Thunder Bay Water Temperature

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Thunder Bay is a city close to Lake Superior. August is the month with the warmest water temperature at 61.5°F / 16.4°C. The coolest month is March with an avg. water temperature of 31.8°F / -0.1°C. May is the sunniest at 0.2in / 6.3mm and December the wettest month with 1.7in / 43.9mm. The average air temperature is around 66°F / 18.9°C, July is the hottest month in a year. January is the coolest with 8.2°F / -13.2°C average air temperature. Warm-summer humid continental climate would be the climate here. June, July, August, September would be the best time to visit.

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

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Thunder Bay water temperature by month

°C

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

°F

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

August is the month with the highest water temperature at 61.5°F / 16.4°C. The month with the lowest is March with an average water temperature of 31.8°F / -0.1°C.

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Thunder Bay weather today & 14-day weather forecast

7-day weather forecast
+9-day forecast

7-day weather forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Mar. 25	Scattered clouds	36 °F 15°F	2 °C -10°C	1mph (2km/h) northwest	0in (0mm) 0 %	66%
Mar. 26	Broken clouds	43 °F 18°F	6 °C -8°C	2mph (3km/h) west	0in (0mm) 0 %	71%
Mar. 27	Scattered clouds	34 °F 24°F	1 °C -4°C	2mph (3km/h) west	0in (0mm) 0 %	63%
Mar. 28	Snow	31 °F 24°F	-0 °C -5°C	3mph (5km/h) east	0in (6mm) 95 %	74%
Mar. 29	Heavy snow	30 °F 20°F	-1 °C -7°C	4mph (6km/h) east-northeast	0in (10mm) 100 %	70%
Mar. 30	Snow	31 °F 16°F	-1 °C -9°C	3mph (5km/h) east-southeast	0in (5mm) 95 %	70%
Mar. 31	Broken clouds	26 °F 21°F	-3 °C -6°C	3mph (4km/h) south-southeast	0in (0mm) 0 %	64%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Apr. 01	Overcast clouds	27 °F 20°F	-3 °C -7°C	2mph (3km/h) south	0in (0mm) 0 %	67%
Apr. 02	Overcast clouds	31 °F 23°F	-1 °C -5°C	2mph (4km/h) south	0in (0mm) 0 %	68%
Apr. 03	Overcast clouds	32 °F 27°F	0 °C -3°C	2mph (4km/h) southwest	0in (0mm) 0 %	72%
Apr. 04	Mix snow/rain	37 °F 22°F	3 °C -6°C	2mph (4km/h) south	0in (1mm) 25 %	70%
Apr. 05	Overcast clouds	29 °F 15°F	-2 °C -9°C	2mph (3km/h) southwest	0in (0mm) 0 %	88%
Apr. 06	Light shower rain	37 °F 28°F	3 °C -2°C	1mph (2km/h) east-northeast	0in (2mm) 50 %	99%
Apr. 07	Snow	33 °F 33°F	1 °C 0°C	1mph (2km/h) east-northeast	0in (8mm) 95 %	99%
Apr. 08	Overcast clouds	33 °F 29°F	0 °C -2°C	2mph (4km/h) east-northeast	0in (1mm) 45 %	92%
Apr. 09	Few clouds	28 °F 15°F	-2 °C -10°C	2mph (3km/h) north-northeast	0in (0mm) 0 %	74%

Thunder Bay weather by month / climate table

°C

	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%

°F

	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%

May is the driest at 0.2in / 6.3mm and December the wettest month with 1.7in / 43.9mm. With an average 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 temperature.

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

Lake Superior