Rio Weather in August
Average highs run from 91°F on August 1 to 90°F on August 31, and lows from 76°F to 76°F. Normal precipitation for the month is 8.49 in over about 16 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
- 76°F
- Precipitation
- 8.49 in
- Record high
- 99°FAug 6, 1952
- Record low
- 59°FAug 3, 2008
- Chance of a freeze
- 0%
- Days of 90°F or more
- 21.4
- Daylight
- 13 h 24 min to 12 h 42 min
- Cloud cover
- 59%
- Humidity
- 80%
- Dew point
- 76°F
- Wind
- 7.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 91°F | 76°F | 96°F 1961 | 68°F 1972 | 50% |
| Aug 2 | 91°F | 76°F | 98°F 2010 | 66°F 2008 | 51% |
| Aug 3 | 91°F | 76°F | 98°F 1958 | 59°F 2008 | 51% |
| Aug 4 | 91°F | 76°F | 97°F 1970 | 69°F 1966 | 51% |
| Aug 5 | 91°F | 76°F | 96°F 1943 | 70°F 1936 | 51% |
| Aug 6 | 91°F | 76°F | 99°F 1952 | 67°F 1974 | 51% |
| Aug 7 | 91°F | 76°F | 98°F 1952 | 69°F 1939 | 51% |
| Aug 8 | 91°F | 76°F | 97°F 1963 | 66°F 1972 | 51% |
| Aug 9 | 91°F | 76°F | 99°F 1963 | 69°F 1972 | 51% |
| Aug 10 | 91°F | 76°F | 98°F 1940 | 69°F 1972 | 51% |
| Aug 11 | 91°F | 76°F | 98°F 1940 | 69°F 1972 | 52% |
| Aug 12 | 91°F | 76°F | 97°F 1987 | 70°F 1958 | 52% |
| Aug 13 | 91°F | 76°F | 99°F 1944 | 68°F 1972 | 52% |
| Aug 14 | 91°F | 76°F | 96°F 1952 | 67°F 1972 | 52% |
| Aug 15 | 91°F | 76°F | 97°F 1941 | 67°F 1972 | 52% |
| Aug 16 | 91°F | 76°F | 95°F 1989 | 68°F 1956 | 52% |
| Aug 17 | 91°F | 76°F | 96°F 1941 | 70°F 1956 | 52% |
| Aug 18 | 91°F | 76°F | 98°F 2026 | 61°F 1976 | 53% |
| Aug 19 | 91°F | 76°F | 98°F 1941 | 69°F 1956 | 53% |
| Aug 20 | 91°F | 76°F | 97°F 1940 | 66°F 1970 | 53% |
| Aug 21 | 91°F | 76°F | 99°F 1993 | 68°F 1942 | 53% |
| Aug 22 | 91°F | 76°F | 97°F 1993 | 62°F 1972 | 53% |
| Aug 23 | 90°F | 76°F | 96°F 1960 | 67°F 1982 | 53% |
| Aug 24 | 90°F | 76°F | 97°F 1952 | 67°F 1957 | 53% |
| Aug 25 | 90°F | 76°F | 96°F 1984 | 65°F 1982 | 53% |
| Aug 26 | 90°F | 76°F | 96°F 1984 | 64°F 1982 | 53% |
| Aug 27 | 90°F | 76°F | 96°F 2025 | 63°F 1982 | 53% |
| Aug 28 | 90°F | 76°F | 96°F 1962 | 66°F 1972 | 53% |
| Aug 29 | 90°F | 76°F | 97°F 1962 | 64°F 1972 | 53% |
| Aug 30 | 90°F | 76°F | 96°F 1983 | 69°F 1972 | 53% |
| Aug 31 | 90°F | 76°F | 99°F 1986 | 64°F 1972 | 53% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:45 AM, sunset 8:09 PM
- August 31
- sunrise 7:00 AM, sunset 7:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00088620 (Stuart), public domain. Records: NOAA GHCN-Daily, station USC00088620, 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.