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

Hermiston Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-2.931249999999999	-1.5		2.3249999999999997	1.6
	-3.3812499999999996	0.5		2.21875	5.4
	-2.3062500000000004	0.3		3.175	4.8
	-1.7562500000000005	3.7		4.7125	8.9
	-0.66875	1.7		4.918749999999999	9.2
	-0.7125	0		5.706249999999999	7.4
	-0.23750000000000007	3.7		5.84375	8.2
	-0.7500000000000002	0.1		4.7625	4.9
	-0.7749999999999999	2.1		5.268749999999999	8.9
	-1.0937500000000002	-0.8		5.1875	3.2
	-1.7187500000000004	-1.5		4.44375	7
	-1.2	1.7		5.2625	12.2
	-1.8562500000000004	0.6		4.612500000000001	8.4
	-2.19375	2.4		4.7562500000000005	3.9
Jan.	-2.4749999999999996	0.5		4.075	1.9
	-2.0437499999999997	1.9		4.25	3.1
	-1.65	0.6		4.9375	4.5
	-0.2875000000000001	0.4		6.3062499999999995	1.8
	-0.66875	-1.1		5.1000000000000005	2.2
	-1.475	-2.2		4.843750000000001	2.9
	-1.3437499999999998	-0.7		5.04375	1.3
	-1.4375	-1		5.4375	0.3
	-1.08125	-1.7		5.762499999999999	1.4
	-0.04375	-3.2		7.481249999999999	1.4
	-0.34375000000000006	-2.8		7.137499999999999	2.2
	-0.4125	-2		6.575	3.1
	-0.06250000000000006	-1.4		7.168749999999999	2.1
	1.1102230246251565e-16	0.1		7.256249999999999	6.4
	0.35625	2.1		7.3999999999999995	10.7
	-0.12499999999999983	3.5		6.731249999999999	9.5
	0.7	2.3		7.3687499999999995	6.3
	-0.16874999999999987	3.4		7.26875	5.9
	-0.9874999999999998	2.6		6.550000000000001	10.8
	-0.6499999999999999	0.6		6.1125	4.6
	-0.15000000000000008	3.7		7.075000000000001	6.9
	0.9312499999999999	3.5		8.168750000000001	4.3
	1.1375000000000002	2.8		7.837500000000001	4.2
	0.3562499999999999	3.4		7.706250000000001	7.6
	-0.006249999999999978	7.5		7.074999999999999	9.8
	-0.8875	3.6		6.862500000000001	12.1
	-1.6749999999999998	-2.2		7.85625	2.2
	-0.625	0.6		7.887499999999999	5.8
	-0.6250000000000002	-0.3		8.549999999999999	7.5
	-0.54375	0.5		7.699999999999999	7.6
	0.08749999999999974	3.8		7.637499999999999	7.3
Feb.	-0.10000000000000003	4.5		7.50625	8.8
	0.8187499999999999	1.8		8.35	6.5
	0.85625	-0.9		8.712499999999999	7
	-0.03125000000000007	0.2		7.625000000000001	7.2
	-0.15625000000000006	-1.5		7.468749999999999	6.2
	0.018749999999999933	-2.4		8.325000000000001	8.6
	-0.1750000000000001	-0.9		7.9875	9.1
	-0.6125000000000002	1.7		7.9	10
	-1.14375	3.7		7.156249999999999	12.3
	-0.9187500000000002	4.3		7.543750000000001	6.4
	-0.6499999999999998	1.8		7.487500000000002	10
	-1.1875000000000002	0		7.643750000000001	13.9
	0.08125000000000007	0.2		8.937500000000002	12.5
	0.9625	0.3		9.81875	9.4
	1.175	2.1		10.34375	11.9
	1.96875	2		10.275	14.8
	0.9437500000000001	3.4		10.175	14.1
	0.8187500000000001	6.4		10.91875	11.5
	1.1125	2.6		11.506250000000001	8.9
	1.40625	4.4		11.137500000000001	11.7
	1.1062500000000002	8		11.193750000000001	16.2
	0.9187500000000001	5.7		10.893749999999999	15
	1.025	0.1		11.731250000000001	8.6
	1.5312499999999998	0.9		11.468749999999998	11
	2.4937500000000004	4.7		12.393749999999999	13.7
	3.0562500000000004	8.5		13.7375	13.7
	3.40625	2.8		13.425000000000002	5
	3.23125	2.7		13.44375	9.1
Mar.	3.6375	-1		12.443750000000001	9
	2.7937499999999997	6.9		12.393749999999999	17.8
	1.58125	12.1		11.775	18
	2.31875	6.4		13.675000000000002	21
	2.1625	9.8		13.66875	20.8
	3.15625	11.6		14.48125	22.5
	4.24375	6.4		13.500000000000002	15.3
	3.6062499999999997	0.4		13.350000000000001	11.8
	3.4625000000000004	3.4		13.725000000000001	15.2
