Annual Weather Averages Near Thunder Bay
Averages are for Thunder Bay, which is 4 miles from Thunder Bay.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Thunder Bay
High Temp: 77 °F
Low Temp: -2 °F
Mean Temp: 38 °F
Precipitation: 1.96"
Humidity: 74%
Dew Point: 30 °F
Wind: 13 mph
Pressure: 30.01 "Hg
Visibility: 14 mi
January Climate & Weather Averages in Thunder Bay
High Temp: 19 °F
Low Temp: -2 °F
Mean Temp: 8 °F
Precipitation: 0.85"
Humidity: 74%
Dew Point: 2 °F
Wind: 13 mph
Pressure: 30.07 "Hg
Visibility: 13 mi
February Climate & Weather Averages in Thunder Bay
High Temp: 23 °F
Low Temp: -1 °F
Mean Temp: 11 °F
Precipitation: 0.55"
Humidity: 70%
Dew Point: 4 °F
Wind: 13 mph
Pressure: 30.09 "Hg
Visibility: 14 mi
March Climate & Weather Averages in Thunder Bay
High Temp: 34 °F
Low Temp: 12 °F
Mean Temp: 23 °F
Precipitation: 0.85"
Humidity: 70%
Dew Point: 15 °F
Wind: 13 mph
Pressure: 30.09 "Hg
Visibility: 14 mi
April Climate & Weather Averages in Thunder Bay
High Temp: 48 °F
Low Temp: 25 °F
Mean Temp: 36 °F
Precipitation: 1.87"
Humidity: 66%
Dew Point: 25 °F
Wind: 14 mph
Pressure: 30.02 "Hg
Visibility: 15 mi
May Climate & Weather Averages in Thunder Bay
High Temp: 61 °F
Low Temp: 36 °F
Mean Temp: 48 °F
Precipitation: 2.78"
Humidity: 67%
Dew Point: 37 °F
Wind: 14 mph
Pressure: 29.98 "Hg
Visibility: 15 mi
June Climate & Weather Averages in Thunder Bay
High Temp: 71 °F
Low Temp: 46 °F
Mean Temp: 59 °F
Precipitation: 2.93"
Humidity: 74%
Dew Point: 49 °F
Wind: 13 mph
Pressure: 29.92 "Hg
Visibility: 15 mi
July Climate & Weather Averages in Thunder Bay
High Temp: 77 °F
Low Temp: 52 °F
Mean Temp: 64 °F
Precipitation: 3.19"
Humidity: 76%
Dew Point: 56 °F
Wind: 12 mph
Pressure: 29.93 "Hg
Visibility: 15 mi
August Climate & Weather Averages in Thunder Bay
High Temp: 75 °F
Low Temp: 51 °F
Mean Temp: 63 °F
Precipitation: 2.61"
Humidity: 78%
Dew Point: 55 °F
Wind: 11 mph
Pressure: 29.97 "Hg
Visibility: 15 mi
September Climate & Weather Averages in Thunder Bay
High Temp: 66 °F
Low Temp: 43 °F
Mean Temp: 55 °F
Precipitation: 2.45"
Humidity: 81%
Dew Point: 48 °F
Wind: 12 mph
Pressure: 29.98 "Hg
Visibility: 14 mi
October Climate & Weather Averages in Thunder Bay
High Temp: 52 °F
Low Temp: 32 °F
Mean Temp: 42 °F
Precipitation: 2.65"
Humidity: 79%
Dew Point: 35 °F
Wind: 13 mph
Pressure: 29.98 "Hg
Visibility: 14 mi
November Climate & Weather Averages in Thunder Bay
High Temp: 37 °F
Low Temp: 20 °F
Mean Temp: 29 °F
Precipitation: 1.67"
Humidity: 78%
Dew Point: 23 °F
Wind: 13 mph
Pressure: 30.01 "Hg
Visibility: 13 mi
December Climate & Weather Averages in Thunder Bay
High Temp: 25 °F
Low Temp: 6 °F
Mean Temp: 16 °F
Precipitation: 1.08"
Humidity: 79%
Dew Point: 11 °F
Wind: 13 mph
Pressure: 30.04 "Hg
Visibility: 13 mi