Predisaster Hazard Mitigation Act of 2008 - Amends the Robert T. Stafford Disaster Relief and Emergency Assistance Act to require the President to: (1) award financial assistance under the pre-disaster hazard mitigation program on a competitive basis; and (2) ensure that the amount of assistance made available to each state is not less than the lesser of $575,000 or the amount that is equal to 1% of the total funds appropriated to carry out such program for the fiscal year, and is not more than 15% of such appropriated funds.
Authorizes appropriations for the program for FY2009-FY2013. Repeals the program termination date.
Prohibits a state from using more than 25% of the financial assistance made available to the state under the program in a fiscal year for flood control projects.