This is normal beach procedure even in the summer.

BBC: An icy dip off the coast of NYC

The prudent use of coastal development setbacks or establishing a safe distance between buildings and the active beach zone can ensure that space is provided for a beach to move naturally, both during normal events and infrequent hurricanes, thereby ensuring the beach is conserved for all to enjoy and that coastal infrastructure remains intact.

UNESCO: Introduction

However, despite removing warning signs, it added that beach users should exercise caution until the sewage network was back to normal.

BBC: Torbay sewage pumping 'not affecting beach water quality'