Cool
Average highs are around 19°C, so pack for cooler days.
April verdict
O'Fallon, Illinois, United States in April
Weather score44Mixed
Mixed for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 7.5h per day, enough for a balanced month. Rainfall averages 98mm, so some wet days are possible.
April weather
Monthly averages
Temp
19°C
Rain
98mm
Sun
7.5h
Weather score
44
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 98mm, so some wet days are possible.
Some sun
Sunshine averages 7.5h per day, enough for a balanced month.
Map
Weather map
Compare O'Fallon, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
April19°C average high
April is close to O'Fallon's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
April98mm average rain
April 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
April7.5 hours average sun
April sits close to O'Fallon's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
April44 weather score
April scores below O'Fallon's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