	4.4875	9		13.71875	14.3
	4.1187499999999995	4.2		13.8	12.2
	4.718749999999999	-0.6		14.1875	11.3
	4.949999999999999	-0.8		15.124999999999998	14.4
	5.79375	5.6		14.525000000000002	17.5
	5.0249999999999995	4.7		14.987499999999997	9.5
	4.8625	0.4		15.475000000000001	10.1
	4.475	0.5		15.262499999999998	11.3
	4.518750000000001	2.9		15.6875	18.1
	4.65	3.4		14.506250000000001	15.3
	4.2875000000000005	3.5		15.6125	19.9
	4.725	2.8		15.175	24.1
	4.3687499999999995	4.9		13.918750000000001	26.4
	4.71875	5.8		15.43125	24.9
	5.481249999999999	11.9		16.674999999999997	24.7
	4.9875	3.6		15.44375	20.1
	5.06875	3.3		16.349999999999998	24.4
	6.012499999999999	4.5		17.262500000000003	23.7
	5.781250000000001	9.3		16.125	23.6
	5.0874999999999995	7.9		15.662500000000001	20.2
	4.9375	9.5		14.793750000000001	19.4
	3.7437499999999995	7		15.93125	18.1
Apr.	5.293750000000001	4.7		16.73125	15.4
	5.624999999999999	2.8		16.7875	14.3
	5.16875	3.4		16.618750000000002	17.8
	5.612500000000001	1.6		18.48125	24.8
	6.456250000000001	3.9		18.831249999999997	28
	6.1000000000000005	5.7		18.56875	28
	6.931250000000001	9.5		19.09375	26.8
	6.9625	7.8		18.75625	13.8
	7.031249999999999	6.7		19.174999999999997	20.6
	6.981250000000001	5.4		19.05625	18.6
	7.6187499999999995	0.4		19.29375	18.1
	7.9750000000000005	1.1		20.125	20.4
	7.83125	4.9		19.11875	23.2
	7.55	7.5		18.506249999999998	22.8
	7.46875	7.4		19.706250000000004	24.9
	7.9625	5		19.299999999999997	27.2
	7.19375	6.2		20.04375	29.3
	8.237499999999999	9.5		20.881250000000005	31.5
	8.968749999999998	8.9		21.83125	31.9
	9.187500000000002	9.7		22.39375	31.8
	9.13125	13.7		20.581250000000004	30.8
	8.96875	13.7		20.812499999999996	30.4
	8.762500000000001	12.8		20.81875	28.3
	8.350000000000001	12.8		21.937499999999996	27
	9.049999999999999	9.9		22.3375	28.2
	9.5	7.6		23.112500000000004	29
	10.306249999999999	9.2		23.681250000000002	27.6
	10.243749999999999	7.5		23.6875	32
	10.46875	12.1		23.943749999999998	19.9
	10.925	9.9		24.66875	23.9
May	11.256250000000001	8.7		24.799999999999994	21.7
	12.19375	8.5		23.537499999999998	19
	11.88125	7.7		23.6875	22.9
	10.818750000000001	7.5		21.61875	24.4
	10.499999999999998	9.1		22.91875	26.7
	10.4125	10.7		22.5625	23.2
	10.00625	10.4		21.943749999999998	28.3
	10.899999999999999	8.2		21.462499999999995	30.2
	10.749999999999998	11.1		22.568749999999998	31.8
	10.618749999999999	13.1		22.24375	31.5
	10.9125	12.8		23.287499999999998	31.4
	11.418750000000001	10.5		23.0375	21
	11.075000000000001	11.4		23.325	29.4
	12.049999999999999	14.3		24.3375	34.5
	12.200000000000001	14.2		24.6125	25.8
	12.025	9.4		25.187500000000004	24.8
	12.6125	9.2		25.825	25.1
	12.737499999999999	9.8		25.918749999999996	29.5
	13.787500000000001	10.2		27.337499999999995	30
	14.243749999999999	12.8		26.3125	29.7
	13.231250000000001	12.4		25.956249999999997	27.9
	13.3	11		26.812500000000007	25.7
	14.099999999999998	10.9		27.1625	22.4
	14.33125	8.6		27.687499999999996	24.9
	14.218749999999998	7.9		27.275000000000006	26.6
	13.943749999999998	12.8		26.368750000000002	21.6
	13.65625	11.3		25.3625	25
	13.256250000000001	8.7		26.281249999999996	28.3
	13.2125	13.1		26.925	30.8
	13.568750000000001	9.4		26.16875	31.6
	12.049999999999999	10.9		24.70625	33.3
Jun.	12.325	11.9		24.825	35.9
	12.95625	19.1		25.4375	34.3
	12.70625	15.4		25.925000000000004	32.2
