March weather in Alton, IL
The average temperature in Alton in March is 44.1°F (34.7°F–53.5°F). Average precipitation: 3.46 inches.
March is a spring month in Alton, and is cooler than the annual average of 55.7°F. Daily temperatures swing about 18.8°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 11h 44m. For travel, March is cool.
Avg High
53.5°F
Avg Low
34.7°F
Precipitation
3.46 in
Daylight
11h 44m
March records in Alton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 81.0°F (1972) | 3.0°F (1960) | 2.01 in (2017) |
| March 2 | 73.9°F (1976) | 6.1°F (1980) | 0.66 in (1988) |
| March 3 | 84.9°F (1946) | 1.9°F (2014) | 0.85 in (1945) |
| March 4 | 79.0°F (1946) | 1.9°F (2014) | 2.04 in (1976) |
| March 5 | 82.0°F (1946) | -0.9°F (1960) | 1.87 in (2011) |
| March 6 | 82.0°F (1956) | 3.9°F (1960) | 1.40 in (1945) |
| March 7 | 78.1°F (1987) | 12.9°F (2015) | 1.68 in (2022) |
| March 8 | 80.1°F (1974) | 3.9°F (1996) | 1.50 in (1893) |
| March 9 | 79.0°F (1974) | 3.0°F (1996) | 1.18 in (1958) |
| March 10 | 82.0°F (1955) | 12.0°F (1948) | 0.83 in (2006) |
| March 11 | 84.9°F (2026) | 6.1°F (1948) | 1.52 in (1973) |
| March 12 | 81.0°F (1972) | 3.9°F (1948) | 2.93 in (1977) |
| March 13 | 81.0°F (2012) | 9.0°F (1998) | 1.60 in (1961) |
| March 14 | 88.0°F (1946) | 10.9°F (1993) | 0.80 in (1978) |
| March 15 | 81.0°F (2025) | 10.9°F (1993) | 1.09 in (2007) |
| March 16 | 84.0°F (1945) | 17.1°F (2017) | 1.50 in (1893) |
| March 17 | 86.0°F (1946) | 17.1°F (2026) | 0.80 in (2004) |
| March 18 | 78.1°F (2012) | 14.0°F (2026) | 1.90 in (2021) |
| March 19 | 80.1°F (2012) | 10.9°F (1965) | 2.75 in (2008) |
| March 20 | 84.0°F (2026) | 12.9°F (1965) | 1.32 in (2018) |
| March 21 | 84.9°F (2026) | 16.0°F (1951) | 1.84 in (1962) |
| March 22 | 84.9°F (2026) | 18.0°F (2002) | 1.07 in (1948) |
| March 23 | 89.1°F (2026) | 18.0°F (2002) | 1.80 in (2005) |
| March 24 | 93.9°F (1946) | 1.9°F (1974) | 1.58 in (2023) |
| March 25 | 89.1°F (1946) | 8.1°F (1974) | 1.67 in (1978) |
| March 26 | 98.1°F (1946) | 3.9°F (1955) | 1.35 in (1945) |
| March 27 | 102.0°F (1946) | 17.1°F (1955) | 1.50 in (2018) |
| March 28 | 89.1°F (1945) | 25.0°F (1955) | 4.12 in (1977) |
| March 29 | 100.9°F (1946) | 21.9°F (1964) | 1.20 in (2009) |
| March 30 | 84.0°F (1986) | 19.9°F (1964) | 2.08 in (1985) |
| March 31 | 84.9°F (1986) | 23.0°F (1969) | 2.30 in (2022) |