St. Catharines Weather in 2018

Historical record of St. Catharines, Ontario weather for the year 2018 based on NOAA data.

Jump to Month:

Year:

2018 St. Catharines Weather Extremes
Highest temperature	34.0 °C	July 16
Lowest temperature	-17.1 °C	January 7
Highest daily low	25.6 °C	August 28
Lowest daily high	-11.8 °C	January 6
Most daily precipitation	3.6 cm	November 1
Total annual precipitation	72.9 cm	-

What was the hottest temperature in St. Catharines in 2018?

The highest temperature recorded in St. Catharines, Ontario in 2018 was 34.0 °C which happened on July 16.

Highest Temperatures: All-Time By Year

Highest Temperatures in St. Catharines in 2018

Rank	Temperature	Date
1	34.0 °C	Jul 16
2	33.5 °C	Jul 5
3	33.2 °C	Aug 6
4	32.5 °C	Aug 5
5	32.1 °C	Jul 1
6	32.0 °C	Jun 17
7	31.9 °C	Sep 5
8	31.8 °C	Jul 13
8	31.8 °C	Jul 2
10	31.5 °C	Jun 30

What was the coldest temperature in St. Catharines in 2018?

The lowest temperature recorded in St. Catharines, Ontario in 2018 was -17.1 °C which happened on Jan 7.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in St. Catharines in 2018

Rank	Temperature	Date
1	-17.1 °C	January 7
2	-15.6 °C	January 6
3	-14.8 °C	January 5
4	-14.3 °C	January 1
5	-13.5 °C	January 4
6	-11.5 °C	January 14
7	-11.1 °C	January 15
8	-10.9 °C	January 31
9	-10.6 °C	January 13
10	-10.1 °C	January 30

January 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
January 1	-6.8	-14.3	0.05
January 2	-3.8	-9.8	0.00
January 3	-4.2	-7.2	0.07
January 4	-5.0	-13.5	0.00
January 5	-11.3	-14.8	0.00
January 6	-11.8	-15.6	0.02
January 7	0.6	-17.1	0.00
January 8	2.2	-1.0	0.40
January 9	2.0	-2.9	0.00
January 10	8.7	-4.6	0.07
January 11	16.3	7.7	0.62
January 12	13.5	-7.7	1.27
January 13	-7.2	-10.6	0.00
January 14	-4.7	-11.5	0.00
January 15	-4.4	-11.1	0.07
January 16	-1.3	-9.3	0.02
January 17	-3.6	-8.5	0.00
January 18	-1.3	-6.0	0.00
January 19	3.6	-2.0	0.00
January 20	5.4	-0.2	0.00
January 21	3.0	-0.6	0.05
January 22	2.3	0.9	0.96
January 23	8.5	-1.5	0.33
January 24	-1.4	-6.2	0.00
January 25	-0.9	-7.2	0.00
January 26	8.5	-2.9	0.00
January 27	9.5	2.2	0.03
January 28	6.1	0.2	0.00
January 29	0.3	-4.0	0.17
January 30	-3.8	-10.1	0.10
January 31	3.1	-10.9	0.00

February 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
February 1	6.0	-6.2	0.00
February 2	-6.0	-9.6	0.00
February 3	0.9	-8.4	0.00
February 4	2.8	-6.0	0.75
February 5	-4.7	-9.2	0.02
February 6	-2.7	-8.2	0.06
February 7	-2.8	-7.7	0.52
February 8	-4.1	-9.9	0.00
February 9	-3.0	-7.7	0.39
February 10	-1.0	-3.1	0.65
February 11	0.7	-2.8	0.60
February 12	-0.4	-5.0	0.00
February 13	-1.6	-8.7	0.00
February 14	5.7	-1.6	0.00
February 15	8.5	2.7	0.00
February 16	2.8	-3.9	0.00
February 17	-0.1	-4.8	0.00
February 18	4.3	-0.9	0.00
February 19	7.8	-0.5	1.04
February 20	18.4	2.0	0.59
February 21	17.9	0.6	0.66
February 22	1.2	-0.7	0.00
February 23	5.2	0.7	0.47
February 24	4.2	1.4	0.05
February 25	10.9	2.1	0.58
February 26	6.5	0.7	0.00
February 27	11.4	1.2	0.00
February 28	13.4	2.3	0.00

March 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
March 1	3.5	0.0	0.57
March 2	3.3	-0.3	0.36
March 3	3.9	-0.8	0.00
March 4	4.0	-1.1	0.00
March 5	0.3	-3.0	0.00
March 6	1.5	-1.6	0.00
March 7	5.0	-1.1	0.00
March 8	1.6	-2.9	0.00
March 9	3.2	-0.3	0.00
March 10	2.3	-0.9	0.00
March 11	3.5	-1.3	0.00
March 12	0.4	-1.2	0.07
March 13	3.4	-1.4	0.12
March 14	1.8	-2.5	0.04
March 15	5.3	-2.4	0.07
March 16	0.5	-4.2	0.00
March 17	6.5	-3.0	0.00
March 18	8.9	-2.9	0.00
March 19	1.1	-3.2	0.00
March 20	1.3	-3.6	0.00
March 21	1.9	-1.0	0.00
March 22	5.5	-1.2	0.00
March 23	5.3	-0.8	0.00
March 24	1.2	-2.2	0.00
March 25	1.6	-2.7	0.00
March 26	6.0	-0.2	0.00
March 27	6.9	3.7	0.31
March 28	6.2	2.3	0.00
March 29	4.1	2.4	1.99
March 30	6.0	0.4	0.00
March 31	9.5	-0.6	0.29

April 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
April 1	3.9	-0.6	0.00
April 2	6.4	-1.2	0.00
April 3	3.6	1.7	1.27
April 4	7.0	-1.3	0.25
April 5	2.6	-1.8	0.03
April 6	6.7	-0.7	0.19
April 7	2.3	-2.4	0.02
April 8	3.3	-1.4	0.00
April 9	1.9	-2.0	0.00
April 10	6.9	-0.7	0.00
April 11	7.3	0.6	0.00
April 12	14.7	1.5	0.07
April 13	4.5	3.0	0.03
April 14	3.6	-1.5	1.19
April 15	2.3	-1.0	2.19
April 16	3.7	1.0	2.70
April 17	2.0	-0.4	0.02
April 18	4.9	1.6	0.00
April 19	5.7	1.5	0.00
April 20	7.6	0.7	0.00
April 21	n/a	0.0	n/a
April 22	n/a	n/a	n/a
April 23	n/a	n/a	n/a
April 24	n/a	n/a	n/a
April 25	n/a	n/a	n/a
April 26	n/a	3.8	n/a
April 27	n/a	n/a	n/a
April 28	7.2	2.4	0.85
April 29	10.5	1.8	0.02
April 30	17.3	3.8	0.00

May 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
May 1	22.7	7.9	0.00
May 2	22.9	14.5	0.00
May 3	18.8	8.3	0.42
May 4	23.2	7.6	0.79
May 5	21.3	9.6	0.00
May 6	17.8	7.8	0.24
May 7	12.3	7.3	0.02
May 8	11.9	5.1	0.00
May 9	21.9	6.9	0.00
May 10	21.6	6.4	0.23
May 11	11.3	5.6	0.00
May 12	10.7	6.1	0.00
May 13	11.3	6.3	0.00
May 14	n/a	7.7	n/a
May 15	18.3	10.4	2.18
May 16	12.0	8.1	0.00
May 17	19.6	8.8	0.00
May 18	14.1	9.3	0.00
May 19	11.7	9.2	0.93
May 20	19.7	9.3	0.03
May 21	15.2	8.0	0.00
May 22	15.4	9.8	0.99
May 23	24.4	10.4	0.00
May 24	27.1	12.2	0.00
May 25	27.0	14.8	0.00
May 26	25.4	15.0	0.00
May 27	17.8	13.1	0.00
May 28	29.6	13.6	0.00
May 29	21.1	16.0	0.00
May 30	24.5	14.4	0.00
May 31	28.9	n/a	n/a

