- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110060036284
Water temperature for Sea Trout
Warm — slow17°C est.ideal 8–15°C
0°14°28°
How to fish it · for Sea Trout
When
From dusk into the first half of the night.
Where
Deeper pools and slower glides · hold water and current seams.
Method
Fish dark patterns on a sink-tip or lightly sunk line, especially near structure.
Kit
10 ft #6/7 rod, floating line with a sink-tip option, 8–10 lb fluoro tippet for the swing.
Why this works
Fair — barometric pressure is working for you, but water temperature is the limiting factor today.
Hatch timeline · todayPeak at 11 Uhr
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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 · 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
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Sea Trout
Top
1-2 inch · Tube
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
8-12 · Streamer
Slim and mobile — fished sunk through the pool when surface work is not producing. Consistently takes fish that will not come to the surface.
2-4 inch · Streamer
A mobile eel-like profile that undulates through deep pools — effective when sea trout are lying deep and not responding to conventional wets.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Taf — image via Wikipedia (River Taf) Terrain map
Water quality (WFD)
The full read · show the working · for Sea Trout · confidence 65%
How the river scores — hydrology factors
Water heightMedium Ideal+3.4
Recent riseClear Recent Rise+8.8
Falling after liftStill Rising Hard-0.6
Water temperatureCool To Moderate+3.5
Time in seasonLate Season+2.3
ClarityClearing+2.4
Hydrology base19.8
Rules that fired
Rise Plus Good Temp Bonus+0.75
Will they take?Willingcaps the band
Fish should be willing to take — clearing, stained water, fresh fish moving on the lift.
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
No prolonged stable spell before the current rise.
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — NRW At Risk classification. Compact South Wales river with sewin runs from June. Stocks are marginal under current At Risk rating — night fishing in warm summer conditions is the productive window when water is right.
Salmon: Negligible (2026) — NRW / EA 2024 Salmon Stocks Assessment classifies this Welsh principal salmon river 'at risk' — egg deposition below Conservation Limit. All Wales byelaws (in force 2020-2030) make catch & release mandatory. Conservation priority; not a salmon fishing destination. The Taf carries small numbers of salmon; classified at risk.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
River Taf
Water temperature for Sea Trout
Warm — slow17°C est.ideal 8–15°C
0°14°28°
How to fish it · for Sea Trout
When
From dusk into the first half of the night.
Where
Deeper pools and slower glides · hold water and current seams.
Method
Fish dark patterns on a sink-tip or lightly sunk line, especially near structure.
Kit
10 ft #6/7 rod, floating line with a sink-tip option, 8–10 lb fluoro tippet for the swing.
Why this works
Fair — barometric pressure is working for you, but water temperature is the limiting factor today.
Hatch timeline · todayPeak at 11 Uhr
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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 · 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
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Sea Trout
Top
1-2 inch · Tube
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
8-12 · Streamer
Slim and mobile — fished sunk through the pool when surface work is not producing. Consistently takes fish that will not come to the surface.
2-4 inch · Streamer
A mobile eel-like profile that undulates through deep pools — effective when sea trout are lying deep and not responding to conventional wets.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Taf — image via Wikipedia (River Taf) Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110060036284
The full read · show the working · for Sea Trout · confidence 65%
How the river scores — hydrology factors
Water heightMedium Ideal+3.4
Recent riseClear Recent Rise+8.8
Falling after liftStill Rising Hard-0.6
Water temperatureCool To Moderate+3.5
Time in seasonLate Season+2.3
ClarityClearing+2.4
Hydrology base19.8
Rules that fired
Rise Plus Good Temp Bonus+0.75
Will they take?Willingcaps the band
Fish should be willing to take — clearing, stained water, fresh fish moving on the lift.
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
No prolonged stable spell before the current rise.
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — NRW At Risk classification. Compact South Wales river with sewin runs from June. Stocks are marginal under current At Risk rating — night fishing in warm summer conditions is the productive window when water is right.
Salmon: Negligible (2026) — NRW / EA 2024 Salmon Stocks Assessment classifies this Welsh principal salmon river 'at risk' — egg deposition below Conservation Limit. All Wales byelaws (in force 2020-2030) make catch & release mandatory. Conservation priority; not a salmon fishing destination. The Taf carries small numbers of salmon; classified at risk.
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators