September weather in Royal, IA
The average temperature in Royal in September is 63.0°F (50.2°F–75.8°F). Average precipitation: 3.21 inches.
September is a fall month in Royal, and is warmer than the annual average of 46.8°F. Daily temperatures swing about 25.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
75.8°F
Avg Low
50.2°F
Precipitation
3.21 in
Daylight
12h 17m
September records in Royal
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2022) | 39.9°F (2009) | 0.10 in (2017) |
| September 2 | 98.1°F (2023) | 44.1°F (2024) | 1.07 in (2021) |
| September 3 | 96.1°F (2023) | 39.9°F (2006) | 0.59 in (2018) |
| September 4 | 98.1°F (2023) | 37.0°F (2025) | 1.06 in (2018) |
| September 5 | 91.0°F (2015) | 39.0°F (2025) | 1.63 in (2016) |
| September 6 | 96.1°F (2020) | 34.0°F (2025) | 0.51 in (2007) |
| September 7 | 93.9°F (2013) | 34.0°F (2025) | 0.72 in (2016) |
| September 8 | 91.9°F (2002) | 37.9°F (2010) | 1.33 in (2015) |
| September 9 | 96.1°F (2013) | 37.0°F (2008) | 0.81 in (2016) |
| September 10 | 91.9°F (2005) | 39.0°F (1999) | 0.79 in (2010) |
| September 11 | 93.9°F (2012) | 37.0°F (2007) | 1.14 in (2019) |
| September 12 | 93.9°F (1998) | 34.0°F (2014) | 1.50 in (2019) |
| September 13 | 95.0°F (2025) | 32.0°F (2014) | 0.51 in (2004) |
| September 14 | 91.0°F (2022) | 31.1°F (2011) | 5.50 in (2004) |
| September 15 | 91.9°F (2018) | 28.2°F (2007) | 2.40 in (2016) |
| September 16 | 93.0°F (2025) | 34.0°F (1999) | 0.66 in (2001) |
| September 17 | 91.9°F (2007) | 37.9°F (2012) | 2.67 in (2004) |
| September 18 | 91.0°F (2013) | 31.1°F (2012) | 1.32 in (2017) |
| September 19 | 93.9°F (1998) | 31.1°F (2006) | 3.04 in (2018) |
| September 20 | 100.9°F (2022) | 27.1°F (2006) | 3.39 in (2018) |
| September 21 | 93.9°F (2005) | 24.1°F (1999) | 2.11 in (2004) |
| September 22 | 93.9°F (2017) | 30.2°F (2012) | 1.13 in (2010) |
| September 23 | 89.1°F (2017) | 22.1°F (2012) | 1.33 in (2010) |
| September 24 | 89.1°F (2017) | 28.9°F (2001) | 0.90 in (2007) |
| September 25 | 89.1°F (2020) | 27.0°F (2000) | 2.16 in (2005) |
| September 26 | 91.0°F (2021) | 29.1°F (2012) | 0.16 in (2003) |
| September 27 | 90.0°F (2013) | 29.1°F (2012) | 0.07 in (2013) |
| September 28 | 89.1°F (2024) | 27.1°F (2022) | 0.42 in (1998) |
| September 29 | 95.0°F (2023) | 25.0°F (1999) | 0.47 in (2007) |
| September 30 | 96.1°F (2023) | 27.0°F (2003) | 2.29 in (2021) |