best record in the mlb in september all-time single season

The Chicago Whales have the best record by a team in the month of September, with a record of 34-18.

	TEAM	REC	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	Whales	34-18	.654	56	34	18	1,781	233	472	64	27	15	203	196	8		65		2,053	635	106	68				.265	.341	.357	.697
2	Blues	33-20	.623	56	33	20	1,834	229	477	56	25	11	185	139	9		86		2,027	616	92	45				.260	.315	.336	.651
3	Yankees	1881-1371	.578	3,272	1,881	1,371	110,356	15,321	28,827	4,724	915	2,786		11,467	816		2,019	416	124,671	43,739	8,425	1,603	495	481	1,731	.261	.334	.396	.730
4	Giants	2025-1730	.539	3,806	2,025	1,730		17,137										488			8,236		481	654	1,664		.327		.712
5	Dodgers	1998-1739	.535	3,777	1,998	1,739		16,719										571			7,867		505	641	1,663		.324		.700
6	Cardinals	1828-1709	.517	3,575	1,828	1,709		15,537										647			8,168		553	636	1,719		.325		.704
7	Guardians	1698-1563	.521	3,288	1,698	1,563	111,589	14,584	29,414	5,155	939	2,260		10,344	833		2,076	554	125,057	43,227	8,354	1,861	578	427	1,707	.264	.329	.387	.716
8	Terriers	28-26	.519	57	28	26	1,803	224	470	72	26	7	185	209	17		70		2,119	615	105	90				.261	.343	.341	.684
9	Blue Jays	645-610	.514	1,255	645	610	42,715	5,638	10,899	2,142	253	1,285	5,304	3,965	395	8,355	744	283	47,659	17,402	3,680	246	338	237	961	.255	.322	.407	.729
10	Astros	840-809	.509	1,650	840	809	55,957	6,895	14,171	2,566	350	1,356	6,479	5,239	460	10,420	1,157	476	62,769	21,505	4,272	690	423	538	1,200	.253	.320	.384	.704
11	Red Sox	1662-1620	.506	3,306	1,662	1,620	112,683	14,840	29,671	5,368	951	2,221		11,184	804		1,672	417	126,947	43,604	8,540	1,771	538	476	1,913	.263	.333	.387	.720
12	Pirates	1904-1878	.503	3,821	1,904	1,878		16,766										531			8,077		534	657	1,661		.326		.704
13	Tigers	1658-1629	.504	3,310	1,658	1,629	112,410	14,890	29,760	4,768	1,066	2,310		10,921	741		1,998	435	126,309	43,590	8,144	1,947	499	402	1,841	.265	.333	.388	.720
14	White Sox	1635-1634	.500	3,298	1,635	1,634	111,370	14,057	28,991	4,678	939	1,968		10,528	889		2,440	592	125,440	41,451	7,585	2,116	537	386	1,813	.260	.328	.372	.700
15	Reds	1860-1859	.500	3,763	1,860	1,859		16,161										527			7,833		477	563	1,631		.321		.694
16	Nationals	756-764	.497	1,520	756	764	51,332	6,359	12,972	2,511	345	1,238	5,973	4,872	392	9,931	1,134	475	57,667	19,887	4,094	686	385	556	1,070	.253	.320	.387	.707
17	Rebels	27-28	.491	55	27	28	1,756	204	458	57	30	10	172	145	12		62		1,983	605	97	70				.261	.321	.345	.666
18	Cubs	1914-1893	.503	3,850	1,914	1,893		17,122										471			7,873		468	581	1,658		.320		.695
19	Twins	1609-1688	.488	3,314	1,609	1,688	112,209	14,055	29,137	4,743	1,068	1,830		10,544	875		2,151	515	125,690	41,506	7,641	1,693	536	415	1,815	.260	.327	.370	.697
20	Rockies	395-417	.486	812	395	417	28,034	4,235	7,670	1,487	225	960	4,018	2,607	268	6,297	502	211	31,457	12,487	2,672	341	207	204	640	.274	.339	.445	.784
21	Brewers	718-764	.484	1,483	718	764	50,157	6,469	12,668	2,391	285	1,409	6,122	4,955	416	9,951	1,021	419	56,438	19,856	4,085	524	386	353	1,069	.253	.323	.396	.718
22	Braves	1916-1920	.499	3,892	1,916	1,920		16,771										481			7,575		496	626	1,678		.318		.684
23	Royals	730-778	.484	1,508	730	778	51,674	6,581	13,561	2,459	403	1,186	6,205	4,408	390	9,306	1,286	476	57,298	20,384	4,048	379	447	299	1,146	.262	.323	.394	.717
24	Tip-Tops	28-30	.483	59	28	30	1,950	245	515	75	29	16	210	163	18		77		2,191	696	120	60				.264	.327	.357	.684
25	Mets	815-884	.480	1,701	815	884	57,387	6,951	14,171	2,510	315	1,444	6,519	5,502	494	11,382	969	469	64,479	21,643	4,269	662	434	532	1,239	.247	.316	.377	.693