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 67F and high of 89F. On average, Lake Saint Louis gets about 3.9 inches of precipitation in July. Most residents are home owners (81%), have a post secondary degree (59%) and are married, no kids (38%).
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