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

Boulder Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-12.3	3.5		-1.6812500000000004	5.7
	-11.34375	4.7		1.8624999999999996	9.2
	-8.806249999999999	3		2.35	12.3
	-8.9375	4.3		2.2937499999999997	13.6
	-9.174999999999999	3.4		1.2562499999999999	12
	-10.0875	2		1.68125	9.1
	-8.293750000000001	1		1.2999999999999998	10.4
	-8.9125	-1.3		3.59375	5.1
	-7.500000000000001	-7.2		2.8125	-1.5
	-8.675	-7.3		2.99375	4.5
	-9.256249999999998	-1.6		1.6875	11.2
	-9.581249999999999	0.1		1.4499999999999997	12.4
	-8.71875	4.8		1.9375	12.4
	-9.5	-1		1.64375	6.4
Jan.	-9.893749999999999	-0.1		1.9500000000000002	12.7
	-7.699999999999999	-7.4		3.7	4.1
	-6.5375000000000005	-11		4.69375	-2.1
	-7.65	-4.6		4.1625	8.2
	-7.00625	-7.2		3.1999999999999997	4.5
	-8.193750000000001	-3.5		1.9687500000000004	10.4
	-7.631250000000001	-6.2		3.2687499999999994	8.5
	-7.268749999999999	-9.9		2.8312500000000003	1.1
	-7.8375	-12		3.1750000000000003	-7.6
	-7.531249999999999	-16.2		2.7750000000000004	-7.7
	-7.6499999999999995	-16.1		2.5312500000000004	-5.7
	-8.16875	-15.8		2.73125	4.5
	-7.60625	-4.3		2.925	7.1
	-7.493750000000001	-4.4		4.80625	7.3
	-7.29375	-2.9		4.04375	4.8
	-6.343749999999999	-3.7		5.406250000000001	5.6
	-6.44375	-0.7		4.0625	9.2
	-7.212500000000001	1.3		2.25	11.5
	-8.34375	2.8		3.325	10.5
	-8.1875	-1.8		3.46875	8.9
	-9.399999999999999	-4		1.6312499999999999	8.8
	-8.4	1.3		3.2249999999999996	11.5
	-8.056249999999999	1.2		2.3000000000000003	12.8
	-8.537499999999998	2.6		3.9875	13.6
	-8.0625	4		3.4499999999999997	15.9
	-9.237499999999999	2.8		2.6062500000000006	13.3
	-8.3	1		1.7499999999999996	7.7
	-10.168749999999998	1.4		1.0000000000000004	13.7
	-9.481250000000001	1.2		1.2749999999999995	10.6
	-7.481250000000001	2.3		4.593749999999998	10.9
	-7.2375	-2		4.71875	11.1
Feb.	-8.731250000000001	-0.4		3.4687500000000004	13.8
	-7.7562500000000005	6.3		4.1000000000000005	14.6
	-7.6875	1.5		4.18125	8.2
	-7.625	-2.3		4.18125	8.2
	-8.09375	-8.3		3.5124999999999997	0.5
	-7.8187500000000005	-9.5		2.65625	-4.1
	-8.15625	-8.9		2.9125	6.6
	-8.55625	-6.1		1.9750000000000003	11.2
	-10.012499999999998	1.5		0.9687500000000002	15.1
	-9.93125	6.3		2.16875	17.1
	-8.799999999999999	4.7		2.55625	15.7
	-9.256250000000003	4.7		3.9312500000000004	11.7
	-8.612499999999999	3		5.23125	15.5
	-6.7625	1.8		6.112500000000001	15.5
	-5.975000000000001	0.8		6.56875	14.3
	-5.5375	3.8		7.00625	18.8
	-5.206249999999999	2.7		7.7375	6.9
	-6.125	0.9		5.737500000000001	15.7
	-6.2562500000000005	2.4		6.58125	14
	-5.481249999999999	-2.7		7.2875	6.5
	-4.63125	-4.6		7.6875	9.7
	-4.36875	2.7		6.793749999999998	14.5
	-4.2625	4.5		8.143749999999999	19.2
	-4.46875	4.3		8.881250000000001	19.4
	-3.875	0		9.66875	8.5
	-2.8375000000000004	4.7		10.437500000000002	15.6
	-2.18125	4.1		10.337499999999999	16.7
	-1.9124999999999999	6		10.11875	20.3
Mar.	-1.9875	-6.2		10.9375	5.2
	-1.9062499999999998	-7.1		10.362499999999999	9.6
	-2.0437499999999997	6.3		10.70625	18.4
	-2.7125	8.5		9.53125	22.2
	-3.9437500000000005	11		8.55	24.8
	-4.4875	13.3		10.06875	26.5
	-3.7437499999999995	11.9		9.375	29.1
	-2.3999999999999995	9.3		9.7375	18.2
	-1.975	7		10.306249999999999	20.7
	-2.875000000000001	8.8		9.262500000000001	22.1
	-3.6562499999999996	13.9		9.4125	28.5
	-2.8874999999999993	4.3		9.812499999999998	19.5
	-2.26875	3.7		10.7375	8.5
	-2.1437500000000007	3.5		11.0125	23.6
	-1.7625	12.8		11.762499999999998	24.1
	-1.0187500000000003	11.1		11.912500000000003	24.8
	-0.6437499999999998	3.2		11.712499999999999	10.7
	-1.0250000000000001	2.2		12.3625	12.3
	-0.5249999999999998	2.5		12.9375	21.8
	-2.03125	0.5		10.049999999999999	11.9
	-2.75625	2.5		10.924999999999997	15.2
	-1.3187499999999999	4.3		13.64375	17.2
	-0.7250000000000001	2.5		12.437499999999996	20.2
	-0.34374999999999994	3.2		14.24375	22.8
	1.7125	5.5		16.275000000000002	23.8
	0.9437500000000001	5		14.48125	22.4
	-0.9687500000000004	2.7		13.525	15.6
	0.51875	6.1		16.325000000000003	22.2
	2.4625000000000004	7.4		15.775	23.5
	-0.10000000000000003	8.5		12.39375	20.5
	-1.18125	7.1		11.73125	10.4
Apr.	-0.49999999999999994	5.4		12.64375	20
	0.2875	9.5		12.0375	22.5
	0.012499999999999983	-2.3		11.574999999999998	4.4
	-0.8437500000000002	-5.2		12.256250000000001	13.1
	-0.46875	0.4		12.356250000000003	20.7
	-0.18124999999999997	5.2		11.78125	24.1
	0.6249999999999998	8.6		12.74375	25.9
	0.6124999999999998	6.5		13.281249999999998	25.1
	1.2500000000000004	2.9		14.056250000000002	15.8
	1.29375	-0.9		14.018749999999997	20
	1.6437499999999998	-5.1		14.6625	11.8
	2.6875000000000004	-1.5		15.4875	12.2
	3.18125	1.1		15.068749999999998	10.5
	2.54375	2.4		15.381250000000001	14.6
	1.9312500000000001	-0.6		13.2	13.2
	1.7937500000000002	0.4		13.38125	10.3
	2.30625	-2.1		13.681249999999999	15
	1.8375	1		13.2125	19.9
	1.6875	5.9		15.493750000000002	21.9
	3.8625000000000003	6.2		17.2375	19.4
	4.325	0.4		18.225	3.6
	5.168749999999999	-4.6		19.1	3
	5.625	-4.3		17.45625	18.5
	4.3125	3.7		15.30625	20.6
	3.1187499999999995	7.2		15.243750000000002	23.6
	3.3937500000000007	3.1		15.4	19.9
	3.44375	6.9		14.24375	28.6
	2.825	8.3		14.068750000000001	24.5
	4.156249999999999	8.4		17.2	29.1
	5.16875	12.2		17.60625	28.2
May	6.09375	9.6		17.624999999999996	28
	6.34375	8.9		18.675	22.6
	6.2749999999999995	5.6		18.8625	16.7
	6.50625	1.2		16.55625	4.4
	6.01875	-4.9		16.39375	7.7
	4.9375	4.6		15.975	15.7
	5.01875	1.9		17.1875	19.3
	5.581249999999999	0.5		18.162499999999998	17.2
	6.331249999999999	2.9		18.893749999999997	23.1
	6.46875	8.4		18.575000000000003	25.5
	5.7562500000000005	9.9		18.599999999999998	26.3
	7.0375	10.1		20.10625	23.7
	7.875	9.1		21.0875	19
	8.16875	7.9		20.475	22.6
	7.718750000000001	9.6		19.887499999999996	24.4
	7.899999999999999	7.8		20.168750000000003	22.3
	8.06875	6.9		21.949999999999996	25.8
	9.025	7.8		22.193749999999994	25.7
	9.4625	7.1		23.39375	26.3
	10.35625	9.6		22.712500000000002	26.7
	10.987500000000002	10.6		24.75	30
	11.762500000000001	12.5		23.85625	28.9
	11.38125	12.7		24.80625	31.4
	11.549999999999999	13.9		24.968749999999996	32
	11.731250000000001	10.4		24.41875	25.1
	10.906250000000002	10.4		24.737500000000004	31.5
	12.024999999999999	9.3		26.29375	29
	12.26875	6.9		24.424999999999997	27
	12.099999999999998	7.2		24.087500000000002	32.1
	12.212499999999999	8.4		26.312500000000004	25.2
	12.643749999999997	6.9		26.518750000000004	22.7
Jun.	12.1625	5.9		26.1	27.6
	13.043750000000001	8.1		27.481249999999996	32.6
	12.631250000000001	12.6		25.95	34.4
	12.731250000000001	6.5		26.1125	30
	12.90625	10.6		26.718750000000004	27.8
	13.100000000000005	8.8		26.25	34
	12.762500000000001	10.1		26.175	31.9
