St. Catharines Weather in 2021

Historical record of St. Catharines, Ontario weather for the year 2021 based on NOAA data.

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2021 St. Catharines Weather Extremes
Highest temperature	33.0 °C	August 9
Lowest temperature	-11.1 °C	February 10
Highest daily low	24.8 °C	August 10
Lowest daily high	-5.6 °C	February 13
Most daily precipitation	4.3 cm	September 7
Total annual precipitation	57.6 cm	-

What was the hottest temperature in St. Catharines in 2021?

The highest temperature recorded in St. Catharines, Ontario in 2021 was 33.0 °C which happened on August 9.

Highest Temperatures: All-Time By Year

Highest Temperatures in St. Catharines in 2021

Rank	Temperature	Date
1	33.0 °C	Aug 9
2	32.5 °C	Aug 23
3	32.2 °C	Jun 29
4	32.0 °C	Aug 24
5	31.5 °C	Aug 11
6	31.4 °C	Aug 26
7	31.1 °C	Aug 29
8	30.8 °C	Jul 26
9	30.7 °C	Aug 12
10	30.5 °C	Aug 6

What was the coldest temperature in St. Catharines in 2021?

The lowest temperature recorded in St. Catharines, Ontario in 2021 was -11.1 °C which happened on Feb 10.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in St. Catharines in 2021

Rank	Temperature	Date
1	-11.1 °C	February 10
2	-11.0 °C	February 8
3	-10.9 °C	February 17
4	-9.7 °C	February 7
5	-9.4 °C	February 13
6	-8.7 °C	January 29
7	-8.5 °C	February 12
8	-8.3 °C	February 21
8	-8.3 °C	February 16
10	-7.6 °C	March 2
10	-7.6 °C	February 14
10	-7.6 °C	January 28

January 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
January 1	1.8	-1.0	0.61
January 2	2.6	0.5	0.67
January 3	2.3	0.1	0.14
January 4	1.9	1.3	0.00
January 5	2.6	1.0	0.00
January 6	2.5	0.7	0.00
January 7	1.6	-1.9	0.00
January 8	0.0	-5.0	0.00
January 9	5.1	-0.5	0.00
January 10	1.6	-1.3	0.00
January 11	1.8	-1.6	0.00
January 12	0.5	-0.8	0.00
January 13	3.4	0.3	0.00
January 14	4.0	1.5	0.00
January 15	6.6	1.5	0.21
January 16	4.0	0.2	0.02
January 17	4.8	0.6	0.09
January 18	1.3	-0.4	0.23
January 19	2.1	-1.6	0.07
January 20	-0.6	-3.7	0.00
January 21	3.9	-0.6	0.00
January 22	2.6	-3.6	0.02
January 23	-1.9	-5.7	0.00
January 24	-1.5	-4.6	0.00
January 25	1.3	-3.6	0.00
January 26	0.6	-2.2	0.34
January 27	1.2	-5.2	0.02
January 28	-4.3	-7.6	0.00
January 29	-3.4	-8.7	0.00
January 30	-0.3	-7.3	0.00
January 31	-2.1	-6.4	0.00

February 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
February 1	-0.8	-3.8	0.02
February 2	0.8	-4.5	0.06
February 3	3.6	-3.6	0.00
February 4	4.1	-5.8	0.08
February 5	3.4	-5.8	0.39
February 6	-3.2	-6.4	0.00
February 7	-3.1	-9.7	0.02
February 8	-4.5	-11.0	0.02
February 9	-1.3	-7.2	0.16
February 10	-3.7	-11.1	0.00
February 11	-1.7	-5.7	0.00
February 12	-4.4	-8.5	0.02
February 13	-5.6	-9.4	0.06
February 14	-2.7	-7.6	0.02
February 15	-2.3	-5.2	0.34
February 16	-2.2	-8.3	0.27
February 17	-2.3	-10.9	0.00
February 18	-2.0	-5.8	0.00
February 19	0.2	-5.3	0.09
February 20	-0.2	-5.3	0.07
February 21	0.4	-8.3	0.00
February 22	3.6	-1.5	0.09
February 23	3.6	0.6	0.02
February 24	11.1	0.3	0.00
February 25	3.0	-0.8	0.00
February 26	4.2	-2.4	0.00
February 27	5.3	-1.0	0.32
February 28	8.6	-0.3	0.17

