I mean, if people are going there on a trip, they will likely still go, but it may keep locals away. My friend went at the beginning of January when LA got POUNDED with rain. He said it was REALLY bad, but they were prepared (and all adults) and it got better later in the day and they had the parks to themselves by that point. Front row for everything, no lines, but they had to deal with some pretty bad storms and didn't have young kids to wrangle.