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Hamilton September Weather

Averages and records for weather in Hamilton, Ontario in the month of September.

Typical Hamilton September Weather 1991–2020
Average daily high	22.5 °C
Average daily low	11.2 °C
Average monthly precipitation	6.6 cm
Daily chance of precipitation	33.9%

Hamilton September Weather Records 1866–2024
Highest temperature	37.8 °C	September 2, 1953
Lowest temperature	-3.9 °C	September 26, 1887
Highest daily low	25.6 °C	September 3, 1898
Lowest daily high	7.8 °C	September 28, 1967
Hottest average high temperature	28.1 °C	1881
Coldest average high temperature	17.9 °C	1918
Most daily precipitation	9.4 cm	September 8, 1869
Most monthly precipitation	22.9 cm	1878

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
September 1	25.0	13.7	36.7	2.8
September 2	24.8	13.6	37.8	2.2
September 3	24.8	13.5	37.2	3.3
September 4	24.7	13.3	35.0	4.4
September 5	24.5	13.1	36.7	3.9
September 6	24.4	13.0	37.8	2.2
September 7	24.2	12.9	35.6	4.4
September 8	24.1	12.7	35.6	3.3
September 9	23.9	12.5	34.4	0.0
September 10	23.7	12.2	34.9	-1.7
September 11	23.5	12.0	34.4	0.0
September 12	23.3	11.8	35.0	2.2
September 13	23.1	11.7	36.1	3.3
September 14	22.9	11.5	31.1	1.1
September 15	22.7	11.3	35.6	1.7
September 16	22.4	11.1	35.0	1.1
September 17	22.2	10.9	34.4	-1.7
September 18	21.9	10.7	33.9	-1.1
September 19	21.7	10.5	33.3	0.5
September 20	21.5	10.4	32.2	0.0
September 21	21.2	10.1	31.9	-3.3
September 22	20.9	9.9	31.7	-3.3
September 23	20.8	9.7	32.7	0.0
September 24	20.6	9.5	32.4	-3.3
September 25	20.4	9.3	32.4	-1.1
September 26	20.3	9.1	32.9	-3.9
September 27	20.0	9.0	31.7	-1.1
September 28	19.8	8.7	30.6	0.6
September 29	19.5	8.5	28.9	-0.8
September 30	19.3	8.3	30.6	0.0

Weather Station Details

Years	Station	Coordinates
1997–2024	Hamilton RBG CS	location
1955–1997	Hamilton RBG	location
1866–1954	Hamilton	location