March 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
March 1	6.8	-6.3	0.00
March 2	1.2	-7.6	0.00
March 3	6.6	0.8	0.00
March 4	1.9	-5.0	0.00
March 5	2.0	-5.3	0.00
March 6	0.5	-4.9	0.00
March 7	0.0	-4.1	0.00
March 8	9.6	-5.1	0.00
March 9	9.1	1.8	0.00
March 10	19.2	-0.6	0.00
March 11	18.4	4.8	0.00
March 12	10.2	-1.7	0.00
March 13	5.6	-3.2	0.00
March 14	5.9	-2.7	0.00
March 15	-1.4	-5.3	0.00
March 16	3.5	-2.3	0.00
March 17	5.7	1.9	0.00
March 18	4.0	0.7	0.00
March 19	3.1	-2.2	0.00
March 20	14.0	-0.6	0.00
March 21	7.7	-0.5	0.00
March 22	14.9	0.1	0.00
March 23	6.6	2.0	0.00
March 24	19.6	4.0	1.07
March 25	18.6	5.1	0.20
March 26	10.9	4.5	1.49
March 27	9.0	3.9	0.00
March 28	8.6	3.6	0.80
March 29	7.5	2.0	0.00
March 30	20.3	3.6	0.00
March 31	17.3	2.7	0.00

April 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
April 1	5.8	-0.1	0.03
April 2	6.4	-1.2	0.00
April 3	8.6	-1.8	0.00
April 4	13.4	2.6	0.00
April 5	8.4	3.5	0.00
April 6	9.5	3.5	0.00
April 7	8.4	4.6	0.00
April 8	9.5	4.7	0.00
April 9	18.6	7.1	0.00
April 10	14.2	6.4	0.00
April 11	16.4	5.9	1.21
April 12	7.5	5.1	0.05
April 13	10.9	5.0	0.02
April 14	15.9	4.3	0.10
April 15	9.0	4.8	0.43
April 16	9.0	5.2	0.08
April 17	11.8	3.8	0.00
April 18	15.0	5.4	0.03
April 19	16.8	6.0	0.32
April 20	7.6	0.6	0.53
April 21	5.8	-0.1	0.72
April 22	6.6	1.0	0.00
April 23	14.7	2.9	0.00
April 24	17.8	7.4	0.00
April 25	10.9	2.8	0.00
April 26	9.3	1.7	0.03
April 27	9.5	6.0	0.06
April 28	11.0	6.2	0.13
April 29	8.6	6.7	0.90
April 30	10.2	5.5	0.02

May 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
May 1	13.1	3.8	0.00
May 2	13.6	8.0	0.00
May 3	9.5	7.4	0.14
May 4	9.3	6.8	0.09
May 5	12.3	6.0	0.00
May 6	14.3	5.2	0.00
May 7	10.5	4.3	0.18
May 8	14.2	4.3	0.00
May 9	9.9	6.4	0.00
May 10	14.4	5.6	0.00
May 11	n/a	n/a	n/a
May 12	16.8	5.4	0.00
May 13	20.4	7.5	0.00
May 14	21.8	8.5	0.00
May 15	20.4	9.9	0.00
May 16	17.4	10.3	0.00
May 17	19.0	9.1	0.00
May 18	26.8	11.8	0.00
May 19	21.0	12.3	0.00
May 20	23.6	12.9	0.00
May 21	29.3	13.6	0.00
May 22	21.8	15.5	0.00
May 23	21.9	15.2	0.00
May 24	15.4	11.8	0.00
May 25	28.9	12.4	0.00
May 26	22.6	12.4	0.10
May 27	15.7	9.9	0.00
May 28	12.6	5.6	1.11
May 29	12.2	8.3	0.00
May 30	15.9	7.3	0.00
May 31	22.4	8.4	0.00

