Thunder Bay Historic Weather Records
Analyse hottest, coldest, windiest & wettest days

Thunder Bay Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-16.0125	-21.8		-8.774999999999999	-13.7
	-15.206249999999999	-18.8		-8.9	-10.1
	-15.28125	-16.3		-7.0687500000000005	-10.2
	-15.049999999999999	-16.7		-8.85625	-11.8
	-15.143749999999999	-9		-8.9375	-2.7
	-15.7	-6.2		-9.45625	-1.2
	-14.56875	-8.3		-8.375	-1.4
	-14.06875	-6.2		-7.5125	-1.4
	-14.15625	-6.5		-5.731249999999999	-1.2
	-12.049999999999999	-6.8		-6.762499999999999	-0.5
	-13.712500000000002	-13.8		-6.956249999999999	-5.1
	-15.35	-5.5		-8.15	0.3
	-15.950000000000003	-6.1		-9.15	0.9
	-14.45625	-17.8		-7.59375	-10
Jan.	-14.100000000000001	-18		-5.10625	-8.3
	-14.118750000000002	-9.5		-7.3375	-3.6
	-14.737500000000002	-16.2		-7.656249999999999	-10.3
	-16.412499999999998	-25.4		-8.525	-11.6
	-18.237499999999997	-27.3		-10.85	-17.9
	-19.1625	-26.9		-11.637500000000001	-14.9
	-18.131249999999998	-16.5		-8.968749999999998	-11.3
	-14.337499999999997	-22.1		-8.512499999999998	-14.8
	-14.5625	-29.1		-7.918750000000001	-20.9
	-14.068749999999998	-26.1		-6.381249999999998	-17.5
	-13.99375	-21.4		-7.5062500000000005	-14
	-14.193749999999998	-23.1		-7.4375	-13.8
	-14.34375	-20.4		-7.5125	-12.5
	-17.025000000000002	-19.4		-9.368749999999999	-16.7
	-17.700000000000003	-20.9		-9.512499999999998	-13.9
	-16.656250000000004	-21.9		-8.387500000000001	-11.2
	-15.375	-15.5		-7.937500000000001	-5.8
	-17.19375	-10.9		-9.056250000000002	-4.2
	-16.675	-14.6		-9.512500000000001	-9.2
	-16.7375	-17.4		-9.125	-10.5
	-15.718749999999998	-15.3		-9.1125	-5.6
	-16.31875	-11.4		-8.0125	-0.5
	-15.6	-17.2		-8.8375	-2.2
	-16.637500000000003	-20.7		-10.549999999999999	-12.8
	-17.29375	-14.5		-10.4875	-6
	-17.237499999999997	-8.2		-9.643749999999999	1.3
	-17.806250000000002	-7.5		-10.35	-2.6
	-17.90625	-9.1		-8.287499999999998	-1.6
	-17.325	-13.2		-9.375	-3
	-16.0625	-9.1		-8.299999999999999	-1
	-15.15	-6.1		-7.0874999999999995	-3.5
Feb.	-14.73125	-5.3		-7.125	-2.9
	-15.9875	-4.9		-8.231250000000001	3.8
	-15.65625	-6.9		-7.4750000000000005	-2.8
	-14.6875	-6.4		-5.981249999999999	-4.4
	-14.256250000000001	-7		-7.106250000000001	-5.6
	-13.7625	-7.9		-5.812499999999999	-5.7
	-12.731249999999998	-9.9		-5.1312500000000005	-6.7
	-12.725	-16.2		-5.14375	-7.4
	-11.706249999999999	-22.4		-4.975	-12.4
	-13.243749999999999	-16.7		-5.2562500000000005	-4.2
	-14.493750000000002	-14.7		-7.450000000000001	-7.7
	-14.024999999999999	-19.6		-6.406250000000001	-3.8
	-13.187499999999998	-9.2		-5.0562499999999995	2.8
	-13.781249999999998	-19.3		-6.1312500000000005	-13.4
	-14.537500000000001	-21.9		-6.925	-8.7
	-14.8625	-18.6		-6.1499999999999995	0
	-12.906249999999996	-9.5		-4.781249999999999	-0.5
	-12.468750000000002	-6.8		-4.58125	0.3
	-11.318749999999998	-10.2		-4.800000000000001	-4
	-10.44375	-8.6		-2.8375	0
	-9.512499999999998	-4.1		-2.3187499999999996	4.1
	-8.25625	-1.7		-0.39999999999999997	5.4
	-7.237500000000001	-0.4		-0.5	5.3
	-7.9	-8.4		-1.0812499999999998	-4.7
	-9.1375	-6.3		-1.4375	0.8
	-8.768749999999997	-9.8		-1.775	-2.9
	-6.3812500000000005	-6.2		0.9	-3.6
	-6.05	-13.7		1.5187499999999996	-1.8
Mar.	-6.54375	-8.9		1.2187499999999998	-2.2
	-6.531249999999999	-15.5		0.6749999999999999	-10.4
	-5.4	-18		1.2125000000000001	-8.3
	-5.9125000000000005	-10.3		-0.01249999999999989	1.2
	-6.712500000000001	-2.5		1.3624999999999998	0.4
	-5.26875	-1.4		1.3875000000000002	4.9
