- Ecology: Unknown
- Chemical: Unknown
Rules at a glance
- Free fishing
- Fly only
Water temperature for Grayling
Warm — slow17°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Water at 17.1°C — above the grayling caution line (17°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayQuiet day
Hatch predictions
See the full hour-by-hour hatch timeline with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Grayling seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Permits & access
Permit required — see local rules.
- Local fiskekort required from Inatur.no or local river manager
- Inland trout-and-grayling rules apply; this is not an anadromous salmon river
- No national salmon fee.
What's coming
Plan ahead
5-day outlook
Water here around 17°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
Terrain map
Water quality (WFD)
The full read · show the working · for Grayling · confidence 80%
How the 32 is built — score × weight = contribution
Temperature23 × 28%6.4
Flow55 × 22%12.1
Clarity45 × 18%8.1
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity32 × 12%3.8
Limiting factor: Water temperature (17.1°C) is outside Grayling's preferred range (4–14°C)= 48
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Renaelvaproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 4–14 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts
Hemsila
Water temperature for Grayling
Warm — slow17°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Water at 17.1°C — above the grayling caution line (17°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayQuiet day
Hatch predictions
See the full hour-by-hour hatch timeline with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Grayling seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Permits & access
Permit required — see local rules.
- Local fiskekort required from Inatur.no or local river manager
- Inland trout-and-grayling rules apply; this is not an anadromous salmon river
- No national salmon fee.
What's coming
Plan ahead
5-day outlook
Water here around 17°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
Terrain map
Water quality (WFD)
- Ecology: Unknown
- Chemical: Unknown
The full read · show the working · for Grayling · confidence 80%
How the 32 is built — score × weight = contribution
Temperature23 × 28%6.4
Flow55 × 22%12.1
Clarity45 × 18%8.1
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity32 × 12%3.8
Limiting factor: Water temperature (17.1°C) is outside Grayling's preferred range (4–14°C)= 48
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Renaelvaproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 4–14 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts