January Weather in South Milwaukee, United States

Last updated: June 24, 2025

In January, the average temperature in South Milwaukee, United States hovers around -3°C (27°F). Temperatures can drop as low as -25°C (-12°F), while the mercury might rise to a maximum of 8°C (46°F). Expect about 72 mm (2.8 in) of precipitation over 9 days, accompanied by an average humidity level of 85%.

January Temperature in South Milwaukee

In January in South Milwaukee, the average temperature is -3°C (27°F), with maximums reaching up to 8°C (46°F) and minimums plunging as low as -25°C (-12°F). Travelers should prepare for a cold climate and pack warm layers to ensure comfort while exploring.

January Weather in South Milwaukee: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in South Milwaukee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Milwaukee, January typically has an average temperature of -3°C (27°F), with highs reaching up to 8°C (46°F) and lows dropping to around -25°C (-12°F).

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

January Precipitation in South Milwaukee

In South Milwaukee in January, the precipitation amount is 72 mm (2.8 in) over the course of 9 days.

January Precipitation Trends in South Milwaukee

The chart displays monthly precipitation patterns in South Milwaukee, 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 South Milwaukee, January typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

January Humidity in South Milwaukee

In South Milwaukee in January humidity is 85%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps through layers of clothing, making travel seem daunting and the cold air sting your skin.

January Average Humidity in South Milwaukee

This chart illustrates the average monthly humidity levels in South Milwaukee, 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 South Milwaukee is approximately 85%, 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 South Milwaukee

In South Milwaukee in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in South Milwaukee, you can visit Hourly UV Index in South Milwaukee.

Maximum UV Index Levels in South Milwaukee for January

The chart shows the monthly maximum UV Index (UVI) for South Milwaukee 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 South Milwaukee typically reaches 2, which falls under the low exposure category.

Data source: South Milwaukee 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 South Milwaukee Compares to Other Months

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

This table compares monthly weather conditions in South Milwaukee, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	72 mm (2.8 inches)	85%	low
February Weather	-3°C (28°F)	71 mm (2.8 inches)	85%	moderate
March Weather	1°C (34°F)	76 mm (3.0 inches)	85%	moderate
April Weather	4°C (39°F)	112 mm (4.4 inches)	85%	very high
May Weather	8°C (46°F)	145 mm (5.7 inches)	78%	very high
June Weather	14°C (58°F)	87 mm (3.4 inches)	80%	very high
July Weather	20°C (68°F)	61 mm (2.4 inches)	78%	very high
August Weather	21°C (70°F)	60 mm (2.4 inches)	76%	very high
September Weather	18°C (66°F)	95 mm (3.7 inches)	79%	high
October Weather	12°C (54°F)	139 mm (5.5 inches)	83%	moderate
November Weather	4°C (40°F)	67 mm (2.6 inches)	88%	moderate
December Weather	1°C (34°F)	63 mm (2.5 inches)	81%	low