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© 2026·AI-powered bite forecast
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United Kingdom / Powys / River Eirth

Bite forecast: River Eirth

  • length 3 km
Loading map…

Best fishing days for the next week

  1. MondaySeptember 7weather-based forecast
    65/100high activity

    Cloudy: 13–14 °C

  2. SundaySeptember 6weather-based forecast
    63/100high activity

    Clear: 13–21 °C

  3. TuesdaySeptember 8weather-based forecast
    63/100high activity

    Drizzle: 9–13 °C

River Eirth (Powys) — one of the area's fishing spots. About 3 km long. Here you'll find a bite prediction — when fish are active and which hours give the best chances, adjusted for weather and pressure.

Loading map…

Bite calendar

7–Sep 13
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.

European eelPikeWhitefishBarbelWels catfishDaceGraylingRuffeZanderAtlantic salmonBreamBrown troutPerchRainbow troutCarpChubIdeCrucian carpRoachBleakRuddTenchWhite bream

Atlantic salmon

7/10 · Good

Hourly activity

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

The bite is strong — fish are active. Pressure is dropping — this usually boosts the bite.

Peak bite hours

Best time — 06:00–08:00 (dawn bite) and 19:00–21:00 (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

Pack transitional-season clothing — mornings and evenings are chilly. 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 13 °C — inside the 4–14 °C comfort range for Atlantic salmon, so baseline activity is high.

Computed water temperature by month; the green band is the 4–14 °C comfort rangecomfort 4–14 °C13 °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 2 hPa over the day — fish are usually more active ahead of a weather change.

Pressure through the day, 2 hPa change
00:00 · 101223:00 · 1010 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

8 SepTuesday, September 8
+13°

Drizzle · feels like +8°

Low / high
+9°…+13°
Precipitation
0.2 mm
Wind
18 mph W
Cloud cover
35%
Humidity
71%
Pressure
1012 hPa
00:00+12°0.4 mm16 mphwest wind, 16 mph86%29%
01:00+12°0.4 mm14 mphwest wind, 14 mph87%0%
02:00+11°—12 mphwest wind, 12 mph86%0%
03:00+10°—11 mphwest wind, 11 mph85%0%
04:00+9°—10 mphwest wind, 10 mph84%6%
05:00+9°—9 mphwest wind, 9 mph85%9%
06:00+9°—9 mphsouthwest wind, 9 mph86%12%
07:00+9°—10 mphsouthwest wind, 10 mph86%16%
08:00+10°—12 mphsouthwest wind, 12 mph81%20%
09:00+11°—15 mphwest wind, 15 mph75%24%
10:00+12°—17 mphwest wind, 17 mph70%28%
11:00+13°0.2 mm18 mphwest wind, 18 mph69%32%
12:00+13°0.2 mm18 mphwest wind, 18 mph71%35%
13:00+13°0.2 mm18 mphwest wind, 18 mph72%42%
14:00+13°0.1 mm18 mphwest wind, 18 mph72%55%
15:00+13°0.1 mm18 mphwest wind, 18 mph73%71%
16:00+13°0.1 mm18 mphwest wind, 18 mph74%81%
17:00+12°0.2 mm16 mphwest wind, 16 mph78%81%
18:00+12°0.2 mm15 mphwest wind, 15 mph82%75%
19:00+11°0.2 mm13 mphwest wind, 13 mph86%66%
20:00+11°0.1 mm13 mphwest wind, 13 mph88%53%
21:00+11°0.1 mm13 mphwest wind, 13 mph88%37%
22:00+10°0.1 mm14 mphwest wind, 14 mph89%28%
23:00+10°—13 mphwest wind, 13 mph90%33%
+13°+11°+9°
Weather throughout the day
0:006:0012:0018:0023:00

Sun and moon

Tuesday, September 8
The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
DaylightMoon above the horizon
Sunrise
06:36
Sunset
19:45
Day length
13 h 9 min
Sunshine hours
12 h 18 min
UV index
4
moderate
Moon
Waning crescent
Moonrise
02:33
Moonset
18:50

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 windowTuesday, September 8
Feeding windows on the day scale, local time0:0012:0024:00
Major periodsMinor periods
  • Minor02:03–03:03Moonrise
  • Major09:54–11:54Moon overhead
  • Minor18:20–19:20Moonset
  • Major22:21–00:00Moon 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?

Nearby rivers

  • Afon Eirth2 mi
  • Afon Cedig3 mi
  • Afon Tanat4 mi
  • Afon Rhaeadr4 mi
  • Afon Ceidiog5 mi
  • Afon Nadroedd5 mi
  • Afon Rhaiadr5 mi
  • Afon Eiddew5 mi
  • Afon Caletwr5 mi
  • Afon Iwrch5 mi

Nearby water bodies

  • ReservoirLlyn y Mynydd3 mi
  • LakeLlyn Lluncaws3 mi
  • ReservoirLake Vyrnwy5 mi