May Weather in Collinsville, United States

Last updated: June 24, 2025

In Collinsville, United States, the average temperature in May hovers around 21°C (70°F), with minimums dropping to 5°C (42°F) and maximums soaring to 34°C (94°F). Expect around 198 mm (7.8 in) of precipitation spread over 14 days, paired with a high average humidity of 83%. Prepare for a versatile climate!

May Temperature in Collinsville

In May in Collinsville, the average temperature is 21°C (70°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 5°C (42°F). This makes it an ideal time for travelers who enjoy warm weather but should also be prepared for cooler evenings.

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 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (42°F).

Data source: Temperature data for Collinsville generated using information from the Copernicus Climate Change Service.

May Precipitation in Collinsville

In Collinsville in May, the total precipitation amount is 198 mm (7.8 in) over a duration of 14 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 198 mm (7.8 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Collinsville

In Collinsville in May humidity is 83%. With an average temperature of 21°C (70°F), this humidity feels like you’re enveloped in a warm, tropical embrace, making it essential to stay hydrated and take breaks during your travels.

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.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	77 mm (3.0 inches)	77%	moderate
February Weather	5°C (41°F)	69 mm (2.7 inches)	76%	high
March Weather	12°C (54°F)	116 mm (4.6 inches)	71%	high
April Weather	15°C (60°F)	148 mm (5.8 inches)	73%	very high
May Weather	21°C (70°F)	198 mm (7.8 inches)	83%	very high
June Weather	26°C (79°F)	104 mm (4.1 inches)	83%	extreme
July Weather	28°C (83°F)	94 mm (3.7 inches)	81%	extreme
August Weather	27°C (81°F)	120 mm (4.7 inches)	73%	very high
September Weather	24°C (76°F)	87 mm (3.4 inches)	67%	very high
October Weather	17°C (62°F)	141 mm (5.6 inches)	72%	high
November Weather	10°C (50°F)	51 mm (2.0 inches)	82%	moderate
December Weather	7°C (44°F)	49 mm (1.9 inches)	85%	moderate