Oakbrook Terrace (IL) Temperature by Month

The average annual maximum temperature in Oakbrook Terrace, Illinois, United States of America is 15°C (59°F), with daytime highs ranging from 0°C (32°F) in January to 29°C (84°F) in July. This page covers monthly averages, day-night differences, and how Oakbrook Terrace compares to cities worldwide.

The weather in Oakbrook Terrace experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Oakbrook Terrace by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 319 hours of sunshine.

The chart below shows the average temperature throughout the year:

Oakbrook Terrace's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Oakbrook Terrace, January is the coolest month, with average highs of 0°C (32°F) and humidity around 72%, considered high. In July, the warmest month, temperatures average 29°C (84°F) with 68% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Oakbrook Terrace this rarely lasts long on the ground.

For more on Oakbrook Terrace's weather, including monthly rainfall, sunshine hours, and humidity, visit our Oakbrook Terrace climate page.