Collegeville, MN weather for July, based on previous years Collegeville, MN (56321) Weather Facts The average warmest month is July. The highest recorded temperature was 103°F in 1988. On average, the coolest month is January. The lowest recorded temperature was -37°F in 1996. June is the average wettest month. Weather Averages based on previous years in Collegeville, MN for JULY Month Avg. High Avg. Low Mean Avg. Precip Record High Record Low July 83°F 62°F 73°F 3.62 in. 103°F (1988) 41°F (1969) Share this:TwitterMorePrintFacebookPinterestLike this:Like Loading...