"It is really devastating. We lost Sam and Jack to crashes. I was caught behind three or four big crashes and I saw at least 20 different crashes. I've never seen anything like it.
"It was complete blanket rain and flooding everywhere. It was really cold. But when you are in the rain for four or five hours you are freezing that that was the death of me today. It's not the same for everyone but I am the smallest guy in the peloton,'' said the diminutive 58kg rider.
"You are just out there freezing on your own and there's not much you can do about it. It would have been a very different race if it was dry.''
Curiously, the conditions improved on the final lap with the sun coming out.
Earlier, deafening thunderstorms reduced the race to a crash-fest which accounted for Orica GreenEDGE rider Bewley who changed bikes before being forced out.
The in-form Bauer, who was primed to ride for Bennett today, also crashed after being brought down by a rider in front of him. He changed bikes and was brought down in another crash just before the start of the Fiesole circuit.
It was a day of firsts with Portugal's Rui Da Costa outsprinting Spaniard Joaquin Rodriguez on the line to give his country its first rainbow jersey in the road race. Another Spanish rider, Alejandro Valverde was third ahead of home country hope Vincenzo Nibali, who recovered from an early crash to finish fourth.
Bennett will recover before a busy final two weeks of the season with World Tour races in Milan and Lombardia this week, the Paris-Tours next week ahead of the final race in the Tour of Beijing.
Results: Rui Da Costa (POR) 7:25.44, 1; Joaquin Rodriguez (ESP) same time, 2; Alejandro Valverde (ESP) 7:26.00, 3; Vincenzo Nibali (ITA) same time, 4; Andriy Grivko (UKR) at 31s, 5; Peter Sagan (SVK) at 34s, 6; Simon Clarke (AUS) same time, 7; Maxim Iglinskiy (KAZ) st, 8; Philippe Gilbert (BEL) st, 9; Fabian Cancellara (SUI) st, 10. Also NZers: Sam Bewley, Jack Bauer, George Bennett dnf.