	13.781250000000002	9.5		26.237500000000004	31.4
	12.575	11.8		25.356250000000003	27.6
	13.174999999999999	10.7		26.4875	29.2
	13.5375	12.1		27.056250000000002	26.4
	14.199999999999998	10.5		27.94375	29.8
	14.218749999999998	14.4		28.018750000000004	33.2
	14.41875	13		28.83125	31.7
	15.03125	12.5		28.4375	29.2
	13.837499999999999	10.9		26.431249999999995	30.9
	13.337500000000002	10.4		26.3	30.5
	14.237499999999999	9.5		27.375	29.8
	14.750000000000002	12.9		28.800000000000004	32.8
	15.093749999999998	12.6		28.625	31.6
	15.006249999999996	13		27.681250000000002	34.2
	15.181249999999999	15.3		27.131249999999998	35.3
	14.44375	13.9		27.25625	32.8
	15.025000000000002	14.3		26.69375	33.6
	14.906249999999998	14.1		28.825	32.6
	15.56875	11.3		29.150000000000006	32.2
	15.300000000000002	13.7		29.36875	34.9
	15.306250000000002	15.8		28.318750000000005	35.5
	15.81875	14.9		29.26875	36.2
	16.5375	14.9		28.775	34.3
Jul.	15.68125	13.9		27.681249999999995	33.5
	14.9625	14.5		28.15	32.5
	15.5625	14.9		29.6125	33.2
	16.74375	14.9		30.137499999999996	33.6
	16.89375	15		30.281249999999993	35.4
	16.45	18.2		28.849999999999998	37
	16.36875	19.7		29.131249999999998	35.2
	16.1375	15.5		29.29375	31.9
	16.606250000000003	16		30.05	30.1
	16.168749999999996	16.1		29.24375	34.4
	16.5	18.2		29.412499999999998	35.8
	16.224999999999998	20.6		28.574999999999996	36.3
	15.887500000000001	18.9		28.268749999999997	32.4
	15.856249999999998	16.1		27.612499999999997	31.5
	15.575000000000001	15.7		27.512500000000003	30.5
	15.262500000000001	15.5		27.318749999999998	32.8
	15.281249999999998	14.7		27.55625	31.6
	15.624999999999998	14.1		28.3	33.2
	15.38125	16.5		28.518749999999997	37.3
	16.01875	18		27.181250000000002	35.8
	15.456249999999999	11.9		29.39375	25.5
	16.05	7.6		28.1625	30.2
	15.70625	13		27.69375	35.5
	15.612499999999997	16.2		27.306249999999995	34.7
	15.50625	17.2		27.474999999999998	37.4
	14.849999999999998	18.4		27.049999999999997	35.2
	14.318750000000001	16.4		27.093750000000004	33.2
	15.15625	17.3		27.743750000000002	33.7
	15.6625	15.7		28.50625	32.1
	14.668749999999998	12.8		27.462500000000002	24.9
	15.206250000000002	11.9		27.29375	27.9
Aug.	14.91875		12.9	28.9625		26.6
	15.212500000000002		12.2	27.5875		29.7
	14.762500000000001		13.4	28.606250000000006		30.9
	14.762500000000003		16.5	29.018749999999997		33.6
	14.768749999999999		11.6	27.412499999999998		30.6
	14.512500000000003		9.4	27.625		27.6
	14.593750000000002		12.9	27.512499999999992		31.9
	14.974999999999998		15.5	28.0125		34.6
	14.825		14.6	27.662499999999998		27.5
	14.468749999999998		14.5	27.243750000000002		26.9
	14.65		14.5	27.03125		26.6
	14.850000000000001		14.7	26.306250000000002		26.6
	14.756249999999998		14.5	27.281250000000004		27.7
	14.393749999999999		14.6	27.19375		26.7
	14.299999999999999		14	27.237499999999997		26.9
	14.437499999999998		14	28.275		27.8
	14.649999999999999		14.2	28.006249999999994		27.7
	13.662500000000001		13.8	27.887500000000003		28.1
	14.325000000000001		14.4	27.181250000000006		27.5
	14.01875		13.8	27.25		27.2
	13.5		13.5	27.81875		27.5
	13.631249999999998		13.4	26.4125		26.3
	12.81875		13.3	26.1		26.1
	13.31875		12.7	26.531250000000004		26.1
	13.018749999999999		12	26.650000000000002		25.8
	11.237499999999999		11.4	24.974999999999998		24.4
	10.9		11.2	22.574999999999992		23.5
