The Chicago Cubs had their most wins in a month in July 1945, in July 1935 and in August 1906, with 26 wins.

	TEAM	W	MONTH	L	W%	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Cubs	26	July 1945	6	.813	32	1,115	183	341	58	11	11	166	128	6	87	14		1,278	454	80	29			16	.306	.380	.407	.787
2	Cubs	26	July 1935	8	.765	34	1,265	236	390	82	10	24	219	98	8	81	25		1,404	564	116	33				.308	.362	.446	.808
3	Cubs	26	August 1906	3	.897	29	883	140	244	29	10	2		92	8		38		1,039	299	41	56				.276	.350	.339	.689
4	Cubs	24	July 1929	8	.750	33	1,171	239	387	78	13	35	226	114	4	106	15		1,322	596	126	33				.330	.392	.509	.901
5	Cubs	23	September 1935	3	.885	26	902	156	271	46	11	10	138	77	8	74	12		1,017	369	67	30				.300	.361	.409	.770
6	Cubs	23	July 1912	8	.742	31	1,054	159	300	60	21	10	143	103	3	137	32		1,207	432	91	47				.285	.350	.410	.760
7	Cubs	23	September 1908	8	.742	33	1,062	139	261	40	7	4		104	7	125	53		1,233	327	51	60				.246	.317	.308	.625
8	Cubs	22	August 2016	6	.786	28	969	143	267	52	8	37	134	100	12	215	8	6	1,099	446	97	7	11	7	15	.276	.347	.460	.807
9	Cubs	22	September 1945	10	.688	32	1,042	135	270	47	8	8	119	100	5	114	20		1,184	357	63	37			12	.259	.327	.343	.670
10	Cubs	22	August 1932	6	.786	28	1,048	149	318	62	8	13	137	72	11	103	12		1,158	435	83	27				.303	.355	.415	.770
11	Cubs	22	July 1922	10	.688	32	1,091	179	342	42	18	11	158	114	3	72	18		1,264	453	71	56				.313	.380	.415	.795
12	Cubs	22	August 1918	12	.647	35	1,124	136	303	38	15	7		83	6	95	45		1,261	392	60	48				.270	.323	.349	.672
13	Cubs	22	August 1912	8	.733	30	1,005	178	301	57	16	13	151	117	13	127	31		1,176	429	86	41				.300	.380	.427	.807
14	Cubs	22	August 1909	8	.733	30	922	125	212	37	11	6		77	6	108	29		1,057	289	54	52				.230	.294	.313	.607
15	Cubs	22	August 1907	8	.733	30	974	98	242	35	10	5		59	7	93	28		1,076	312	50	36				.248	.296	.320	.616
16	Cubs	21	May 1977	7	.750	28	966	168	284	49	7	23	157	107	11	128	16	6	1,111	416	79	16	11	7	22	.294	.367	.431	.798
17	Cubs	21	July 1968	11	.656	32	1,063	127	260	29	8	23	117	96	5	171	7	7	1,187	374	60	14	9	10	25	.245	.308	.352	.660
18	Cubs	21	June 1967	10	.677	31	1,031	164	288	34	13	42	156	95	8	185	16	11	1,163	474	89	16	13	19	23	.279	.341	.460	.801
19	Cubs	21	September 1938	5	.808	28	919	122	232	40	14	13	117	87	4	73	8		1,030	339	67	20				.252	.320	.369	.689
20	Cubs	21	June 1936	5	.808	26	895	141	257	49	7	11	128	103	6	84	16		1,015	353	67	11				.287	.365	.394	.759
21	Cubs	21	August 1910	7	.750	28	909	159	263	52	15	11		105	4	97	34		1,060	378	78	42				.289	.365	.416	.781
22	Cubs	21	July 1910	9	.700	30	967	129	244	30	17	5		106	7	82	39		1,122	323	52	42				.252	.331	.334	.665
23	Cubs	21	September 1906	5	.808	26	866	123	247	30	7	2		60	7		49		971	297	39	38				.285	.337	.343	.680
24	Cubs	21	September 1904	11	.656	32	1,069	121	271	26	12	9		52	7		39		1,132	348	47	34				.254	.293	.326	.618
25	Cubs	21	May 1903	7	.750	28	1,010	176	296	33	20	1	35	91	12	31	58		1,140	372	54	27				.293	.358	.368	.727