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Boise August Weather

Averages and records for weather in Boise, Idaho in the month of August.

Typical Boise August Weather 1991–2020
Average daily high	90.7 °F
Average daily low	60.6 °F
Average monthly precipitation	0.2 inches
Average monthly snow	none
Daily chance of precipitation	6.8%
Daily chance of snow	0%

Boise August Weather Records 1911–2024
Highest temperature	110 °F	August 10, 2018
Lowest temperature	34 °F	August 25, 1992
Highest daily low	77 °F	August 5, 1971
Lowest daily high	55 °F	August 31, 1964
Hottest average high temperature	96.8 °F	2022
Coldest average high temperature	80.8 °F	1968
Most daily precipitation	1.6 inches	August 13, 1979
Most monthly precipitation	2.8 inches	2023
Most daily snow	none	-
Most monthly snow	none	-

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
August 1	93.4	62.6	104	42
August 2	93.4	62.6	103	42
August 3	93.3	62.5	105	43
August 4	93.2	62.5	110	43
August 5	93.1	62.4	106	43
August 6	92.9	62.3	109	41
August 7	92.8	62.3	106	43
August 8	92.6	62.1	107	38
August 9	92.4	61.9	106	42
August 10	92.1	61.7	110	41
August 11	91.9	61.5	104	45
August 12	91.7	61.3	103	42
August 13	91.4	61.1	106	43
August 14	91.3	60.9	105	43
August 15	91.0	60.8	105	42
August 16	90.7	60.6	105	39
August 17	90.4	60.4	103	39
August 18	90.2	60.1	103	38
August 19	89.9	59.9	105	34
August 20	89.7	59.7	103	35
August 21	89.4	59.4	101	38
August 22	89.1	59.1	102	41
August 23	88.9	58.9	107	43
August 24	88.5	58.7	109	34
August 25	88.2	58.4	100	34
August 26	87.8	58.1	104	35
August 27	87.5	57.8	106	37
August 28	87.1	57.5	102	38
August 29	86.8	57.2	99	37
August 30	86.4	56.9	105	35
August 31	86.1	56.7	106	35

Weather Station Details

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