May Weather in Effingham, United States

Last updated: June 24, 2025

In Effingham, United States, the average temperature in May hovers around 18°C (65°F). You can expect a minimum of 3°C (37°F) and a maximum of 35°C (96°F), providing quite a temperature range. With an average precipitation of 217 mm (8.6 in) spread over 13 days and humidity levels at 82%, it's advisable to prepare for occasional rain and comfortable, if somewhat humid, conditions.

May Temperature in Effingham

In May in Effingham, the average temperature is 18°C (65°F). Maximum temperatures can reach 35°C (96°F), while minimum temperatures can be as low as 3°C (37°F). This is a great time to visit for those who enjoy mild weather and a chance to experience the region's diverse climate.

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

The chart illustrates May temperature patterns in Effingham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Effingham, May typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (96°F) and lows dropping to around 3°C (37°F).

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

May Precipitation in Effingham

In Effingham in May, the precipitation amount is 217 mm (8.6 in) over a period of 13 days.

May Precipitation Trends in Effingham

The chart displays monthly precipitation patterns in Effingham, 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 Effingham, May typically receives around 217 mm (8.6 inches) of precipitation spread over approximately 13 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 Effingham

In Effingham in May, humidity is 82%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can quickly leave travelers feeling fatigued and in need of frequent breaks to stay refreshed and hydrated.

May Average Humidity in Effingham

This chart illustrates the average monthly humidity levels in Effingham, 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 Effingham is approximately 82%, 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 Effingham

In Effingham 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 Effingham.

Maximum UV Index Levels in Effingham for May

The chart shows the monthly maximum UV Index (UVI) for Effingham 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 Effingham typically reaches 10, which falls under the very high exposure category.

Data source: Effingham 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 Effingham Compares to Other Months

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

This table compares monthly weather conditions in Effingham, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	40 mm (1.6 inches)	76%	moderate
February Weather	0°C (31°F)	31 mm (1.2 inches)	77%	moderate
March Weather	7°C (46°F)	94 mm (3.7 inches)	70%	high
April Weather	12°C (54°F)	81 mm (3.2 inches)	73%	very high
May Weather	18°C (65°F)	217 mm (8.6 inches)	82%	very high
June Weather	25°C (77°F)	112 mm (4.4 inches)	82%	extreme
July Weather	27°C (80°F)	76 mm (3.0 inches)	81%	extreme
August Weather	25°C (77°F)	119 mm (4.7 inches)	78%	very high
September Weather	22°C (72°F)	83 mm (3.3 inches)	71%	very high
October Weather	13°C (56°F)	117 mm (4.6 inches)	71%	high
November Weather	6°C (43°F)	38 mm (1.5 inches)	81%	moderate
December Weather	2°C (37°F)	32 mm (1.2 inches)	84%	moderate