Fans are warned to leave more time to reach the circuit and to expect to walk further as parking is still affected.
Silverstone managing director Richard Phillips said: "[It] will be a bit of a challenge, but please bear with us, we are going to do our best."
Phillips had appealed for ticket holders to remain at home and miss Saturday's qualifying after conditions meant thousands were left queuing in their cars for hours on Friday, missing practice sessions.
Drivers struggle at slippy Silverstone
And track managers issued a statement thanking fans for staying away and allowing contingency plans to be carried out.
"Silverstone would like to thank fans that heeded the circuit's advice and did not come the British Grand Prix on Saturday," the statement read.
"While it was an extremely difficult decision, and one that will have disappointed people that had to stay away, the decision gave the circuit a fighting chance to repair and get previously unsafe car parks into a state that can be used on race day.
"The circuit has implemented further contingency plans throughout Friday night and Saturday.
"As a result, it is now in a stronger position to accommodate all ticket holders coming to Silverstone on Sunday."
All campsites are full and fans are advised not to arrive on Saturday night even if they have a pre-booked place.
Silverstone traffic hotline
0844 372 8300
Silverstone have also recommended that spectators travel by 4x4, motorcycle or car share, where possible.
Officials closed 50% of the circuit's parking on Saturday in an attempt to allow it to dry out. Up to 125,000 fans are expected for the race on Sunday.
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