June 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
June 1	24.4	14.4	0.00
June 2	19.6	13.1	0.35
June 3	20.8	13.9	1.33
June 4	24.7	14.0	0.00
June 5	27.9	18.8	0.00
June 6	28.5	19.2	0.00
June 7	28.8	20.6	0.00
June 8	25.4	18.6	0.84
June 9	26.5	18.5	0.00
June 10	19.4	16.0	0.00
June 11	17.0	12.8	0.00
June 12	18.5	12.9	0.00
June 13	23.1	15.7	0.00
June 14	23.9	16.0	0.24
June 15	23.9	15.4	0.00
June 16	22.3	15.1	0.00
June 17	24.7	12.5	0.00
June 18	24.5	18.3	0.30
June 19	28.4	18.0	0.05
June 20	23.3	16.1	0.00
June 21	26.5	14.0	1.08
June 22	21.1	12.4	0.00
June 23	23.4	12.6	0.00
June 24	28.0	18.0	0.00
June 25	27.8	19.1	0.20
June 26	27.2	19.8	0.78
June 27	28.7	23.4	0.00
June 28	29.0	22.8	0.00
June 29	32.2	20.9	0.13
June 30	26.6	19.4	0.02

July 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
July 1	24.0	17.4	0.00
July 2	23.8	16.3	0.00
July 3	25.8	16.5	0.00
July 4	21.8	17.5	0.00
July 5	30.4	18.0	0.00
July 6	29.9	21.7	0.11
July 7	23.2	16.7	0.44
July 8	20.1	16.8	1.21
July 9	20.3	17.5	0.00
July 10	22.8	17.1	0.00
July 11	20.2	18.5	0.19
July 12	20.4	18.6	0.02
July 13	28.5	18.2	0.35
July 14	26.6	20.3	0.00
July 15	29.0	20.7	0.00
July 16	22.9	19.3	0.02
July 17	19.4	16.4	1.21
July 18	27.5	17.9	0.00
July 19	28.9	19.5	0.00
July 20	28.6	19.7	0.78
July 21	n/a	n/a	n/a
July 22	26.2	18.2	0.00
July 23	24.6	18.0	0.00
July 24	26.1	17.8	0.55
July 25	29.6	20.4	0.00
July 26	30.8	19.8	0.00
July 27	25.8	19.9	0.14
July 28	23.6	19.2	0.00
July 29	26.9	19.4	0.97
July 30	23.8	16.7	0.00
July 31	21.8	15.3	0.00

August 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
August 1	23.0	18.1	0.00
August 2	25.3	17.4	0.00
August 3	27.8	16.5	0.00
August 4	25.0	18.0	0.00
August 5	25.8	18.7	0.00
August 6	30.5	19.2	0.00
August 7	27.2	22.5	0.00
August 8	28.2	21.0	0.00
August 9	33.0	23.1	0.00
August 10	28.8	24.8	0.00
August 11	31.5	22.9	0.15
August 12	30.7	23.5	0.00
August 13	29.4	21.7	0.00
August 14	27.2	19.9	0.00
August 15	22.7	18.7	0.00
August 16	23.1	16.0	0.00
August 17	25.7	20.2	0.00
August 18	23.0	20.1	0.65
August 19	29.9	21.2	0.00
August 20	28.9	21.3	0.00
August 21	27.3	22.1	0.00
August 22	28.8	22.0	0.00
August 23	32.5	23.5	0.00
August 24	32.0	21.7	0.00
August 25	30.3	23.6	0.00
August 26	31.4	23.5	0.00
August 27	25.4	21.5	0.00
August 28	25.1	19.8	0.00
August 29	31.1	21.4	0.16
August 30	29.3	21.1	0.06
August 31	27.6	20.7	0.00

September 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
September 1	22.3	18.9	0.00
September 2	24.7	17.3	0.00
September 3	21.8	17.0	0.00
September 4	23.4	16.9	0.12
September 5	28.0	19.0	0.64
September 6	26.1	17.2	0.16
September 7	27.8	15.1	4.26
September 8	26.0	18.3	1.44
September 9	n/a	n/a	n/a
September 10	24.9	16.5	0.00
September 11	25.4	16.1	0.00
September 12	23.6	17.8	1.24
September 13	23.2	16.5	0.20
September 14	28.0	17.6	0.03
September 15	22.4	18.3	0.00
September 16	21.7	16.6	0.00
September 17	23.7	16.1	0.00
September 18	23.1	15.9	0.04
September 19	19.6	15.3	0.00
September 20	23.6	13.4	0.00
September 21	25.8	19.2	0.48
September 22	22.8	16.7	1.93
September 23	19.6	14.0	0.24
September 24	20.9	12.8	0.14
September 25	22.0	12.3	0.09
September 26	21.4	12.5	0.15
September 27	24.0	16.5	0.10
September 28	17.6	14.0	0.00
September 29	21.6	12.8	0.00
September 30	17.1	12.9	0.00

