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Saint Charles has four distinct seasons. Thirty-year average temperatures recorded at Lambert–St. Louis International Airport include an average high temperature of 90 °F in July and an average low temperature of 21 °F in January.  The highest temperature ever recorded in Saint Louis metro was 115 °F, in 1954, while the lowest temperature on record is −23 °F, in 1873.

Winter is the driest season, averaging about 6 inches of total precipitation. Springtime, March through May, is typically the wettest season, with just under 10.5 inches. Dry spells of one or two weeks duration are common during the growing seasons, but the area receives an average of 38.75 inches of rain each year.

You're sure to find beautiful weather year round for any event in Saint Charles.