	-6.8125	-1.9		0.3999999999999998	1.3
	-7.9875	-5.9		-0.7687499999999998	-0.9
	-6.5562499999999995	-7.8		-0.06249999999999997	3
	-7.218750000000001	-3.4		0.20624999999999996	0.5
	-7.456249999999999	-4.3		-0.9125000000000003	3.5
	-7.581250000000001	-4.9		-0.3437500000000001	1.6
	-6.45625	-9.5		0.0875	-3.7
	-6.481249999999999	-11		0.7750000000000002	-2.6
	-6.031250000000001	-12.9		1.1375	0.5
	-5.043749999999999	-4.1		1.8125	1.6
	-4.30625	-3.9		1.7125	-1.3
	-5.55	-14.1		1.96875	-2.1
	-3.7437499999999995	-5.9		2.6624999999999996	0.8
	-4.15	-5.3		2.3625000000000003	3
	-4.481249999999999	-3.9		1.9000000000000001	-0.1
	-4.40625	-6.8		2.825	5.7
	-3.46875	-11.6		2.6937500000000005	-3.6
	-3.45625	-16.1		2.5500000000000003	3.2
	-3.2687500000000007	-5.2		3.30625	3.1
	-2.2125	-1.3		4.525	3
	-2.31875	-2.7		4.03125	5.9
	-1.6375	-3.3		5.825	10.6
	-1.04375	2.7		6.1312500000000005	5.3
	-1.0875000000000001	2.4		5.424999999999999	9.4
	-2.1125	1.6		4.11875	6.9
Apr.	-1.8937499999999996	3.6		5.206249999999999	10.9
	-2.1375	1.8		4.543750000000001	12.2
	-2.875	2.2		3.5187499999999994	13.3
	-2.25	-4.7		4.825	-0.4
	-1.9	-8.2		5.0687500000000005	0.8
	-1.7999999999999998	-9.8		4.84375	7.6
	-1.59375	-2.1		5.712499999999999	17.3
	-1.38125	-1.5		5.5375000000000005	18
	-1.0125000000000002	3.9		7.281250000000001	12.7
	-0.6812500000000001	3.4		6.2875	10
	-0.43750000000000006	0.6		6.812500000000001	10.5
	-1.125	2.6		5.9312499999999995	7.9
	-1.4437499999999999	2.2		5.8375	12.1
	-0.2625000000000001	4		6.906250000000001	7.1
	-0.09999999999999995	0.1		6.35	5.4
	0.9875	-2.9		8.131250000000001	5.1
	2.3124999999999996	-3.1		8.5625	8.2
	1.78125	-4.3		8.7375	15.7
	1.8250000000000002	1.2		10.3375	19.2
	2.5687499999999996	2.1		10.162500000000001	12.7
	1.8687500000000001	-0.2		9.312500000000004	4.1
	1.3625	-3.5		10.04375	5.3
	2.1125	-2.7		10.356250000000001	7.1
	2.4250000000000003	-4.3		9.149999999999997	15.7
	2.1937499999999996	-0.1		9.612499999999999	11.7
	2.1812500000000004	-1.7		10.799999999999999	8.5
	2.6250000000000004	-3.4		11.712499999999999	12.3
	3.4062499999999996	0.5		12.143750000000002	4.7
	3.6999999999999993	0.5		13.493749999999999	17
	4.3812500000000005	-0.4		13.081249999999999	20
May	4.575	8.1		12.975	27.7
	4.2125	7.5		12.75	18.7
	3.5625	1.2		11.95625	13.4
	3.7687500000000003	6.5		12.562499999999998	11.6
	5.043750000000001	2.2		13.7	6.6
	5.725000000000001	-0.6		14.7625	10.7
	5.7875000000000005	0.8		13.237499999999997	17.6
	5.887500000000001	0.3		14.1375	16.9
	5.643750000000001	7		14.387499999999998	15.2
	6.581250000000001	7.2		15.299999999999997	23.1
	7.168750000000001	4.3		15.449999999999998	23.3
	7.06875	8.1		15.793750000000001	28.1
	6.756250000000001	8		15.200000000000003	23.7
	6.793749999999999	5.5		15.2125	24.8
	7.81875	8.1		16.506249999999998	33.3
	7.63125	9.8		14.912499999999998	19.8
	7.24375	5.4		16.599999999999998	25.9
	6.7749999999999995	5.5		15.343750000000002	23
	6.625	5.6		15.193750000000001	27.5
	7.475000000000001	7.8		16.5625	29.6
	7.9375	11.3		16.6875	20.8
	8.31875	10		15.9125	27.9
	8.225	9.9		17.5125	24.9
	8.53125	8.6		17.1875	18.5
	8.05625	11.4		17.343749999999996	21.4
	8.0375	12.9		16.51875	24.1
	8.825000000000001	11.6		17.150000000000002	19.2
	8.45	11.9		17.343749999999996	30.5
	8.712499999999999	11.5		16.8875	23.5
	8.6875	10.9		17.7625	15.2
	8.506250000000001	8.7		15.73125	22.5
Jun.	8.387500000000001	8.5		16.275	23.7
	9.55	7.2		18.256249999999998	18.8
	10.543750000000003	7.1		19.84375	19.5
