Lewiston Weather in August
Average highs run from 97°F on August 1 to 92°F on August 31, and lows from 54°F to 49°F. Normal precipitation for the month is 0.14 in over about 1 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
- 94°F
- Average low
- 52°F
- Precipitation
- 0.14 in
- Record high
- 116°FAug 4, 1932
- Record low
- 29°FAug 27, 1929
- Chance of a freeze
- 0%
- Days of 90°F or more
- 23.0
- Daylight
- 14 h 18 min to 13 h 08 min
- Cloud cover
- 17%
- Humidity
- 36%
- Dew point
- 37°F
- Wind
- 3.6 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 | 97°F | 54°F | 111°F 2017 | 39°F 1929 | 3% | 0% |
| Aug 2 | 96°F | 54°F | 112°F 1932 | 36°F 1929 | 3% | 0% |
| Aug 3 | 96°F | 54°F | 114°F 1932 | 38°F 1929 | 3% | 0% |
| Aug 4 | 96°F | 54°F | 116°F 1932 | 36°F 1929 | 3% | 0% |
| Aug 5 | 96°F | 54°F | 116°F 1932 | 34°F 1929 | 3% | 0% |
| Aug 6 | 96°F | 54°F | 112°F 1932 | 35°F 1918 | 3% | 0% |
| Aug 7 | 96°F | 54°F | 109°F 1981 | 37°F 1918 | 3% | 0% |
| Aug 8 | 96°F | 53°F | 113°F 1981 | 39°F 1918 | 3% | 0% |
| Aug 9 | 96°F | 53°F | 115°F 1981 | 38°F 1924 | 3% | 0% |
| Aug 10 | 95°F | 53°F | 110°F 1971 | 39°F 1947 | 3% | 0% |
| Aug 11 | 95°F | 53°F | 109°F 1971 | 40°F 1944 | 3% | 0% |
| Aug 12 | 95°F | 53°F | 111°F 1933 | 38°F 1938 | 3% | 0% |
| Aug 13 | 95°F | 53°F | 113°F 1933 | 38°F 1945 | 3% | 0% |
| Aug 14 | 95°F | 52°F | 114°F 1933 | 39°F 1929 | 3% | 0% |
| Aug 15 | 95°F | 52°F | 107°F 2002 | 37°F 1954 | 3% | 0% |
| Aug 16 | 94°F | 52°F | 108°F 2002 | 37°F 1912 | 3% | 0% |
| Aug 17 | 94°F | 52°F | 107°F 1919 | 34°F 1972 | 3% | 0% |
| Aug 18 | 94°F | 52°F | 110°F 1937 | 33°F 1916 | 3% | 0% |
| Aug 19 | 94°F | 51°F | 108°F 1919 | 34°F 1940 | 3% | 0% |
| Aug 20 | 94°F | 51°F | 110°F 1919 | 35°F 1918 | 3% | 0% |
| Aug 21 | 94°F | 51°F | 108°F 1919 | 36°F 1929 | 3% | 0% |
| Aug 22 | 94°F | 51°F | 107°F 1919 | 32°F 1947 | 4% | 0% |
| Aug 23 | 93°F | 51°F | 107°F 1928 | 33°F 1929 | 4% | 0% |
| Aug 24 | 93°F | 50°F | 107°F 1916 | 32°F 1925 | 4% | 0% |
| Aug 25 | 93°F | 50°F | 107°F 1916 | 31°F 1925 | 4% | 0% |
| Aug 26 | 93°F | 50°F | 107°F 1924 | 32°F 1929 | 4% | 0% |
| Aug 27 | 93°F | 50°F | 107°F 2019 | 29°F 1929 | 4% | 0% |
| Aug 28 | 93°F | 50°F | 108°F 1988 | 33°F 1929 | 4% | 0% |
| Aug 29 | 93°F | 50°F | 108°F 1988 | 34°F 1929 | 4% | 0% |
| Aug 30 | 92°F | 49°F | 107°F 1918 | 30°F 1925 | 4% | 0% |
| Aug 31 | 92°F | 49°F | 106°F 1987 | 34°F 1929 | 5% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- August 1
- sunrise 6:08 AM, sunset 8:26 PM
- August 31
- sunrise 6:37 AM, sunset 7:45 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00049026 (Trinity Rvr Hatchery), public domain. Records: NOAA GHCN-Daily, station USC00049490, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.