Sion Historic Weather Records
Analyse hottest, coldest, windiest & wettest days

Sion Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-3.95	-8.5		4.0625	-0.5
	-4.5375000000000005	-10.4		3.056250000000001	-4.1
	-5.20625	-11.4		2.7249999999999996	-5.4
	-3.5562499999999995	-14.3		3.4499999999999997	-6.5
	-4.956250000000001	-14.9		2.53125	-7.4
	-5.718750000000001	-14.4		2.18125	-7.4
	-5.331250000000001	-16.3		2.9562499999999994	-8.2
	-3.4187499999999997	-11.4		3.4437499999999996	-2.2
	-3.74375	-7.9		3.0625000000000004	-1.5
	-4.387499999999999	-8.4		2.80625	-6.3
	-5.35	-15.5		2.69375	-4.8
	-5.543749999999998	-8		2.6875000000000004	0.8
	-5.13125	-5.1		2.9000000000000004	2.1
	-5.7437499999999995	-5.7		2.2375	1.7
Jan.	-6	-6.1		2.175	1.4
	-6.356249999999999	-6.6		1.35	1.5
	-6.331250000000001	-4		0.95	1.3
	-8.087499999999999	-5.5		1.0625	1.2
	-6.9	-5.9		1.09375	0.9
	-7.268749999999999	-10.3		0.6312499999999999	0.1
	-7.362500000000001	-12.5		1.24375	-0.8
	-6.143750000000001	-7.3		2.5812500000000003	0.4
	-5.687499999999998	-7.8		2.5	-0.7
	-5.56875	-8.4		2.44375	0.4
	-5.962499999999999	-6.7		2.3187499999999996	-2
	-6.1375	-10.3		2.3125000000000004	-2.9
	-5.187499999999999	-10.7		3.3562499999999993	0
	-4.3187500000000005	-7.2		2.6125	-1.8
	-4.768750000000001	-8.5		3.30625	-2.1
	-4.41875	-11.2		3.86875	-1.6
	-4.08125	-9.2		3.6562499999999996	-0.7
	-4.05	-8		3.5124999999999997	-1.1
	-3.9875	-9.2		4.0375	0.2
	-4.45	-8.9		3.89375	-0.1
	-4.956250000000001	-7.6		4.168750000000001	0
	-3.8499999999999996	-7.3		4.075	1.6
	-4.925	-3.8		4.30625	0.1
	-4.7875	-7.7		3.2312499999999997	0.4
	-5.343750000000001	-7.2		3.9375	0.7
	-4.8	-8.3		4.2375	0.4
	-5.324999999999999	-6.8		3.1937499999999996	0.8
	-5.14375	-4.2		2.6937499999999996	-0.4
	-5.762500000000001	-6.8		2.95625	-1
	-6.012500000000001	-8.6		3.5749999999999997	0
	-6.474999999999999	-7.4		4.112500000000001	-1
Feb.	-3.9437499999999996	-9.3		5.54375	-2.5
	-2.00625	-4.8		6.8187500000000005	-1.3
	-1.88125	-10.4		7.05	-3.2
	-2.5874999999999995	-12		7.3062499999999995	-0.3
	-2.9250000000000007	-7.9		5.8625	-1.6
	-2.78125	-6.5		6.2125	-1.6
	-2.40625	-6.1		6.25	1.4
	-2.212499999999999	-6.1		6.4625	3.7
	-2.4625	-3.9		7.0874999999999995	2.8
	-2.3187499999999996	-1.2		7.1187499999999995	4.3
	-2.6125000000000003	-1.9		6.449999999999999	5.4
	-3.3375	-1.6		5.53125	6
	-3.30625	-1.9		5.374999999999999	6.5
	-2.86875	-1.5		5.76875	4.8
	-2.8	-0.3		6.887499999999999	3.7
	-1.63125	-2.6		7.1125	4.6
	-2.01875	-3		7.912500000000001	5.2
	-1.525	-2.7		6.16875	6
	-3.5624999999999996	-1.6		5.46875	7.2
	-3.275	-0.2		5.56875	7.7
	-3.4999999999999996	-0.8		5.406249999999999	7.8
	-4.643749999999999	-1		6.6812499999999995	7.2
	-2.2187500000000004	-1.3		6.9875	6.8
	-1.9874999999999994	-1.9		7.2562500000000005	6.1
	-2.8812499999999996	-0.7		7.143750000000001	5.7
	-1.8250000000000002	-0.1		7.549999999999999	4.6
	-1.2937500000000002	-4.3		7.70625	6.3
	-1.3250000000000002	-6.3		7.2562500000000005	-0.1
Mar.	-0.8812499999999999	-9.1		7.2875000000000005	0
	-0.93125	-8		9.15	1.7
	0.60625	-5.7		9.2	5.9
	0.6250000000000002	-4.5		8.6125	2
	0.6687500000000001	-4.5		8.875	4.8
	-0.09374999999999996	-3.6		9.149999999999999	5.6
	-0.5249999999999998	-2.7		9.7375	5.5
	0.4375	-3.2		10.4375	4.2
	0.16250000000000003	-4.9		10.9625	2.9
