You've got low pressure coming down from the north, and the North Bay is where you'll see most of the activity. Then it will move across the region. As a result, almost all areas of the Bay Area should see at least a little bit of rain by Wednesday. Some areas of the region will get their first taste of it Monday night, according to the weather service.
Today will bring sunny spells and showers, with some heavy showers in the mix as well. The 80,000 revellers flocking to Stradbally should keep the raincoats and wellies handy. The north and west of the country will get the worst of the rain, while there will be more sunshine in the east and southeast. Highest temperatures will be between 15 and 20C.