Thunder Bay monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Thunder Bay

Thunder Bay average temperature chart (Celsius) Thunder Bay average temperature chart (Fahrenheit)
Average monthly temperatures in Thunder Bay (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -9.5 -6.7 -0.4 7.7 14.7 19.6 23.4 22 16.4 10.1 1.4 -6.4
°F 14.8 19.9 31.2 45.9 58.5 67.4 74.1 71.5 61.6 50.2 34.6 20.5

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Thunder Bay monthly rainfall chart (mm) Thunder Bay monthly rainfall chart (inches)
Average monthly rainfall in Thunder Bay (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 38 27 42 45 70 82 82 88 88 60 49 45
inches 1.5 1 1.6 1.8 2.8 3.2 3.2 3.5 3.4 2.4 1.9 1.8
Rainy days 11 9 10 9 11 13 12 13 13 11 10 11

Average annual rainfall in Thunder Bay: 674.267mm (265.5 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Thunder Bay

Thunder Bay average daily sunshine chart
Average daily sunshine Thunder Bay
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.2 5.3 5.8 8 9 9.4 10.3 9.1 5.8 4.4 3.3 3.4

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Thunder Bay average minimum / maximum temperatures (Celsius) Thunder Bay average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Thunder Bay (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -21 -19 -11.7 -3.2 2.4 7.3 11.1 10.2 5.5 0.5 -6.9 -16.3
Max °C -9.3 -6.5 -0.2 8 15.1 20 23.7 22.3 16.7 10.4 1.7 -6.2
Min °F -5.7 -2.1 11 26.2 36.2 45.1 52 50.3 41.9 32.8 19.7 2.8
Max °F 4.8 9.1 21.4 36.3 47.7 56.5 63.3 61.2 52 41.7 27.3 11.8

Sea temperature

The graph below shows the average sea temperature.

Thunder Bay average sea temperature chart (Celsius) Thunder Bay average sea temperature chart (Fahrenheit)
Average sea temperature around Thunder Bay in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2.5 2.1 2 2.1 2.7 3.7 7.6 14.2 13.1 8.3 5.5 3.7
°F 36.5 35.8 35.6 35.8 36.9 38.7 45.7 57.5 55.5 46.9 41.9 38.7

Wind speed

The graph below shows the average wind speed.

Thunder Bay average winspeed by month (km/h) Thunder Bay average winspeed by month (mph)
Average wind speed in Thunder Bay (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 14 13 14 14 13 12 11 11 12 13 13 13
mph 9 8 9 9 8 7 7 7 7 8 8 8

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Thunder Bay relative humidity averages
Average relative humidity in Thunder Bay
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
70% 69% 69% 65% 66% 72% 74% 77% 79% 76% 76% 73%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Thunder Bay weather stats

Thunder Bay weather statistics
Hottest month: July 23.4°C 74.1°F
Driest month: February 27mm 1.1ins
Sunniest month: July 10.3hrs
Coldest month: January -9.5°C 14.9°F
Wettest month: August 88mm 3.5ins
Warmest sea: August 14.2°C 57.6°F
Map showing location of Thunder Bay (48.4001, -89.31683) Thunder Bay map pin © Google

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