	10.687500000000002		11.1	23.000000000000004		23.3
	11.23125		10.8	24.2		22.8
	11.3625		10.8	24.862499999999997		24.4
	10.95		11.2	23.556250000000006		24.6
Sep.	11.300000000000002			23.8125
	10.862499999999999			24.668750000000006
	11.1875			23.8625
	10.662500000000001			23.93125
	11.0875			25.425
	11.356250000000001			24.806250000000002
	10.218750000000002			23.156249999999996
	10.15625			22.7625
	9.843749999999998			21.725
	9.7625			23.281249999999996
	9.331249999999999			23.28125
	10.024999999999999			24.15
	10.76875			23.162499999999998
	9.925			21.78125
	9.337500000000002			22.324999999999996
	9.03125			21.843749999999996
	9.593749999999998			20.6875
	8.075			19.8875
	8.200000000000001			20.831249999999997
	7.30625			20.05
	6.312500000000001			18.46875
	6.4125			17.06875
	5.44375			17.868750000000002
	5.55			18.23125
	4.831250000000001			17.5
	4.574999999999999			15.95625
	5.05625			18.093749999999996
	4.9624999999999995			16.206249999999997
	3.70625			16.275
	3.4375000000000004			16.343749999999996
Oct.	3.31875			17.60625
	4.4937499999999995			17.65625
	4.75625			18.9125
	4.9625			16.9375
	4.0125			16.974999999999998
	4.175			17
	4.5249999999999995			17.2375
	5.168749999999999			17.34375
	4.5375000000000005			15.756250000000001
	3.7625			14.831249999999999
	3.075			16.65625
	1.55625			12.643749999999997
	-1.7124999999999997			8.90625
	-1.9875000000000005			10.23125
	-0.30625000000000013			12.731250000000001
	-0.875			10.275000000000002
	-0.7374999999999999			11.375000000000002
	1.5875			13.037499999999998
	0.61875			13.068750000000001
	1.30625			12.45
	0.73125			12.1875
	1.2062499999999998			12.618749999999997
	-0.06250000000000006			11.88125
	-0.27499999999999986			10.887500000000001
	-1.1			11.443749999999998
	-1.06875			11.093749999999998
	-1.5125000000000004			10.9125
	-4.106249999999999			6.65625
	-4.618750000000001			6.44375
	-2.89375			9.24375
	-2.1312499999999996			10.606250000000003
Nov.	-1.7499999999999996			10.262500000000001
	-1.9437499999999999			10.45
	-2.96875			8.4
	-3.3125			8.774999999999999
	-2.6125000000000003			9.1875
	-2.58125			8.381250000000001
	-3.75625			7.8125
	-2.4312500000000004			9.668750000000001
	-2.5062499999999996			8.643749999999999
	-4.137499999999999			7.23125
	-5.6125			5.518749999999999
	-4.6875			6.887499999999998
	-4.6			7.275
	-4.525			6.293749999999999
	-5.793749999999999			5.375
	-6.45625			3.9562499999999994
	-4.71875			6.2749999999999995
	-4.6875			6.906250000000001
	-5.6812499999999995			5.7125
	-5.8812500000000005			4.8625
	-7.037499999999999			4.862499999999999
	-6.56875			4.26875
	-5.112500000000001			5.6375
	-5			5.500000000000001
	-5.562499999999999			5.3687499999999995
	-5.662499999999999			5.812499999999999
	-5.774999999999999			5.4125
	-4.8125			6.0875
	-4.862500000000001			5.1625000000000005
	-5			4.83125
Dec.	-5.712499999999999			3.5125
	-6.6			3.8375
	-7.55625			3.4250000000000003
	-6.731250000000002			5.2562500000000005
	-5.61875			4.7625
	-5.825000000000001			5.3375
	-5.931249999999999			6.0375
	-6.34375			4.1499999999999995
	-7.05625			4.4437500000000005
	-6.775			3.6499999999999995
	-6.768750000000001			3.8
	-8.08125			1.5937499999999998
	-9.31875			2.5875
	-8.84375			1.4437499999999999
	-9.587500000000002			1.15625
	-9.912499999999998			1.6062499999999997
	-11.546666666666665			0.1866666666666667

