Sun Valley Weather in August
Average highs run from 91°F on August 1 to 89°F on August 31, and lows from 61°F to 57°F. Normal precipitation for the month is 2.60 in over about 11 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
- 91°F
- Average low
- 59°F
- Precipitation
- 2.60 in
- Record high
- 104°FAug 1, 1993
- Record low
- 37°FAug 31, 1956
- Chance of a freeze
- 0%
- Days of 90°F or more
- 18.0
- Daylight
- 13 h 50 min to 12 h 54 min
- Cloud cover
- 49%
- Humidity
- 55%
- Dew point
- 50°F
- Wind
- 4.3 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 | 91°F | 61°F | 104°F 1993 | 51°F 1976 | 36% | 0% |
| Aug 2 | 91°F | 61°F | 101°F 1960 | 47°F 1956 | 36% | 0% |
| Aug 3 | 91°F | 61°F | 102°F 1994 | 42°F 1956 | 36% | 0% |
| Aug 4 | 91°F | 61°F | 101°F 1975 | 43°F 1956 | 36% | 0% |
| Aug 5 | 91°F | 61°F | 100°F 1969 | 43°F 1976 | 36% | 0% |
| Aug 6 | 91°F | 61°F | 102°F 1995 | 47°F 1956 | 36% | 0% |
| Aug 7 | 91°F | 60°F | 102°F 1995 | 49°F 1956 | 36% | 0% |
| Aug 8 | 91°F | 60°F | 101°F 1995 | 43°F 1956 | 36% | 0% |
| Aug 9 | 91°F | 60°F | 101°F 1995 | 46°F 1956 | 36% | 0% |
| Aug 10 | 91°F | 60°F | 100°F 1995 | 50°F 1974 | 36% | 0% |
| Aug 11 | 91°F | 60°F | 100°F 1962 | 50°F 1956 | 36% | 0% |
| Aug 12 | 91°F | 60°F | 102°F 1996 | 47°F 1974 | 36% | 0% |
| Aug 13 | 91°F | 60°F | 102°F 1996 | 47°F 1974 | 36% | 0% |
| Aug 14 | 91°F | 60°F | 100°F 1962 | 46°F 1976 | 35% | 0% |
| Aug 15 | 91°F | 60°F | 102°F 1962 | 42°F 1968 | 35% | 0% |
| Aug 16 | 91°F | 59°F | 101°F 1962 | 45°F 1968 | 35% | 0% |
| Aug 17 | 91°F | 59°F | 99°F 1989 | 48°F 1980 | 35% | 0% |
| Aug 18 | 91°F | 59°F | 99°F 1989 | 46°F 1975 | 34% | 0% |
| Aug 19 | 90°F | 59°F | 98°F 2020 | 42°F 1956 | 34% | 0% |
| Aug 20 | 90°F | 59°F | 100°F 1997 | 44°F 1956 | 34% | 0% |
| Aug 21 | 90°F | 59°F | 98°F 1991 | 45°F 1956 | 33% | 0% |
| Aug 22 | 90°F | 59°F | 98°F 1998 | 44°F 1956 | 33% | 0% |
| Aug 23 | 90°F | 58°F | 100°F 1985 | 42°F 1956 | 33% | 0% |
| Aug 24 | 90°F | 58°F | 102°F 1985 | 40°F 1990 | 32% | 0% |
| Aug 25 | 90°F | 58°F | 101°F 1985 | 45°F 1989 | 32% | 0% |
| Aug 26 | 90°F | 58°F | 97°F 1981 | 46°F 1989 | 31% | 0% |
| Aug 27 | 90°F | 58°F | 99°F 1974 | 40°F 2004 | 31% | 0% |
| Aug 28 | 90°F | 57°F | 103°F 1998 | 40°F 1956 | 30% | 0% |
| Aug 29 | 90°F | 57°F | 99°F 2026 | 43°F 1956 | 30% | 0% |
| Aug 30 | 90°F | 57°F | 100°F 1950 | 39°F 1956 | 29% | 0% |
| Aug 31 | 89°F | 57°F | 102°F 1950 | 37°F 1956 | 29% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- August 1
- sunrise 5:36 AM, sunset 7:26 PM
- August 31
- sunrise 5:58 AM, sunset 6:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093139 (Payson), public domain. Records: NOAA GHCN-Daily, station USW00093139, 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.