St. Charles (MO) Weather and Climate: A Comprehensive Guide
The temperature in St. Charles can vary greatly throughout the year.
The temperatures shift from very warm
to cold.
It also has a notably wet climate with much precipitation.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
Depending on the time of the year, temperatures range from very warm to chilly in St. Charles. Average maximum daytime temperatures range from a very warm 31°C in July, the warmest time of the year, to a chilly 5°C during cooler months like January.
At night, temperatures typically drop to an average of around -6°C during these months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
St. Charles has a relatively rain/snowy climate with high precipitation levels, averaging 1114 mm of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, April receives high rainfall, averaging 128 mm of precipitation, recorded across 11 rainy days. In contrast, the drier season, January brings less snow/rainfall, with 45 mm over 7 snowy/rainy days. For more details, please visit our St. Charles Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in St. Charles. While July receives considerable daily sunshine with up to 10.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.3 hours of sunlight per day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in St. Charles.
The city experiences its highest humidity in December, reaching 74%. In April, the humidity drops to its lowest level at 63%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
clear and no rain clear and no rain overcast and chance of slight rainForecast for St. Charles (MO)
3 m/s
6 m/s
5 m/s
The best time of year to visit St. Charles in the United States of America
During the months of May and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
July has an average maximum temperature of 31°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 5°C.
April tops the wettest month list with 128 mm of rainfall.
January is the driest month with 45 mm of precipitation.
July is the sunniest month with an average of 311 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
