After much debate and confusion, Lazio v Milan will now kick off at the Olimpico at 15.00 UK time (16.00 local).
The game was originally called off by one authority because of fears over public safety.
Different authorities came together to discuss the situation and the Lega Serie A announced that kick-off was delayed by an hour.
It remains to be seen how many fans will actually be able to reach the Stadio Olimpico in these circumstances.
The original kick-off was 14.00 UK time (15.00 local).
Heavy rain was expected, and the Olimpico staff put down plastic sheeting to protect the pitch yesterday, while drains in the vicinity of the arena were cleared.
However, the extent of the rainfall and strong winds caused problems all over the city, including electricity blackouts, blocked roads and the suspension of the Metro service.