It sounds so sixties...

Weather Underground sounds subversive but seems to be the commercial spinoff of a university project.

Here are links for Thousand Oaks and Pasadena.

The bad part is that their TO data kinda sucks. The data comes from Camarillo which is only about ten to twelve miles away, but it's also 900 (or more) feet lower in altitude (sitting on the Ventura coastal plain), which makes a big difference. Our wind patterns are different and we've usually got some sort of a temperature gradient (sometimes its hotter, sometimes not).

I looked around to see if they are looking to add amateur stations (that would be interesting), but it doesn't see to be the case.