Boulder Weather in 2021

Historical record of Boulder, Colorado weather for the year 2021 based on NOAA data.

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2021 Boulder Weather Extremes
Highest temperature	99 °F	September 10
Lowest temperature	-12 °F	February 15
Highest daily low	68 °F	September 19
Lowest daily high	4 °F	February 14
Most daily precipitation	1.6 inches	March 14
Most daily snow	17.5 inches	March 14
Total annual precipitation	20.7 inches	-
Total annual snow	77.6 inches	-

What was the hottest temperature in Boulder in 2021?

The highest temperature recorded in Boulder, Colorado in 2021 was 99 °F which happened 3 different times.

Highest Temperatures: All-Time By Year

Highest Temperatures in Boulder in 2021

Rank	Temperature	Date
1	99 °F	Sep 10
1	99 °F	Jun 17
1	99 °F	Jun 16
4	98 °F	Jul 8
5	96 °F	Jun 23
5	96 °F	Jun 15
7	95 °F	Sep 11
7	95 °F	Sep 9
7	95 °F	Sep 6
7	95 °F	Aug 17
7	95 °F	Jul 28

What was the coldest temperature in Boulder in 2021?

The lowest temperature recorded in Boulder, Colorado in 2021 was -12 °F which happened on Feb 15.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Boulder in 2021

Rank	Temperature	Date
1	-12 °F	February 15
2	-8 °F	February 14
3	-3 °F	February 13
4	0 °F	February 12
5	2 °F	February 16
6	4 °F	January 27
7	7 °F	December 18
8	9 °F	February 19
8	9 °F	February 9
8	9 °F	February 8

January 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	43	22	0.00	0.0
January 2	52	17	0.00	0.0
January 3	53	31	0.00	0.0
January 4	59	30	0.00	0.0
January 5	55	29	0.00	0.0
January 6	45	18	0.00	0.0
January 7	46	23	0.00	0.0
January 8	45	21	0.00	0.0
January 9	36	20	0.01	0.1
January 10	35	23	0.21	3.7
January 11	44	11	0.00	0.0
January 12	54	18	0.00	0.0
January 13	64	31	0.00	0.0
January 14	56	28	0.00	0.0
January 15	46	15	0.00	0.0
January 16	52	29	0.00	0.0
January 17	52	26	0.00	0.0
January 18	46	29	0.00	0.0
January 19	39	22	0.00	0.0
January 20	59	18	0.00	0.0
January 21	47	36	0.00	0.0
January 22	45	19	0.00	0.0
January 23	44	19	0.00	0.0
January 24	38	23	0.00	0.0
January 25	38	16	0.00	0.0
January 26	28	18	0.17	2.2
January 27	28	4	0.01	0.2
January 28	45	14	0.00	0.0
January 29	58	27	0.00	0.0
January 30	54	30	0.00	0.0
January 31	52	22	0.00	0.0

February 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	50	25	0.00	0.0
February 2	65	32	0.00	0.0
February 3	65	37	0.00	0.0
February 4	46	19	0.00	0.0
February 5	45	25	0.00	0.0
February 6	45	25	0.00	0.0
February 7	54	23	0.00	0.0
February 8	48	9	0.00	0.0
February 9	31	9	0.00	0.0
February 10	31	11	0.00	0.0
February 11	27	13	0.00	0.0
February 12	15	0	0.06	1.1
February 13	7	-3	0.05	0.9
February 14	4	-8	0.11	1.4
February 15	21	-12	0.02	0.3
February 16	42	2	0.00	0.0
February 17	35	16	0.00	0.1
February 18	34	15	0.37	7.1
February 19	45	9	0.00	0.0
February 20	50	21	0.00	0.0
February 21	43	20	0.12	0.5
February 22	56	32	0.00	0.0
February 23	60	36	0.00	0.0
February 24	54	20	0.00	0.1
February 25	35	11	0.55	8.1
February 26	45	13	0.00	0.0
February 27	41	24	0.00	0.0
February 28	39	11	0.00	0.0

March 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	49	13	0.00	0.0
March 2	62	24	0.00	0.0
March 3	62	30	0.00	0.0
March 4	48	30	0.01	0.0
March 5	60	32	0.00	0.0
March 6	67	27	0.00	0.0
March 7	69	42	0.00	0.0
March 8	68	35	0.00	0.0
March 9	69	39	0.00	0.0
March 10	60	32	0.23	0.9
March 11	44	22	0.00	0.0
March 12	42	32	0.13	0.6
March 13	40	29	0.38	2.4
March 14	32	29	1.63	17.5
March 15	40	17	0.06	0.8
March 16	40	21	0.00	0.0
March 17	46	25	0.03	0.3
March 18	46	20	0.00	0.0
March 19	58	25	0.00	0.0
March 20	64	32	0.00	0.0
March 21	52	33	0.12	0.5
March 22	40	29	0.25	2.6
March 23	41	24	0.00	0.0
March 24	40	26	0.07	1.6
March 25	50	22	0.00	0.0
March 26	49	32	0.03	0.0
March 27	54	27	0.01	0.0
March 28	63	26	0.00	0.0
March 29	71	42	0.00	0.0
March 30	62	25	0.04	0.6
March 31	54	20	0.00	0.0

