Des Moines Weather in August
Average highs run from 85°F on August 1 to 81°F on August 31, and lows from 66°F to 61°F. Normal precipitation for the month is 4.17 in over about 9 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
- 84°F
- Average low
- 64°F
- Precipitation
- 4.17 in
- Record high
- 108°FAug 16, 1983
- Record low
- 40°FAug 20, 1950
- Chance of a freeze
- 0%
- Days of 90°F or more
- 5.8
- Daylight
- 14 h 23 min to 13 h 09 min
- Cloud cover
- 51%
- Humidity
- 70%
- Dew point
- 62°F
- Wind
- 8.1 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 | 85°F | 66°F | 101°F 1987 | 55°F 1968 | 31% | 0% |
| Aug 2 | 85°F | 66°F | 100°F 1964 | 53°F 1950 | 31% | 0% |
| Aug 3 | 85°F | 66°F | 102°F 1947 | 54°F 1986 | 31% | 0% |
| Aug 4 | 85°F | 66°F | 102°F 1954 | 51°F 1978 | 31% | 0% |
| Aug 5 | 85°F | 66°F | 100°F 1947 | 51°F 1957 | 31% | 0% |
| Aug 6 | 85°F | 66°F | 99°F 2022 | 53°F 1989 | 31% | 0% |
| Aug 7 | 85°F | 66°F | 100°F 1988 | 48°F 1989 | 31% | 0% |
| Aug 8 | 85°F | 66°F | 97°F 1988 | 53°F 1976 | 31% | 0% |
| Aug 9 | 85°F | 66°F | 100°F 1947 | 50°F 1972 | 31% | 0% |
| Aug 10 | 84°F | 65°F | 101°F 1983 | 52°F 1967 | 31% | 0% |
| Aug 11 | 84°F | 65°F | 98°F 1947 | 50°F 1986 | 31% | 0% |
| Aug 12 | 84°F | 65°F | 99°F 1975 | 48°F 1964 | 31% | 0% |
| Aug 13 | 84°F | 65°F | 99°F 1965 | 48°F 1964 | 30% | 0% |
| Aug 14 | 84°F | 65°F | 104°F 1988 | 51°F 1994 | 30% | 0% |
| Aug 15 | 84°F | 65°F | 104°F 1988 | 50°F 1992 | 30% | 0% |
| Aug 16 | 84°F | 65°F | 108°F 1983 | 52°F 1992 | 30% | 0% |
| Aug 17 | 84°F | 64°F | 104°F 1988 | 52°F 2012 | 30% | 0% |
| Aug 18 | 84°F | 64°F | 104°F 1983 | 50°F 1977 | 30% | 0% |
| Aug 19 | 83°F | 64°F | 101°F 1983 | 49°F 1950 | 30% | 0% |
| Aug 20 | 83°F | 64°F | 100°F 1947 | 40°F 1950 | 29% | 0% |
| Aug 21 | 83°F | 64°F | 99°F 1947 | 47°F 1950 | 29% | 0% |
| Aug 22 | 83°F | 63°F | 98°F 1947 | 52°F 1951 | 29% | 0% |
| Aug 23 | 83°F | 63°F | 100°F 2023 | 48°F 1966 | 29% | 0% |
| Aug 24 | 83°F | 63°F | 100°F 2003 | 50°F 1966 | 29% | 0% |
| Aug 25 | 83°F | 63°F | 101°F 1983 | 45°F 1958 | 29% | 0% |
| Aug 26 | 82°F | 62°F | 104°F 1983 | 47°F 2025 | 29% | 0% |
| Aug 27 | 82°F | 62°F | 99°F 1955 | 45°F 1986 | 29% | 0% |
| Aug 28 | 82°F | 62°F | 100°F 1984 | 41°F 1986 | 29% | 0% |
| Aug 29 | 82°F | 62°F | 99°F 1983 | 43°F 1946 | 29% | 0% |
| Aug 30 | 82°F | 61°F | 104°F 2013 | 49°F 1946 | 29% | 0% |
| Aug 31 | 81°F | 61°F | 97°F 2000 | 45°F 1967 | 29% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- August 1
- sunrise 6:09 AM, sunset 8:32 PM
- August 31
- sunrise 6:40 AM, sunset 7:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00014933 (Des Moines Intl AP), public domain. Records: NOAA GHCN-Daily, station USW00014933, 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.