weather.com leans toward the negative as well: 60% chance of rain at first pitch declining over normal playing time to 30% at 22.00. Also predictions of 40-50% chance in the run-up to first pitch.
...and now, unusually for weather.com, they have increased the chance of rain to 80% at first pitch. Usually they back off from such predictions.
From 22.00 it's expected to be round 25% chance of precip on into the wee hours.