September Weather in Smithfield, United States

Last updated: June 24, 2025

In Smithfield, United States, the average temperature for September hovers around 23°C (74°F). Expect a minimum of 11°C (51°F) and a maximum soaring to 35°C (95°F). During this month, precipitation averages 126 mm (4.9 in) over approximately 11 days, contributing to an average humidity of 78%. Enjoy the variations the season brings!

September Temperature in Smithfield

In September in Smithfield, the average temperature is 23°C (74°F). The maximum can reach 35°C (95°F) and the minimum can be as low as 11°C (51°F). It's a great time to visit, offering warm days and cooler nights, perfect for exploring and enjoying the local attractions.

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 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 11°C (51°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 126 mm (4.9 in) over the course of 11 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 126 mm (4.9 inches) of precipitation spread over approximately 11 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 78%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace, making travel somewhat stifling and prompting frequent breaks to hydrate and seek shade.

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 78%, 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	5°C (42°F)	85 mm (3.3 inches)	84%	moderate
February Weather	8°C (47°F)	107 mm (4.2 inches)	83%	high
March Weather	10°C (51°F)	88 mm (3.5 inches)	82%	high
April Weather	16°C (61°F)	106 mm (4.2 inches)	81%	very high
May Weather	20°C (69°F)	122 mm (4.8 inches)	80%	very high
June Weather	24°C (76°F)	117 mm (4.6 inches)	82%	very high
July Weather	27°C (81°F)	135 mm (5.3 inches)	81%	extreme
August Weather	26°C (79°F)	169 mm (6.7 inches)	81%	very high
September Weather	23°C (74°F)	126 mm (4.9 inches)	78%	very high
October Weather	18°C (65°F)	89 mm (3.5 inches)	80%	very high
November Weather	11°C (52°F)	76 mm (3.0 inches)	84%	moderate
December Weather	8°C (46°F)	84 mm (3.3 inches)	84%	moderate