[UPDATE: Raw data (pdf), if you insist on doing detailed analysis on incredibly noisy numbers.]
As always, I want to point out that month-to-month ridership reports don’t mean very much and are subject to seasonal variations and small-sample-size issues.
Nevertheless, weekday boardings slipped from 14,931 to 14,852 from August to September. Weekend numbers (and more) are in Scott Gutierrez’s post at the P-I. If I had to speculate, I’d say the week and a half of operations post bus changes, plus school opening, were canceled out by fewer and fewer things to do downtown as we head into fall, plus a reduction in joy riding.
In other news, the automated passenger counting system is fixed.