Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
September verdict
Mount Vernon, Illinois, United States in September
Weather score70Good
Good for holiday weather
Average highs sit around 27°C, giving warm days by monthly-average standards. Sunshine averages 8h per day, so bright days are a strong part of the month. Rainfall averages 83mm, so some wet days are possible.
September weather
Monthly averages
Temp
27°C
Rain
83mm
Sun
8h
Weather score
70
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 83mm, so some wet days are possible.
Bright
Sunshine averages 8h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Mount Vernon, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September27°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
September83mm average rain
September sits near Mount Vernon's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to February, June, and August to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September8 hours average sun
September sits close to Mount Vernon'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
September70 weather score
September scores above Mount Vernon's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
