Thunder Bay Water Temperature

Thunder Bay is a city close to Lake Superior. August is the month with the highest water temperature at 61.5°F / 16.4°C.
The coldest month is March with an average water temperature of 31.8°F / -0.1°C.
May is the driest at 0.2in / 6.3mm and December the wettest month with 1.7in / 43.9mm.
With an average air temperature of 66°F / 18.9°C, July is the warmest month in a year. January is the coldest with 8.2°F / -13.2°C average air temperature.
The Climate is described as Warm-summer humid continental climate. Best time to Visit would be in June, July, August, September.

Thunder Bay Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: August with 16.4°C / 61.5°F
Coldest Month Water Temperature: March with -0.1°C / 31.8°F
Warmest Month Air Temperature: July with 18.9°C / 66°F
Coldest Month Air Temperature: January with -13.2°C / 8.2°F
Wettest Month: December with 43.9mm / 1.7in
Driest Month: May with 6.3mm / 0.2in
Highest Humidity December with 77.3%
Lowest Humidity May with 70.2%
Best Time to Visit: June, July, August, September
Climate Classification Warm-summer humid continental climate

Thunder Bay water temperature by month

Lake Superior water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

1.8 1 0.5

February

0.4 0.1 -0.1

March

0.2 0 -0.2

April

1.4 0.8 0.4

May

3.2 1.9 1.1

June

7 4.6 3

July

15.2 10.8 6.9

August

16.9 16 14.8

September

16.7 14.8 12.6

October

12.8 10.3 7.9

November

7.8 6.3 5

December

4.9 3.8 2.9

Lake Superior water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

35.2 33.8 32.9

February

32.7 32.2 31.8

March

32.4 32 31.6

April

34.5 33.4 32.7

May

37.8 35.4 34

June

44.6 40.3 37.4

July

59.4 51.4 44.4

August

62.4 60.8 58.6

September

62.1 58.6 54.7

October

55 50.5 46.2

November

46 43.3 41

December

40.8 38.8 37.2
The warmest water temperature are in August with around 61.5°F / 16.4°C. The coldest in March with an average water temperature of 31.8°F / -0.1°C.

Thunder Bay weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Sep. 23
Scattered clouds
60 °F
47°F
16 °C
9°C
1mph (2km/h)
south
0in (0mm)
20 %
88%
Sep. 24
Overcast clouds
63 °F
49°F
17 °C
9°C
2mph (3km/h)
west-southwest
0in (1mm)
40 %
85%
Sep. 25
Moderate rain
59 °F
43°F
15 °C
6°C
4mph (6km/h)
north-northwest
1in (14mm)
95 %
78%
Sep. 26
Overcast clouds
52 °F
42°F
11 °C
6°C
1mph (1km/h)
southwest
0in (3mm)
75 %
89%
Sep. 27
Overcast clouds
64 °F
44°F
18 °C
7°C
1mph (1km/h)
southeast
0in (0mm)
0 %
87%
Sep. 28
Few clouds
67 °F
48°F
19 °C
9°C
1mph (1km/h)
south
0in (0mm)
0 %
83%
Sep. 29
Clear Sky
71 °F
52°F
22 °C
11°C
2mph (2km/h)
east
0in (0mm)
0 %
87%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Sep. 30
Broken clouds
70 °F
56°F
21 °C
14°C
1mph (2km/h)
east
0in (0mm)
0 %
82%
Oct. 01
Overcast clouds
72 °F
57°F
22 °C
14°C
2mph (3km/h)
east
0in (0mm)
0 %
84%
Oct. 02
Broken clouds
60 °F
54°F
15 °C
12°C
3mph (4km/h)
southeast
0in (0mm)
20 %
77%
Oct. 03
Few clouds
65 °F
52°F
19 °C
11°C
2mph (3km/h)
west-southwest
0in (0mm)
0 %
61%
Oct. 04
Broken clouds
63 °F
51°F
17 °C
10°C
2mph (3km/h)
west-southwest
0in (2mm)
70 %
80%
Oct. 05
Overcast clouds
65 °F
41°F
19 °C
5°C
2mph (3km/h)
west
0in (2mm)
60 %
70%
Oct. 06
Broken clouds
70 °F
41°F
21 °C
5°C
2mph (3km/h)
east-southeast
0in (0mm)
0 %
68%
Oct. 07
Overcast clouds
63 °F
51°F
17 °C
10°C
3mph (4km/h)
west-southwest
0in (1mm)
60 %
51%
Oct. 08
Broken clouds
66 °F
49°F
19 °C
10°C
1mph (2km/h)
east-southeast
0in (0mm)
0 %
59%

Thunder Bay weather by month / climate table

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

-6.3 -13.2 -20.1 29 0 75.3%

February

-5.9 -12.2 -18 14.8 0 73.8%

March

2.5 -5.6 -14.9 6.9 0 73.8%

April

8.4 1 -6 7.9 0 71.1%

May

17.5 8 1.1 6.3 1 70.2%

June

21.3 13.9 6.7 16.5 1 74.6%

July

24.1 18.9 13.2 28 1 72.6%

August

23.7 18.8 14.6 26.8 0 73%

September

22 14.9 7.1 23.3 1 74.2%

October

14.3 7.3 1.7 24.9 0 74.9%

November

6.6 0.4 -6.8 26.4 0 74.8%

December

-2.3 -8.1 -13.4 43.9 0 77.3%

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

20.7 8.2 -4.2 1.1 0 75.3%

February

21.4 10 -0.4 0.6 0 73.8%

March

36.5 21.9 5.2 0.3 0 73.8%

April

47.1 33.8 21.2 0.3 0 71.1%

May

63.5 46.4 34 0.2 1 70.2%

June

70.3 57 44.1 0.6 1 74.6%

July

75.4 66 55.8 1.1 1 72.6%

August

74.7 65.8 58.3 1.1 0 73%

September

71.6 58.8 44.8 0.9 1 74.2%

October

57.7 45.1 35.1 1 0 74.9%

November

43.9 32.7 19.8 1 0 74.8%

December

27.9 17.4 7.9 1.7 0 77.3%
The hottest avg. temperature is around 66°F / 18.9°C, July is the month with the highest temperature. January is the coolest with 8.2°F / -13.2°C average temperature. May is the month with the lowest precipitation of 0.2in / 6.3mm and December with the maximum precipitation in a year with 1.7in / 43.9mm.

Activities & POI in Thunder Bay

Type of Activity List
Beach Attwood Beach, Carnelian Beach, Thomsonite Beach, Greenstone Beach, Little Greenstone Beach, Sand Trap
Attraction Kakabeka Falls, Time Zone, The First Railroad Spike, David Thompson Astronomical Obervatory, Fort William Historical Park
Caravan Site Thunder Bay KOA Holiday, Happy Land Park, Scott and Rohnda's Resort & Campgrounds