To find precipitation data on our site, look right below the current conditions for your location and you should see a tab labeled "Current Data". You can find current precipitation and data for the current day. Lower on the page you'll find more precipitation data under "History and Almanac". This allows you to view a more detailed listing of the current day's data or to pick a day in the past. Be careful if you choose to add up precipitation data from the hourly column, because the readings are cumulative for every hour, but are sometimes recorded more frequently.
You can find the 6-hour precipitation forecast for your city by clicking on the % Chance of Precip in the "Today" section right below the current conditions.