	0.9499999999999997	-3.7		10.000000000000002	5.7
	0.675	-5.1		9.10625	7.1
	0.43125000000000013	-9.9		8.393749999999999	-5.2
	0.08124999999999999	-13.4		9.15	-3.8
	0.14375000000000007	-13.5		9.725000000000001	-0.6
	1.5250000000000001	-9.4		10.7875	-1.7
	1.9625000000000001	-9		10.80625	-0.9
	1.9687499999999991	-8.4		10.1625	-3
	1.09375	-13.2		9.787499999999998	-0.5
	0.94375	-7.9		10.125	1
	1.5937500000000002	-6.5		10.7375	4.2
	2.01875	-2.9		9.374999999999998	8.7
	1.7125000000000004	0.6		10.643749999999999	12.1
	1.7999999999999998	1.5		11.893749999999999	12.2
	1.8624999999999998	2.1		11.762500000000001	13.4
	2.7375000000000003	3.2		12.3875	14.3
	2.30625	3.5		12.499999999999998	13.3
	1.95625	2.9		12.431249999999999	11.6
	3.4749999999999996	2.7		12.725	14.8
	3.2812499999999996	3.6		12.462500000000002	10.6
	3.0375	0.9		12.075000000000003	5.1
	2.95625	0.7		12.831249999999999	3.9
Apr.	4.112500000000001	-0.5		12.85	11.1
	3.9312500000000004	2.6		12.025	10.7
	2.88125	2.3		12.25625	12.3
	3.075	3.1		12.01875	13.8
	2.8062500000000004	3.1		11.6875	11
	2.737499999999999	2		12.756249999999998	9.8
	3.2875000000000005	0.3		13.5	9.1
	3.7437500000000004	-0.2		14.474999999999998	11.2
	4.925	-0.2		13.812499999999998	11.8
	4.41875	1.3		13.606250000000001	13.9
	4.8375	2.9		13.137500000000003	13.5
	3.96875	3.4		12.29375	14.2
	4.637499999999999	4		12.66875	15.1
	3.75625	4.5		12.55	13
	4.4375	5		13.437499999999998	12.4
	4.8999999999999995	3.9		13.456249999999999	13.8
	5.1875	2.9		12.781249999999998	14.3
	4.75	4.7		12.93125	15.6
	5.456250000000001	4.2		12.218750000000002	14.4
	4.7875000000000005	3.1		13.21875	11.5
	4.425000000000001	3.5		14.100000000000001	8.2
	6.28125	0.1		14.3	5.2
	5.41875	-3		14.106249999999998	9.6
	5.824999999999999	-0.1		15.106250000000001	12.3
	6.98125	2.9		15.749999999999998	13.7
	7.15625	4		16.41875	10.4
	7.4437500000000005	1.2		16.8625	6.8
	7.5687500000000005	-3.4		15.868749999999999	2.7
	6.5	-2.5		15.037500000000001	7.6
	6.30625	-1.8		14.525	3.1
May	5.6499999999999995	-3.5		13.46875	0.8
	5.487500000000001	-3.6		13.250000000000002	3.8
	5.518750000000001	-4.3		13.85	8.2
	5.5874999999999995	-0.4		15.843749999999998	7.1
	6.987500000000001	-0.9		15.43125	8.5
	6.675	2.1		15.131250000000001	13
	7.25	2.9		16.46875	17.2
	7.5562499999999995	5.9		16.7	19.4
	8.168750000000001	7.6		17.031249999999996	20.3
	8.137500000000001	8.8		16.212500000000002	21.8
	8.1	9.2		16.95	21.7
	7.8625	10.3		17.71875	22.5
	8.225	10		17.631249999999998	21.7
	8.4875	8.9		17.724999999999998	20.8
	8.862499999999999	8.2		17.293750000000003	21.5
	8.8625	9.3		17.412500000000005	20.7
	8.8625	8.7		16.912499999999998	19.9
	8.65625	8.3		17.068749999999998	17.5
	9.7625	7		18.637500000000003	17
	10.425	4.2		19.40625	13.8
	11.05	3.1		19.8125	16
	10.14375	2.8		18.693750000000005	10.9
	9.906250000000002	4.4		19.0375	16.2
	10.4625	4.6		19.825	17.2
	10.568749999999998	6.9		19.9375	19.7
	11.024999999999997	7.1		18.943749999999998	11.7
	11.243749999999999	1.9		19.79375	7.5
	10.5375	1.4		20.150000000000002	12.5
	11.4375	4.4		20.4	16.8
	11.60625	6		20.093750000000004	20.6
	11.318750000000001	7.1		20.64375	18.9
Jun.	11.224999999999998	6.2		20.037499999999998	18.3
	12.143749999999999	6.9		20.437500000000004	20.7
	12.03125	9.2		22	21.9
	11.906249999999998	10.5		22.112499999999997	24.4
