Saint Charles (IL) Weather and Climate: A Comprehensive Guide
The climate in Saint Charles is marked by big temperature swings throughout the year.
Temperatures range from warm during the warmest months
to very cold in the cooler months.
It also has a relatively rain/snowy climate with high levels of precipitation.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
In Saint Charles, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 29°C in July to a very cold -1°C in January.
Nighttime temperatures can drop, with average lows reaching -10°C in January. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Saint Charles experiences significant rain/snowfall throughout the year, averaging 1022 mm of precipitation annually. The seasons in Saint Charles, bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 120 mm of precipitation. This rainfall is distributed across 13 rainy days. In contrast, the driest month, January, experiences much less snowfall, totaling 47 mm over 10 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Saint 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
In Saint Charles, summer days are longer and more sunny, with daily sunshine hours peaking at 10.6 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average 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 Saint Charles.
The city experiences its highest humidity in December, reaching 76%. In May, the humidity drops to its lowest level at 64%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
overcast and no rain broken clouds and chance of slight rain overcast and rainForecast for Saint Charles (IL)
3 m/s
4 m/s
5 m/s
The best time of year to visit Saint Charles in the United States of America
During the months of May and September 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:
The hottest season / summer takes place in June, July, August and September.
The coldest season / winter is in the following months: January, February and December.
July has an average maximum temperature of 29°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of -1°C.
June tops the wettest month list with 120 mm of rainfall.
January is the driest month with 47 mm of precipitation.
July is the sunniest month with an average of 319 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.
