Lake Saint Louis is located in Saint Charles County, Missouri. There are roughly 14,090 residents, living in 5,522 households. The average temperature for Lake Saint Louis this time of the year is low of 54F and high of 76F. On average, Lake Saint Louis gets about 4.36 inches of precipitation in May. Most residents are home owners (81%), have a post secondary degree (59%) and are married, no kids (38%).
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