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Lemont (IL) Weather and Climate: A Comprehensive Guide

The climate in Lemont is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to very cold in the cooler months. It also experiences much rain/snowfall throughout the year. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

In Lemont, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 29°C in July. In January, the coolest month of the year, temperatures drop to a very cold -0°C.

At night, you can expect cooler temperatures, with averages dropping to around -9°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Lemont experiences significant rain/snowfall throughout the year, averaging 1054 mm of precipitation annually. Lemont can be quite wet during June, receiving approximately 129 mm of precipitation over 15 rainy days.

In contrast January, experiences much drier conditions, with 54 mm of snowfall, spread across 11 snowy days. For more details, please visit our Lemont Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Lemont can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 3.6 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Chicago, the United States of America (35 KM, 22 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (35 KM, 22 Miles).

Forecast for Lemont (IL)

Mon   Dec 23
5°C | -1°C
S 7 m/s
broken clouds and no rain

broken clouds and no rain

Tue   Dec 24
4°C | -1°C
NE 3 m/s
overcast and no rain

overcast and no rain

Wed   Dec 25
4°C | -1°C
NE 4 m/s
overcast and no rain

overcast and no rain

The best time of year to visit Lemont in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Lemont?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Lemont?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Lemont?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Lemont?
    The coldest month is January with an average maximum temperature of -0°C.
  • Which is the wettest month in Lemont?
    June tops the wettest month list with 129 mm of rainfall.
  • Which is the driest month in Lemont?
    January is the driest month with 54 mm of precipitation.
  • Which is the sunniest month in Lemont?
    July is the sunniest month with an average of 319 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.