Boise Weather in 2021

Historical record of Boise, Idaho weather for the year 2021 based on NOAA data.

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2021 Boise Weather Extremes
Highest temperature	107 °F	July 6
Lowest temperature	9 °F	December 31
Highest daily low	80 °F	July 19
Lowest daily high	24 °F	December 28
Most daily precipitation	0.8 inches	July 31
Most daily snow	5.5 inches	February 13
Total annual precipitation	12.2 inches	-
Total annual snow	30.2 inches	-

What was the hottest temperature in Boise in 2021?

The highest temperature recorded in Boise, Idaho in 2021 was 107 °F which happened on July 6.

Highest Temperatures: All-Time By Year

Highest Temperatures in Boise in 2021

Rank	Temperature	Date
1	107 °F	Jul 6
2	105 °F	Aug 4
2	105 °F	Jun 29
4	104 °F	Jul 10
4	104 °F	Jun 30
6	103 °F	Jul 3
6	103 °F	Jul 1
6	103 °F	Jun 28
6	103 °F	Jun 3
10	102 °F	Jul 26
10	102 °F	Jul 12
10	102 °F	Jul 2

What was the coldest temperature in Boise in 2021?

The lowest temperature recorded in Boise, Idaho in 2021 was 9 °F which happened on Dec 31.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Boise in 2021

Rank	Temperature	Date
1	9 °F	December 31
2	12 °F	December 29
3	14 °F	February 14
4	15 °F	December 30
4	15 °F	December 28
6	19 °F	December 15
7	20 °F	December 10
7	20 °F	February 28
7	20 °F	February 18
10	21 °F	December 27
10	21 °F	February 13
10	21 °F	February 10
10	21 °F	January 19

January 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	43	31	0.00	0.0
January 2	46	33	0.01	0.1
January 3	50	37	0.24	0.0
January 4	48	37	0.19	0.0
January 5	44	32	0.00	0.0
January 6	45	29	0.00	0.0
January 7	43	33	0.20	0.3
January 8	40	28	0.03	0.1
January 9	41	30	0.01	0.0
January 10	39	28	0.00	0.0
January 11	41	24	0.00	0.0
January 12	43	29	0.12	0.0
January 13	50	29	0.10	0.0
January 14	47	28	0.00	0.0
January 15	38	27	0.00	0.0
January 16	42	24	0.00	0.0
January 17	43	28	0.00	0.0
January 18	45	26	0.00	0.0
January 19	43	21	0.00	0.0
January 20	44	23	0.00	0.0
January 21	42	29	0.02	0.0
January 22	38	32	0.04	0.0
January 23	41	25	0.00	0.0
January 24	40	24	0.00	0.0
January 25	36	26	0.00	0.0
January 26	38	22	0.00	0.0
January 27	47	32	0.00	0.0
January 28	52	40	0.00	0.0
January 29	42	34	0.28	0.0
January 30	49	31	0.00	0.0
January 31	52	34	0.00	0.0

February 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	55	35	0.00	0.0
February 2	59	37	0.12	0.0
February 3	40	31	0.01	0.0
February 4	42	25	0.00	0.0
February 5	50	35	0.01	0.0
February 6	51	28	0.00	0.0
February 7	48	31	0.00	0.0
February 8	42	22	0.00	0.0
February 9	46	26	0.00	0.0
February 10	50	21	0.00	0.0
February 11	37	27	0.14	1.0
February 12	32	27	0.29	4.4
February 13	31	21	0.52	5.5
February 14	33	14	0.00	0.0
February 15	39	32	0.30	0.9
February 16	40	33	0.05	0.0
February 17	38	26	0.00	0.0
February 18	37	20	0.04	1.0
February 19	43	31	0.09	0.3
February 20	41	30	0.02	0.2
February 21	44	24	0.00	0.0
February 22	51	33	0.00	0.0
February 23	49	32	0.00	0.0
February 24	43	26	0.00	0.0
February 25	39	24	0.00	0.0
February 26	41	27	0.01	0.3
February 27	41	25	0.02	0.6
February 28	41	20	0.00	0.0

