August weather in Lake Oswego, OR
The average temperature in Lake Oswego in August is 70.8°F (57.5°F–84.1°F). Average precipitation: 0.56 inches.
August is a summer month in Lake Oswego, and is warmer than the annual average of 55.4°F. Daily temperatures swing about 26.6°F between overnight low and afternoon high. Daylight averages about 13h 55m. For travel, August is a comfortable month to visit.
Avg High
84.1°F
Avg Low
57.5°F
Precipitation
0.56 in
Daylight
13h 55m
August records in Lake Oswego
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (2015) | 46.0°F (1957) | 0.36 in (1956) |
| August 2 | 102.0°F (2017) | 46.9°F (1957) | 0.35 in (1956) |
| August 3 | 102.0°F (1952) | 44.1°F (2019) | 0.83 in (1962) |
| August 4 | 102.0°F (2012) | 45.0°F (1950) | 0.25 in (2004) |
| August 5 | 99.0°F (2012) | 45.0°F (1948) | 0.02 in (1961) |
| August 6 | 100.9°F (1972) | 41.0°F (2019) | 0.29 in (1992) |
| August 7 | 104.0°F (1981) | 46.9°F (1988) | 0.72 in (1976) |
| August 8 | 107.1°F (1981) | 43.0°F (2021) | 0.67 in (1912) |
| August 9 | 104.0°F (1981) | 45.0°F (1954) | 0.58 in (1912) |
| August 10 | 107.1°F (1981) | 48.0°F (1949) | 0.11 in (1965) |
| August 11 | 104.0°F (1977) | 48.9°F (1954) | 0.50 in (1922) |
| August 12 | 106.0°F (1977) | 41.0°F (2007) | 0.54 in (2009) |
| August 13 | 102.9°F (2002) | 41.0°F (2019) | 0.56 in (1922) |
| August 14 | 105.1°F (2023) | 44.1°F (1949) | 0.33 in (1968) |
| August 15 | 105.1°F (2023) | 46.0°F (1955) | 0.66 in (1976) |
| August 16 | 102.0°F (1977) | 44.1°F (2019) | 0.91 in (1912) |
| August 17 | 106.0°F (1977) | 44.1°F (1970) | 1.08 in (1912) |
| August 18 | 97.0°F (2016) | 42.1°F (1973) | 0.58 in (1968) |
| August 19 | 98.1°F (2009) | 44.1°F (1973) | 0.95 in (1954) |
| August 20 | 98.1°F (1951) | 46.0°F (1973) | 0.75 in (2008) |
| August 21 | 98.1°F (1951) | 46.0°F (1955) | 0.32 in (1972) |
| August 22 | 99.0°F (2016) | 43.0°F (1973) | 1.20 in (2004) |
| August 23 | 102.9°F (1988) | 36.0°F (2019) | 1.16 in (1968) |
| August 24 | 100.9°F (1958) | 32.0°F (2019) | 1.16 in (1977) |
| August 25 | 99.0°F (2025) | 36.0°F (2019) | 2.43 in (1956) |
| August 26 | 93.9°F (1992) | 44.1°F (1957) | 0.88 in (1953) |
| August 27 | 97.0°F (1972) | 43.0°F (1955) | 0.48 in (1968) |
| August 28 | 102.0°F (1967) | 42.1°F (2019) | 0.55 in (1912) |
| August 29 | 100.0°F (1967) | 41.0°F (1951) | 1.37 in (1983) |
| August 30 | 98.1°F (1987) | 46.9°F (1951) | 0.95 in (1975) |
| August 31 | 100.9°F (1987) | 45.0°F (1966) | 0.85 in (1922) |