May Weather in Rockford, United States

Last updated: June 24, 2025

In Rockford, United States, the average temperature in May hovers around 15°C (59°F). Expect a broad range, with minimums dipping to 0°C (33°F) and maximums soaring to 36°C (97°F). Rain lovers should note an average precipitation of 112 mm (4.4 in) spread over approximately 11 days, while the air remains comfortably humid at 78%.

May Temperature in Rockford

In May in Rockford, the average temperature is 15°C (59°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 0°C (33°F). This diverse range of temperatures makes it essential for travelers to pack accordingly to fully enjoy their experience in Rockford.

May Weather in Rockford: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Rockford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockford, May typically has an average temperature of 15°C (59°F), with highs reaching up to 36°C (97°F) and lows dropping to around 0°C (33°F).

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

May Precipitation in Rockford

In Rockford in May, the precipitation amount is 112 mm (4.4 in) that occurs over the course of 11 days.

May Precipitation Trends in Rockford

The chart displays monthly precipitation patterns in Rockford, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Rockford, May typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Rockford

In Rockford in May, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

May Average Humidity in Rockford

This chart illustrates the average monthly humidity levels in Rockford, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Rockford is approximately 78%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Rockford

In Rockford in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Rockford.

Maximum UV Index Levels in Rockford for May

The chart shows the monthly maximum UV Index (UVI) for Rockford in May, 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 May, the maximum UV index in Rockford typically reaches 9, which falls under the very high exposure category.

Data source: Rockford May 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 May Weather in Rockford Compares to Other Months

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

This table compares monthly weather conditions in Rockford, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	25 mm (1.0 inches)	87%	low
February Weather	-9°C (17°F)	29 mm (1.2 inches)	90%	moderate
March Weather	0°C (33°F)	54 mm (2.1 inches)	85%	moderate
April Weather	6°C (43°F)	83 mm (3.3 inches)	84%	high
May Weather	15°C (59°F)	112 mm (4.4 inches)	78%	very high
June Weather	22°C (72°F)	83 mm (3.3 inches)	80%	very high
July Weather	24°C (75°F)	96 mm (3.8 inches)	81%	very high
August Weather	21°C (71°F)	152 mm (6.0 inches)	81%	very high
September Weather	18°C (64°F)	113 mm (4.4 inches)	81%	high
October Weather	9°C (48°F)	98 mm (3.8 inches)	84%	moderate
November Weather	1°C (33°F)	32 mm (1.3 inches)	88%	moderate
December Weather	-5°C (23°F)	44 mm (1.7 inches)	84%	low