September Weather in Smithfield, United States

Last updated: June 24, 2025

In September, the average temperature in Smithfield, United States is a pleasant 24°C (75°F). However, temperatures can vary widely, with minimums dropping to 9°C (49°F) and peaks reaching up to 35°C (95°F). Expect about 134 mm (5.3 in) of precipitation spread over 10 days, contributing to a rather high average humidity of 79%.

September Temperature in Smithfield

In September in Smithfield, the average temperature is 24°C (75°F). Maximums can reach 35°C (95°F) and minimums can be as low as 9°C (49°F). This varied climate makes it an ideal destination for travelers looking to experience both warm sunny days and 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 24°C (75°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (49°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 total precipitation amount reaches 134 mm (5.3 in) over a span of 10 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 134 mm (5.3 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Smithfield

In Smithfield in September, humidity is 79%. With an average temperature of 24°C (75°F), this humidity feels like a warm, tropical embrace, making traveling quite sticky and requiring ample hydration and light clothing to keep comfortable while exploring.

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 79%, 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 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 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 9, which falls under the very 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 (45°F)	92 mm (3.6 inches)	85%	moderate
February Weather	10°C (50°F)	92 mm (3.6 inches)	82%	high
March Weather	12°C (54°F)	73 mm (2.9 inches)	81%	very high
April Weather	17°C (63°F)	106 mm (4.2 inches)	80%	very high
May Weather	22°C (72°F)	118 mm (4.7 inches)	81%	very high
June Weather	25°C (77°F)	125 mm (4.9 inches)	81%	extreme
July Weather	27°C (81°F)	124 mm (4.9 inches)	81%	extreme
August Weather	26°C (79°F)	158 mm (6.2 inches)	80%	very high
September Weather	24°C (75°F)	134 mm (5.3 inches)	79%	very high
October Weather	19°C (66°F)	68 mm (2.7 inches)	80%	very high
November Weather	11°C (53°F)	84 mm (3.3 inches)	85%	moderate
December Weather	9°C (48°F)	109 mm (4.3 inches)	86%	moderate