Yeah, the Met Office and BBC (which I believe use data from Meteo France) are both much more accurate for "later today" weather than Google for me in London.

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!