August weather in Riley, IN
The average temperature in Riley in August is 73.6°F (62.5°F–84.6°F). Average precipitation: 2.99 inches.
August is a summer month in Riley, and is warmer than the annual average of 53.5°F. Daily temperatures swing about 22.1°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 33m. For travel, August is a comfortable month to visit.
Avg High
84.6°F
Avg Low
62.5°F
Precipitation
2.99 in
Daylight
13h 33m
August records in Riley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 96.1°F (2012) | 55.0°F (2023) | 0.70 in (2024) |
| August 2 | 100.0°F (2012) | 53.1°F (2021) | 1.12 in (2000) |
| August 3 | 93.9°F (2002) | 55.9°F (2009) | 0.61 in (2020) |
| August 4 | 99.0°F (2012) | 53.1°F (2013) | 1.05 in (2022) |
| August 5 | 93.0°F (2024) | 52.0°F (2017) | 1.14 in (1998) |
| August 6 | 93.9°F (2024) | 53.1°F (2004) | 0.48 in (2015) |
| August 7 | 98.1°F (2012) | 48.0°F (2004) | 1.79 in (2018) |
| August 8 | 100.0°F (2012) | 51.1°F (2004) | 1.01 in (2013) |
| August 9 | 93.9°F (2010) | 52.0°F (2017) | 0.64 in (2022) |
| August 10 | 95.0°F (2010) | 55.0°F (1999) | 0.28 in (2020) |
| August 11 | 95.0°F (2010) | 50.0°F (2004) | 0.23 in (2022) |
| August 12 | 93.9°F (2010) | 43.0°F (2004) | 0.54 in (2005) |
| August 13 | 93.0°F (2010) | 50.0°F (2004) | 1.02 in (2005) |
| August 14 | 90.0°F (2010) | 46.0°F (2004) | 1.07 in (2023) |
| August 15 | 93.0°F (2010) | 46.0°F (2004) | 2.29 in (2016) |
| August 16 | 93.0°F (2025) | 46.0°F (2004) | 2.34 in (2012) |
| August 17 | 91.9°F (2000) | 51.1°F (2004) | 1.61 in (2019) |
| August 18 | 91.0°F (2025) | 52.0°F (2023) | 1.72 in (2001) |
| August 19 | 91.9°F (2025) | 52.0°F (2008) | 1.74 in (2009) |
| August 20 | 91.0°F (2010) | 51.1°F (2012) | 1.14 in (2004) |
| August 21 | 93.9°F (2023) | 48.9°F (2015) | 0.55 in (2022) |
| August 22 | 96.1°F (2007) | 46.9°F (2024) | 0.35 in (2017) |
| August 23 | 97.0°F (2007) | 50.0°F (2024) | 1.16 in (2014) |
| August 24 | 96.1°F (2007) | 51.1°F (2009) | 0.81 in (2007) |
| August 25 | 97.0°F (2023) | 46.9°F (2015) | 1.17 in (2018) |
| August 26 | 95.0°F (2024) | 46.0°F (2025) | 1.40 in (2004) |
| August 27 | 97.0°F (2024) | 48.0°F (2010) | 1.31 in (2012) |
| August 28 | 93.9°F (2007) | 51.1°F (2010) | 0.50 in (2022) |
| August 29 | 95.0°F (2007) | 53.1°F (2023) | 1.25 in (2022) |
| August 30 | 97.0°F (2024) | 50.0°F (2009) | 0.72 in (2021) |
| August 31 | 96.1°F (2013) | 50.0°F (2009) | 2.71 in (2003) |