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The UK Bird Atlas

River Warbler (Locustella fluviatilis)Where and when to see it in the UK

Scarce migrant · reporting peaks June · Grasshopper Warblers, Grassbirds, and Allies · BOU category A

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

River Warbler (Locustella fluviatilis)
Lasse Olsson, CC BY-SA 3.0, via Wikimedia Commons

Too few records to rate squares by month. Each marked square has at least one record; the table below gives the count and years.

River 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.

River Warbler has been recorded in 14 of the 2,971 10 km squares covering UK land (0%) in records to 2026. Scarce migrant in the UK. Reporting peaks in June.

Conservation status: Least Concern (IUCN Red List, LC)
View on the IUCN Red List

Records by 10 km square

SquareWhereRecordsYearsVerified
HU36Shetland Islands, Scotland82023unverified
HU67Sea, off Shetland Islands62022unverified
ST43Somerset, England2142021unverified
ST44Somerset, England122021unverified
ST33Somerset, England12021unverified
HZ27Shetland Islands, Scotland92007 to 2020unverified
HU43Shetland Islands, Scotland32010 to 2018unverified
HP60Shetland Islands, Scotland32018unverified
HP51Shetland Islands, Scotland32018unverified
HY75Sea, off Orkney Islands12013unverified
TM49Norfolk, England342010unverified
HU31Shetland Islands, Scotland32010unverified
NG74Highland, Scotland42009unverified
TV59East Sussex, England52008unverified

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.