January weather in South Jacksonville, IL
The average temperature in South Jacksonville in January is 26.4°F (17.6°F–35.3°F). Average precipitation: 2.21 inches.
January is a winter month in South Jacksonville, and is cooler than the annual average of 52.8°F. Daily temperatures swing about 17.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 29m. For travel, January is cold.
Avg High
35.3°F
Avg Low
17.6°F
Precipitation
2.21 in
Daylight
9h 29m
January records in South Jacksonville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 63.0°F (2011) | -11.9°F (2018) | 0.94 in (2019) |
| January 2 | 55.0°F (2023) | -11.9°F (2018) | 1.25 in (1951) |
| January 3 | 57.9°F (2023) | -9.0°F (2018) | 0.95 in (1950) |
| January 4 | 66.0°F (2023) | -4.0°F (2014) | 0.73 in (2005) |
| January 5 | 54.0°F (2019) | -2.9°F (2018) | 1.15 in (2005) |
| January 6 | 60.1°F (2012) | -11.0°F (2014) | 0.53 in (2025) |
| January 7 | 66.9°F (2008) | -11.0°F (2014) | 0.26 in (2010) |
| January 8 | 70.0°F (2008) | -11.0°F (2014) | 3.40 in (2008) |
| January 9 | 63.0°F (2026) | -4.0°F (2010) | 0.78 in (2026) |
| January 10 | 55.0°F (2020) | -7.1°F (2010) | 0.91 in (1949) |
| January 11 | 59.0°F (2017) | -6.0°F (2010) | 2.40 in (2020) |
| January 12 | 59.0°F (2013) | 10.0°F (2018) | 0.95 in (2019) |
| January 13 | 55.0°F (2022) | 3.0°F (2011) | 1.64 in (2005) |
| January 14 | 55.0°F (2026) | -11.0°F (2024) | 0.35 in (1951) |
| January 15 | 54.0°F (2016) | -11.9°F (2024) | 0.74 in (2007) |
| January 16 | 50.0°F (2020) | -9.0°F (2024) | 0.14 in (2021) |
| January 17 | 63.0°F (2012) | -4.0°F (2018) | 0.50 in (2012) |
| January 18 | 54.0°F (2015) | -0.9°F (2016) | 1.37 in (2020) |
| January 19 | 48.9°F (2013) | -0.9°F (2016) | 0.83 in (2023) |
| January 20 | 57.0°F (2013) | -4.0°F (2024) | 0.31 in (2016) |
| January 21 | 48.9°F (2017) | -6.0°F (2024) | 0.61 in (2006) |
| January 22 | 63.0°F (2017) | -6.0°F (2025) | 0.78 in (2018) |
| January 23 | 59.0°F (2018) | -2.0°F (2014) | 0.92 in (2024) |
| January 24 | 46.9°F (2010) | -2.9°F (2026) | 0.92 in (2010) |
| January 25 | 51.1°F (2015) | -2.9°F (2026) | 0.38 in (1950) |
| January 26 | 57.9°F (2018) | -5.1°F (2026) | 0.68 in (2024) |
| January 27 | 55.9°F (2018) | -5.1°F (2026) | 1.10 in (1949) |
| January 28 | 55.9°F (2008) | -4.0°F (2014) | 0.24 in (2013) |
| January 29 | 66.9°F (2013) | -2.9°F (2014) | 1.09 in (2006) |
| January 30 | 64.9°F (2008) | -13.0°F (2019) | 1.77 in (2013) |
| January 31 | 63.0°F (2012) | -13.0°F (2019) | 0.70 in (2021) |