The Seattle Mariners had the highest on-base percentage by a team last month, with an on-base percentage of .334.

	TEAM	OBP	MONTH	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Mariners	.334	September 2025	25	.680	17	8	850	139	220	48	2	43	132	85	17	225	26	5	966	401	93	3	11	9	18	.259	.472	.806
2	Phillies	.334	September 2025	25	.680	17	8	854	128	229	43	4	42	128	81	9	234	11	6	957	406	89	2	11	4	16	.268	.475	.809
3	Brewers	.334	September 2025	24	.500	12	12	816	103	206	41	3	17	95	91	13	186	23	5	931	304	61	2	9	1	21	.252	.373	.706
4	Yankees	.333	September 2025	26	.692	18	8	857	131	216	35	1	42	129	100	9	266	24	10	975	379	78	0	9	8	17	.252	.442	.776
5	Diamondbacks	.332	September 2025	24	.500	12	12	806	111	208	41	5	24	104	83	12	196	21	9	922	331	70	10	11	5	17	.258	.411	.743
6	Red Sox	.326	September 2025	25	.560	14	11	867	111	230	53	3	20	104	75	6	209	24	3	956	349	76	2	6	3	21	.265	.403	.729
7	Dodgers	.323	September 2025	26	.615	16	10	894	135	233	41	4	47	127	77	9	207	10	2	995	423	92	6	9	7	14	.261	.473	.796
8	Cubs	.322	September 2025	26	.577	15	11	858	120	213	38	4	39	114	92	6	230	26	6	968	376	81	2	10	4	13	.248	.438	.760
9	Braves	.319	September 2025	25	.560	14	11	845	120	211	36	5	36	117	83	7	188	14	6	944	365	77	1	8	0	17	.250	.432	.751
10	Rays	.319	September 2025	26	.385	10	16	874	103	226	38	1	28	101	76	4	231	22	4	964	350	67	4	6	1	24	.259	.400	.719
11	Royals	.318	September 2025	25	.480	12	13	849	122	213	50	3	27	118	76	11	164	12	3	944	350	80	2	6	1	13	.251	.412	.731
12	Athletics	.316	September 2025	24	.542	13	11	824	108	210	46	0	32	102	66	9	214	13	4	906	352	78	4	3	1	10	.255	.427	.743
13	Mets	.314	September 2025	25	.400	10	15	849	116	207	36	1	36	112	80	10	228	29	5	950	353	73	4	7	3	13	.244	.416	.730
14	Blue Jays	.313	September 2025	25	.600	15	10	831	123	208	47	4	29	120	75	5	178	10	5	926	350	80	5	10	3	19	.250	.421	.734
15	Giants	.311	September 2025	25	.520	13	12	825	125	189	34	3	33	121	93	10	207	6	5	939	328	70	0	11	5	14	.229	.398	.709
16	Marlins	.309	September 2025	25	.560	14	11	858	110	210	42	3	23	108	71	13	171	26	8	950	327	68	0	8	1	12	.245	.381	.691
17	Twins	.309	September 2025	26	.308	8	18	880	105	212	42	4	29	97	80	9	246	36	8	978	349	75	3	6	2	18	.241	.397	.705
18	Padres	.308	September 2025	26	.538	14	12	878	121	219	32	2	33	117	69	8	205	16	4	967	354	67	6	6	2	13	.249	.403	.711
19	Guardians	.306	September 2025	28	.714	20	8	927	125	221	51	4	31	122	84	8	242	24	4	1,028	373	86	5	4	4	13	.238	.402	.708
20	Cardinals	.304	September 2025	24	.417	10	14	792	86	185	37	3	16	79	63	19	222	12	6	885	276	56	7	4	3	19	.234	.348	.653
21	Astros	.302	September 2025	25	.480	12	13	862	114	205	41	1	31	108	67	13	221	19	4	946	341	73	1	3	2	14	.238	.396	.697
22	Reds	.301	September 2025	26	.538	14	12	869	110	203	35	3	31	106	83	4	239	13	2	962	337	69	0	6	1	17	.234	.388	.689
23	Tigers	.300	September 2025	25	.320	8	17	843	99	192	34	4	24	91	84	7	252	3	2	944	306	62	2	8	3	12	.228	.363	.663
24	White Sox	.299	September 2025	25	.440	11	14	830	111	190	37	1	29	109	71	14	229	7	1	923	316	67	3	5	0	18	.229	.381	.680
25	Pirates	.295	September 2025	24	.417	10	14	798	83	173	39	3	17	81	80	9	221	12	5	889	269	59	0	2	1	16	.217	.337	.632