I've stopped using google weather here in the UK as well because of how inaccurate its been over the past few years and have just fallen back on the BBC. Maybe its related, maybe not.
Google does update its forecast more frequently, and usually is as accurate as the others for the hour ahead. And the longer range 3+ day forecasts aren't noticeably worse either. It's just the intermediate 4 - 48 hour stuff that they're surprisingly terrible with, but that's exactly the time period I most care about in everyday use!