Freestone · Granite · Southern Finland / Porvoo Coast, FI

Pernajoki

Pernajoki terrain map
Good · Brown Trout
Klinkhåmer Special · 14-18
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp16.7°C
  • ClarityClear
Today's fly
Klinkhåmer Special
Klinkhåmer Special14-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp16.7°C
ClarityClear
Weather16°C
WindS 9 km/h
Pressure1012 hPa
Rain · recent0.1 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Warm — slow
17°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Good — water clarity is right today, though insect activity could be better.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Calendar permit + river permit
  • Porvoo area access.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Sipoonjoenpuro
15 km
72
Brown trout · Grayling
Vantaanjoki
29 km
74
Brown trout · Pike
Lake Tuusula
30 km
Brown trout · Pike
The full read · show the working · for Brown Trout · confidence 90%
How the 75 is built — score × weight = contribution
Temperature83 × 28%23.2
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 May → 30 September
  • Grayling 1 June → 31 March

    Finnish inland grayling (harjus) rule south of 67°N: closed 1 April – 31 May. Open 1 June – 31 March. Grayling is fully protected in sea areas. Minimum size typically 30-35 cm depending on water. Check Metsähallitus (state waters) or local fishing association permit.

    Closed in spring for spawning.

    Prime sport 1 August → 30 November

Sea trout: Variable seasonal (2026) — East-coast river near Porvoo. Occasional sea trout from the Baltic but not a primary sea-trout destination. Stocks fragile; local guidance required for timing.

Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts