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Thunder Bay Weather in 2021

Historical record of Thunder Bay, Ontario weather for the year 2021 based on NOAA data.
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Year:
2021 Thunder Bay Weather Extremes
Highest temperature 34.3 °C July 3
Lowest temperature -36.6 °C February 9
Highest daily low 19.8 °C July 3
Lowest daily high -20.5 °C February 14
Most daily precipitation 4.9 cm November 11
Total annual precipitation 55.3 cm -
What was the hottest temperature in Thunder Bay in 2021?
The highest temperature recorded in Thunder Bay, Ontario in 2021 was 34.3 °C which happened on July 3.
Highest Temperatures: All-Time By Year
Highest Temperatures in Thunder Bay in 2021
Rank Temperature Date
1 34.3 °C Jul 3
2 32.6 °C Jul 18
3 32.1 °C Jul 5
4 31.5 °C Jun 6
5 31.4 °C Jul 2
6 31.3 °C Jul 24
7 31.1 °C Jul 25
8 31.0 °C Jul 17
9 30.8 °C Jul 4
10 30.7 °C Jun 7
What was the coldest temperature in Thunder Bay in 2021?
The lowest temperature recorded in Thunder Bay, Ontario in 2021 was -36.6 °C which happened on Feb 9.
Lowest Temperatures: All-Time By Year
Lowest Temperatures in Thunder Bay in 2021
Rank Temperature Date
1 -36.6 °C February 9
2 -34.7 °C February 10
3 -33.7 °C February 8
4 -33.2 °C February 15
4 -33.2 °C February 11
6 -32.0 °C February 16
7 -31.6 °C February 14
8 -29.8 °C February 17
9 -29.6 °C February 13
10 -27.6 °C February 7
10 -27.6 °C January 27
January 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
January 1
 -3.0 -14.9 0.00
January 2
 -3.1 -9.8 0.00
January 3
 2.4 -15.0 0.00
January 4
 0.4 -13.8 0.03
January 5
 2.3 -6.5 0.00
January 6
 -0.3 -5.9 0.00
January 7
 1.4 -11.8 0.00
January 8
 -1.5 -15.8 0.00
January 9
 -1.6 -11.0 0.00
January 10
 -3.5 -12.3 0.00
January 11
 -0.1 -4.4 0.00
January 12
 1.4 -9.9 0.00
January 13
 0.3 -15.0 0.00
January 14
 2.1 -2.2 0.01
January 15
 2.1 -2.0 0.08
January 16
 -2.0 -9.0 0.00
January 17
 -4.1 -16.9 0.00
January 18
 -7.2 -15.4 0.00
January 19
 -14.9 -22.0 0.00
January 20
 2.2 -24.4 0.11
January 21
 0.7 -17.1 0.00
January 22
 -12.5 -20.8 0.00
January 23
 -4.1 -14.1 0.01
January 24
 -4.5 -16.9 0.26
January 25
 -12.4 -22.7 0.00
January 26
 -13.3 -26.9 0.00
January 27
 -15.4 -27.6 0.00
January 28
 -10.7 -25.0 0.00
January 29
 -9.7 -26.8 0.00
January 30
 -1.5 -17.0 0.01
January 31
 -1.5 -6.5 0.00
February 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
February 1
 -0.9 -7.4 0.00
February 2
 -1.7 -14.8 0.00
February 3
 0.7 -17.7 0.00
February 4
 1.9 -9.4 0.70
February 5
 -9.4 -18.1 0.01
February 6
 -17.3 -23.7 0.00
February 7
 -19.4 -27.6 0.00
February 8
 -19.6 -33.7 0.00
February 9
 -17.8 -36.6 0.00
February 10
 -18.4 -34.7 0.00
February 11
 -17.4 -33.2 0.00
February 12
 -17.4 -27.3 0.05
February 13
 -17.4 -29.6 0.00
February 14
 -20.5 -31.6 0.00
February 15
 -14.9 -33.2 0.00
February 16
 -10.2 -32.0 0.00
February 17
 -7.4 -29.8 0.00
February 18
 -8.0 -19.4 0.02
February 19
 -4.6 -20.9 0.00
February 20
 -3.9 -24.9 0.00
February 21
 -1.3 -18.1 0.02
February 22
 5.4 -4.2 0.00
February 23
 5.0 -1.4 0.02
February 24
 -0.2 -12.2 0.00
February 25
 -2.1 -13.6 0.00
February 26
 4.8 -15.4 0.00
February 27
 2.5 -12.7 0.01
February 28
 -2.0 -12.7 0.20
March 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
March 1
 -9.7 -19.2 0.01
March 2
 6.3 -13.9 0.00
March 3
 -0.1 -11.9 0.00
March 4
 -1.2 -18.3 0.00
March 5
 3.9 -15.4 0.00
March 6
 0.2 -16.5 0.00
March 7
 0.2 -18.2 0.00
March 8
 10.1 -5.3 0.00
March 9
 9.7 -5.7 0.00
March 10
 9.8 -3.9 0.38
March 11
 3.2 -6.5 0.29
March 12
 -2.3 -13.1 0.00
March 13
 9.8 -11.9 0.00
March 14
 1.5 -10.0 0.00
March 15
 1.9 -12.7 0.00
March 16
 8.1 -9.8 0.00
March 17
 9.8 -3.4 0.00
March 18
 4.8 -6.5 0.00
March 19
 14.1 -9.5 0.00
March 20
 12.4 -6.7 0.00
March 21
 14.3 -0.5 0.00
March 22
 10.4 -3.9 0.14
March 23
 8.0 -4.3 0.00
March 24
 5.9 -6.4 1.38
March 25
 -0.2 -9.6 0.00
March 26
 0.7 -6.5 0.00
March 27
 0.5 -7.4 0.38
March 28
 1.2 -9.3 0.00
March 29
 5.8 -9.4 0.01
March 30
 10.1 -6.1 0.00
March 31
 -1.2 -11.9 0.00
April 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
April 1
 3.2 -14.6 0.00
April 2
 8.6 -9.6 0.00
April 3
 17.3 -4.3 0.01
April 4
 10.4 -2.6 0.00
April 5
 9.9 3.5 0.69
April 6
 16.1 0.4 0.00
April 7
 7.9 0.7 1.03
April 8
 8.4 5.4 0.69
April 9
 8.5 5.3 0.15
April 10
 13.0 4.8 0.00
April 11
 11.4 4.8 1.75
April 12
 6.5 4.3 2.38
April 13
 8.1 1.7 0.05
April 14
 6.9 0.1 0.00
April 15
 n/a n/a n/a
April 16
 n/a n/a n/a
April 17
 12.5 -4.7 0.00
April 18
 13.9 -5.6 0.78
April 19
 -0.2 -7.6 0.42
April 20
 -1.3 -12.6 0.00
April 21
 4.4 -5.4 0.00
April 22
 12.4 -8.3 0.00
April 23
 17.1 -3.9 0.06
April 24
 4.1 -6.3 0.08
April 25
 7.0 -9.0 0.00
April 26
 2.5 0.2 0.16
April 27
 6.5 -1.6 0.00
April 28
 14.4 -2.4 0.00
April 29
 15.1 -3.1 0.07
April 30
 n/a n/a n/a
May 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
May 1
 18.7 3.0 0.00
May 2
 12.6 0.5 0.00
May 3
 10.8 1.1 0.95
May 4
 9.6 -1.8 0.20
May 5
 11.3 0.4 0.06
May 6
 11.1 -1.5 0.37
May 7
 8.3 -3.9 0.00
May 8
 10.0 -3.2 0.00
May 9
 9.3 -4.0 0.00
May 10
 9.1 -0.1 0.06
May 11
 16.0 -1.8 0.00
May 12
 17.8 -3.8 0.01
May 13
 22.0 -2.3 0.00
May 14
 22.9 3.7 0.00
May 15
 20.9 1.1 0.00
May 16
 20.1 0.1 0.02
May 17
 23.6 6.4 0.00
May 18
 26.0 3.8 0.00
May 19
 23.2 9.1 0.03
May 20
 16.3 9.9 2.17
May 21
 26.2 12.3 0.41
May 22
 29.4 6.2 1.94
May 23
 11.2 4.3 0.02
May 24
 13.4 8.1 0.00
May 25
 27.0 8.6 0.43
May 26
 18.3 1.9 0.04
May 27
 9.1 -3.4 0.00
May 28
 14.4 -4.6 0.00
May 29
 17.7 -3.6 0.00
May 30
 17.7 0.0 0.03
May 31
 21.4 4.2 0.15
June 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
June 1
 24.1 3.2 0.00
June 2
 24.6 3.8 0.00
June 3
 26.8 8.5 0.07
June 4
 29.3 9.1 0.21
June 5
 23.9 14.1 0.03
June 6
 31.5 12.9 0.51
June 7
 30.7 11.2 0.00
June 8
 26.4 9.4 0.70
June 9
 22.8 10.8 0.15
June 10
 16.5 13.3 3.20
June 11
 14.7 12.4 1.61
June 12
 27.0 12.6 0.01
June 13
 26.1 12.5 0.00
June 14
 24.0 13.1 0.02
June 15
 23.3 8.4 0.00
June 16
 25.3 5.1 0.00
June 17
 30.0 10.9 0.00
June 18
 23.4 10.7 0.00
June 19
 18.6 7.3 0.00
June 20
 20.2 5.7 0.57
June 21
 16.3 4.6 0.00
June 22
 17.1 5.4 0.62
June 23
 25.7 6.2 0.00
June 24
 26.7 11.9 0.02
June 25
 26.9 10.2 0.00
June 26
 24.5 10.1 0.00
June 27
 24.4 13.6 0.07
June 28
 27.1 10.6 0.14
June 29
 22.6 12.8 0.03
June 30
 25.5 11.1 0.00
July 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
July 1
 20.9 9.3 0.00
July 2
 31.4 7.8 0.00
July 3
 34.3 19.8 0.00
July 4
 30.8 15.7 0.00
July 5
 32.1 18.5 0.00
July 6
 20.5 7.0 0.00
July 7
 18.7 3.9 0.00
July 8
 22.3 1.6 0.00
July 9
 27.6 5.5 0.00
July 10
 27.8 7.2 0.00
July 11
 22.5 11.1 0.00
July 12
 24.3 10.1 0.00
July 13
 27.0 8.4 0.27
July 14
 23.5 13.1 0.00
July 15
 26.9 11.6 0.00
July 16
 28.5 8.8 0.00
July 17
 31.0 9.9 0.00
July 18
 32.6 13.6 0.00
July 19
 29.7 13.6 0.00
July 20
 22.3 7.4 0.00
July 21
 23.2 5.0 0.00
July 22
 21.6 14.1 0.00
July 23
 22.3 15.9 0.31
July 24
 31.3 16.0 0.06
July 25
 31.1 12.8 0.00
July 26
 30.4 11.3 0.37
July 27
 26.5 12.0 0.00
July 28
 25.3 10.2 0.00
July 29
 23.7 8.0 0.00
July 30
 22.0 4.5 0.42
July 31
 26.4 11.1 0.16
August 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
August 1
 23.6 9.5 0.00
August 2
 28.1 8.6 0.00
August 3
 27.7 13.0 0.00
August 4
 30.5 13.7 0.00
August 5
 25.1 15.9 0.03
August 6
 n/a n/a n/a
August 7
 18.6 14.7 0.00
August 8
 19.9 15.2 0.04
August 9
 27.5 17.6 0.00
August 10
 n/a n/a n/a
August 11
 26.4 13.8 0.46
August 12
 n/a n/a n/a
August 13
 n/a n/a n/a
August 14
 n/a n/a n/a
August 15
 n/a n/a n/a
August 16
 n/a n/a n/a
August 17
 n/a n/a n/a
August 18
 n/a n/a n/a
August 19
 n/a n/a n/a
August 20
 n/a n/a n/a
August 21
 n/a n/a n/a
August 22
 n/a n/a n/a
August 23
 n/a n/a n/a
August 24
 n/a n/a n/a
August 25
 27.9 9.2 0.00
August 26
 21.0 7.4 0.03
August 27
 17.4 14.9 1.25
August 28
 21.7 15.2 0.05
August 29
 24.0 16.3 2.00
August 30
 25.3 10.0 0.00
August 31
 22.6 5.6 0.00
September 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
September 1
 22.6 5.1 0.00
September 2
 22.2 4.1 0.01
September 3
 23.8 13.0 0.00
September 4
 24.1 13.0 0.28
September 5
 19.9 10.8 0.23
September 6
 19.6 8.7 0.06
September 7
 19.7 14.0 0.65
September 8
 21.3 11.2 0.00
September 9
 22.0 5.9 0.00
September 10
 21.7 6.6 0.00
September 11
 21.8 10.6 0.20
September 12
 19.8 4.3 0.00
September 13
 17.3 3.9 0.00
September 14
 19.1 10.0 0.81
September 15
 22.3 3.8 0.00
September 16
 23.6 11.7 1.63
September 17
 19.9 5.0 n/a
September 18
 19.6 1.9 0.00
September 19
 28.4 12.4 0.00
September 20
 25.9 12.7 2.62
September 21
 17.2 3.8 0.04
September 22
 19.3 1.3 0.00
September 23
 17.3 1.5 0.00
September 24
 15.7 3.3 0.02
September 25
 15.1 2.3 0.00
September 26
 20.4 3.0 0.00
September 27
 17.3 1.3 0.00
September 28
 20.5 3.8 0.00
September 29
 18.8 6.5 0.00
September 30
 20.6 5.9 0.00
October 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
October 1
 24.3 7.5 0.00
October 2
 15.9 13.5 0.57
October 3
 16.0 9.1 0.33
October 4
 21.8 5.9 0.00
October 5
 21.5 3.3 0.00
October 6
 20.3 12.0 0.00
October 7
 17.0 10.5 0.00
October 8
 15.6 13.4 0.18
October 9
 18.5 15.0 0.00
October 10
 17.6 12.4 3.85
October 11
 18.2 9.8 0.00
October 12
 18.5 13.1 0.00
October 13
 16.2 12.3 0.29
October 14
 n/a n/a n/a
October 15
 11.5 7.4 0.00
October 16
 13.7 5.6 0.00
October 17
 16.4 -1.1 0.00
October 18
 19.0 -3.1 0.00
October 19
 25.1 0.1 0.00
October 20
 8.3 -2.7 0.00
October 21
 5.8 -4.2 0.00
October 22
 8.7 -3.3 0.00
October 23
 8.9 -1.3 0.00
October 24
 8.1 -4.1 0.00
October 25
 8.0 -3.6 0.00
October 26
 7.5 -1.9 0.00
October 27
 11.8 5.4 0.01
October 28
 12.2 7.8 0.38
October 29
 11.5 -1.9 0.27
October 30
 11.4 -2.0 0.00
October 31
 6.8 -0.4 0.00
November 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
November 1
 5.5 -3.1 0.00
November 2
 2.5 -3.0 0.00
November 3
 3.5 -4.8 0.00
November 4
 9.5 -8.4 0.00
November 5
 10.5 -6.2 0.00
November 6
 13.1 0.9 0.00
November 7
 12.0 -3.7 0.00
November 8
 13.0 -2.8 0.00
November 9
 12.7 -6.8 0.00
November 10
 6.6 -7.5 0.02
November 11
 7.2 2.4 4.85
November 12
 4.3 -0.2 0.29
November 13
 2.3 -2.2 0.00
November 14
 1.3 -2.7 0.00
November 15
 1.0 -2.7 0.00
November 16
 4.2 -3.2 0.28
November 17
 6.4 -2.1 0.00
November 18
 0.3 -4.1 0.00
November 19
 3.4 -5.6 0.00
November 20
 3.9 -8.1 0.00
November 21
 2.1 -9.7 0.04
November 22
 -3.7 -12.4 0.00
November 23
 3.3 -14.6 0.00
November 24
 5.1 -6.9 0.00
November 25
 -6.6 -15.2 0.00
November 26
 -1.3 -17.3 0.00
November 27
 1.2 -1.8 0.01
November 28
 0.2 -3.7 0.00
November 29
 0.3 -4.4 0.04
November 30
 2.8 -9.0 0.00
December 2021 Thunder Bay Weather
Day High (°C) Low (°C) Precip. (cm)
December 1
 5.6 -9.3 0.09
December 2
 3.6 -9.9 0.00
December 3
 -2.2 -13.9 0.04
December 4
 -1.7 -15.4 0.00
December 5
 -0.6 -15.7 0.65
December 6
 -3.0 -22.9 0.00
December 7
 -13.4 -27.2 0.00
December 8
 -10.9 -25.8 0.00
December 9
 0.1 -13.7 0.42
December 10
 -0.7 -14.7 0.00
December 11
 -0.6 -8.8 0.00
December 12
 4.7 -13.7 0.00
December 13
 2.7 -12.6 0.00
December 14
 3.1 -13.1 0.03
December 15
 5.2 2.0 0.11
December 16
 10.4 -11.6 1.15
December 17
 -9.2 -12.9 0.00
December 18
 -7.6 -12.7 0.02
December 19
 -1.4 -13.1 0.05
December 20
 -2.2 -15.3 0.00
December 21
 -9.1 -18.3 0.43
December 22
 -12.3 -25.0 0.00
December 23
 -2.1 -14.4 0.11
December 24
 3.2 -2.8 0.05
December 25
 -1.6 -14.2 0.00
December 26
 -8.3 -16.7 0.00
December 27
 -3.2 -8.9 0.93
December 28
 -6.0 -14.2 0.05
December 29
 -2.2 -19.1 0.39
December 30
 -10.7 -25.7 0.11
December 31
 -8.7 -23.6 0.00
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Weather Station Details
Years Station Coordinates
2004–2024 Thunder Bay CS location
1941–2003 Thunder Bay A location
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