March 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	52	27	0.00	0.0
March 2	56	30	0.00	0.0
March 3	60	31	0.00	0.0
March 4	63	31	0.00	0.0
March 5	68	39	0.00	0.0
March 6	57	35	0.04	0.0
March 7	57	33	0.00	0.0
March 8	54	34	0.02	0.0
March 9	51	28	0.00	0.0
March 10	52	25	0.00	0.0
March 11	56	25	0.00	0.0
March 12	55	26	0.00	0.0
March 13	59	26	0.00	0.0
March 14	66	34	0.00	0.0
March 15	62	36	0.00	0.0
March 16	56	33	0.00	0.0
March 17	62	32	0.00	0.0
March 18	69	41	0.00	0.0
March 19	59	47	0.19	0.0
March 20	54	37	0.00	0.0
March 21	51	31	0.00	0.0
March 22	46	33	0.46	0.5
March 23	53	31	0.00	0.0
March 24	48	27	0.05	0.0
March 25	50	35	0.19	0.0
March 26	56	32	0.00	0.0
March 27	62	32	0.00	0.0
March 28	75	41	0.00	0.0
March 29	61	31	0.00	0.0
March 30	48	27	0.00	0.0
March 31	60	29	0.00	0.0

April 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	75	36	0.00
April 2	73	42	0.00
April 3	78	46	0.00
April 4	73	47	0.00
April 5	53	40	0.00
April 6	60	33	0.00
April 7	71	40	0.00
April 8	55	35	0.00
April 9	62	28	0.00
April 10	61	36	0.00
April 11	52	28	0.00
April 12	57	26	0.00
April 13	57	33	0.00
April 14	58	38	0.00
April 15	63	40	0.00
April 16	63	42	0.00
April 17	67	39	0.00
April 18	75	40	0.00
April 19	65	43	0.00
April 20	61	34	0.00
April 21	66	38	0.00
April 22	69	35	0.00
April 23	66	38	0.00
April 24	60	48	0.53
April 25	56	43	0.07
April 26	47	40	0.36
April 27	62	37	0.00
April 28	71	41	0.00
April 29	82	48	0.00
April 30	83	53	0.00

May 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	75	51	0.05
May 2	64	46	0.00
May 3	67	40	0.00
May 4	70	43	0.00
May 5	77	43	0.00
May 6	90	53	0.00
May 7	70	47	0.00
May 8	60	37	0.00
May 9	63	36	0.00
May 10	67	38	0.00
May 11	70	41	0.00
May 12	82	46	0.00
May 13	82	53	0.00
May 14	81	53	0.00
May 15	77	52	0.00
May 16	85	51	0.00
May 17	86	58	0.00
May 18	73	54	0.00
May 19	61	46	0.00
May 20	63	40	0.00
May 21	55	42	0.03
May 22	57	42	0.45
May 23	63	42	0.00
May 24	69	50	0.01
May 25	66	47	0.23
May 26	71	48	0.00
May 27	82	52	0.00
May 28	70	51	0.00
May 29	77	46	0.00
May 30	83	48	0.00
May 31	87	53	0.00

June 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	90	57	0.00
June 2	96	63	0.00
June 3	103	64	0.00
June 4	94	66	0.00
June 5	86	61	0.00
June 6	77	49	0.00
June 7	80	47	0.00
June 8	81	54	0.00
June 9	79	56	0.00
June 10	63	45	0.71
June 11	78	51	0.00
June 12	83	61	0.00
June 13	97	64	0.00
June 14	94	65	0.00
June 15	89	61	0.00
June 16	82	52	0.00
June 17	91	55	0.00
June 18	97	58	0.00
June 19	95	60	0.00
June 20	91	63	0.00
June 21	96	64	0.00
June 22	98	69	0.00
June 23	92	60	0.00
June 24	95	63	0.00
June 25	94	61	0.00
June 26	95	65	0.00
June 27	99	70	0.00
June 28	103	72	0.00
June 29	105	74	0.00
June 30	104	78	0.00

July 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	103	72	0.00
July 2	102	72	0.00
July 3	103	72	0.00
July 4	101	74	0.00
July 5	101	74	0.00
July 6	107	71	0.00
July 7	99	79	0.00
July 8	99	64	0.00
July 9	95	64	0.00
July 10	104	69	0.00
July 11	98	71	0.00
July 12	102	66	0.00
July 13	97	67	0.00
July 14	99	67	0.00
July 15	98	70	0.00
July 16	96	63	0.00
July 17	98	62	0.00
July 18	101	67	0.00
July 19	97	80	0.00
July 20	92	73	0.05
July 21	95	68	0.01
July 22	91	60	0.00
July 23	93	60	0.00
July 24	95	60	0.00
July 25	98	65	0.00
July 26	102	70	0.00
July 27	100	71	0.00
July 28	97	71	0.00
July 29	99	70	0.00
July 30	100	77	0.00
July 31	96	69	0.83

