Swallows.

[Sparky]

It must be summer, the swallows have arrived .

[sws97sdg]

There is nothing more quintessentially summer then swallows and swifts flying around the Mediterranean with their piercing calls, love sitting in the square listening to them in the evening!

[Tangoman]

Yes, swallows, harbingers of warm weather to come.

Spotted the first 2 here at home about 6 days ago, but they haven't been seen since, and it's coming down like stairrods now. Maybe we need a web cam!!