"Real"... okay, let's look at 2K5. It rained in Skydome last year. And I have this feeling that wasn't fixed, because I don't believe the programmers even considered that an issue. Plus all default games were played in 20 degree weather. And that's not 20 "balmy Canadian" degrees, but 20 "base-ballfreezing American" degrees.
And this is why I prefer "baseball only", and why I'm guessing "no" to your hopes.