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© 2026·AI-powered bite forecast
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Ireland / County Leitrim / Diffreen River

Bite forecast: Diffreen River

  • length 9 km
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Best fishing days for the next week

  1. WednesdaySeptember 9weather-based forecast
    64/100high activity

    Cloudy: 8–13 °C

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Diffreen River (County Leitrim) — one of the area's fishing spots. About 9 km long. Nearest town — Manorhamilton. See when the bite is best: hourly fish activity for the days ahead, computed from the weather, pressure, and season.

MondaySeptember 7weather-based forecast
59/100medium activity

Drizzle: 12–14 °C

  • TuesdaySeptember 8weather-based forecast
    57/100medium activity

    Cloudy: 9–14 °C

  • Nearby towns

    • Manorhamilton6 mi

    Bite calendar

    Thursday, September 3

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

    Atlantic salmon

    6/10 · Fair

    Hourly activity

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

    The bite is strong — fish are active. Weather is steady, with no sharp swings — fish behave predictably.

    Peak bite hours

    Best time — 06:00–08:00 (dawn bite) and 20:00–22:00 (dusk bite).

    Tactics

    Work the cover — snags, weed edges, hole entrances; retrieve the lure with pauses.

    Lures

    The water's turning murky — go with bright, noisy lures: salmon spoon or salmon fly.

    Gear

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

    Summary

    Worth going — it's a productive day.

    How this forecast is calculated

    Why this forecast

    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.

    Computed water temperature by month; the green band is the 4–14 °C comfort rangecomfort 4–14 °C14 °C
    JFMAMJJASOND

    Atlantic salmon works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.

    The day: daylight hours and when Atlantic salmon feeds0:0012:0024:00

    Pressure is dropping 3 hPa over the day — fish are usually more active ahead of a weather change.

    Pressure through the day, 3 hPa change
    00:00 · 101123:00 · 1008 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 active season for Atlantic salmon here.

    JFMAMJJASOND

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

    3 SepThursday, September 3
    +17°

    Drizzle · feels like +16°

    Low / high
    +13°…+17°
    Precipitation
    0.1 mm
    Wind
    9 mph SW
    Cloud cover
    100%
    Humidity
    85%
    Pressure
    1011 hPa
    00:00+15°—10 mphwest wind, 10 mph90%94%
    01:00+15°—8 mphsouthwest wind, 8 mph91%69%
    02:00+15°—10 mphsouthwest wind, 10 mph92%45%
    03:00+15°—9 mphsouthwest wind, 9 mph92%52%
    04:00+15°—9 mphsouthwest wind, 9 mph92%79%
    05:00+14°—9 mphsouthwest wind, 9 mph92%0%
    06:00+13°—6 mphsouthwest wind, 6 mph92%56%
    07:00+13°—6 mphsouthwest wind, 6 mph94%24%
    08:00+14°—7 mphsouthwest wind, 7 mph92%18%
    09:00+14°—9 mphsouth wind, 9 mph89%98%
    10:00+16°—9 mphsouthwest wind, 9 mph88%94%
    11:00+17°—10 mphsouthwest wind, 10 mph80%100%
    12:00+17°0.1 mm9 mphsouthwest wind, 9 mph85%100%
    13:00+16°1.3 mm11 mphsouthwest wind, 11 mph92%100%
    14:00+16°0.1 mm12 mphsouthwest wind, 12 mph86%100%
    15:00+16°0.1 mm11 mphsouthwest wind, 11 mph86%100%
    16:00+16°0.1 mm12 mphsouthwest wind, 12 mph85%100%
    17:00+16°0.1 mm10 mphsouthwest wind, 10 mph81%100%
    18:00+15°0.4 mm11 mphsouthwest wind, 11 mph92%100%
    19:00+14°0.6 mm9 mphsouthwest wind, 9 mph92%100%
    20:00+14°0.8 mm9 mphsouthwest wind, 9 mph94%100%
    21:00+13°—9 mphsouthwest wind, 9 mph92%100%
    22:00+14°—9 mphsouthwest wind, 9 mph91%100%
    23:00+13°—10 mphsouthwest wind, 10 mph91%99%
    +17°+15°+13°
    Weather throughout the day
    0:006:0012:0018:0023:00

    Sun and moon

    Thursday, September 3
    The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
    DaylightMoon above the horizon
    Sunrise
    06:43
    Sunset
    20:18
    Day length
    13 h 35 min
    Sunshine hours
    1 h
    UV index
    0
    low
    Moon
    Last quarter
    Moonrise
    21:59
    Moonset
    15:17

    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

    +12% in the windowThursday, September 3
    Feeding windows on the day scale, local time0:0012:0024:00
    Major periodsMinor periods
    • Major05:12–07:12Moon overhead
    • Minor14:47–15:47Moonset
    • Major17:41–19:41Moon underfoot
    • Minor21:29–22:29Moonrise

    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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