August weather in Boise City, ID
The average temperature in Boise City in August is 75.8°F (60.8°F–90.7°F). Average precipitation: 0.17 inches.
August is a summer month in Boise City, and is warmer than the annual average of 53.2°F. Daily temperatures swing about 29.9°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 13h 48m. For travel, August is hot.
Avg High
90.7°F
Avg Low
60.8°F
Precipitation
0.17 in
Daylight
13h 48m
August records in Boise City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 104.0°F (1971) | 44.1°F (1987) | 0.78 in (1960) |
| August 2 | 107.1°F (2024) | 43.0°F (1988) | 0.06 in (1953) |
| August 3 | 105.1°F (1949) | 46.0°F (1988) | 0.09 in (1965) |
| August 4 | 109.9°F (1961) | 46.9°F (1945) | 0.11 in (1950) |
| August 5 | 106.0°F (1990) | 48.0°F (1969) | 0.39 in (1950) |
| August 6 | 109.0°F (1990) | 43.0°F (1969) | 0.91 in (2009) |
| August 7 | 106.0°F (1983) | 43.0°F (1946) | 0.56 in (2009) |
| August 8 | 107.1°F (1990) | 39.9°F (1995) | 0.26 in (2009) |
| August 9 | 106.0°F (2018) | 43.0°F (1985) | 0.59 in (1963) |
| August 10 | 109.9°F (2018) | 48.9°F (1947) | 0.12 in (1983) |
| August 11 | 104.0°F (2018) | 45.0°F (1985) | 0.40 in (1941) |
| August 12 | 102.9°F (2015) | 44.1°F (1966) | 0.43 in (1965) |
| August 13 | 106.0°F (2015) | 46.0°F (1995) | 1.61 in (1979) |
| August 14 | 105.1°F (1994) | 45.0°F (1985) | 0.65 in (1968) |
| August 15 | 104.0°F (2023) | 46.0°F (1987) | 0.24 in (1976) |
| August 16 | 105.1°F (2023) | 44.1°F (1960) | 0.23 in (1976) |
| August 17 | 102.9°F (2022) | 39.9°F (1978) | 0.40 in (1968) |
| August 18 | 102.9°F (2008) | 37.9°F (1995) | 0.18 in (1968) |
| August 19 | 105.1°F (1946) | 42.1°F (1980) | 0.27 in (1968) |
| August 20 | 102.9°F (1967) | 46.0°F (1984) | 0.40 in (1959) |
| August 21 | 100.9°F (2005) | 44.1°F (1988) | 0.37 in (2023) |
| August 22 | 100.9°F (1950) | 45.0°F (1988) | 0.89 in (2023) |
| August 23 | 107.1°F (1969) | 43.0°F (1960) | 0.28 in (1975) |
| August 24 | 102.0°F (1966) | 34.0°F (1992) | 0.54 in (1977) |
| August 25 | 99.0°F (1958) | 34.0°F (1992) | 0.19 in (1961) |
| August 26 | 104.0°F (1996) | 39.0°F (1993) | 1.46 in (2023) |
| August 27 | 100.9°F (2009) | 37.9°F (1960) | 0.48 in (2025) |
| August 28 | 102.0°F (2009) | 39.0°F (1960) | 0.00 in (1940) |
| August 29 | 99.0°F (2017) | 37.0°F (1980) | 0.16 in (1971) |
| August 30 | 105.1°F (1955) | 37.0°F (1965) | 0.50 in (1984) |
| August 31 | 106.0°F (2022) | 42.1°F (1943) | 0.46 in (1964) |