	11.687500000000002	11.7		22.39375	24.1
	12.418750000000001	10.4		21.743749999999995	23.7
	12.450000000000001	11.8		22.125	25.5
	12.33125	12.8		21.65625	25.6
	11.5125	12.9		21.456250000000004	25.5
	11.087499999999999	12.9		21.90625	25.6
	11.650000000000002	12.9		23.056250000000002	25.2
	12.05625	13.1		23.618750000000002	25.3
	13.00625	13.1		22.618750000000002	26.4
	12.88125	13.2		23.64375	24.6
	12.95625	12.5		22.925000000000004	23.7
	13.000000000000002	11.3		23.01875	21.5
	13.312499999999998	8		22.74375	15.5
	13.1	5.9		22.78125	19.1
	13.325	7.8		22.70625	20.5
	13.681249999999999	7.8		22.131249999999998	20.7
	13.2625	7.7		23.55625	21.6
	13.44375	9		23.931250000000002	21.1
	13.6	9.1		23.175	23.4
	12.762500000000001	11.1		21.956249999999997	22.9
	13.15625	10.6		23.250000000000004	24.5
	13.168750000000001	12.3		23.625	24.8
	13.35	10.9		24.1	22.4
	13.65625	10.4		24.143750000000004	24.5
	13.281250000000002	12.8		22.18125	25.9
	12.90625	12.2		22.40625	24.9
Jul.	12.7375	11.5		22.175000000000004	22
	12.668750000000001	11		23	25.6
	12.88125	10.9		22.793750000000003	22.7
	13.362499999999999	10.2		24.31875	19.9
	13.86875	8.9		25.281249999999996	19.5
	14.06875	7.9		24.6125	21
	14.049999999999999	7.6		23.656249999999996	18.3
	13.825000000000001	5.9		23.2	19.6
	13.362499999999995	7.1		23.0125	18.8
	13.156249999999998	6.5		22.599999999999998	22.1
	13.1875	9.6		22.012500000000006	23.4
	12.725	9		21.5125	13.7
	12.893749999999999	6.7		22.88125	20
	13.818749999999998	9.7		22.874999999999996	25.3
	13.26875	13.1		21.8875	25.7
	12.93125	12.5		22.568749999999998	26.6
	13.037500000000001	13.2		24.61875	25.2
	13.706249999999999	11.5		24.125000000000004	22
	14.387500000000001	11.6		24.443749999999998	24.5
	13.90625	12.5		23.837500000000002	26.1
	13.39375	12.2		23.287499999999998	24.7
	13.80625	11.6		23.593750000000004	22.5
	13.1375	11.6		22.618750000000002	20
	12.756250000000001	10.1		23.349999999999994	20.7
	12.84375	9.9		23.1875	23.7
	13.200000000000001	12.4		24.156250000000004	24.9
	13.381250000000003	11.6		23.45625	23.2
	13.6125	12.1		24.125	24.8
	13.599999999999998	12.4		24.4625	25.3
	13.987499999999999		12.5	24.199999999999996		25.3
	13.674999999999999		13.2	23.39375		25.1
Aug.	12.531250000000002		12.1	22.91875		24.4
	12.58125		12.2	22.98125		22.4
	12.956250000000002		8.8	23.424999999999997		17.5
	12.968749999999998		7.5	23.512500000000003		14.5
	13.30625		7	22.187499999999996		20.2
	12.937500000000002		9.7	22.606249999999996		22
	12.856249999999998		12.7	24.150000000000002		23.9
	13.15		13.1	24.63125		24.3
	13.425		12.9	24.062499999999996		24.3
	13.5		13.7	23.78125		23.9
	12.318750000000001		12.3	23.35		22.8
	12.83125		12.5	23.099999999999998		22.7
	12.556249999999999		12	21.4875		22.3
	11.525		12	22.087499999999995		21.7
	12.143750000000002		11.7	22.018750000000004		21
	11.899999999999999		11.3	20.837500000000002		20.4
	11.300000000000002		10.7	20.300000000000004		20.2
	10.35625		10.5	18.818749999999998		19.5
	10.35		10.3	19.531250000000004		20
	10.237499999999999		10.5	21.125		21.3
	11.175		11	21.887500000000003		21.7
	11.587500000000002		10.8	21.337500000000002		20
	10.900000000000002		10.2	20.78125		21
	11.2625		10.9	20.73125		21.3
	10.75		10.5	20.987499999999997		20.8
	10.700000000000001		10.9	20.218750000000004		19.9