	13.418750000000003	13.4		25.368749999999995	32.8
	13.174999999999999	13.3		25.118750000000002	35.6
	13.19375	19.5		25.31875	32.2
	13.825	14		27.456249999999997	32
	14.9375	12.3		29.450000000000003	34
	15.537500000000001	12.7		29.8375	35.4
	15.968749999999998	13.8		29.406249999999996	36.2
	15.893749999999999	18.2		29.281250000000004	34.1
	16.2125	13.5		30.36874999999999	26.3
	17.268749999999997	13.6		31.5125	23.8
	17.312499999999996	12.8		31.093750000000007	27.9
	17.10625	14.2		31.20625	28.5
	17.481250000000003	13.2		32.38125	28
	18.38125	11.6		32.56875	27.8
	17.793749999999996	11.9		31.512499999999996	29.4
	17.562499999999996	14.5		31.05	32.7
	16.849999999999998	15.8		30.525000000000002	34.5
	16.86875	16.1		32.11875	34.4
	17.6625	12.3		33.36874999999999	34.8
	18.593749999999996	14		33.58125	38
	18.4875	19.9		33.78125	35
	19.35	16.7		34.4875	34.9
	19.6875	16.7		32.981249999999996	35.6
	18.30625	19		32.71249999999999	33.7
	18.2625	18.5		33.43125	31.6
	18.793749999999996	14.4		33.075	35.7
	18.23125	19.8		33.412499999999994	37
Jul.	18.85625	21.2		33.71875	39.1
	19.012499999999996	21.4		32.8875	37.5
	18.53125	16.6		32.41875	35
	18.162499999999998	17.3		32.79375	35.2
	18.43125	15.5		33.0375	34.9
	18.743750000000002	16.9		32.63125	31.7
	18.64375	15.2		32.84375	38.3
	18.45625	18.7		33.387499999999996	41.5
	18.3625	22.4		33.681250000000006	38.2
	18.306250000000002	18.8		32.8375	38.6
	18.249999999999996	19.9		33.48125	35.3
	18.087500000000002	15.2		33.5625	32.9
	19.318749999999994	15.1		33.59375	34.7
	19.61875	17.5		34.543749999999996	34
	20.193749999999998	16		36.175	33.3
	21.31875	16.2		36.6	35
	21.39375	17		35.96875	35.9
	20.556249999999995	19.2		34.06875	33.3
	20.531250000000004	12.6		35.3	29.1
	19.993750000000002	12		34.01875	29.2
	20.15625	10		33.2875	31.7
	19.606249999999996	10.7		33.81875	35.3
	19.475	13		33.69375	37.8
	20.05	16.9		33.5	39.6
	18.912499999999998	17.7		33.00625	37.9
	19.293750000000003	18.1		33.13125000000001	35.8
	18.8875	16.9		33.19375	35
	19.08125	17.1		33.5625	34.9
	19.51875	17.6		34.1625	34.1
	19.74375	17		32.956250000000004	33.1
	18.26875	15.8		32.50625	33.7
Aug.	19.106249999999996		18.4	33.09375		32.6
	19.668750000000003		19.9	33.36875		35.4
	19.325		19.8	33.45		35.1
	19.54375		21.8	33.8		34.5
	19.268749999999997		18.9	33.512499999999996		36
	18.86875		20.6	31.83125		38.8
	17.900000000000002		24.1	31.481250000000003		35
	18.23125		17.6	30.9125		29.9
	16.918750000000003		16.4	29.987499999999997		29.7
	16.5375		16.3	30.4875		30.5
	16.675		17.2	30.418750000000003		30.6
	17.14375		16.8	30.95		31.4
	17.05625		17.6	31.187499999999993		30.9
	17.575000000000003		17.2	31.406250000000004		31.4
	17.318749999999998		17.7	30.8875		30.9
	17.10625		16.6	29.525		29.1
	15.587499999999999		16.1	28.33125		29.1
	16.4625		16.5	30.08125		30.4
	16.168750000000003		16.4	30.962500000000002		30.9
	16.95625		16.6	30.181250000000002		29.6
	15.781250000000002		15.7	29.98125		30.3
	15.9625		16.2	30.512500000000006		30.5
	16.45625		16.3	30.193749999999994		29.5
	16.581249999999997		16	30.64375		30.2
	16.23125		15.8	28.931249999999995		28.5
	15.643749999999999		15.3	28.587500000000002		28.1
	15.381250000000001		15.3	27.868749999999995		28.2
	15.181249999999999		15.1	28.35		27.6
	15.212499999999999		15.1	28.4875		28.8
	15.2625		15.4	27.743750000000002		28.1
	13.99375		14.4	26.83125		27.1
