May weather in Monmouth, IL
The average temperature in Monmouth in May is 61.9°F (50.9°F–72.9°F). Average precipitation: 5.18 inches.
May is a spring month in Monmouth, and is warmer than the annual average of 50.6°F. Daily temperatures swing about 22°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 17m. For travel, May is a wet month.
Avg High
72.9°F
Avg Low
50.9°F
Precipitation
5.18 in
Daylight
14h 17m
May records in Monmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 90.0°F (1952) | 26.1°F (1903) | 1.64 in (2019) |
| May 2 | 89.1°F (1901) | 28.9°F (1911) | 1.99 in (1910) |
| May 3 | 90.0°F (1928) | 25.0°F (2005) | 1.47 in (1946) |
| May 4 | 91.9°F (1952) | 27.0°F (1907) | 2.83 in (1990) |
| May 5 | 93.0°F (1909) | 30.0°F (1910) | 2.25 in (2003) |
| May 6 | 90.0°F (1934) | 28.9°F (1989) | 1.60 in (1976) |
| May 7 | 89.1°F (1896) | 28.9°F (1989) | 2.12 in (1945) |
| May 8 | 90.0°F (1896) | 33.1°F (1923) | 2.07 in (1995) |
| May 9 | 91.0°F (1963) | 30.0°F (1966) | 2.15 in (2021) |
| May 10 | 90.0°F (1963) | 25.0°F (1966) | 1.57 in (2013) |
| May 11 | 91.0°F (1956) | 28.0°F (1907) | 1.87 in (1966) |
| May 12 | 93.9°F (1956) | 33.1°F (1928) | 1.79 in (1920) |
| May 13 | 95.0°F (2022) | 35.1°F (1923) | 2.68 in (1908) |
| May 14 | 93.0°F (2022) | 25.0°F (1895) | 2.41 in (1970) |
| May 15 | 93.0°F (1911) | 34.0°F (1904) | 3.00 in (2009) |
| May 16 | 99.0°F (1983) | 33.1°F (1895) | 1.48 in (1952) |
| May 17 | 93.0°F (1906) | 35.1°F (2009) | 1.98 in (1986) |
| May 18 | 91.0°F (1902) | 33.1°F (2002) | 1.28 in (1896) |
| May 19 | 91.9°F (1962) | 35.1°F (1894) | 1.35 in (1898) |
| May 20 | 91.0°F (1987) | 32.0°F (1894) | 1.90 in (2025) |
| May 21 | 91.9°F (1987) | 32.0°F (2002) | 0.98 in (2001) |
| May 22 | 96.1°F (1925) | 34.0°F (1895) | 1.58 in (1918) |
| May 23 | 93.0°F (1906) | 33.1°F (1963) | 1.10 in (1988) |
| May 24 | 93.0°F (1911) | 36.0°F (1925) | 1.90 in (2002) |
| May 25 | 96.1°F (1911) | 28.9°F (1925) | 1.90 in (1990) |
| May 26 | 96.1°F (1911) | 34.0°F (1925) | 1.95 in (1933) |
| May 27 | 95.0°F (1911) | 35.1°F (1992) | 1.70 in (1996) |
| May 28 | 98.1°F (2018) | 34.0°F (1894) | 2.00 in (1908) |
| May 29 | 98.1°F (1934) | 35.1°F (1952) | 2.71 in (2019) |
| May 30 | 98.1°F (1934) | -49.0°F (1915) | 1.29 in (1967) |
| May 31 | 102.0°F (1934) | 32.0°F (1897) | 2.76 in (1941) |