Birding in September — peak migration drama

The month every keen birder waits for. Rarities arrive on east winds, common migrants reach peak numbers, and seawatching erupts after Atlantic gales.

What's around in September

The headliners — east-coast drift migrants

Easterly winds (anywhere on a NE-E-SE axis), particularly with rain or fog, push huge numbers of common European migrants onto the east coast. Some of those mix in proper rarities. Top-tier sites: Spurn, Flamborough, Filey Brigg, Norfolk coast (Burnham Overy → Cley → Sheringham), Suffolk (Landguard, Minsmere). Northern Isles (Shetland, Fair Isle, Foula, Orkney) get the rarest stuff. Targets:

• Yellow-browed Warbler — small Siberian gem, increasingly annual; mid-Sept onwards.
• Red-breasted Flycatcher, Wryneck, Barred Warbler — classic east-coast drift.
• Common Rosefinch, Bluethroat, Ortolan Bunting — scarce but real.
• Pallas's Warbler, Radde's Warbler, Dusky Warbler — late Sept / early Oct from deep Asia.

Common migration spectacle

The everyday migration is just as good. Visible mornings of meadow pipits, siskins, linnets, swallows moving south. Coastal scrub crammed with willow warblers, chiffchaffs, blackcaps. Hirundines pulling out — last swifts in early Sept, last swallows through the month.

West-coast pelagics

Through the first half of September, Cornish day-boats and Scilly pelagics target Wilson's Petrel, Great Shearwater, Cory's Shearwater, Sabine's Gull. Bookings fill up — plan in advance.

Wader windup

Numbers stay high but diversity tails off through the month. Late Sept brings Pectoral Sandpipers (Yank vagrant; reliable in tiny numbers most autumns), peak Curlew Sandpipers, last main wave of Little Stints.

Where to go in September

1. The east coast in an east wind

Forecast says easterlies + rain? Drop everything, get to the east coast. The classic spots are Spurn (E Yorks), Flamborough Head + Bempton, the Norfolk coast, Landguard / Minsmere in Suffolk. Ideally arrive at dawn the morning after weather hits.

2. The Northern Isles

Mid-Sept onwards, Shetland and Fair Isle become the rarity capital of the UK. If you've never done a Shetland trip, save up — late Sept is the time.

3. West-coast pelagics

The early-Sept window for Wilson's Petrel and Great Shearwater is short but reliable. Scilly pelagics from Sapphire / Spirit of Cornwall sail out from Penzance.

September tips

• Read the forecast obsessively. The right wind on the right coast is everything.
• Check the rare-bird news (RBA, Birdguides) every morning. September is twitchable; a Pallas's at Spurn won't wait.
• Be quiet in coastal scrub. A skulker like Yellow-browed Warbler will fly if you crash through; sit still and let it come to you.
• Don't ignore inland. Reservoir corners, sewage works, gravel pits all hold migrants. Some of the best Pectoral Sandpipers turn up at small inland scrapes.