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May Weather in Rockford, United States

Last updated: June 24, 2025

In Rockford, United States, the average temperature in May hovers around 15°C (60°F). However, temperatures can vary dramatically, with lows sinking to -3°C (27°F) and highs peaking at a sweltering 34°C (94°F). Expect 139 mm (5.5 in) of precipitation spread over 15 days, while the average humidity remains notably high at 82%. This blend of climate factors makes Rockford both an intriguing and challenging destination.

May Temperature in Rockford

In May in Rockford, the average temperature is 15°C (60°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as -3°C (27°F).

Travelers should be prepared for a wide range of temperatures, making layering essential for comfort during their stay.

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 (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec262736465970757265533832
Data source: Temperature data for Rockford 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.

May Precipitation in Rockford

In Rockford in May, the precipitation amount is 139 mm (5.5 in), occurring over 15 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 139 mm (5.5 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec6469688713912470781151326367
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Rockford

In Rockford in May humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)64 mm (2.5 inches)87%low
February Weather-3°C (27°F)69 mm (2.7 inches)87%moderate
March Weather2°C (37°F)67 mm (2.7 inches)86%moderate
April Weather8°C (47°F)87 mm (3.4 inches)87%very high
May Weather15°C (60°F)139 mm (5.5 inches)82%very high
June Weather21°C (70°F)124 mm (4.9 inches)81%very high
July Weather24°C (75°F)70 mm (2.7 inches)78%very high
August Weather22°C (72°F)78 mm (3.1 inches)79%very high
September Weather18°C (65°F)115 mm (4.5 inches)79%high
October Weather11°C (53°F)132 mm (5.2 inches)82%moderate
November Weather3°C (38°F)63 mm (2.5 inches)87%moderate
December Weather0°C (32°F)67 mm (2.7 inches)86%low

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