The Met Office has issued a yellow weather warning for areas of the region as heavy rain is expected.
The warning is in place for west Norfolk and Cambridgeshire on Saturday, October 26 with the weather expected to last until 3pm.
It has warned that there is a small chance of flooding and businesses.
Motorists are advised to drive to the conditions due to surface water build-up and rain reducing visibility.
A statement on the Met Office website said: "There is a small chance of fast flowing or deep floodwater causing danger to life."
A Halloween Carnival Night at the Adrian Flux Areana, King's Lynn, has been moved to Sunday, October 27 because of the weather.
Earlier this month an amber warning was issued for west and north Norfolk for heavy rain with holiday homes evacuated along the coast.
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