The weather in April in Thunder Bay

It's cold in April in Thunder Bay with an average temperature of 7°C. Temperatures this month range from a low of 2°C to a high of 11°C. At night, you can expect temperatures between -9°C and 1°C.

Average temperatures and precipitation

This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in April for Thunder Bay, Canada. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.

Temperature records

With 21°C in 2015, Thunder Bay reached the highest temperature in April over the past 10 years. The lowest daytime temperature in this month was -6°C in 2016. The extreme nighttime temperatures ranged from a lowest recorded value of -16°C to a highest value of 6°C.

Precipitation and snowfall

In April, there is an average of 92 mm of precipitation, spread over 12 days. Of the total precipitation, about 19 cm falls as snow in April. The wind speed is around 4 Bft, mostly coming from the South.

Daily weather in April for Thunder Bay

Click on any day in April to get detailed info about the usual weather on that day in Thunder Bay. Check out the historical temperatures and precipitation over the past 10 years on this day.

1

3° / -7°

2

4° / -5°

3

2° / -7°

4

2° / -9°

5

5° / -7°

6

5° / -3°

7

3° / -4°

8

5° / -3°

9

5° / -5°

10

6° / -3°

11

7° / -2°

12

7° / -2°

13

7° / -2°

14

8° / -3°

15

10° / -3°

16

8° / -3°

17

9° / -2°

18

9° / -1°

19

10° / -2°

20

11° / -2°

21

10° / -1°

22

9° / -2°

23

11° / -3°

24

7° / 0°

25

10° / -1°

26

9° / -2°

27

9° / -3°

28

10° / -2°

29

10° / -1°

30

11° / 1°

Start of April

The month of April starts in Thunder Bay with really cold temps, averaging around 4°C during the day and nights dipping to about -5°C.

Mid April

By mid-April, daytime temps rise to around 9°C, with nights around -2°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.

End of April

By the end of April, the average daytime temperature in Thunder Bay is around 10°C, while nighttime temps are about -1°C. A shower might pop up, but overall, the weather will be dry and sunny.

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UV index

The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

Check out the climate of Thunder Bay for all months and discover the best travel time

Curious about the weather in other parts of Canada? Check out the climate and weather for spots like Vancouver, Toronto, Niagara Falls, or explore other destinations in Canada.

Temperature charts

These charts show the average temperatures in April in Thunder Bay, Canada. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.

Daily Temperature in April in Thunder Bay

Temperature in April in Thunder Bay over the years

Precipitation charts

These charts show the average amount of precipitation in April in Thunder Bay, Canada. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.

Daily Precipitation in April in Thunder Bay

Total precipitation in April in Thunder Bay over the years

Daily Snowfall in April in Thunder Bay

Snowfall in April in Thunder Bay per year

Daily UV index in April in Thunder Bay

This chart shows the average daily UV index in April in Thunder Bay, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

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Average weather in Thunder Bay by month

Click on a month below to see detailed weather info for Thunder Bay. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.