	10.687500000000002	7.7		18.9	20.1
	10.162500000000001	7.9		18.237499999999997	22.6
	10.700000000000001	9.4		18.4625	20.1
	10.293750000000001	10.1		17.375	20.4
	10.537500000000001	7		17.775	22.5
	10.6	8.4		19.431250000000002	26.2
	11.931250000000002	10.4		18.9625	21.7
	10.862500000000002	7.6		19.44375	25.2
	10.756249999999998	10.5		19.531250000000004	29.1
	11.53125	9.6		19.818749999999998	26.1
	11.462500000000002	13.5		19.24375	24.6
	11.475	14		19.343750000000004	19
	11.75625	13.3		20.825000000000003	31.3
	12.031249999999998	11.4		20.193749999999998	32
	12.456249999999999	12.6		22.08125	29.9
	13.25	15.3		21.987500000000004	28.9
	13.000000000000002	13.7		21.6125	28
	14.4625	11.4		23.531249999999996	27.9
	13.956249999999999	11.9		21.081249999999997	27.5
	12.887500000000003	14.4		21.06875	31.3
	12.987500000000002	16.3		20.2625	29.3
	12.787500000000001	13.1		20.537499999999998	29.5
	13.100000000000001	12.6		22.537500000000005	30.5
	13.731250000000001	13.2		21.906250000000004	29.8
	13.4875	13.7		20.737499999999997	32.6
	13.868749999999999	17		22.125	41.2
	14.418750000000001	23.5		22.125	36.7
Jul.	13.95625	18.2		21.5375	32.1
	13.687499999999998	15.4		22.05625	29.4
	13.699999999999996	16.3		22.106250000000003	21.4
	14.331249999999999	16		22.424999999999997	27.4
	14.3	12.5		22.6125	27.9
	13.887499999999998	15		21.743749999999995	31.3
	14.1125	13		22.19375	19.6
	14.3125	9.9		22.1625	24.3
	13.95	14.5		22.037499999999998	30.6
	14.550000000000002	15		22.84375	30.7
	14.462500000000002	18.7		23.23125	31.5
	15.018749999999999	14.8		22.75625	28.5
	14.893749999999999	13.6		22.74375	25.4
	14.818749999999998	12.1		22.825	29.3
	15.10625	14		22.993750000000002	33.7
	14.43125	15.9		22.95	30.5
	14.625000000000004	16.2		23.006249999999994	30.9
	14.2125	15.3		22.8375	27.9
	14.762499999999998	10.9		23.54375	27.5
	15.1625	11.5		22.737499999999994	29.8
	14.2375	15.9		21.875000000000004	24.2
	14.393750000000002	9.9		22.024999999999995	27.8
	13.8375	9.9		21.3375	30.4
	13.86875	16.9		21.84375	27.4
	13.756250000000001	12.4		21.712500000000002	26
	14.6125	13.4		22.475	25.8
	14.487499999999999		10.9	22.20625		27.8
	14.39375		12	21.837500000000006		23.5
	14.037499999999998		12.1	22.9875		22.7
	13.89375		10.1	21.69375		19.4
	13.75		8.5	22.099999999999998		21.8
Aug.	14.0875		13.1	22.768749999999997		16.8
	14.831249999999999		13.5	22.143750000000004		22.7
	13.762500000000001		11	21.00625		22.3
	13.75625		13.7	21.599999999999998		21.3
	14.043750000000003		13.9	22.237499999999997		21.7
	14.618749999999999		14.3	20.875000000000004		20.5
	13.118750000000002		12.9	21.325000000000003		21.3
	13.206250000000002		13.3	21.268750000000004		21.4
	14.1625		14.4	21.75		21.5
	14.037500000000001		14.1	20.337500000000002		20.7
	14.14375		14	21.900000000000006		21.2
	13.256250000000001		13.1	21.34375		21.3
	13.425000000000002		13.3	21.056250000000002		20.7
	13.45625		12.9	20.481250000000003		19.7
	13.468749999999998		13.2	20.81875		20.8
	13.568750000000003		13.5	21.781250000000004		21.8
	14.099999999999998		13.6	21.25		20.9
	13.700000000000001		13.2	21.262500000000003		21.2
	13.318750000000003		13.2	21.356250000000003		21.3
	11.893749999999999		12.2	20.2875		20.5
	11.44375		11.8	18.231250000000003		18.5
	11.44375		11.3	18.724999999999994		18.4
	11.087499999999999		11.2	19.025000000000002		19.1
	11.56875		11.2	18.7125		18.3
	10.225		10.4	17.756250000000005		18.1
	10.30625		10.8	17.606250000000003		18.1
	10.88125			17.40625
