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Peterborough September Weather

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

Typical Peterborough September Weather 1991–2020
Average daily high	21.4 °C
Average daily low	7.2 °C
Average monthly precipitation	7.4 cm
Daily chance of precipitation	38.5%

Peterborough September Weather Records 1866–2024
Highest temperature	37.2 °C	September 15, 1939
Lowest temperature	-7.8 °C	September 21, 1871
Highest daily low	23.9 °C	September 2, 1953
Lowest daily high	5.6 °C	September 30, 1899
Hottest average high temperature	25.5 °C	1921
Coldest average high temperature	17.9 °C	1899
Most daily precipitation	8.1 cm	September 13, 1878
Most monthly precipitation	20.5 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	23.9	9.7	35.6	0.0
September 2	23.7	9.5	34.4	-0.6
September 3	23.7	9.4	33.9	0.7
September 4	23.5	9.3	34.4	-0.6
September 5	23.4	9.1	36.1	0.9
September 6	23.3	9.0	35.6	-0.1
September 7	23.2	8.8	35.6	1.7
September 8	23.0	8.6	33.3	-1.7
September 9	22.8	8.5	34.4	0.0
September 10	22.7	8.2	35.0	-1.1
September 11	22.5	8.0	36.7	-1.7
September 12	22.3	7.8	36.7	-1.7
September 13	22.1	7.7	33.3	0.0
September 14	21.9	7.5	31.7	-2.8
September 15	21.6	7.3	37.2	-3.3
September 16	21.4	7.2	36.7	-2.2
September 17	21.2	7.0	32.2	-3.9
September 18	20.9	6.8	32.2	-6.1
September 19	20.7	6.6	31.1	-3.1
September 20	20.4	6.4	31.1	-4.3
September 21	20.1	6.2	33.9	-7.8
September 22	19.9	6.0	33.3	-5.6
September 23	19.7	5.8	32.2	-4.4
September 24	19.5	5.6	32.9	-3.1
September 25	19.4	5.4	34.4	-3.9
September 26	19.2	5.3	32.2	-2.9
September 27	19.0	5.1	36.1	-3.3
September 28	18.7	4.9	29.4	-3.9
September 29	18.5	4.6	28.9	-3.0
September 30	18.3	4.4	30.0	-6.3

Weather Station Details

Years	Station	Coordinates
2010–2024	Peterborough	location
2005–2010	Peterborough AWOS	location
1971–2004	Peterborough A	location
1866–1970	Peterborough	location