Aquatic Warbler (Acrocephalus paludicola)Where and when to see it in the UK
Status not yet classified · reporting peaks September · Reed Warblers and Allies · BOU category A
Peak months
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.
Aquatic Warbler has been recorded in 12 of the 2,971 10 km squares covering UK land (0%) in records to 2026. Its strongest squares are in England and Wales. Reporting peaks in September.
Conservation status: Vulnerable (IUCN Red List, VU)
View on the IUCN Red List- Very high
- 49% or more of visits
- High
- <1% to 49%
- Moderate
- <1% to <1%
- Low
- under <1%
- 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
Relative to this species' best squares (how classes are calculated)
Seasonality
| Month | Relative to peak | Share of visits | Typical class |
|---|---|---|---|
| January | 0% | <1% | Insufficient records |
| February | 0% | <1% | Insufficient records |
| March | 0% | <1% | Insufficient records |
| April | 0% | <1% | Insufficient records |
| May | 0% | <1% | Insufficient records |
| June | 0% | <1% | Very high |
| July | 0% | <1% | Insufficient records |
| August | 56% | <1% | High |
| September | 100% | <1% | Moderate |
| October | 0% | <1% | Insufficient records |
| November | 0% | <1% | Insufficient records |
| December | 0% | <1% | Insufficient records |
Squares with the highest reporting rate in September
| Square | Where | Share of visits | Class |
|---|---|---|---|
| TQ11 | West Sussex, England | 49% | Very high |
| SW32 | Cornwall, England | <1% | Moderate |
| SU50 | Hampshire, England | <1% | Moderate |
| SV80 | Sea, off Isles of Scilly | <1% | Low |
| SJ28 | Wirral, England | <1% | Surveyed, not recorded |
| ST38 | Newport, Wales | <1% | Surveyed, not recorded |
| SU60 | Hampshire, England | <1% | Surveyed, not recorded |
| SW53 | Cornwall, England | <1% | Surveyed, not recorded |
| SY58 | Dorset, England | <1% | Surveyed, not recorded |
| SY99 | Dorset, England | <1% | Surveyed, not recorded |