September Weather in Smithfield, United States

Last updated: June 24, 2025

In Smithfield, United States, the average temperature in September hovers around 20°C (68°F). Expect a range that can dip as low as 5°C (41°F) and soar to a sweltering 34°C (94°F). During this month, precipitation totals approximately 117 mm (4.6 in) spread across 10 days, contributing to an average humidity level of 77%. Embrace the variability and be prepared for both warmth and occasional rain!

September Temperature in Smithfield

In September in Smithfield, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (94°F) and minimums can drop as low as 5°C (41°F). This varied climate makes it a great time for travelers to experience both warm days and cooler evenings, perfect for outdoor activities and exploration.

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 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°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 is 117 mm (4.6 in) recorded 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 117 mm (4.6 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 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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	0°C (31°F)	92 mm (3.6 inches)	88%	moderate
February Weather	2°C (35°F)	117 mm (4.6 inches)	88%	moderate
March Weather	6°C (42°F)	108 mm (4.3 inches)	87%	high
April Weather	11°C (52°F)	135 mm (5.3 inches)	87%	very high
May Weather	17°C (63°F)	133 mm (5.2 inches)	81%	very high
June Weather	21°C (70°F)	144 mm (5.7 inches)	83%	very high
July Weather	24°C (75°F)	130 mm (5.1 inches)	82%	very high
August Weather	23°C (73°F)	99 mm (3.9 inches)	76%	very high
September Weather	20°C (68°F)	117 mm (4.6 inches)	77%	very high
October Weather	14°C (58°F)	121 mm (4.8 inches)	82%	high
November Weather	6°C (42°F)	92 mm (3.6 inches)	89%	moderate
December Weather	2°C (37°F)	104 mm (4.1 inches)	86%	low