	11.03125			18.612499999999997
	10.6375			18.3125
	11.031250000000002			18.19375
	10.46875			16.925
Sep.	9.31875			15.968749999999998
	10.20625			18.325000000000003
	10.50625			17.918750000000003
	9.768749999999999			16.043750000000003
	10.3			17.425
	10.806250000000002			17.256249999999998
	9.993749999999999			16.356250000000003
	9.443750000000003			16.1
	9.85625			15.66875
	9.425			16.08125
	9.493749999999999			15.7125
	9.012500000000001			15.8
	9.287500000000001			16.087500000000002
	8.1375			16.46875
	7.7625			14.6
	8.475			14.112499999999999
	7.86875			13.81875
	8.35			14.587500000000002
	8.206249999999999			14.5
	7.43125			14.20625
	7.0375			13.43125
	6.95			12.762500000000001
	6.268750000000001			12.3125
	6.325			12.831249999999999
	6.406250000000001			11.812499999999998
	5.956250000000001			12.543749999999998
	6.125			12.80625
	7.16875			11.906250000000002
	5.324999999999999			10.962499999999999
	4.05			9.7375
Oct.	3.86875			8.93125
	3.18125			8.843749999999998
	2.7625			8.512500000000001
	3.5875			10.012500000000003
	4.781249999999999			10.793750000000001
	3.025			8.19375
	3.1874999999999996			8.73125
	2.9625000000000004			8.75
	3.6874999999999996			8.281250000000002
	2.8875			7.556250000000001
	2.4437499999999996			8.0625
	2.375			7.018749999999999
	1.33125			6.062499999999999
	1.3875000000000002			5.1125
	1.1375			6.075000000000001
	0.75			5.7875000000000005
	0.2187500000000001			4.81875
	-0.13125000000000014			5.575000000000001
	0.44375000000000003			5.581250000000001
	0.55			6.1125
	0.39999999999999997			6.23125
	0.20624999999999993			5.300000000000001
	0.6437499999999999			5.150000000000001
	-0.8312499999999998			4.35
	-0.5187499999999999			4.3374999999999995
	-0.45625000000000004			4.00625
	-2.6			3.41875
	-2.00625			2.10625
	-3.5437499999999997			2.0749999999999997
	-2.95625			1.7875000000000003
	-2.8874999999999993			2.75625
Nov.	-1.7625			2.7562499999999996
	-2.5875000000000004			2.83125
	-2.9562500000000003			1.1187500000000001
	-3.8625			0.6875000000000001
	-5.575000000000001			0.7625
	-5.3625			-0.012499999999999706
	-6.206250000000001			-0.006250000000000172
	-5.531249999999999			0.3999999999999999
	-4.218750000000001			1.71875
	-4.606249999999999			1.8125
	-5.587499999999999			-0.42499999999999993
	-7.074999999999999			-1.63125
	-7.531250000000001			-3.3062500000000004
	-7.168749999999999			-1.25
	-5.543750000000001			-0.28125000000000006
	-5.6125			-0.8374999999999999
	-7.5874999999999995			-1.56875
	-6.5874999999999995			-1.04375
	-7.25			-1.7312500000000002
	-7.0062500000000005			-1.6375
	-8.7125			-2.7624999999999997
	-11.568750000000001			-5.0687500000000005
	-11.068749999999998			-4.450000000000001
	-10.299999999999999			-3.74375
	-10.281249999999998			-3.7750000000000004
	-9.6125			-4.643750000000001
	-10.4625			-5.418750000000001
	-11.6125			-6.1937500000000005
	-11.58125			-5.76875
	-9.7375			-3.9062500000000004
Dec.	-10.237500000000002			-3.2062500000000003
	-10.318750000000001			-3.1624999999999988
	-10.00625			-4.124999999999999
	-12.168750000000001			-5.1625000000000005
	-12.33125			-4.737500000000002
	-11.45			-4.1375
	-9.362499999999999			-4.31875
	-10.2625			-4.76875
	-9.587499999999999			-3.93125
	-9.350000000000001			-3.4625
	-10.718749999999998			-4.956249999999999
	-11.825000000000001			-6.4
	-10.925			-3.906249999999999
	-13.062500000000002			-5.25625
	-12.10625			-5.96875
	-13.01875			-7.293750000000001
	-14.573333333333329			-8.273333333333333

