Stoneflies
Gammarids
- Ecology: Good
- Chemical: Unknown
WFD classification · FRGR1338
Rules at a glance
- Day tickets
Water temperature for Grayling
Ideal13°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn through November prime — the Sioule is one of France's premier grayling rivers. Cold midday days bring fish up.
Where
Faster gravel runs and the heads of riffles through the middle and lower river. Deeper glide tails as autumn cold pushes fish deeper.
Method
Euro-nymphing through the deeper pockets is the daily default; switch to dries on autumn afternoons when sedges and small olives come off. Long fine tippet for the clear water.
Kit
10 ft #3 nymphing rod for the deep pockets; 9 ft #4 for dries. 4 to 5 lb fluoro tippet, 12 ft leader.
Likely species
Hatch timeline · tomorrowPeak at 18h
12h(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 35%
Also:Daddy Long Legs27%Autumn Needle Fly25%Cinnamon Sedge23%
Peak emergence windowWeather boost9 food groups active
Peak activity at 18h — Caperer (Caperer, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
1
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Carte de pêche AAPPMA
- Réglementation d'Auvergne.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Gorges de la Sioule, Puy-de-Dôme Terrain map
Water quality (WFD)
The full read · show the working · for Grayling · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 2e Saturday de March → 3e Sunday de September
- Grayling 3e Saturday de May → 3e Sunday de September
France national rule: grayling opens 3rd Saturday of May in all waters. In 1st category (salmonid) rivers, grayling closes with the trout season on the 3rd Sunday of September. Departmental regulations may impose additional restrictions. Always check the relevant département's 2026 arrêté préfectoral.
Related guides
Booking & contacts
Sioule
Water temperature for Grayling
Ideal13°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn through November prime — the Sioule is one of France's premier grayling rivers. Cold midday days bring fish up.
Where
Faster gravel runs and the heads of riffles through the middle and lower river. Deeper glide tails as autumn cold pushes fish deeper.
Method
Euro-nymphing through the deeper pockets is the daily default; switch to dries on autumn afternoons when sedges and small olives come off. Long fine tippet for the clear water.
Kit
10 ft #3 nymphing rod for the deep pockets; 9 ft #4 for dries. 4 to 5 lb fluoro tippet, 12 ft leader.
Likely species
Hatch timeline · tomorrowPeak at 18h
12h(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 35%
Also:Daddy Long Legs27%Autumn Needle Fly25%Cinnamon Sedge23%
Peak emergence windowWeather boost9 food groups active
Peak activity at 18h — Caperer (Caperer, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
1
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Carte de pêche AAPPMA
- Réglementation d'Auvergne.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Gorges de la Sioule, Puy-de-Dôme Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · FRGR1338
The full read · show the working · for Grayling · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 2e Saturday de March → 3e Sunday de September
- Grayling 3e Saturday de May → 3e Sunday de September
France national rule: grayling opens 3rd Saturday of May in all waters. In 1st category (salmonid) rivers, grayling closes with the trout season on the 3rd Sunday of September. Departmental regulations may impose additional restrictions. Always check the relevant département's 2026 arrêté préfectoral.
Related guides
Booking & contacts