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The UK Bird Atlas

Cetti's Warbler (Cettia cetti)Where and when to see it in the UK

Resident · reporting peaks April to May · Bush Warblers and Allies · BOU category A

Records to 2026-08-16 · build 2026-08-31

Cetti's Warbler (Cettia cetti)
Luiz Lapa from Oeiras, Portugal, CC BY 2.0, via Wikimedia Commons
Peak months
Cetti's Warbler: relative reporting rate by 10 km square, September

Contains OS data © Crown copyright and database right 2026 (grid squares, place names from OS Open Names). Northern Ireland place names: OSNI Open Data, OGL v3.0. County and country boundaries: Office for National Statistics, Open Government Licence v3.0. Coastline: Natural Earth. Bird records from the data partners listed here.

Cetti's Warbler has been recorded in 970 of the 2,971 10 km squares covering UK land (33%) in records to 2026. Resident in the UK. Its strongest squares are in England, Wales and Scotland. Reporting peaks in April to May.

Conservation status: Least Concern (IUCN Red List, LC)
View on the IUCN Red List
Relative to this species' best squares (how classes are calculated)
Very high
29% or more of visits
High
12% to 29%
Moderate
5% to 12%
Low
under 5%
Surveyed, not recorded
at least 20 qualifying visits, no record
Insufficient records
too few visits to say
Lighter fill
Few visits, lower confidence
Small dot
Occasional: a single record, or out of season

Seasonality

Reporting rate by month, relative to the peak month
MonthRelative to peakShare of visitsTypical class
January 39%6%Low
February 48%8%Moderate
March 71%12%High
April 100%16%Very high
May 89%15%Very high
June 63%10%Very high
July 30%5%Low
August 36%6%Low
September 67%11%Very high
October 76%12%High
November 64%11%High
December 45%7%Moderate

Squares with the highest reporting rate in April

SquareWhereShare of visitsClass
NX95Dumfries and Galloway, Scotland100%Very high
NZ32County Durham, England100%Very high
NZ42Stockton-on-Tees, England100%Very high
SD46Lancashire, England100%Very high
SD52Lancashire, England100%Very high
SD61Lancashire, England100%Very high
SE52North Yorkshire, England100%Very high
SE54North Yorkshire, England100%Very high
SH23Gwynedd, Wales100%Very high
SH28Isle of Anglesey, Wales100%Very high

Spotted an error in a square? Report it and it goes into the review queue. Read the methodology for how classes, flags and sensitive-species rules work. Data to 2026.