	10.78125		10.3	19.66875		19.7
	10.331249999999999		10.2	20.406249999999996		20.1
	10.500000000000002		9.7	20.35		19.3
	9.63125			19.462499999999995
	10.043750000000001			19.325000000000003
Sep.	10.18125			20.125
	10.299999999999999			19.181250000000002
	10.2625			18.28125
	9.4			17.749999999999996
	8.13125			17.537499999999998
	8.456249999999999			18.50625
	7.906250000000001			19.88125
	8.5375			18.718749999999996
	7.9875			18.39375
	7.5375			16.925000000000004
	7.481250000000001			16.81875
	6.95			16.73125
	7.7			16.9375
	7.293749999999999			17.30625
	7.1499999999999995			17.06875
	8.043750000000001			16.687500000000004
	7.0875			17.043750000000003
	7.8			17.33125
	8.325			16.90625
	7.093750000000002			16.618750000000006
	7.0625			15.975000000000001
	6.03125			15.850000000000001
	6.075			15.906249999999998
	7.44375			16.13125
	7.3187500000000005			15.918750000000001
	6.9375			15.962500000000002
	5.9125			15.54375
	6.03125			15.693750000000001
	5.86875			15.11875
	5.268750000000001			14.625
Oct.	5.081250000000001			13.887499999999998
	4.6000000000000005			14.349999999999998
	3.768749999999999			15.025
	5.293750000000001			15.568750000000001
	5.85			15.025
	5.45625			13.881250000000003
	4.6812499999999995			13.89375
	4.0874999999999995			13.181249999999999
	4.4125			14.087499999999999
	4.05			12.993749999999997
	5.0375000000000005			14.21875
	4.650000000000001			14.7625
	3.58125			12.8
	3.812499999999999			12.78125
	4.1375			11.875
	3.6937500000000005			11.875
	3.3875000000000006			13.55
	3.8125000000000004			12.787499999999996
	4.05625			12.062499999999996
	3.55625			11.575000000000001
	3			11.018749999999999
	2.9625000000000004			10.16875
	2.3187500000000005			9.850000000000001
	1.1624999999999999			9.9875
	1.35			9.362499999999999
	1.5312499999999996			9.36875
	1.7375000000000005			9.549999999999999
	1.96875			9.35
	1.775			9.91875
	0.9625000000000001			9.087500000000002
	0.79375			8.906249999999998
Nov.	1.0875000000000001			9.037500000000001
	-0.5874999999999999			9.04375
	-0.4000000000000001			7.993750000000001
	-1.01875			7.35625
	-0.8187499999999999			6.856250000000001
	-1.5187499999999998			6.568749999999999
	-1.88125			6.16875
	-2.48125			5.75625
	-1.9625			6.1125
	-2.58125			6.331250000000001
	-1.3875000000000002			5.8999999999999995
	-2.26875			4.481249999999999
	-3.4187500000000006			4.95
	-2.2			5.331250000000001
	-2.2187499999999996			4.75
	-2.8375000000000004			4.45625
	-2.7624999999999997			4.324999999999999
	-3.8250000000000006			4.51875
	-3.95			3.8000000000000003
	-4.2875000000000005			3.7875
	-3.71875			4.20625
	-3.4312500000000004			3.6562499999999996
	-2.71875			4.40625
	-3.26875			3.8562499999999997
	-4.7			2.575
	-6.19375			2.25
	-4.58125			3.3125
	-6.38125			2.05
	-7.0875			1.8562499999999997
	-5.106249999999999			2.9
Dec.	-4.5375000000000005			3.10625
	-2.83125			4.168749999999999
	-3.6437500000000003			3.65
	-4.575			3.8625000000000007
	-3.9000000000000012			3.9749999999999996
	-3.65625			3.6562499999999996
	-3.6375			3.54375
	-1.70625			4.875
	-1.74375			5.2875
	-2.23125			5.15625
	-3.0125			4.1875
	-3.7687500000000007			3.8125000000000004
	-4.225000000000001			3.64375
	-4.19375			3.18125
	-4.95625			2.7499999999999996
	-5.04375			3.18125
	-3.8066666666666666			4.1466666666666665