June 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
June 1	25.3	16.3	0.29
June 2	18.6	14.2	0.00
June 3	19.8	14.4	0.00
June 4	20.5	12.8	0.00
June 5	18.1	11.9	0.25
June 6	16.4	11.6	0.00
June 7	23.9	12.2	0.00
June 8	19.6	13.0	0.00
June 9	18.3	14.1	0.00
June 10	19.5	14.6	0.00
June 11	15.8	10.4	0.00
June 12	20.2	9.8	0.00
June 13	26.6	15.6	0.39
June 14	22.2	14.8	0.00
June 15	23.2	13.4	0.00
June 16	26.5	15.2	0.00
June 17	32.0	17.5	0.00
June 18	30.3	18.0	1.98
June 19	20.3	16.0	0.00
June 20	22.6	15.4	0.00
June 21	20.0	15.5	0.00
June 22	19.0	13.1	0.14
June 23	15.6	12.7	0.52
June 24	17.7	13.1	1.43
June 25	21.8	13.9	0.00
June 26	21.9	13.6	0.00
June 27	23.9	17.0	1.43
June 28	28.6	17.5	0.00
June 29	30.7	19.4	0.00
June 30	31.5	22.5	0.00

July 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
July 1	32.1	22.1	0.00
July 2	31.8	22.2	0.00
July 3	25.7	19.9	0.00
July 4	26.1	20.9	0.00
July 5	33.5	22.1	1.45
July 6	25.2	18.4	0.00
July 7	25.7	18.3	0.00
July 8	28.5	18.6	0.00
July 9	30.5	19.1	0.00
July 10	30.0	21.0	0.00
July 11	26.1	19.8	0.00
July 12	29.0	18.5	0.00
July 13	31.8	22.9	0.00
July 14	27.1	22.4	0.00
July 15	27.6	22.0	0.00
July 16	34.0	22.6	0.00
July 17	29.2	20.4	0.00
July 18	23.2	18.4	0.00
July 19	27.4	16.8	0.00
July 20	31.4	20.2	0.00
July 21	27.2	16.2	0.03
July 22	24.6	14.9	2.20
July 23	25.0	19.7	0.00
July 24	31.0	21.9	0.21
July 25	28.9	21.4	0.02
July 26	29.2	19.3	0.75
July 27	27.1	19.9	0.00
July 28	25.3	18.7	0.00
July 29	26.3	16.5	0.00
July 30	23.9	19.1	0.00
July 31	24.7	20.3	0.00

August 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
August 1	26.7	21.4	0.00
August 2	29.3	21.0	0.00
August 3	26.0	21.1	0.00
August 4	30.6	20.9	0.00
August 5	32.5	20.4	0.00
August 6	33.2	20.7	3.50
August 7	28.4	21.3	0.37
August 8	27.1	21.8	0.73
August 9	29.4	20.5	0.00
August 10	23.6	18.8	0.00
August 11	25.2	16.5	0.00
August 12	25.5	18.9	0.00
August 13	25.8	20.1	0.00
August 14	30.2	22.3	0.00
August 15	30.9	22.3	0.00
August 16	28.3	22.1	0.00
August 17	30.3	21.4	0.72
August 18	22.7	19.4	0.75
August 19	23.9	18.7	0.00
August 20	24.7	19.2	0.00
August 21	27.2	20.4	1.90
August 22	24.7	19.3	0.04
August 23	27.0	17.2	0.00
August 24	27.5	19.8	0.00
August 25	27.6	21.2	0.06
August 26	28.7	22.4	0.00
August 27	29.2	22.3	0.00
August 28	30.8	25.6	0.00
August 29	29.5	21.0	0.00
August 30	21.1	17.4	0.00
August 31	23.7	17.2	0.00

September 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
September 1	30.6	17.6	0.00
September 2	28.6	23.5	0.00
September 3	29.8	20.7	1.96
September 4	25.0	20.7	0.00
September 5	31.9	21.4	0.00
September 6	24.8	21.1	0.11
September 7	23.7	19.5	0.00
September 8	21.2	14.6	0.00
September 9	16.4	13.3	0.00
September 10	18.3	12.8	1.34
September 11	n/a	n/a	n/a
September 12	20.9	16.3	0.00
September 13	21.7	18.9	0.15
September 14	24.7	19.5	0.00
September 15	25.1	20.3	0.00
September 16	24.3	20.0	0.00
September 17	27.4	20.3	0.00
September 18	26.9	18.1	0.00
September 19	20.0	16.5	0.00
September 20	20.2	15.2	0.00
September 21	30.7	16.2	0.00
September 22	16.2	11.7	0.00
September 23	18.3	11.4	0.00
September 24	21.6	13.2	0.50
September 25	22.6	16.4	0.16
September 26	23.5	14.2	0.27
September 27	19.6	11.8	0.00
September 28	23.0	12.4	0.23
September 29	18.6	11.7	0.07
September 30	15.7	11.4	0.38

