May Weather in Smithfield, United States

Last updated: June 24, 2025

In May, the average temperature in Smithfield, United States hovers around 12°C (55°F). Expect temperatures to range from a chilly 0°C (32°F) at the low end to a warm 33°C (91°F) at the high. With 85 mm (3.3 in) of precipitation spread over 9 days, it's wise to pack an umbrella. The air tends to be quite humid too, with an average humidity of 76%, making for a cozy yet refreshing atmosphere.

May Temperature in Smithfield

In May in Smithfield, the average temperature is 12°C (55°F). Maximum temperatures can reach 33°C (91°F), while the minimum can drop as low as 0°C (32°F). It's advisable to pack layers to accommodate the varying temperatures throughout the day while traveling.

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

The chart illustrates May temperature patterns in Smithfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Smithfield, May typically has an average temperature of 12°C (55°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (32°F).

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

May Precipitation in Smithfield

In Smithfield in May, the precipitation amount is 85 mm (3.3 in) over the course of 9 days.

May Precipitation Trends in Smithfield

The chart displays monthly precipitation patterns in Smithfield, 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 Smithfield, May typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 9 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 Smithfield

In Smithfield in May humidity is 76%. With an average temperature of 12°C (55°F), this humidity feels like a damp embrace, making traveling somewhat uncomfortable as the air clings to your skin and can leave you feeling cooler than expected.

May Average Humidity in Smithfield

This chart illustrates the average monthly humidity levels in Smithfield, 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 Smithfield is approximately 76%, 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 Smithfield

In Smithfield in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Smithfield.

Maximum UV Index Levels in Smithfield for May

The chart shows the monthly maximum UV Index (UVI) for Smithfield 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 Smithfield typically reaches 9, which falls under the very high exposure category.

Data source: Smithfield 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 Smithfield Compares to Other Months

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

This table compares monthly weather conditions in Smithfield, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	84 mm (3.3 inches)	88%	low
February Weather	-5°C (22°F)	81 mm (3.2 inches)	88%	moderate
March Weather	-1°C (30°F)	72 mm (2.8 inches)	85%	moderate
April Weather	6°C (43°F)	121 mm (4.8 inches)	81%	high
May Weather	12°C (55°F)	85 mm (3.3 inches)	76%	very high
June Weather	18°C (65°F)	76 mm (3.0 inches)	74%	very high
July Weather	21°C (70°F)	110 mm (4.3 inches)	74%	very high
August Weather	20°C (69°F)	72 mm (2.8 inches)	74%	very high
September Weather	16°C (62°F)	70 mm (2.7 inches)	77%	high
October Weather	10°C (50°F)	124 mm (4.9 inches)	82%	moderate
November Weather	2°C (36°F)	108 mm (4.3 inches)	85%	moderate
December Weather	-4°C (25°F)	112 mm (4.4 inches)	84%	low