January Weather in Forest Park, United States

Last updated: June 24, 2025

In January, the average temperature in Forest Park, United States hovers around 8°C (46°F). Expect temperature fluctuations, with potential lows of -10°C (14°F) and highs reaching up to 25°C (78°F). During this period, the region experiences approximately 101 mm (4.0 in) of precipitation over 8 days, contributing to an average humidity of 86%.

January Temperature in Forest Park

In January in Forest Park, the average temperature is 8°C (46°F). The maximum can reach 25°C (78°F), while the minimum can drop as low as -10°C (14°F). It's advisable to pack layers for your trip to stay comfortable in the fluctuating temperatures.

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

The chart illustrates January temperature patterns in Forest Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest Park, January typically has an average temperature of 8°C (46°F), with highs reaching up to 25°C (78°F) and lows dropping to around -10°C (14°F).

Data source: Temperature data for Forest Park generated using information from the Copernicus Climate Change Service.

January Precipitation in Forest Park

In Forest Park in January, the precipitation amount is 101 mm (4.0 in) spread over 8 days.

January Precipitation Trends in Forest Park

The chart displays monthly precipitation patterns in Forest Park, 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 Forest Park, January typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Forest Park

In Forest Park in January humidity is 86%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while exploring.

January Average Humidity in Forest Park

This chart illustrates the average monthly humidity levels in Forest Park, 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 Forest Park is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Forest Park

In Forest Park in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Forest Park for better planning.

Maximum UV Index Levels in Forest Park for January

The chart shows the monthly maximum UV Index (UVI) for Forest Park 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 Forest Park typically reaches 4, which falls under the moderate exposure category.

Data source: Forest Park 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 Forest Park Compares to Other Months

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

This table compares monthly weather conditions in Forest Park, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	101 mm (4.0 inches)	86%	moderate
February Weather	11°C (52°F)	133 mm (5.2 inches)	84%	high
March Weather	14°C (57°F)	113 mm (4.5 inches)	83%	very high
April Weather	17°C (63°F)	115 mm (4.5 inches)	81%	extreme
May Weather	22°C (72°F)	93 mm (3.7 inches)	81%	extreme
June Weather	25°C (77°F)	116 mm (4.6 inches)	81%	extreme
July Weather	27°C (80°F)	103 mm (4.1 inches)	83%	extreme
August Weather	26°C (79°F)	140 mm (5.5 inches)	81%	very high
September Weather	24°C (76°F)	109 mm (4.3 inches)	82%	very high
October Weather	19°C (67°F)	110 mm (4.3 inches)	78%	very high
November Weather	12°C (53°F)	79 mm (3.1 inches)	86%	high
December Weather	9°C (49°F)	133 mm (5.2 inches)	89%	moderate