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January Weather in Oak Forest, United States

Last updated: June 24, 2025

In January, the average temperature in Oak Forest, United States hovers around -3°C (27°F), with fluctuations ranging from a frigid -30°C (-23°F) to a mild 16°C (62°F). Expect about 66 mm (2.6 in) of precipitation spread over 8 days, contributing to an average humidity of 82%. Stay warm and prepared for the chilly conditions!

January Temperature in Oak Forest

In January in Oak Forest, the average temperature is -3°C (27°F), with maximums reaching 16°C (62°F) and minimums plunging as low as -30°C (-23°F). Travelers should be prepared for a wide range of temperatures, ensuring they have appropriate clothing for both cold and milder conditions.

January Weather in Oak Forest: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Oak Forest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oak Forest, January typically has an average temperature of -3°C (27°F), with highs reaching up to 16°C (62°F) and lows dropping to around -30°C (-23°F).
JanFebMarAprMayJunJulAugSepOctNovDec272840496172757368554034
Data source: Temperature data for Oak Forest generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Oak Forest

In Oak Forest in January, the total precipitation amount is 66 mm (2.6 in) over the course of 8 days.

January Precipitation Trends in Oak Forest

The chart displays monthly precipitation patterns in Oak Forest, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Oak Forest, January typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec66699612216314311492801396357
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Oak Forest

In Oak Forest in January, humidity is 82%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making traveling uncomfortable and necessitating extra layers to stay warm while navigating through the damp air.

January Average Humidity in Oak Forest

This chart illustrates the average monthly humidity levels in Oak Forest, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Oak Forest is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Oak Forest

In Oak Forest in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Oak Forest, you can check the information here.

Maximum UV Index Levels in Oak Forest for January

The chart shows the monthly maximum UV Index (UVI) for Oak Forest in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Oak Forest typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Oak Forest January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Oak Forest Compares to Other Months

Weather in Oak Forest varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Oak Forest, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Oak Forest, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)66 mm (2.6 inches)82%moderate
February Weather-2°C (29°F)69 mm (2.7 inches)83%moderate
March Weather4°C (40°F)96 mm (3.8 inches)84%high
April Weather9°C (49°F)122 mm (4.8 inches)85%very high
May Weather16°C (61°F)163 mm (6.4 inches)79%very high
June Weather22°C (72°F)143 mm (5.6 inches)82%very high
July Weather24°C (76°F)114 mm (4.5 inches)80%very high
August Weather23°C (73°F)92 mm (3.6 inches)81%very high
September Weather20°C (68°F)80 mm (3.1 inches)80%very high
October Weather13°C (55°F)139 mm (5.5 inches)82%high
November Weather4°C (40°F)63 mm (2.5 inches)88%moderate
December Weather1°C (34°F)57 mm (2.2 inches)84%low

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