October 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
October 1	20.1	13.3	0.00
October 2	24.6	16.6	0.00
October 3	21.3	17.8	1.21
October 4	18.0	14.1	0.50
October 5	15.7	13.7	0.00
October 6	16.6	13.9	0.00
October 7	18.0	14.5	0.02
October 8	18.5	15.6	0.00
October 9	21.6	16.6	0.02
October 10	23.2	16.8	0.00
October 11	23.1	17.9	0.00
October 12	25.1	16.9	0.21
October 13	22.2	15.9	0.00
October 14	22.8	15.5	0.23
October 15	20.0	16.9	2.10
October 16	17.2	13.2	0.86
October 17	16.9	11.7	0.22
October 18	15.2	10.0	0.11
October 19	20.8	8.5	0.00
October 20	19.7	14.2	0.00
October 21	18.5	12.4	0.95
October 22	12.4	7.8	0.00
October 23	10.9	7.6	0.23
October 24	13.9	6.6	0.24
October 25	12.2	7.4	1.81
October 26	10.3	7.1	0.90
October 27	14.2	7.8	0.00
October 28	11.3	8.3	0.00
October 29	12.3	8.5	2.16
October 30	10.7	7.6	0.24
October 31	15.1	9.8	0.02

November 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
November 1	12.0	7.2	0.00
November 2	10.1	5.5	0.00
November 3	9.8	4.2	0.10
November 4	n/a	n/a	n/a
November 5	11.3	3.1	0.00
November 6	12.8	5.4	0.00
November 7	15.7	5.3	0.00
November 8	18.5	8.5	0.00
November 9	15.8	9.3	0.26
November 10	14.2	6.8	0.00
November 11	16.4	6.5	0.00
November 12	15.6	6.9	0.19
November 13	8.8	3.9	0.29
November 14	6.8	2.3	0.60
November 15	7.3	2.9	0.23
November 16	8.4	3.5	0.00
November 17	17.8	4.0	0.00
November 18	14.6	4.0	0.07
November 19	7.4	2.7	0.00
November 20	7.8	2.3	0.00
November 21	9.7	4.4	0.18
November 22	6.4	1.6	0.00
November 23	6.3	0.6	0.00
November 24	10.0	0.1	0.00
November 25	9.1	5.5	0.48
November 26	5.6	1.0	0.06
November 27	2.3	-0.9	0.00
November 28	1.9	-0.4	0.32
November 29	3.3	0.3	0.00
November 30	4.9	0.1	0.07

December 2021 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
December 1	7.6	2.6	0.00
December 2	10.8	3.1	0.03
December 3	3.7	2.0	0.00
December 4	6.6	2.0	0.00
December 5	5.4	1.5	1.60
December 6	11.4	0.5	0.36
December 7	1.6	-3.4	0.00
December 8	0.0	-4.3	0.25
December 9	1.9	-1.8	0.02
December 10	8.6	1.9	0.02
December 11	18.9	3.5	0.47
December 12	7.5	2.1	0.00
December 13	8.6	4.2	0.00
December 14	5.1	2.0	0.00
December 15	14.3	2.6	0.04
December 16	17.1	6.2	0.00
December 17	6.5	1.8	0.00
December 18	2.8	-1.1	0.52
December 19	0.6	-4.1	0.00
December 20	4.5	-4.4	0.00
December 21	5.5	1.6	0.00
December 22	5.4	-1.5	0.00
December 23	0.3	-3.5	0.06
December 24	5.0	-0.3	0.04
December 25	7.9	4.1	1.00
December 26	4.4	-1.5	0.00
December 27	1.9	-1.4	0.03
December 28	3.4	0.7	0.18
December 29	4.0	1.7	0.00
December 30	3.5	2.0	0.00
December 31	6.5	2.6	0.00

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Weather Station Details

Years	Station	Coordinates
1995–2024	Port Weller (AUT)	location
1882–1994	St Catherines	location