May Weather in Rockford, United States

Last updated: June 24, 2025

In Rockford, United States, the average temperature in May hovers around 17°C (63°F). However, temperatures can fluctuate significantly, with a minimum of -1°C (30°F) and a maximum reaching 34°C (94°F). Expect precipitation to amount to 128 mm (5.1 in) over 14 days, and prepare for a rather humid atmosphere, with an average humidity of 81%.

May Temperature in Rockford

In May in Rockford, the average temperature is 17°C (63°F), with maximums reaching 34°C (94°F) and minimums dropping as low as -1°C (30°F). This variation makes it an ideal time for travelers to pack both light clothing for warm days and warmer layers for chilly nights.

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 17°C (63°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516372767368574135
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 128 mm (5.1 in) spread over 14 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 128 mm (5.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec75841009212812410910370938364
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 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-2°C (29°F)75 mm (2.9 inches)88%moderate
February Weather0°C (32°F)84 mm (3.3 inches)87%moderate
March Weather5°C (41°F)100 mm (3.9 inches)87%high
April Weather10°C (51°F)92 mm (3.6 inches)87%very high
May Weather17°C (63°F)128 mm (5.1 inches)81%very high
June Weather22°C (73°F)123 mm (4.9 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (74°F)103 mm (4.0 inches)78%very high
September Weather20°C (69°F)70 mm (2.8 inches)78%very high
October Weather14°C (57°F)93 mm (3.7 inches)82%high
November Weather5°C (42°F)83 mm (3.3 inches)89%moderate
December Weather2°C (35°F)64 mm (2.5 inches)86%low

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