September Weather in Smithfield, United States

Last updated: June 24, 2025

In September, the average temperature in Smithfield, United States is a comfortable 16°C (62°F). However, temperatures can range from a chilly 0°C (32°F) to a warm 32°C (89°F). Expect about 70 mm (2.7 in) of precipitation over 7 days, with an average humidity of 77%. Perfect for those who enjoy a mix of cool breezes and occasional rainfall!

September Temperature in Smithfield

In September in Smithfield, the average temperature is 16°C (62°F). Maximum can reach 32°C (89°F) and minimum can be as low as 0°C (32°F). This makes it a great time to visit, as you can enjoy warm days while being prepared for cooler evenings.

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

The chart illustrates September 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, September typically has an average temperature of 16°C (62°F), with highs reaching up to 32°C (89°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.

September Precipitation in Smithfield

In Smithfield in September, the precipitation amount is 70 mm (2.7 in) over a period of 7 days.

September Precipitation Trends in Smithfield

The chart displays monthly precipitation patterns in Smithfield, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Smithfield, September typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Smithfield

In Smithfield in September, humidity is 77%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel heavy and draining, so travelers may want to plan for breaks in shaded areas and stay hydrated.

September Average Humidity in Smithfield

This chart illustrates the average monthly humidity levels in Smithfield, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Smithfield is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Smithfield

In Smithfield in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Smithfield.

Maximum UV Index Levels in Smithfield for September

The chart shows the monthly maximum UV Index (UVI) for Smithfield in September, 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 September, the maximum UV index in Smithfield typically reaches 7, which falls under the high exposure category.

Data source: Smithfield September 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 September 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 September’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 September’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