The highest day temperature in July 2025 was 104°F. The lowest night temperature was 73°F. The average values for day and night temperatures during July were 95.7°F и 80.2°F respectivly.

You can expect various weather conditions during July. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in July for Saint Charles is 1.5 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 6.2 mph. It makes July the most windless month of the year for Saint Charles.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Saint Charles in July is 8.8 hours.