Sep.	13.606250000000001			26.450000000000003
	13.462499999999999			25.93125
	13.200000000000003			25.731250000000003
	13.731249999999998			24.20625
	12.56875			24.962499999999995
	13.375			24.768749999999997
	12.768749999999997			23.61875
	11.974999999999996			24.23125
	11.75625			24.443750000000005
	12.524999999999999			24.699999999999996
	12.74375			25.150000000000002
	12.73125			24.36875
	12.062500000000002			24.012499999999996
	12.26875			23.5375
	11.950000000000001			22.39375
	11.500000000000002			22.906250000000004
	10.86875			22.031249999999996
	10.006249999999998			21.956250000000004
	10.49375			21.831249999999997
	9.399999999999999			21.35625
	9.21875			21.068749999999998
	9.36875			21.612499999999997
	9.931249999999999			21.9
	9.762500000000001			20.50625
	9.768749999999999			21.006249999999998
	10.03125			21.11875
	8.368750000000002			18.1375
	7.706249999999999			18.11875
	8.21875			18.1125
	8.231250000000001			18.38125
Oct.	8.2125			18.962500000000002
	8.7875			19.087500000000002
	8.6125			19.268749999999997
	8.193750000000001			17.98125
	8.206249999999999			18.599999999999998
	8.762500000000001			19.08125
	8.143749999999999			18.143749999999997
	8.75			17.062499999999996
	6.906249999999999			15.543750000000001
	6.2375			14.693749999999998
	5.631249999999999			15.393749999999999
	5.237500000000001			13.318750000000001
	5.11875			13.83125
	5.431249999999999			13.993749999999999
	5.46875			14.7125
	4.70625			14.1375
	5.9125000000000005			14.95625
	5.800000000000002			14.0375
	5.45625			13.418750000000001
	5.206250000000001			12.924999999999999
	5.543749999999998			14.625
	6.1875			14.38125
	5.5375000000000005			13.98125
	3.4062499999999996			11.7
	2.75625			10.849999999999998
	2.3874999999999997			10.86875
	2.05			10.38125
	2.0937499999999996			9.437500000000002
	2.1937499999999996			9.756250000000001
	3.9			11.118749999999999
	3.6562500000000004			11.175
Nov.	3.2124999999999995			10.93125
	2.1875			9.38125
	2.3937500000000003			9.51875
	1.7125			8.35625
	1.1875			7.987499999999999
	0.8812499999999999			7.74375
	-1.1102230246251565e-16			6.699999999999999
	0.775			8.46875
	1.05			8.675
	0.3687499999999998			7.062499999999999
	0.6499999999999999			7.75
	1.28125			7.743749999999999
	1.7062500000000003			8.49375
	0.3937499999999999			6.59375
	-1.1312500000000003			5.4375
	-1.36875			5.362500000000002
	-0.09374999999999997			6.625
	-0.20000000000000004			5.99375
	-0.8562500000000001			5.4937499999999995
	-0.6687499999999997			5.29375
	-0.8437500000000004			5.0125
	-0.5187499999999999			5.574999999999999
	-1.0437500000000002			4.55
	-0.94375			5.66875
	-0.5812500000000002			5.887500000000001
	0.4562500000000001			6.66875
	0.74375			5.8187500000000005
	0.38749999999999996			7.187499999999999
	-0.25			6.1625
	-0.7312500000000003			5.475
Dec.	-1.1125000000000003			5.3187500000000005
	-1.2312499999999995			5.1000000000000005
	-1.19375			4.89375
	-0.30625000000000013			6.46875
	-0.7999999999999999			6.34375
	-0.6812499999999999			6.549999999999999
	0.66875			6.518750000000001
	-0.6312500000000001			5.4624999999999995
	-0.9562500000000003			5.337499999999999
	-1.63125			4.15
	-1.91875			3.7125
	-2.3750000000000004			2.98125
	-1.8249999999999997			4.48125
	-0.31875000000000003			5.1812499999999995
	-0.9124999999999999			4.8125
	-1.9187500000000002			3.7375000000000003
	-3.519999999999999			3.0400000000000005