April 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
April 1	71	23	0.00	0.0
April 2	74	41	0.00	0.0
April 3	78	39	0.00	0.0
April 4	80	43	0.00	0.0
April 5	77	46	0.00	0.0
April 6	76	36	0.07	0.0
April 7	63	30	0.00	0.0
April 8	70	37	0.00	0.0
April 9	67	35	0.00	0.0
April 10	70	26	0.00	0.0
April 11	65	40	0.00	0.0
April 12	53	23	0.00	0.0
April 13	39	26	0.13	0.8
April 14	39	26	0.08	0.6
April 15	39	31	0.21	1.5
April 16	38	28	0.58	4.7
April 17	44	25	0.05	0.9
April 18	58	27	0.00	0.0
April 19	54	26	0.19	1.5
April 20	37	10	0.73	7.6
April 21	35	26	0.06	0.2
April 22	50	25	0.01	0.2
April 23	57	29	0.06	0.0
April 24	64	31	0.00	0.0
April 25	79	39	0.00	0.0
April 26	76	47	0.00	0.0
April 27	69	41	0.03	0.0
April 28	59	37	1.00	0.0
April 29	69	36	0.00	0.0
April 30	79	42	0.00	0.0

May 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
May 1	84	51	0.00	0.0
May 2	79	46	0.12	0.0
May 3	54	36	1.15	0.0
May 4	60	33	0.18	0.0
May 5	60	38	0.03	0.0
May 6	69	36	0.00	0.0
May 7	82	43	0.00	0.0
May 8	76	45	0.00	0.0
May 9	61	37	0.33	0.0
May 10	45	35	0.45	0.0
May 11	42	33	0.46	0.2
May 12	62	33	0.00	0.0
May 13	75	35	0.00	0.0
May 14	72	41	0.00	0.0
May 15	67	43	0.02	0.0
May 16	59	46	0.00	0.0
May 17	63	50	0.12	0.0
May 18	64	43	0.82	0.0
May 19	71	42	0.00	0.0
May 20	78	42	0.02	0.0
May 21	76	49	0.00	0.0
May 22	73	43	0.00	0.0
May 23	75	51	0.39	0.0
May 24	73	36	0.00	0.0
May 25	76	46	0.00	0.0
May 26	78	46	0.00	0.0
May 27	77	45	0.00	0.0
May 28	79	44	0.00	0.0
May 29	71	45	0.03	0.0
May 30	64	47	1.43	0.0
May 31	57	46	0.21	0.0

June 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	68	39	0.03
June 2	74	44	0.00
June 3	82	46	0.00
June 4	87	50	0.00
June 5	91	53	0.00
June 6	88	59	0.01
June 7	85	50	0.00
June 8	88	51	0.00
June 9	89	54	0.00
June 10	91	53	0.00
June 11	90	58	0.00
June 12	86	46	0.00
June 13	92	54	0.00
June 14	94	57	0.00
June 15	96	57	0.00
June 16	99	62	0.00
June 17	99	59	0.00
June 18	91	65	0.00
June 19	89	58	0.01
June 20	81	64	0.00
June 21	75	50	0.23
June 22	93	48	0.00
June 23	96	61	0.00
June 24	85	63	0.03
June 25	77	53	0.44
June 26	69	53	1.03
June 27	72	50	0.01
June 28	72	51	0.20
June 29	76	49	0.00
June 30	81	50	0.00

July 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	77	57	1.36
July 2	83	52	0.04
July 3	87	55	0.19
July 4	85	57	0.00
July 5	86	56	0.00
July 6	83	59	0.00
July 7	87	56	0.20
July 8	98	56	0.00
July 9	94	67	0.00
July 10	91	58	0.00
July 11	84	52	0.00
July 12	88	52	0.00
July 13	87	62	0.15
July 14	78	58	0.01
July 15	82	52	0.02
July 16	90	54	0.00
July 17	91	56	0.00
July 18	91	56	0.00
July 19	92	58	0.00
July 20	93	56	0.00
July 21	89	61	0.00
July 22	94	61	0.00
July 23	93	65	0.12
July 24	86	62	0.01
July 25	90	61	0.00
July 26	91	56	0.60
July 27	93	55	0.00
July 28	95	58	0.00
July 29	89	58	0.00
July 30	91	61	0.02
July 31	76	61	0.48

