Do day games score less than night games in MLB?
Barely. MLB night games average 8.9 total runs and day games average 8.8, a gap of about 0.2 of a run. The "day games are pitcher's duels" reputation is far bigger than the actual effect.
There is a real reason day games trend a touch lower. Shadows creeping across the infield in the late afternoon make picking up the ball genuinely harder, and hitters lose a sliver of an edge. But it is a sliver, not the chasm the broadcast clichΓ© implies.
A fraction of a run separates them. Real, and not worth overhauling a run total for.
The lesson is the same one that runs through most of these pages: the effect that sounds huge in the booth is usually small in the data. Day or night barely moves a total. The temperature, the ballpark, and the two starting pitchers move it far more.
Every number here comes from our own game database: 6,883 MLB games since 2024, rebuilt nightly. We compute rates across all qualifying games, never a cherry-picked window. This is descriptive history, not a prediction, and it updates on its own.
Last recomputed August 22, 2026.