Limestone · South / Tipperary, IE

Suir

The weir on the River Suir at Cahir, turbulent water over the stone sill and calm pool below.

A major southern salmon river through Cahir and Clonmel, though the salmon here need conservation put first — the stock in decline, and every migratory fish going back unharmed as a matter of course.

Today · Closed season
Black Gnat
Forecast · Today
Closed season
Out of season. File this water for the right month.
50% projected
Today's fly
Black Gnat
Black Gnat
Conditions on the water · Today
Live gauge
Level
Falling
0.25 m
Dropping after lift
Water temp15.2°C
ClaritySlightly coloured
Weather13°C
WindN 29 km/h
Pressure1002 hPa
Rain · recent0.0 mm
Rain · ahead2.3 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Atlantic Salmon
Ideal
15°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Spring run from March; grilse from late May; main run summer through autumn. The Suir is a substantial river — fish the dropping water 12 to 24 hours after rain.
Where
Beats from Cahir through Clonmel to Carrick-on-Suir. Heads, tails, and named lies on the assigned beat.
Method
Spring: tube on a sink-tip swung deep through the main pools. Summer and autumn: small doubles on a floater across-and-down. Catch-and-release on most beats.
Kit
12 to 13 ft #8 double-hander on the bigger water; 11 ft switch on smaller beats. Floating line plus fast-sink tip. 10 to 12 lb fluoro tippet.
Why this works
September accounts for only ~2% of salmon seasonal activity on this river (based on guide reports and fishery knowledge). Fish are present but encounters are less likely. Conditions are tough, but salmon can always surprise you. Late season — fish are beginning to colour up as spawning approaches. They become more territorial and can take aggressively. Autumnal colours (orange, copper, gold) work well.
Likely species
Hatch timeline · todayPeak at 12pm

12pm(now) — Heather Fly

Stage: Terrestrials on topApproach: Dry flyActivity: 95%
Also:Reed Smut86%Cinnamon Sedge51%Autumn Dun48%
Peak emergence windowWeather boost11 food groups active

Peak activity at 12pm — Heather Fly (Heather Fly, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
CapererHatch
2
3
3
2
Hawthorn FlyHatch
2
2
GrannomHatch
2
2

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

Ranked for today
Atlantic Salmon fly box

Munster Blackwater and neighbouring SW spring rivers: when the water is cold or running high, a tube fly fished deep on a Skagit head or sinking shooting head with a heavier leader finds fish that a floating line can't reach. Comes down to a 9'-10' single-handed rod and small flies on an 8lb tippet once the river drops into summer trim.

Permits & access
Permit required — see local rules.
  • Mix of club and private water
  • Cahir and Ardfinnan are key salmon beats
  • State rod licence required
  • Brown trout C&R on many stretches.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 6
  1. The weir on the River Suir at Cahir, turbulent water over the stone sill and calm pool below.
    Cahir weir of the River Suir
  2. The River Suir east of Gashouse Bridge at Clonmel, a wide smooth-flowing reach flanked by wooded banks.
    The River Suir at Clonmel
  3. The River Suir flowing through open countryside near Cahir, green riparian banks and shallow riffles.
    River Suir near Cahir
  4. The River Suir near Holycross, a wide glide with overhanging trees on the far bank.
    River Suir near Holycross
  5. The River Suir at Holycross with the medieval Abbey reflected in the still water and waterfowl on the surface.
    River Suir at Holycross Abbey
  6. Terrain map of the venue
    Terrain map
About this water

A major southern salmon river through Cahir and Clonmel, though the salmon here need conservation put first — the stock in decline, and every migratory fish going back unharmed as a matter of course. The limestone-enriched water is productive and clear, and it makes for excellent wild brown trout fishing in the upper reaches, with mayfly and olive hatches as reliable as anywhere. Spring and grilse runs still arrive on schedule, and sea trout do well in the estuary and lower river. Fish the pools systematically — sunk-tip in spring, smaller doubles through summer. A river of real trout potential travelling alongside modest, carefully husbanded salmon prospects.

Under the surface

The Suir rises on the Devil's Bit in Tipperary and runs a hundred and eighty-five kilometres south and then east to Waterford Harbour, where it joins the Barrow and the Nore. For most of its length it flows over Carboniferous limestone — turning to Old Red Sandstone toward Waterford — and that lime-rich water makes it one of the great brown-trout rivers of Europe, producing trout in numbers few rivers can match. It is a wide, strong, even-flowing river of clear water, weed-rich glides and defined pools through fertile farmland. The Suir is also a salmon river — it gave up the Irish rod record, a fish of fifty-seven pounds, in 1874 — though, as on so many Atlantic rivers, the stock has declined, the best of it lying downstream of Ardfinnan. The character is classic limestone water. Wading is steady over firm gravel and weed, the clear flow rewarding a careful approach.

Wading: Weed and clear water over firm gravel

Hatches & food

EPA river-invertebrate monitoring on the Suir confirms mayflies, stoneflies, caddis, chironomids and other aquatic diptera, and freshwater crustaceans are present across its extensive monitored reaches - food-presence evidence only, with no record of hatch timing or emergence strength.

  • Limestone
  • Unconfined
  • Pool riffle
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

EPA WFD 2019-2024 — Moderate ecological status; corrected (was Good) 2026-06-18. Source: EPA Ireland WFD 2019-2024 classification (catchments.ie / EDEN).

EPA (Ireland) · IESE_16S021700

The full read · show the working · for Atlantic Salmon · confidence 75%
How the river scores — hydrology factors
Water heightVery Low-2.2
Recent riseNone0.0
Falling after liftDropping Too Far Towards Low Clear+1.0
Water temperatureCool To Moderate+3.5
Time in seasonLate Season-0.7
ClarityClearing+2.4
Hydrology base4.0
Will they take?Neutralcaps the band

Taking mood is fair — clearing, stained water, very low flow.

Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
What would change the calculation
No prolonged stable spell before the current rise.
Directions
Seasons & zones
  • Salmon 17 March → 30 SeptemberC&R
  • Trout 17 March → 30 September

Sea trout: Variable seasonal (2026)

Related guides
Casting instructors near here
Booking & contacts