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Cornwall October Weather

Averages and records for weather in Cornwall, Ontario in the month of October.

Typical Cornwall October Weather 1991–2020
Average daily high	14.2 °C
Average daily low	5.7 °C
Average monthly precipitation	9.9 cm
Average monthly snow	0.6 cm
Daily chance of precipitation	41.2%
Daily chance of snow	0.81%

Cornwall October Weather Records 1867–2024
Highest temperature	31.5 °C	October 4, 2023
Lowest temperature	-9.4 °C	October 30, 1868
Highest daily low	20.0 °C	October 2, 2002
Lowest daily high	0.0 °C	October 25, 1877
Hottest average high temperature	18.9 °C	2017
Coldest average high temperature	10.4 °C	1972
Most daily precipitation	7.0 cm	October 31, 2019
Most monthly precipitation	22.1 cm	2005
Most daily snow	14.4 cm	October 22, 1988
Most monthly snow	14.4 cm	1988

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

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
October 1	18.3	8.7	27.8	-3.9
October 2	18.0	8.5	27.8	-3.3
October 3	17.7	8.3	29.5	-1.7
October 4	17.5	8.1	31.5	-5.0
October 5	17.2	7.9	30.0	-4.4
October 6	16.9	7.7	28.0	-4.4
October 7	16.6	7.5	27.2	-4.4
October 8	16.3	7.3	26.0	-3.3
October 9	16.0	7.1	28.0	-3.3
October 10	15.8	6.9	27.2	-6.5
October 11	15.5	6.7	25.6	-7.2
October 12	15.1	6.4	25.6	-7.2
October 13	14.9	6.2	27.0	-6.7
October 14	14.6	6.0	27.0	-6.7
October 15	14.4	5.9	26.1	-6.1
October 16	14.1	5.7	25.6	-5.6
October 17	13.9	5.4	25.6	-6.7
October 18	13.7	5.3	27.5	-6.7
October 19	13.4	5.1	27.0	-5.0
October 20	13.2	4.9	24.5	-6.7
October 21	12.9	4.7	25.0	-6.7
October 22	12.7	4.5	27.0	-5.6
October 23	12.5	4.4	27.0	-6.7
October 24	12.3	4.2	24.4	-5.6
October 25	12.0	4.0	25.6	-6.7
October 26	11.8	3.8	26.5	-8.3
October 27	11.5	3.6	23.0	-8.9
October 28	11.2	3.4	24.0	-7.2
October 29	10.9	3.1	21.0	-5.6
October 30	10.6	2.9	22.0	-9.4
October 31	10.4	2.7	22.5	-6.1

Weather Station Details

Years	Station	Coordinates
1950–2024	Cornwall	location
1867–1887	Cornwall	location