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May Weather in Rock Island, United States

Last updated: June 24, 2025

In May, the average temperature in Rock Island, United States is a pleasant 22°C (71°F). Temperatures can vary, with minimums dipping to 7°C (44°F) and maximums soaring to 34°C (94°F). Expect significant rainfall, with an average precipitation of 200 mm (7.9 in) over 12 days. The air is quite humid, boasting an average humidity level of 82% — perfect for those who enjoy a tropical feel!

May Temperature in Rock Island

In May in Rock Island, the average temperature is 22°C (71°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 7°C (44°F). This climate makes it an ideal time for outdoor adventures and enjoyable sightseeing.

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

The chart illustrates May 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, May typically has an average temperature of 22°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec414555617179838177645147
Data source: Temperature data for Rock Island 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 Rock Island

In Rock Island in May, the precipitation amount is 200 mm (7.9 in) spread over 12 days.

May Precipitation Trends in Rock Island

The chart displays monthly precipitation patterns in Rock Island, 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 Rock Island, May typically receives around 200 mm (7.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec831131191352008780116661317085
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Rock Island

In Rock Island in May, humidity is 82%. With an average temperature of 22°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and sweat-dripping, urging travelers to stay hydrated and seek the shade more often.

May Average Humidity in Rock Island

This chart illustrates the average monthly humidity levels in Rock Island, 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 Rock Island is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Rock Island

In Rock Island in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Rock Island.

Maximum UV Index Levels in Rock Island for May

The chart shows the monthly maximum UV Index (UVI) for Rock Island 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 Rock Island typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111111109754
Data source: Rock Island 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 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)83 mm (3.3 inches)82%moderate
February Weather7°C (45°F)113 mm (4.5 inches)79%high
March Weather13°C (56°F)119 mm (4.7 inches)77%high
April Weather16°C (61°F)135 mm (5.3 inches)78%very high
May Weather22°C (71°F)200 mm (7.9 inches)82%extreme
June Weather26°C (79°F)87 mm (3.4 inches)81%extreme
July Weather28°C (83°F)80 mm (3.1 inches)75%extreme
August Weather27°C (81°F)116 mm (4.6 inches)61%very high
September Weather25°C (77°F)66 mm (2.6 inches)59%very high
October Weather18°C (64°F)131 mm (5.2 inches)69%high
November Weather11°C (52°F)69 mm (2.7 inches)82%moderate
December Weather8°C (47°F)85 mm (3.3 inches)87%moderate

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