If you haven't been down to the Pier lately, let me be the first to tell you that the berms are being built. And if you weren't in town for the last El Nino winter (I was) be prepared for rain. Lots of rain. It will be wet. Very wet. Here's some things you can do to prepare.
Roof: you will not be able to get a roofing company to replace your roof, they are all booked for the next 3-6 months. But you may be able to get someone out for a "tune-up" or to at least arrange for some blue tarp if you are expecting leaks. If you do get any leaks call a remediation company immediately so as not to get any mold or at least litigate the damage.
Garage: make sure the garage door is flush all around. We all store things in the garage that we would prefer to not get wet. If your driveway slopes down towards the garage make sure you have proper drainage or even sandbags. Really.
Subterranean: Is any of your home below street level? Best to check that everything is waterproof and you get no intrusion.
Drainage: Do you have rain gutters? Are they cleaned out? You want to make sure that all drainage flows away from your house and not towards it.