Climate ▸Forecast ▸December ▸January ▸
JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Romeoville (IL) Weather and Climate: A Comprehensive Guide

The temperature in Romeoville can vary quite a bit throughout the year. Temperatures can be warm during the warmest months, and very cold during 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

Visitors to Romeoville can expect significant temperature changes throughout the year. 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

Romeoville is known for its substantial rain/snowfall, with annual precipitation reaching 1055 mm. Romeoville can be quite wet during June, receiving approximately 130 mm of precipitation over 14 rainy days.

In contrast January, experiences much drier conditions, with 52 mm of snowfall, spread across 10 snowy days. For more details, please visit our Romeoville Precipitation page.

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

Sunshine over the year

Romeoville 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 (40 KM, 25 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (40 KM, 25 Miles).

Forecast for Romeoville (IL)

Wed   Dec 25
4°C | 0°C
E 4 m/s
overcast and no rain

overcast and no rain

Thu   Dec 26
9°C | 2°C
SE 5 m/s
broken clouds and no rain

broken clouds and no rain

Fri   Dec 27
10°C | 5°C
SE 6 m/s
2.3 mm
overcast and rain

overcast and rain

The best time of year to visit Romeoville 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 Romeoville?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Romeoville?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Romeoville?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Romeoville?
    The coldest month is January with an average maximum temperature of -0°C.
  • Which is the wettest month in Romeoville?
    June tops the wettest month list with 130 mm of rainfall.
  • Which is the driest month in Romeoville?
    January is the driest month with 52 mm of precipitation.
  • Which is the sunniest month in Romeoville?
    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.