October 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
October 1	14.4	11.7	0.62
October 2	17.0	12.2	1.12
October 3	22.4	13.0	0.00
October 4	23.6	11.9	0.40
October 5	n/a	n/a	n/a
October 6	21.4	12.2	0.79
October 7	17.2	13.1	0.02
October 8	17.3	12.7	0.00
October 9	27.6	16.0	0.00
October 10	27.7	19.9	0.00
October 11	24.5	11.9	0.00
October 12	12.7	7.6	0.12
October 13	13.2	7.6	0.22
October 14	16.6	7.0	0.00
October 15	14.9	6.7	0.06
October 16	14.1	4.3	0.00
October 17	12.3	6.2	0.03
October 18	10.3	3.4	0.00
October 19	15.5	9.7	0.00
October 20	13.8	6.4	0.22
October 21	7.8	3.8	0.00
October 22	13.4	5.5	0.00
October 23	11.8	6.1	0.16
October 24	7.9	4.9	0.00
October 25	10.1	4.6	0.00
October 26	9.3	5.5	0.00
October 27	7.6	4.0	0.65
October 28	6.9	3.3	0.18
October 29	9.6	5.6	0.21
October 30	10.3	2.7	0.04
October 31	13.5	7.5	0.78

November 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
November 1	8.7	7.0	3.55
November 2	7.6	5.4	0.31
November 3	7.4	4.6	0.25
November 4	7.9	3.7	0.00
November 5	13.8	6.5	0.00
November 6	15.8	8.9	0.37
November 7	10.5	5.4	0.00
November 8	7.1	4.9	0.00
November 9	5.8	2.2	0.33
November 10	3.6	0.0	0.00
November 11	5.6	1.7	0.00
November 12	7.3	3.0	0.00
November 13	5.2	0.1	0.10
November 14	3.3	-1.1	0.00
November 15	1.5	-2.0	0.98
November 16	4.0	0.7	0.37
November 17	4.2	0.8	0.03
November 18	3.5	0.6	0.00
November 19	6.2	0.4	0.00
November 20	3.3	-1.5	0.11
November 21	2.9	-7.6	0.02
November 22	-3.5	-8.1	0.00
November 23	4.8	-6.9	0.00
November 24	7.8	1.2	0.09
November 25	7.9	4.3	0.00
November 26	7.8	3.2	1.45
November 27	3.6	0.3	0.59
November 28	4.0	0.2	0.14
November 29	2.4	0.7	0.00
November 30	2.9	0.5	0.00

December 2018 St. Catharines Weather

Day	High (°C)	Low (°C)	Precip. (cm)
December 1	3.4	2.1	0.30
December 2	14.4	2.9	0.37
December 3	6.9	0.5	0.04
December 4	0.8	-1.9	0.00
December 5	2.2	-3.1	0.00
December 6	4.2	-0.5	0.07
December 7	-0.5	-3.4	0.00
December 8	1.2	-3.7	0.04
December 9	2.6	-3.5	0.00
December 10	2.0	-0.8	0.00
December 11	1.1	-0.7	0.00
December 12	2.1	-1.4	0.03
December 13	4.1	-0.1	0.03
December 14	5.5	2.8	0.25
December 15	3.9	2.5	0.00
December 16	3.7	1.6	0.00
December 17	3.5	1.1	0.00
December 18	1.2	-2.7	0.00
December 19	6.8	-1.5	0.00
December 20	6.0	1.4	0.89
December 21	4.4	1.3	1.43
December 22	1.5	0.0	0.00
December 23	2.7	0.1	0.00
December 24	2.7	0.6	0.00
December 25	1.3	-0.1	0.02
December 26	3.3	-0.9	0.00
December 27	6.8	-3.0	0.13
December 28	12.2	3.8	0.04
December 29	4.0	-2.5	0.02
December 30	1.9	-3.1	0.08
December 31	11.3	-0.7	1.39

Next Year >

Weather Station Details

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