Warm
Average highs sit around 28°C, giving warm days by monthly-average standards.
August verdict
Joliet, Illinois, United States in August
Weather score73Very good
Very good for holiday weather
Average highs sit around 28°C, giving warm days by monthly-average standards. Sunshine averages 9.1h per day, so bright days are a strong part of the month. Rainfall averages 94mm, so some wet days are possible.
August weather
Monthly averages
Temp
28°C
Rain
94mm
Sun
9.1h
Sea
23°C
Weather score
73
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 94mm, so some wet days are possible.
Bright
Sunshine averages 9.1h per day, so bright days are a strong part of the month.
Swimmable
Sea temperatures average 23°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Joliet, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August28°C average high
August is one of Joliet'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
August94mm average rain
August is wetter than Joliet's yearly average, so flexible plans matter more.
Driest monthsJanuary to February, October, and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August9.1 hours average sun
August is brighter than Joliet's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August23°C average sea
August is one of Joliet's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
August73 weather score
August is one of Joliet's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
