Between the 1999 and 2012 seasons, the Philadelphia Phillies had their best record in a month in the month of September in September 2010, with a record of 21-6.
| TEAM | REC | MONTH | W% | G | W | L | AB | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | PA | TB | XBH | SH | SF | IBB | GIDP | AVG | OBP | SLG | OPS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Phillies | 21-6 | September 2010 | .778 | 27 | 21 | 6 | 920 | 142 | 263 | 50 | 3 | 35 | 138 | 102 | 17 | 169 | 28 | 4 | 1,050 | 424 | 88 | 8 | 3 | 14 | 26 | .286 | .367 | .461 | .827 |
| 2 | | Phillies | 19-8 | September 2004 | .704 | 27 | 19 | 8 | 968 | 158 | 274 | 57 | 3 | 37 | 149 | 112 | 6 | 181 | 21 | 6 | 1,104 | 448 | 97 | 8 | 10 | 8 | 20 | .283 | .358 | .463 | .820 |
| 3 | | Phillies | 17-8 | September 2008 | .680 | 25 | 17 | 8 | 819 | 138 | 215 | 49 | 7 | 32 | 129 | 85 | 10 | 158 | 26 | 5 | 938 | 374 | 88 | 15 | 9 | 9 | 17 | .263 | .336 | .457 | .793 |
| 4 | | Phillies | 18-10 | September 2006 | .643 | 28 | 18 | 10 | 1,010 | 158 | 281 | 46 | 12 | 40 | 151 | 128 | 17 | 215 | 12 | 4 | 1,178 | 471 | 98 | 17 | 6 | 26 | 10 | .278 | .367 | .466 | .833 |
| 5 | | Phillies | 17-10 | September 2012 | .630 | 27 | 17 | 10 | 897 | 131 | 228 | 46 | 5 | 25 | 128 | 95 | 12 | 191 | 19 | 2 | 1,025 | 359 | 76 | 12 | 9 | 15 | 17 | .254 | .331 | .400 | .731 |
| 6 | | Phillies | 17-11 | September 2007 | .607 | 28 | 17 | 11 | 975 | 156 | 248 | 42 | 10 | 41 | 146 | 131 | 16 | 230 | 26 | 2 | 1,147 | 433 | 93 | 15 | 10 | 15 | 19 | .254 | .349 | .444 | .793 |
| 7 | | Phillies | 17-13 | September 2009 | .567 | 30 | 17 | 13 | 1,001 | 140 | 254 | 55 | 8 | 35 | 134 | 99 | 13 | 201 | 24 | 5 | 1,130 | 430 | 98 | 11 | 6 | 11 | 18 | .254 | .327 | .430 | .757 |
| 8 | | Phillies | 15-12 | September 2005 | .556 | 27 | 15 | 12 | 974 | 169 | 282 | 63 | 8 | 34 | 159 | 123 | 8 | 198 | 30 | 4 | 1,121 | 463 | 105 | 8 | 8 | 13 | 11 | .290 | .371 | .475 | .846 |
| 9 | | Phillies | 16-14 | September 2011 | .533 | 30 | 16 | 14 | 1,057 | 114 | 262 | 40 | 8 | 23 | 109 | 100 | 9 | 193 | 12 | 2 | 1,186 | 387 | 71 | 14 | 6 | 10 | 24 | .248 | .317 | .366 | .683 |
| 10 | | Phillies | 13-13 | September 2003 | .500 | 26 | 13 | 13 | 887 | 147 | 238 | 50 | 6 | 30 | 144 | 103 | 6 | 167 | 17 | 3 | 1,010 | 390 | 86 | 11 | 3 | 9 | 21 | .268 | .347 | .440 | .787 |
| 11 | | Phillies | 11-11 | September 2001 | .500 | 22 | 11 | 11 | 710 | 89 | 162 | 27 | 5 | 25 | 82 | 88 | 6 | 138 | 21 | 7 | 820 | 274 | 57 | 9 | 7 | 11 | 15 | .228 | .316 | .386 | .702 |
| 12 | | Phillies | 12-15 | September 2002 | .444 | 27 | 12 | 15 | 942 | 107 | 249 | 57 | 7 | 20 | 103 | 101 | 6 | 156 | 19 | 9 | 1,071 | 380 | 84 | 17 | 5 | 15 | 13 | .264 | .338 | .403 | .741 |
| 13 | | Phillies | 9-19 | September 1999 | .321 | 28 | 9 | 19 | 952 | 114 | 240 | 40 | 8 | 19 | 104 | 94 | 8 | 184 | 23 | 4 | 1,071 | 353 | 67 | 8 | 9 | 6 | 21 | .252 | .322 | .371 | .693 |
| 14 | | Phillies | 9-20 | September 2000 | .310 | 29 | 9 | 20 | 957 | 119 | 227 | 44 | 11 | 16 | 105 | 112 | 8 | 204 | 22 | 6 | 1,099 | 341 | 71 | 14 | 8 | 7 | 21 | .237 | .320 | .356 | .676 |
Some of the information used here was obtained free of charge from Retrosheet.
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