January Weather in Rock Island, United States

Last updated: June 24, 2025

In Rock Island, United States, the average temperature in January hovers around 20°C (69°F), offering a comfortable climate for outdoor adventures. Expect minimums of 4°C (39°F) and occasional highs reaching 31°C (88°F). During this period, anticipate 30 mm (1.2 in) of precipitation, typically spread across 5 days, and enjoy the average humidity of 83%, which adds a hint of freshness to the air.

January Temperature in Rock Island

In January in Rock Island, the average temperature is 20°C (69°F). Maximum temperatures can reach 31°C (88°F), while the minimum can drop as low as 4°C (39°F). Overall, it's a perfect time for travelers to enjoy mild weather and a variety of outdoor activities.

January Weather in Rock Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Rock Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Island, January typically has an average temperature of 20°C (69°F), with highs reaching up to 31°C (88°F) and lows dropping to around 4°C (39°F).

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

January Precipitation in Rock Island

In Rock Island in January, the precipitation amount is 30 mm (1.2 in) over the course of 5 days.

January Precipitation Trends in Rock Island

The chart displays monthly precipitation patterns in Rock Island, 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 Rock Island, January typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 5 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 Rock Island

In Rock Island in January, humidity is 83%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making every step slightly more laborious and the air thick with moisture, which can be quite stifling for traveling.

January Average Humidity in Rock Island

This chart illustrates the average monthly humidity levels in Rock Island, 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 Rock Island is approximately 83%, 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 Rock Island

In Rock Island in January, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Rock Island, you can refer to this Hourly UV Index in Rock Island.

Maximum UV Index Levels in Rock Island for January

The chart shows the monthly maximum UV Index (UVI) for Rock Island 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 Rock Island typically reaches 6, which falls under the high exposure category.

Data source: Rock Island 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 Rock Island Compares to Other Months

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

This table compares monthly weather conditions in Rock Island, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (69°F)	30 mm (1.2 inches)	83%	high
February Weather	23°C (73°F)	49 mm (1.9 inches)	80%	very high
March Weather	23°C (73°F)	28 mm (1.1 inches)	75%	very high
April Weather	25°C (77°F)	78 mm (3.1 inches)	68%	extreme
May Weather	26°C (80°F)	163 mm (6.4 inches)	65%	extreme
June Weather	28°C (82°F)	237 mm (9.3 inches)	73%	extreme
July Weather	28°C (83°F)	228 mm (9.0 inches)	77%	extreme
August Weather	29°C (84°F)	227 mm (8.9 inches)	80%	extreme
September Weather	28°C (83°F)	224 mm (8.8 inches)	83%	extreme
October Weather	27°C (81°F)	146 mm (5.8 inches)	83%	very high
November Weather	24°C (75°F)	74 mm (2.9 inches)	83%	high
December Weather	21°C (71°F)	36 mm (1.4 inches)	84%	high