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

42°C

Highest Temp

22 Jul. 26

-3°C

Lowest Temp

24 Jan. 26

Seasonal Breakdown

Hottest MonthJuly35.04°C

Coldest MonthJanuary0.27°C

Wettest MonthFebruary4.29mm

Windiest MonthJune29.21km/h

Hermiston 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 Hermiston historically?

July is historically Hermiston's hottest month, with average maximum temperatures around 33°C. During peak heatwave events, the highest recorded temperatures have reached 48°C on 2021-06-29.

2. What is the coldest month in Hermiston historically?

January is Hermiston's coldest month, with average minimum temperatures around -1°C. The all-time record low of -18°C was recorded on 2016-12-17.

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

Hermiston's average annual rainfall is approximately 275.1mm, based on records spanning 17 years.

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

Hermiston historically records approximately 111.7 rainy days per year. December 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 Hermiston?

The all-time highest temperature recorded in Hermiston is 48°C on 2021-06-29.

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

The all-time lowest temperature recorded in Hermiston is -18°C on 2016-12-17.

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

Hermiston experiences its strongest winds during April. The historic gust record of 55.8 kph was recorded on 2025-12-17.

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

Usually, Hermiston's humidity peaks in January at around 77.6% and drops to its lowest in July at approximately 34.8%.

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