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

27°C

Highest Temp

30 Jul. 26

-16°C

Lowest Temp

7 Jan. 26

Seasonal Breakdown

Hottest MonthAugust23.53°C

Coldest MonthJanuary-9.37°C

Wettest MonthFebruary6.87mm

Windiest MonthJuly11.14km/h

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

Weather City Ranking GloballyExplore Real time of the world’s hottest & Coldest Cities based on current temperature data.

Frequently Asked Questions

1. What is the hottest month in Sion historically?

August is historically Sion's hottest month, with average maximum temperatures around 23°C. During peak heatwave events, the highest recorded temperatures have reached 34°C on 2023-08-24.

2. What is the coldest month in Sion historically?

January is Sion's coldest month, with average minimum temperatures around -6°C. The all-time record low of -23°C was recorded on 2012-02-05.

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

Sion's average annual rainfall is approximately 1573.7mm, based on records spanning 17 years.

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

Sion historically records approximately 225.5 rainy days per year. May has the highest number of rain days at an average of 25.5 days.

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

The all-time highest temperature recorded in Sion is 34°C on 2023-08-24.

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

The all-time lowest temperature recorded in Sion is -23°C on 2012-02-05.

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

Sion experiences its strongest winds during December. The historic gust record of 23.3 kph was recorded on 2011-12-16.

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

Usually, Sion's humidity peaks in January at around 86.8% and drops to its lowest in August at approximately 75.7%.

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Sion Historic Weather Records
Analyse hottest, coldest, windiest & wettest days