April weather in O'Fallon, IL
The average temperature in O'Fallon in April is 58.3°F (46.0°F–70.6°F). Average precipitation: 4.90 inches.
April is a spring month in O'Fallon, and is warmer than the annual average of 57.7°F. Daily temperatures swing about 24.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 1m. For travel, April is a comfortable month to visit.
Avg High
70.6°F
Avg Low
46.0°F
Precipitation
4.90 in
Daylight
13h 1m
April records in O'Fallon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| April 1 | 89.1°F (2012) | 21.9°F (1954) | 1.12 in (2008) |
| April 2 | 89.1°F (2012) | 24.1°F (2021) | 1.45 in (2024) |
| April 3 | 88.0°F (2012) | 23.0°F (1987) | 2.48 in (1957) |
| April 4 | 84.0°F (2011) | 23.0°F (1987) | 1.95 in (1952) |
| April 5 | 88.0°F (1988) | 24.1°F (1970) | 1.74 in (1964) |
| April 6 | 84.9°F (1988) | 23.0°F (1982) | 0.88 in (2023) |
| April 7 | 84.9°F (1954) | 19.0°F (1971) | 0.85 in (2000) |
| April 8 | 84.9°F (1965) | 18.0°F (2007) | 1.25 in (1974) |
| April 9 | 88.0°F (1967) | 21.9°F (1997) | 0.67 in (1961) |
| April 10 | 87.1°F (1967) | 25.0°F (1982) | 2.30 in (2008) |
| April 11 | 84.9°F (1965) | 21.9°F (1989) | 1.74 in (1979) |
| April 12 | 87.1°F (1965) | 25.0°F (1990) | 2.94 in (1952) |
| April 13 | 86.0°F (1972) | 25.0°F (1989) | 1.12 in (1983) |
| April 14 | 91.0°F (2006) | 26.1°F (1989) | 2.00 in (1991) |
| April 15 | 91.0°F (2006) | 28.9°F (1962) | 1.74 in (1954) |
| April 16 | 88.0°F (1955) | 28.0°F (2020) | 2.35 in (1972) |
| April 17 | 88.0°F (2006) | 27.0°F (1983) | 0.92 in (1992) |
| April 18 | 89.1°F (2002) | 28.0°F (2001) | 4.50 in (2013) |
| April 19 | 87.1°F (1994) | 25.0°F (1983) | 1.98 in (1970) |
| April 20 | 87.1°F (2017) | 26.1°F (1983) | 1.10 in (1972) |
| April 21 | 87.1°F (1965) | 28.0°F (1982) | 1.69 in (1984) |
| April 22 | 88.0°F (1980) | 28.9°F (1978) | 2.40 in (1996) |
| April 23 | 90.0°F (1965) | 28.9°F (1956) | 1.45 in (1975) |
| April 24 | 87.1°F (1965) | 28.0°F (2023) | 1.58 in (1965) |
| April 25 | 90.0°F (1989) | 30.9°F (1968) | 1.33 in (2020) |
| April 26 | 90.0°F (1989) | 32.0°F (1976) | 1.47 in (1957) |
| April 27 | 89.1°F (1989) | 34.0°F (1967) | 1.38 in (2011) |
| April 28 | 88.0°F (1951) | 28.0°F (1997) | 2.80 in (1994) |
| April 29 | 90.0°F (1987) | 30.9°F (1969) | 4.58 in (1996) |
| April 30 | 91.0°F (2007) | 33.1°F (1969) | 3.38 in (2017) |