Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
June verdict
O'Fallon, Illinois, United States in June
Weather score83Very good
Very good for holiday weather
Average highs sit around 29°C, giving warm days by monthly-average standards. Sunshine averages 9.9h per day, so bright days are a strong part of the month. Rainfall averages 94mm, so some wet days are possible.
June weather
Monthly averages
Temp
29°C
Rain
94mm
Sun
9.9h
Weather score
83
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 94mm, so some wet days are possible.
Bright
Sunshine averages 9.9h per day, so bright days are a strong part of the month.
Map
Weather map
Compare O'Fallon, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
June29°C average high
June is one of O'Fallon's warmest months, with daytime heat above the yearly average.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
June94mm average rain
June is wetter than O'Fallon's yearly average, so flexible plans matter more.
Driest monthsJanuary to February and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
June9.9 hours average sun
June is one of O'Fallon's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
June83 weather score
June is one of O'Fallon's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
