Boise County Weather in August
Average highs run from 90°F on August 1 to 82°F on August 31, and lows from 47°F to 40°F. Normal precipitation for the month is 0.44 in over about 2 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 86°F
- Average low
- 44°F
- Precipitation
- 0.44 in
- Record high
- 110°FAug 4, 1961
- Record low
- 34°FAug 24, 1992
- Chance of a freeze
- 30%
- Days of 90°F or more
- 12.8
- Daylight
- 14 h 35 min to 13 h 15 min
- Cloud cover
- 39%
- Humidity
- 37%
- Dew point
- 35°F
- Wind
- 4.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 90°F | 47°F | 104°F 1971 | 44°F 1987 | 8% | 0% |
| Aug 2 | 90°F | 47°F | 107°F 2024 | 43°F 1988 | 8% | 0% |
| Aug 3 | 89°F | 46°F | 105°F 1949 | 46°F 1988 | 8% | 0% |
| Aug 4 | 89°F | 46°F | 110°F 1961 | 47°F 1945 | 8% | 0% |
| Aug 5 | 89°F | 46°F | 106°F 1990 | 48°F 1969 | 8% | 0% |
| Aug 6 | 89°F | 46°F | 109°F 1990 | 43°F 1969 | 8% | 0% |
| Aug 7 | 89°F | 46°F | 106°F 1983 | 43°F 1946 | 8% | 0% |
| Aug 8 | 89°F | 46°F | 107°F 1990 | 40°F 1995 | 8% | 0% |
| Aug 9 | 88°F | 45°F | 106°F 2018 | 43°F 1985 | 8% | 0% |
| Aug 10 | 88°F | 45°F | 110°F 2018 | 49°F 1947 | 8% | 0% |
| Aug 11 | 88°F | 45°F | 104°F 2018 | 45°F 1985 | 8% | 0% |
| Aug 12 | 88°F | 45°F | 103°F 2015 | 44°F 1966 | 8% | 0% |
| Aug 13 | 87°F | 45°F | 106°F 2015 | 46°F 1995 | 8% | 0% |
| Aug 14 | 87°F | 44°F | 105°F 1994 | 45°F 1985 | 8% | 0% |
| Aug 15 | 87°F | 44°F | 104°F 2023 | 46°F 1987 | 8% | 0% |
| Aug 16 | 87°F | 44°F | 105°F 2023 | 44°F 1960 | 8% | 0% |
| Aug 17 | 86°F | 44°F | 103°F 2022 | 40°F 1978 | 8% | 0% |
| Aug 18 | 86°F | 43°F | 103°F 2008 | 38°F 1995 | 8% | 0% |
| Aug 19 | 86°F | 43°F | 105°F 1946 | 42°F 1980 | 8% | 0% |
| Aug 20 | 85°F | 43°F | 103°F 1967 | 46°F 1984 | 8% | 0% |
| Aug 21 | 85°F | 43°F | 101°F 2005 | 44°F 1988 | 8% | 0% |
| Aug 22 | 85°F | 42°F | 101°F 1950 | 45°F 1988 | 8% | 0% |
| Aug 23 | 84°F | 42°F | 107°F 1969 | 43°F 1960 | 8% | 0% |
| Aug 24 | 84°F | 42°F | 102°F 1966 | 34°F 1992 | 8% | 0% |
| Aug 25 | 84°F | 41°F | 99°F 1958 | 34°F 1992 | 8% | 0% |
| Aug 26 | 84°F | 41°F | 104°F 1996 | 39°F 1993 | 8% | 0% |
| Aug 27 | 83°F | 41°F | 101°F 2009 | 38°F 1960 | 8% | 0% |
| Aug 28 | 83°F | 41°F | 102°F 2009 | 39°F 1960 | 8% | 0% |
| Aug 29 | 83°F | 40°F | 99°F 2017 | 37°F 1980 | 8% | 0% |
| Aug 30 | 82°F | 40°F | 105°F 1955 | 37°F 1965 | 9% | 0% |
| Aug 31 | 82°F | 40°F | 106°F 2022 | 42°F 1943 | 9% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- August 1
- sunrise 6:31 AM, sunset 9:06 PM
- August 31
- sunrise 7:05 AM, sunset 8:20 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00104442 (Idaho City), public domain. Records: NOAA GHCN-Daily, station USW00024131, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.