Montreal · Canada

Montreal in September: every year compared

In September, Montreal averages highs of 19.6 °C and lows of 9.8 °C, with 99 mm of precipitation. The warmest September was 1961 (17.0 °C), the coldest 1963 (11.0 °C).

Avg. highAvg. high 19.6 °C

Avg. lowAvg. low 9.8 °C

PrecipitationPrecipitation 99 mm

Rainy daysRainy days 10

Day by day through September

Normal high and low for each day of September in Montreal.

Normal high and low, day by dayNormal 1991–2020

Every September in Montreal, ranked

86 months of September since 1940. The last one, 2025, ranks 22 of 86 (+0.5 °C vs normal).

194019832025

2025 · 15.0 °C · +0.5 °C vs normal · rank 22 of 86

Warmest years

1196117.0 °C
2201516.9 °C
3200216.5 °C
4199916.3 °C
5201716.1 °C

Coldest years

1196311.0 °C
2195611.4 °C
3197811.7 °C
4195011.9 °C
5199512.1 °C

All 86 years in a table

Year	Mean temperature	Daytime highs	Night lows	Precipitation	Hot days (30 °C+)	Frost days	Rainy days
2025	15.0 °C	21.1 °C	9.3 °C	54 mm	0 days	0 days	6 days
2024	16.0 °C	21.6 °C	11.3 °C	52 mm	0 days	0 days	6 days
2023	16.0 °C	21.4 °C	11.4 °C	55 mm	2 days	0 days	7 days
2022	14.1 °C	18.7 °C	9.7 °C	100 mm	0 days	0 days	9 days
2021	15.6 °C	20.1 °C	11.3 °C	86 mm	0 days	0 days	11 days
2020	13.3 °C	18.4 °C	8.6 °C	110 mm	0 days	0 days	9 days
2019	14.1 °C	19.0 °C	9.5 °C	80 mm	0 days	0 days	10 days
2018	15.9 °C	20.7 °C	11.5 °C	78 mm	1 day	0 days	10 days
2017	16.1 °C	21.9 °C	11.5 °C	37 mm	1 day	0 days	4 days
2016	15.6 °C	21.2 °C	10.4 °C	46 mm	0 days	0 days	8 days
2015	16.9 °C	22.6 °C	11.8 °C	110 mm	1 day	0 days	11 days
2014	14.3 °C	19.6 °C	9.3 °C	60 mm	0 days	0 days	8 days
2013	13.7 °C	19.0 °C	8.8 °C	109 mm	0 days	0 days	11 days
2012	14.0 °C	19.4 °C	8.7 °C	161 mm	0 days	1 day	12 days
2011	15.7 °C	20.8 °C	11.4 °C	153 mm	0 days	0 days	12 days
2010	14.8 °C	18.9 °C	10.7 °C	176 mm	2 days	0 days	16 days
2009	13.5 °C	19.0 °C	8.3 °C	80 mm	0 days	0 days	8 days
2008	14.9 °C	19.9 °C	10.1 °C	61 mm	0 days	0 days	9 days
2007	15.1 °C	20.7 °C	9.4 °C	69 mm	1 day	0 days	7 days
2006	13.5 °C	18.0 °C	9.2 °C	80 mm	0 days	0 days	10 days
2005	15.8 °C	21.0 °C	10.9 °C	120 mm	0 days	0 days	13 days
2004	14.5 °C	19.8 °C	9.7 °C	92 mm	0 days	0 days	3 days
2003	15.7 °C	20.8 °C	10.8 °C	93 mm	0 days	0 days	10 days
2002	16.5 °C	22.2 °C	11.1 °C	109 mm	3 days	0 days	10 days
2001	14.9 °C	20.0 °C	10.0 °C	86 mm	1 day	0 days	8 days
2000	12.7 °C	17.6 °C	8.1 °C	113 mm	0 days	2 days	13 days
1999	16.3 °C	21.4 °C	11.9 °C	189 mm	1 day	0 days	12 days
1998	14.5 °C	19.2 °C	10.2 °C	91 mm	0 days	0 days	12 days
1997	13.4 °C	17.6 °C	9.3 °C	111 mm	0 days	0 days	13 days
1996	14.9 °C	19.3 °C	11.2 °C	95 mm	0 days	0 days	12 days
1995	12.1 °C	17.4 °C	6.8 °C	76 mm	0 days	1 day	9 days
1994	13.6 °C	17.9 °C	9.7 °C	75 mm	0 days	0 days	14 days
1993	13.0 °C	17.5 °C	8.6 °C	113 mm	0 days	1 day	9 days
1992	13.6 °C	18.6 °C	8.9 °C	122 mm	0 days	1 day	11 days
1991	12.3 °C	17.5 °C	7.4 °C	84 mm	0 days	1 day	10 days
1990	13.2 °C	17.6 °C	8.8 °C	100 mm	0 days	0 days	11 days
1989	14.4 °C	19.9 °C	9.8 °C	93 mm	0 days	0 days	11 days
1988	13.4 °C	18.6 °C	8.5 °C	78 mm	0 days	1 day	10 days
1987	13.8 °C	18.4 °C	9.7 °C	145 mm	0 days	1 day	14 days
1986	12.3 °C	16.6 °C	8.3 °C	161 mm	0 days	0 days	12 days
1985	14.6 °C	20.3 °C	9.7 °C	144 mm	0 days	0 days	8 days
1984	12.2 °C	17.7 °C	7.3 °C	40 mm	0 days	0 days	10 days
1983	16.0 °C	21.9 °C	10.8 °C	75 mm	3 days	0 days	11 days
