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

Bite forecast: River Afon Hepste

  • length 9 km
  • Flows into River Mellte
Loading map…

Best fishing days for the next week

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

    Cloudy: 12–19 °C

  2. WednesdaySeptember 9weather-based forecast
    62/100high activity

    Partly cloudy: 7–13 °C

  3. ThursdaySeptember 3weather-based forecast
    60/100high activity

    Cloudy: 15–19 °C

River Afon Hepste (Powys) — one of the area's fishing spots. About 9 km long. Flows into River Mellte. 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.

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.

DaceEuropean eelGraylingPikeWhitefishBarbelRuffeZanderAtlantic salmonBreamWels catfishPerchRainbow troutBrown troutCarpIdeChubCrucian carpRoachWhite breamBleakRuddTench

Atlantic salmon

7/10 · Good

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 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 12 °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 °C12 °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 flat: it moves no more than 1 hPa over the day, so the weather isn't shifting today's bite.

Pressure through the day, 1 hPa change
00:00 · 101323:00 · 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 active season for Atlantic salmon here.

JFMAMJJASOND

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

9 SepWednesday, September 9
+12°

Partly cloudy · feels like +9°

Low / high
+7°…+13°
Precipitation
0.1 mm
Wind
11 mph NW
Cloud cover
56%
Humidity
68%
Pressure
1016 hPa
00:00+9°0.1 mm11 mphwest wind, 11 mph90%0%
01:00+8°0.1 mm11 mphwest wind, 11 mph90%0%
02:00+8°—11 mphwest wind, 11 mph91%1%
03:00+7°—10 mphnorthwest wind, 10 mph92%3%
04:00+7°—10 mphnorthwest wind, 10 mph93%6%
05:00+7°—9 mphnorthwest wind, 9 mph93%9%
06:00+7°—9 mphnorthwest wind, 9 mph93%12%
07:00+7°—9 mphnorthwest wind, 9 mph91%14%
08:00+8°—8 mphnorthwest wind, 8 mph87%16%
09:00+9°—8 mphnorthwest wind, 8 mph81%17%
10:00+10°—8 mphnorthwest wind, 8 mph75%19%
11:00+11°0.0 mm10 mphnorthwest wind, 10 mph70%35%
12:00+12°0.1 mm11 mphnorthwest wind, 11 mph68%56%
13:00+13°0.1 mm13 mphnorthwest wind, 13 mph68%78%
14:00+13°—14 mphwest wind, 14 mph71%100%
15:00+12°—13 mphwest wind, 13 mph71%100%
16:00+12°—12 mphwest wind, 12 mph72%100%
17:00+12°—11 mphwest wind, 11 mph73%100%
18:00+11°—10 mphwest wind, 10 mph75%100%
19:00+11°—9 mphwest wind, 9 mph76%100%
20:00+11°—8 mphwest wind, 8 mph77%100%
21:00+10°—7 mphwest wind, 7 mph78%100%
22:00+10°—7 mphsouthwest wind, 7 mph80%100%
23:00+10°—6 mphsouthwest wind, 6 mph81%100%
+13°+10°+7°
Weather throughout the day
0:006:0012:0018:0023:00

Sun and moon

Wednesday, September 9
The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
DaylightMoon above the horizon
Sunrise
06:37
Sunset
19:42
Day length
13 h 5 min
Sunshine hours
11 h 33 min
UV index
4
moderate
Moon
Waning crescent
Moonrise
04:13
Moonset
19:07

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 windowWednesday, September 9
Feeding windows on the day scale, local time0:0012:0024:00
Major periodsMinor periods
  • Minor03:43–04:43Moonrise
  • Major10:51–12:51Moon overhead
  • Minor18:37–19:37Moonset

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 Hepste0.6 mi
  • Afon Mellte1 mi
  • Porth yr Ogof Main Stream1 mi
  • River Neath2 mi
  • Sychryd3 mi
  • River Mellte3 mi
  • Dringarth River4 mi
  • Taf Fawr4 mi

Nearby water bodies

  • ReservoirPenderyn Reservoir3 mi
  • ReservoirNant Moel Reservoir3 mi
  • ReservoirNant Hir Reservoir4 mi
  • ReservoirLlwyn-onn Reservoir4 mi
  • ReservoirCantref Reservoir4 mi