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May Weather in Collinsville, United States

Last updated: June 24, 2025

In Collinsville, United States, the average temperature in May is a comfortable 19°C (67°F), but be prepared for a range; the minimum can dip to 0°C (32°F), while the maximum can soar up to 34°C (93°F). The month brings 141 mm (5.6 in) of precipitation over 13 days, contributing to an average humidity of 83%. Enjoy the balance of warmth and moisture!

May Temperature in Collinsville

In May in Collinsville, the average temperature is 19°C (67°F). Maximum temperatures can reach 34°C (93°F) while minimums can drop to as low as 0°C (32°F). This variability makes it essential for travelers to pack accordingly, anticipating both warm days and cooler nights.

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 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec394549586773787671624843
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 precipitation amount is 141 mm (5.6 in) spread over 13 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 141 mm (5.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec7511174141141987210813312179106
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 83%. With an average temperature of 19°C (67°F), this humidity feels like a warm, tropical blanket wrapping around you, making traveling feel a bit sluggish and sticky, yet still inviting as long as you stay hydrated and take breaks in the shade.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3689101110109853
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 Weather4°C (39°F)75 mm (3.0 inches)87%moderate
February Weather7°C (45°F)110 mm (4.4 inches)87%high
March Weather10°C (50°F)74 mm (2.9 inches)86%very high
April Weather15°C (59°F)141 mm (5.6 inches)84%very high
May Weather19°C (67°F)141 mm (5.6 inches)83%very high
June Weather23°C (74°F)98 mm (3.9 inches)83%extreme
July Weather26°C (78°F)72 mm (2.8 inches)79%very high
August Weather24°C (76°F)108 mm (4.3 inches)66%very high
September Weather22°C (71°F)133 mm (5.3 inches)68%very high
October Weather16°C (62°F)121 mm (4.8 inches)78%very high
November Weather9°C (48°F)79 mm (3.1 inches)89%moderate
December Weather6°C (43°F)105 mm (4.2 inches)86%moderate

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