Rio Negro Weather in August
Average highs run from 20°C on August 1 to 23°C on August 31, and lows from 9°C to 11°C. Normal precipitation for the month is 90 mm over about 9 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 22°C
- Average low
- 10°C
- Precipitation
- 90 mm
- Reanalysis high
- 31°CAug 12, 2006
- Reanalysis low
- -3°CAug 3, 1991
- Daylight
- 10 h 55 min to 11 h 34 min
- Cloud cover
- 54%
- Humidity
- 80%
- Dew point
- 11°C
- Wind
- 4.7 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 20°C | 9°C | 25°C 1995 | -2°C 1993 | 27% |
| Aug 2 | 20°C | 9°C | 25°C 1995 | -1°C 1991 | 28% |
| Aug 3 | 20°C | 9°C | 25°C 2013 | -3°C 1991 | 28% |
| Aug 4 | 21°C | 9°C | 25°C 2014 | 0°C 2019 | 27% |
| Aug 5 | 21°C | 9°C | 27°C 2006 | -1°C 2011 | 28% |
| Aug 6 | 21°C | 9°C | 28°C 2006 | 5°C 2010 | 28% |
| Aug 7 | 21°C | 9°C | 29°C 2006 | 6°C 2010 | 28% |
| Aug 8 | 21°C | 9°C | 28°C 2006 | 0°C 2004 | 28% |
| Aug 9 | 21°C | 9°C | 28°C 2006 | 1°C 2004 | 27% |
| Aug 10 | 21°C | 9°C | 25°C 2017 | -1°C 2003 | 27% |
| Aug 11 | 21°C | 9°C | 29°C 2006 | 0°C 1993 | 28% |
| Aug 12 | 21°C | 9°C | 31°C 2006 | -1°C 2000 | 28% |
| Aug 13 | 21°C | 10°C | 28°C 2006 | 4°C 2000 | 28% |
| Aug 14 | 21°C | 10°C | 29°C 2006 | 1°C 2014 | 28% |
| Aug 15 | 21°C | 10°C | 29°C 2006 | -2°C 1999 | 28% |
| Aug 16 | 21°C | 10°C | 27°C 2015 | 1°C 1999 | 27% |
| Aug 17 | 22°C | 10°C | 26°C 2005 | -1°C 2003 | 26% |
| Aug 18 | 22°C | 10°C | 27°C 2015 | 1°C 2003 | 26% |
| Aug 19 | 22°C | 10°C | 27°C 2008 | 4°C 2003 | 27% |
| Aug 20 | 22°C | 10°C | 27°C 2004 | 4°C 2011 | 26% |
| Aug 21 | 22°C | 10°C | 27°C 2003 | 0°C 2011 | 25% |
| Aug 22 | 22°C | 10°C | 27°C 2003 | 1°C 2006 | 26% |
| Aug 23 | 22°C | 10°C | 28°C 2003 | 4°C 2006 | 25% |
| Aug 24 | 23°C | 10°C | 28°C 2000 | 4°C 2006 | 26% |
| Aug 25 | 23°C | 10°C | 28°C 2002 | 2°C 2005 | 26% |
| Aug 26 | 23°C | 10°C | 28°C 2000 | 1°C 2018 | 26% |
| Aug 27 | 23°C | 10°C | 28°C 2010 | 3°C 2013 | 26% |
| Aug 28 | 23°C | 10°C | 29°C 1995 | -1°C 2013 | 26% |
| Aug 29 | 23°C | 11°C | 29°C 1994 | 3°C 2013 | 26% |
| Aug 30 | 23°C | 11°C | 30°C 1994 | 6°C 2008 | 27% |
| Aug 31 | 23°C | 11°C | 31°C 1994 | 5°C 2011 | 28% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- August 1
- sunrise 6:58 AM, sunset 5:53 PM
- August 31
- sunrise 6:33 AM, sunset 6:07 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: 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.