Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
Weather Guide
Waukegan, Illinois, United States Average Monthly Weather
Weather score41Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 14°C, sunshine averages 6.7h per day, and rainfall totals about 883mm. Sea temperatures average 10°C across the year.
Annual weather
Annual averages
Temp
14°C
Rain
883mm
Annual total
Sun
6.7h
Sea
10°C
Weather score
41
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 93mm, so some wet days are possible.
Bright
Sunshine averages 9h per day, so bright days are a strong part of the month.
Swimmable
Sea temperatures average 22°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Waukegan, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August27°C average high
August is one of Waukegan's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August93mm average rain
August is one of Waukegan's wettest months, so rain is likely to be a major planning factor.
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 hours average sun
August is brighter than Waukegan'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
August22°C average sea
August is one of Waukegan's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
August71 weather score
August is one of Waukegan's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