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

37°C

Highest Temp

8 Aug. 26

-16°C

Lowest Temp

24 Jan. 26

Seasonal Breakdown

Hottest MonthJuly33.35°C

Coldest MonthJanuary-3.79°C

Wettest MonthMay4.11mm

Windiest MonthJuly26.2km/h

Boulder 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 Boulder historically?

July is historically Boulder's hottest month, with average maximum temperatures around 29°C. During peak heatwave events, the highest recorded temperatures have reached 37°C on 2026-08-08.

2. What is the coldest month in Boulder historically?

January is Boulder's coldest month, with average minimum temperatures around -8°C. The all-time record low of -28°C was recorded on 2022-12-22.

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

Boulder's average annual rainfall is approximately 526.8mm, based on records spanning 17 years.

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

Boulder historically records approximately 141.8 rainy days per year. May has the highest number of rain days at an average of 18.5 days.

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

The all-time highest temperature recorded in Boulder is 37°C on 2026-08-08.

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

The all-time lowest temperature recorded in Boulder is -28°C on 2022-12-22.

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

Boulder experiences its strongest winds during April. The historic gust record of 72.4 kph was recorded on 2024-04-06.

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

Usually, Boulder's humidity peaks in February at around 66.3% and drops to its lowest in September at approximately 42.02%.

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Boulder Historic Weather RecordsAnalyse hottest, coldest, windiest & wettest days

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Yearly Summary 2026

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