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May Weather in Collinsville, United States

Last updated: June 24, 2025

In May, the average temperature in Collinsville, United States is a pleasant 23°C (74°F). However, be prepared for a range of conditions, as minimums can drop to 7°C (45°F) while maximums can soar to 35°C (96°F). With an average precipitation of 114 mm (4.5 in) spread across 11 days, and an average humidity level of 82%, it's advisable to pack accordingly and stay hydrated during your visit!

May Temperature in Collinsville

In May in Collinsville, the average temperature is 23°C (74°F). Maximum temperatures can reach up to 35°C (96°F), while minimums can drop as low as 7°C (45°F). This makes it an ideal time to explore Collinsville, with warm days perfect for sightseeing and cooler evenings perfect for a cozy retreat.

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

The chart illustrates May temperature patterns in Collinsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Collinsville, May typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec485460647379818178695551
Data source: Temperature data for Collinsville 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 Collinsville

In Collinsville in May, the total precipitation amount is 114 mm (4.5 in) spread over 11 days.

May Precipitation Trends in Collinsville

The chart displays monthly precipitation patterns in Collinsville, 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 Collinsville, May typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1041481171341141671171289810768123
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Collinsville

In Collinsville in May, humidity is 82%. With an average temperature of 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

May Average Humidity in Collinsville

This chart illustrates the average monthly humidity levels in Collinsville, 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 Collinsville is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Collinsville

In Collinsville 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 Collinsville.

Maximum UV Index Levels in Collinsville for May

The chart shows the monthly maximum UV Index (UVI) for Collinsville 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 Collinsville typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111111111110864
Data source: Collinsville 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 Collinsville Compares to Other Months

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

This table compares monthly weather conditions in Collinsville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)104 mm (4.1 inches)85%moderate
February Weather12°C (54°F)148 mm (5.8 inches)84%high
March Weather16°C (60°F)117 mm (4.6 inches)82%very high
April Weather18°C (65°F)133 mm (5.3 inches)82%extreme
May Weather23°C (74°F)114 mm (4.5 inches)82%extreme
June Weather26°C (79°F)167 mm (6.6 inches)79%extreme
July Weather27°C (81°F)117 mm (4.6 inches)82%extreme
August Weather27°C (81°F)128 mm (5.1 inches)77%extreme
September Weather25°C (78°F)98 mm (3.8 inches)74%very high
October Weather20°C (69°F)107 mm (4.2 inches)73%very high
November Weather13°C (55°F)68 mm (2.7 inches)85%high
December Weather11°C (52°F)123 mm (4.8 inches)88%moderate

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