May weather in St. Joseph, IL
The average temperature in St. Joseph in May is 62.9°F (52.4°F–73.3°F). Average precipitation: 4.96 inches.
May is a spring month in St. Joseph, and is warmer than the annual average of 52.2°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 14h 13m. For travel, May is a comfortable month to visit.
Avg High
73.3°F
Avg Low
52.4°F
Precipitation
4.96 in
Daylight
14h 13m
May records in St. Joseph
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 81.0°F (2013) | 36.0°F (2015) | 1.31 in (2017) |
| May 2 | 84.9°F (2018) | 36.0°F (2015) | 1.36 in (2012) |
| May 3 | 89.1°F (2024) | 37.0°F (2023) | 0.51 in (2020) |
| May 4 | 86.0°F (2012) | 36.0°F (2011) | 0.81 in (2017) |
| May 5 | 87.1°F (2024) | 36.0°F (2011) | 1.44 in (2003) |
| May 6 | 84.9°F (2015) | 37.0°F (2011) | 0.60 in (2022) |
| May 7 | 88.0°F (2012) | 37.0°F (2020) | 1.35 in (2023) |
| May 8 | 87.1°F (2014) | 33.1°F (2021) | 1.01 in (2023) |
| May 9 | 89.1°F (2014) | 28.9°F (2020) | 0.72 in (2002) |
| May 10 | 84.0°F (2018) | 28.0°F (2020) | 0.88 in (2013) |
| May 11 | 91.0°F (2022) | 34.0°F (2021) | 0.94 in (2010) |
| May 12 | 93.9°F (2022) | 34.0°F (2021) | 0.62 in (2002) |
| May 13 | 91.9°F (2022) | 34.0°F (2020) | 1.35 in (2002) |
| May 14 | 91.0°F (2022) | 37.9°F (2013) | 1.91 in (2009) |
| May 15 | 90.0°F (2018) | 39.0°F (2021) | 0.64 in (2004) |
| May 16 | 93.0°F (2025) | 39.9°F (2011) | 1.49 in (2009) |
| May 17 | 90.0°F (2025) | 39.0°F (2011) | 0.92 in (2020) |
| May 18 | 84.9°F (2022) | 39.0°F (2014) | 1.30 in (2020) |
| May 19 | 88.0°F (2017) | 41.0°F (2014) | 0.72 in (2018) |
| May 20 | 93.0°F (2024) | 45.0°F (2015) | 0.98 in (2025) |
| May 21 | 91.0°F (2012) | 45.0°F (2015) | 0.99 in (2017) |
| May 22 | 91.9°F (2024) | 45.0°F (2015) | 1.95 in (2014) |
| May 23 | 87.1°F (2011) | 44.1°F (2025) | 0.32 in (2013) |
| May 24 | 88.0°F (2021) | 39.0°F (2013) | 0.50 in (2008) |
| May 25 | 90.0°F (2021) | 39.0°F (2013) | 1.60 in (2024) |
| May 26 | 90.0°F (2021) | 45.0°F (2023) | 1.64 in (2011) |
| May 27 | 91.9°F (2012) | 45.0°F (2023) | 1.28 in (2024) |
| May 28 | 93.9°F (2012) | 46.9°F (2011) | 0.70 in (2002) |
| May 29 | 95.0°F (2018) | 45.0°F (2021) | 1.41 in (2011) |
| May 30 | 89.1°F (2023) | 39.9°F (2021) | 0.25 in (2015) |
| May 31 | 93.0°F (2023) | 39.9°F (2021) | 2.01 in (2015) |