August 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	80	56	0.00
August 2	85	54	0.00
August 3	82	62	0.03
August 4	81	60	0.09
August 5	91	54	0.00
August 6	90	53	0.03
August 7	81	57	0.00
August 8	91	57	0.00
August 9	94	59	0.00
August 10	94	56	0.00
August 11	93	57	0.00
August 12	86	60	0.00
August 13	84	55	0.00
August 14	93	56	0.00
August 15	89	62	0.03
August 16	91	56	0.00
August 17	95	56	0.00
August 18	92	59	0.00
August 19	82	61	0.28
August 20	79	49	0.09
August 21	82	50	0.06
August 22	90	52	0.00
August 23	90	56	0.00
August 24	93	56	0.00
August 25	88	57	0.00
August 26	83	55	0.05
August 27	91	56	0.00
August 28	89	57	0.00
August 29	83	57	0.00
August 30	91	51	0.00
August 31	94	55	0.00

September 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	87	57	0.00
September 2	82	58	0.00
September 3	81	60	0.04
September 4	84	50	0.00
September 5	87	50	0.00
September 6	95	52	0.00
September 7	86	55	0.00
September 8	87	49	0.00
September 9	95	49	0.00
September 10	99	55	0.00
September 11	95	61	0.03
September 12	85	57	0.03
September 13	83	55	0.00
September 14	78	57	0.00
September 15	90	48	0.00
September 16	91	57	0.00
September 17	74	44	0.00
September 18	91	43	0.00
September 19	88	68	0.00
September 20	79	53	0.00
September 21	66	37	0.08
September 22	79	39	0.00
September 23	83	50	0.00
September 24	73	45	0.00
September 25	87	42	0.00
September 26	90	53	0.00
September 27	88	45	0.00
September 28	82	57	0.00
September 29	71	52	0.31
September 30	54	42	0.05

October 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	67	41	0.00
October 2	72	43	0.00
October 3	79	43	0.00
October 4	82	47	0.00
October 5	83	43	0.00
October 6	77	43	0.00
October 7	79	48	0.00
October 8	76	46	0.00
October 9	68	48	0.00
October 10	70	38	0.00
October 11	70	38	0.00
October 12	54	38	0.04
October 13	61	33	0.08
October 14	50	30	0.02
October 15	56	26	0.00
October 16	71	31	0.00
October 17	75	35	0.00
October 18	76	43	0.00
October 19	65	37	0.00
October 20	65	27	0.00
October 21	63	34	0.00
October 22	75	34	0.00
October 23	73	39	0.00
October 24	70	36	0.00
October 25	73	36	0.00
October 26	71	38	0.02
October 27	59	32	0.00
October 28	59	34	0.00
October 29	76	36	0.00
October 30	76	43	0.00
October 31	55	36	0.01

November 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
November 1	39	33	0.01	0.0
November 2	44	33	0.01	0.0
November 3	61	35	0.01	0.0
November 4	70	32	0.00	0.0
November 5	75	45	0.00	0.0
November 6	75	35	0.00	0.0
November 7	78	44	0.00	0.0
November 8	55	31	0.00	0.0
November 9	55	28	0.00	0.0
November 10	57	37	0.00	0.0
November 11	55	26	0.00	0.0
November 12	56	24	0.00	0.0
November 13	67	39	0.00	0.0
November 14	66	31	0.00	0.0
November 15	73	53	0.00	0.0
November 16	72	56	0.00	0.0
November 17	59	24	0.02	0.3
November 18	51	16	0.00	0.0
November 19	66	29	0.00	0.0
November 20	58	35	0.00	0.0
November 21	58	25	0.00	0.0
November 22	70	31	0.00	0.0
November 23	70	33	0.00	0.0
November 24	57	32	0.01	0.2
November 25	61	17	0.01	0.2
November 26	72	34	0.00	0.0
November 27	58	34	0.00	0.0
November 28	67	28	0.00	0.0
November 29	74	47	0.00	0.0
November 30	59	36	0.00	0.0

December 2021 Boulder Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	72	42	0.00	0.0
December 2	72	40	0.00	0.0
December 3	61	33	0.00	0.0
December 4	69	28	0.00	0.0
December 5	64	31	0.00	0.0
December 6	31	14	0.00	0.0
December 7	56	21	0.00	0.0
December 8	56	25	0.00	0.0
December 9	51	38	0.00	0.0
December 10	42	24	0.09	1.0
December 11	49	16	0.00	0.0
December 12	65	33	0.00	0.0
December 13	56	28	0.00	0.0
December 14	62	31	0.00	0.0
December 15	56	31	0.03	0.0
December 16	46	31	0.00	0.0
December 17	45	26	0.00	0.0
December 18	39	7	0.00	0.0
December 19	62	18	0.00	0.0
December 20	62	33	0.00	0.0
December 21	63	25	0.00	0.0
December 22	63	32	0.00	0.0
December 23	63	41	0.00	0.0
December 24	55	38	0.04	0.0
December 25	54	34	0.00	0.0
December 26	52	23	0.00	0.0
December 27	44	21	0.00	0.0
December 28	37	23	0.00	0.0
December 29	33	10	0.00	0.0
December 30	44	16	0.00	0.0
December 31	44	25	0.26	4.1

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Weather Station Details

Years	Station	Coordinates
1893–2024	Boulder	location