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Where to fish

  • Forecast
  • Catches

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© 2026·AI-powered bite forecast
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United Kingdom / Powys / Reservoir Llyn Clywedog

Bite forecast: Reservoir Llyn Clywedog

  • 2.4 km²
Loading map…

Best fishing days for the next week

  1. SundaySeptember 6weather-based forecast
    68/100high activity

    Cloudy: 12–19 °C

  2. ThursdaySeptember 3weather-based forecast
    65/100high activity

    Cloudy: 15–19 °C

  3. WednesdaySeptember 2weather-based forecast
    58/100medium activity

    Drizzle: 13–18 °C

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.

Nearby towns

  • Newtown12 mi
Loading map…

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

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.

WhitefishDaceEuropean eelPikeRuffeZanderBreamBrown troutWels catfishPerchRainbow troutCarpChubIdeCrucian carpRoachWhite breamBleakRuddTench

Bleak

3/10 · Weak

Hourly activity

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

The bite is moderate — fish feed in short bursts. Pressure is dropping — this usually boosts the bite.

Peak bite hours

Best time — 10:00–16:00 (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

Pack transitional-season clothing — mornings and evenings are chilly. 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 12 °C — colder than the 14–26 °C comfort range for Bleak: the fish conserves energy and takes more cautiously.

Computed water temperature by month; the green band is the 14–26 °C comfort rangecomfort 14–26 °C12 °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 3 hPa over the day — the bite usually settles down after a rise.

Pressure through the day, 3 hPa change
00:00 · 101023:00 · 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

8 SepTuesday, September 8
+12°

Drizzle · feels like +11°

Low / high
+6°…+13°
Precipitation
0.2 mm
Wind
4 mph NW
Cloud cover
92%
Humidity
71%
Pressure
1008 hPa
00:00+11°0.2 mm7 mphsouthwest wind, 7 mph93%100%
01:00+10°0.2 mm7 mphwest wind, 7 mph93%100%
02:00+10°0.1 mm7 mphwest wind, 7 mph93%100%
03:00+10°0.1 mm7 mphsouthwest wind, 7 mph93%100%
04:00+10°0.1 mm6 mphsouthwest wind, 6 mph93%100%
05:00+8°—5 mphsouthwest wind, 5 mph95%67%
06:00+7°—4 mphsouthwest wind, 4 mph98%22%
07:00+6°—4 mphsouthwest wind, 4 mph98%0%
08:00+7°—3 mphsouthwest wind, 3 mph94%22%
09:00+10°—2 mphwest wind, 2 mph89%67%
10:00+11°—2 mphwest wind, 2 mph83%100%
11:00+11°0.2 mm4 mphwest wind, 4 mph76%73%
12:00+12°0.2 mm4 mphnorthwest wind, 4 mph71%92%
13:00+13°0.2 mm5 mphnorth wind, 5 mph68%100%
14:00+13°0.3 mm5 mphnorthwest wind, 5 mph68%95%
15:00+13°0.3 mm6 mphnorthwest wind, 6 mph71%82%
16:00+12°0.3 mm6 mphnorthwest wind, 6 mph74%64%
17:00+12°0.3 mm6 mphnorthwest wind, 6 mph78%43%
18:00+11°0.3 mm7 mphnorthwest wind, 7 mph82%25%
19:00+10°0.3 mm8 mphnorthwest wind, 8 mph85%13%
20:00+10°0.1 mm8 mphnorthwest wind, 8 mph87%6%
21:00+10°0.1 mm9 mphnorthwest wind, 9 mph88%2%
22:00+9°0.1 mm9 mphnorthwest wind, 9 mph89%0%
23:00+9°0.1 mm10 mphnorthwest wind, 10 mph89%0%
+13°+10°+6°
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 39 min
UV index
3
moderate
Moon
Waning crescent
Moonrise
02:43
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

+14% in the windowTuesday, September 8
Feeding windows on the day scale, local time0:0012:0024:00
Major periodsMinor periods
  • Minor02:13–03:13Moonrise
  • Major09:58–11:58Moon overhead
  • Minor18:20–19:20Moonset
  • Major22:25–00:00Moon 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?

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