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

41°C

Highest Temp

13 Jul. 26

-29°C

Lowest Temp

23 Jan. 26

Seasonal Breakdown

Hottest MonthJuly29.66°C

Coldest MonthJanuary-16.76°C

Wettest MonthMarch6.12mm

Windiest MonthMarch18.72km/h

Thunder Bay Climate Change InsightsSee how climate patterns are evolving over time. Temperature shifts, rainfall trends, and extreme events—all in one place.

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Frequently Asked Questions

1. What is the hottest month in Thunder Bay historically?

July is historically Thunder Bay's hottest month, with average maximum temperatures around 23°C. During peak heatwave events, the highest recorded temperatures have reached 41°C on 2026-07-13.

2. What is the coldest month in Thunder Bay historically?

January is Thunder Bay's coldest month, with average minimum temperatures around -15°C. The all-time record low of -32°C was recorded on 2019-01-27.

3. What is the average annual rainfall in Thunder Bay over the past 17 years?

Thunder Bay's average annual rainfall is approximately 804.9mm, based on records spanning 17 years.

4. How many rainy days does Thunder Bay experience on average per year?

Thunder Bay historically records approximately 168.1 rainy days per year. September has the highest number of rain days at an average of 15.3 days.

5. What is the all-time highest temperature ever recorded in Thunder Bay?

The all-time highest temperature recorded in Thunder Bay is 41°C on 2026-07-13.

6. What is the all-time lowest temperature ever recorded in Thunder Bay?

The all-time lowest temperature recorded in Thunder Bay is -32°C on 2019-01-27.

7. What is the windiest time of year in Thunder Bay historically?

Thunder Bay experiences its strongest winds during November. The historic gust record of 52.7 kph was recorded on 2022-12-24.

8. What is the highest and lowest humidity in Thunder Bay during a year?

Usually, Thunder Bay's humidity peaks in January at around 87.6% and drops to its lowest in May at approximately 71.2%.

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