mm19 mphsouthwest wind, 19 mph96%100%
    13:00+18°0.2 mm19 mphsouthwest wind, 19 mph95%100%
    14:00+18°—18 mphsouthwest wind, 18 mph94%99%
    15:00+19°—17 mphsouthwest wind, 17 mph93%100%
    16:00+19°—16 mphsouthwest wind, 16 mph93%100%
    17:00+19°—18 mphsouthwest wind, 18 mph89%87%
    18:00+18°—17 mphsouthwest wind, 17 mph91%91%
    19:00+18°—17 mphsouthwest wind, 17 mph92%100%
    20:00+18°—17 mphsouthwest wind, 17 mph92%66%
    21:00+18°—15 mphsouthwest wind, 15 mph94%93%
    22:00+18°—15 mphsouthwest wind, 15 mph93%100%
    23:00+18°—18 mphsouthwest wind, 18 mph94%100%
    +19°+17°+15°
    Weather throughout the day
    0:006:0012:0018:0023:00

    Sun and moon

    Wednesday, September 2
    The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
    DaylightMoon above the horizon
    Sunrise
    06:28
    Sunset
    20:03
    Day length
    13 h 35 min
    Sunshine hours
    1 h 18 min
    UV index
    1
    low
    Moon
    Waning gibbous
    Moonrise
    21:21
    Moonset
    13:24

    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 windowWednesday, September 2
    Feeding windows on the day scale, local time0:0012:0024:00
    Major periodsMinor periods
    • Major04:01–06:01Moon overhead
    • Minor12:54–13:54Moonset
    • Major16:28–18:28Moon underfoot
    • Minor20:51–21:51Moonrise

    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?

    Recommendations

    Tactics

    Look for drop-offs and gaps in the weeds, retrieve slowly, lingering over promising spots.

    Lures

    The water's turning murky — go with bright, noisy lures: worm bottom rig or fish strip bait.

    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.