August 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	82	69	0.14
August 2	93	68	0.00
August 3	96	69	0.00
August 4	105	67	0.00
August 5	97	71	0.00
August 6	82	67	0.00
August 7	94	61	0.00
August 8	87	65	0.00
August 9	83	53	0.00
August 10	93	58	0.00
August 11	98	62	0.00
August 12	100	67	0.00
August 13	98	66	0.00
August 14	97	67	0.00
August 15	98	66	0.00
August 16	97	68	0.00
August 17	82	60	0.00
August 18	77	53	0.00
August 19	80	52	0.00
August 20	85	56	0.00
August 21	77	57	0.05
August 22	84	52	0.00
August 23	82	56	0.00
August 24	82	50	0.00
August 25	86	56	0.00
August 26	84	59	0.00
August 27	80	54	0.00
August 28	83	51	0.00
August 29	91	57	0.00
August 30	89	60	0.00
August 31	81	54	0.00

September 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	80	47	0.00
September 2	80	47	0.00
September 3	82	47	0.00
September 4	90	51	0.00
September 5	93	55	0.00
September 6	91	56	0.00
September 7	94	60	0.00
September 8	93	62	0.00
September 9	98	64	0.00
September 10	78	55	0.11
September 11	79	53	0.00
September 12	84	54	0.00
September 13	81	52	0.00
September 14	82	49	0.00
September 15	84	52	0.00
September 16	71	48	0.00
September 17	87	47	0.00
September 18	85	62	0.01
September 19	66	50	0.08
September 20	67	41	0.00
September 21	77	47	0.00
September 22	82	53	0.00
September 23	77	51	0.00
September 24	83	52	0.00
September 25	86	53	0.00
September 26	86	58	0.00
September 27	86	54	0.00
September 28	66	45	0.17
September 29	65	38	0.00
September 30	72	42	0.00

October 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	72	44	0.00
October 2	78	48	0.00
October 3	83	47	0.00
October 4	87	49	0.00
October 5	83	55	0.00
October 6	71	51	0.00
October 7	70	47	0.04
October 8	61	50	0.46
October 9	62	44	0.01
October 10	64	43	0.04
October 11	56	39	0.00
October 12	55	35	0.00
October 13	47	34	0.00
October 14	55	32	0.00
October 15	65	40	0.00
October 16	73	38	0.00
October 17	75	42	0.00
October 18	63	47	0.00
October 19	66	39	0.00
October 20	68	54	0.00
October 21	76	52	0.00
October 22	70	44	0.39
October 23	54	42	0.02
October 24	55	47	0.50
October 25	52	41	0.43
October 26	53	40	0.06
October 27	61	46	0.00
October 28	69	50	0.00
October 29	71	50	0.00
October 30	59	41	0.00
October 31	56	40	0.00

November 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	55	40	0.15
November 2	60	47	0.00
November 3	65	42	0.00
November 4	63	48	0.04
November 5	63	42	0.00
November 6	57	45	0.02
November 7	50	34	0.00
November 8	50	34	0.00
November 9	50	36	0.41
November 10	50	35	0.00
November 11	49	42	0.02
November 12	62	41	0.00
November 13	61	43	0.01
November 14	63	47	0.00
November 15	61	45	0.00
November 16	56	29	0.00
November 17	43	23	0.00
November 18	46	31	0.08
November 19	54	42	0.21
November 20	47	32	0.00
November 21	47	29	0.00
November 22	50	28	0.00
November 23	43	25	0.11
November 24	43	28	0.00
November 25	49	26	0.00
November 26	43	31	0.00
November 27	52	32	0.00
November 28	55	32	0.00
November 29	53	31	0.00
November 30	51	31	0.00

December 2021 Boise Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	55	33	0.00	0.0
December 2	53	32	0.00	0.0
December 3	53	32	0.00	0.0
December 4	52	29	0.00	0.0
December 5	49	31	0.00	0.0
December 6	38	30	0.23	0.0
December 7	44	33	0.01	0.0
December 8	50	31	0.00	0.0
December 9	37	30	0.01	0.4
December 10	38	20	0.03	0.4
December 11	42	34	0.00	0.0
December 12	50	37	0.06	0.0
December 13	53	41	0.00	0.0
December 14	50	26	0.30	2.1
December 15	33	19	0.01	0.1
December 16	35	30	0.03	0.9
December 17	38	26	0.00	0.0
December 18	35	25	0.00	0.0
December 19	38	27	0.01	0.0
December 20	50	30	0.00	0.0
December 21	42	25	0.00	0.0
December 22	46	30	0.04	0.0
December 23	46	33	0.22	0.4
December 24	37	26	0.19	2.3
December 25	37	27	0.03	0.6
December 26	36	26	0.14	2.1
December 27	31	21	0.02	0.8
December 28	24	15	0.00	0.0
December 29	27	12	0.12	2.8
December 30	30	15	0.09	2.1
December 31	30	9	0.00	0.0

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Weather Station Details

Years	Station	Coordinates
1940–2024		location
1911–1939	Meridian 1 W	location