1982	13.8 °C	19.1 °C	9.6 °C	107 mm	0 days	0 days	10 days
1981	13.0 °C	17.2 °C	9.5 °C	129 mm	0 days	0 days	13 days
1980	12.5 °C	17.2 °C	7.4 °C	174 mm	0 days	2 days	16 days
1979	13.3 °C	18.3 °C	8.2 °C	130 mm	0 days	0 days	8 days
1978	11.7 °C	17.0 °C	5.8 °C	56 mm	0 days	3 days	9 days
1977	12.9 °C	16.8 °C	9.1 °C	130 mm	0 days	0 days	15 days
1976	12.6 °C	17.4 °C	8.0 °C	144 mm	0 days	0 days	12 days
1975	12.9 °C	17.4 °C	8.5 °C	183 mm	0 days	0 days	16 days
1974	12.6 °C	17.6 °C	8.0 °C	85 mm	0 days	1 day	15 days
1973	13.0 °C	17.6 °C	8.7 °C	140 mm	0 days	1 day	12 days
1972	13.9 °C	18.7 °C	8.4 °C	96 mm	0 days	0 days	13 days
1971	15.6 °C	20.4 °C	10.8 °C	117 mm	0 days	0 days	15 days
1970	13.7 °C	18.2 °C	9.1 °C	94 mm	0 days	0 days	16 days
1969	12.8 °C	17.7 °C	8.0 °C	65 mm	0 days	1 day	12 days
1968	15.1 °C	20.5 °C	10.2 °C	77 mm	0 days	0 days	8 days
1967	13.4 °C	19.3 °C	7.9 °C	82 mm	0 days	0 days	10 days
1966	12.1 °C	17.3 °C	7.5 °C	123 mm	0 days	1 day	9 days
1965	13.7 °C	18.5 °C	8.8 °C	108 mm	0 days	2 days	14 days
1964	12.3 °C	17.5 °C	7.2 °C	47 mm	0 days	2 days	8 days
1963	11.0 °C	16.6 °C	5.6 °C	104 mm	0 days	3 days	6 days
1962	12.4 °C	16.8 °C	8.2 °C	96 mm	0 days	1 day	15 days
1961	17.0 °C	22.5 °C	12.5 °C	56 mm	0 days	0 days	8 days
1960	14.2 °C	19.4 °C	9.7 °C	108 mm	2 days	0 days	9 days
1959	15.6 °C	20.9 °C	11.0 °C	74 mm	0 days	0 days	8 days
1958	13.8 °C	18.4 °C	9.2 °C	116 mm	0 days	0 days	14 days
1957	14.2 °C	19.3 °C	9.2 °C	160 mm	0 days	0 days	14 days
1956	11.4 °C	16.4 °C	6.8 °C	91 mm	0 days	2 days	18 days
1955	13.4 °C	18.6 °C	8.1 °C	86 mm	0 days	0 days	8 days
1954	12.4 °C	16.3 °C	8.9 °C	144 mm	0 days	0 days	18 days
1953	13.9 °C	18.8 °C	9.1 °C	102 mm	1 day	1 day	13 days
1952	14.4 °C	19.2 °C	9.9 °C	57 mm	0 days	0 days	10 days
1951	13.6 °C	18.5 °C	8.9 °C	86 mm	0 days	1 day	11 days
1950	11.9 °C	16.8 °C	7.3 °C	50 mm	0 days	1 day	6 days
1949	13.5 °C	17.7 °C	9.4 °C	88 mm	0 days	0 days	13 days
1948	15.3 °C	21.3 °C	10.1 °C	16 mm	0 days	0 days	5 days
1947	14.4 °C	19.2 °C	9.6 °C	92 mm	0 days	2 days	9 days
1946	15.1 °C	20.5 °C	10.3 °C	96 mm	0 days	0 days	7 days
1945	15.4 °C	19.7 °C	11.5 °C	202 mm	0 days	0 days	14 days
1944	14.4 °C	18.3 °C	10.7 °C	109 mm	0 days	0 days	12 days
1943	13.1 °C	16.9 °C	9.4 °C	55 mm	0 days	0 days	9 days
1942	15.0 °C	19.5 °C	11.2 °C	135 mm	0 days	0 days	9 days
1941	14.5 °C	18.8 °C	9.9 °C	72 mm	0 days	0 days	10 days
1940	13.8 °C	17.5 °C	10.4 °C	94 mm	0 days	0 days	8 days

September records

Hottest day

31.7 °C

September 9, 2002 estimate

Nearby station: 34.0 °C on September 4, 1999 measured

Coldest night

-4.6 °C

September 29, 1980 estimate

Nearby station: -3.4 °C on September 22, 2020 measured

Wettest day

82 mm

September 9, 2004 estimate

The weather on your birthday in Montreal

Any day since 1940: high, low, rain, snow, and how warm it was compared with the same date in every other year.

Questions & answers

How warm is Montreal in September?

Highs average 19.6 °C and lows 9.8 °C. A typical September brings 0 hot days (30 °C or more) and 0 frost days.

Does it rain a lot in Montreal in September?

About 99 mm falls in September, over some 10 days with at least 1 mm. The wettest September was 1945 (202 mm), the driest 1948 (16 mm).

What was the warmest September in Montreal?

1961, with a mean temperature of 17.0 °C. The coldest was 1963 (11.0 °C). The last one, 2025, ranks 22 of 86.