Mayflies
- Ecology: Good
- Chemical: Unknown
WFD classification · NO002-1666-R
Rules at a glance
- Permit required
Water temperature for Grayling
Ideal12°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
August through September is prime — Norwegian grayling fishing is at its best in late summer when olives and sedges bring fish up. Mid-day rises in cooler weather; long daylight stretches the fishable window.
Where
Glomma's grayling water at Kvennan is wide and demanding. Gravel runs, the heads of riffles, and deeper glide tails. Find the shoals; wade carefully.
Method
Dry to risers with sedges, olives, and the late-summer spinner falls. Euro-nymphing through the deeper pockets when fish aren't up. Long fine tippet — Glomma grayling are wary in clear water.
Kit
9 to 10 ft #4 for dries; 10 ft #3 nymphing rod for the deep pockets. Floating line, 12 ft leader to 4 to 5 lb fluoro tippet.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds 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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1
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 for the Kvennan beat or controlling association
- Inland trout-and-grayling rules apply here; this is not an anadromous salmon river requiring the national salmon fee.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
River at Dusk Terrain map
Water quality (WFD)
The full read · show the working · for Grayling · confidence 75%
How the 68 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity45 × 18%8.1
Feeding Time30 × 13%3.9
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 68
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts
Glomma (Kvennan)
Water temperature for Grayling
Ideal12°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
August through September is prime — Norwegian grayling fishing is at its best in late summer when olives and sedges bring fish up. Mid-day rises in cooler weather; long daylight stretches the fishable window.
Where
Glomma's grayling water at Kvennan is wide and demanding. Gravel runs, the heads of riffles, and deeper glide tails. Find the shoals; wade carefully.
Method
Dry to risers with sedges, olives, and the late-summer spinner falls. Euro-nymphing through the deeper pockets when fish aren't up. Long fine tippet — Glomma grayling are wary in clear water.
Kit
9 to 10 ft #4 for dries; 10 ft #3 nymphing rod for the deep pockets. Floating line, 12 ft leader to 4 to 5 lb fluoro tippet.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds 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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1
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 for the Kvennan beat or controlling association
- Inland trout-and-grayling rules apply here; this is not an anadromous salmon river requiring the national salmon fee.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
River at Dusk Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · NO002-1666-R
The full read · show the working · for Grayling · confidence 75%
How the 68 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity45 × 18%8.1
Feeding Time30 × 13%3.9
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 68
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts