September Weather in Sistersville, United States

Last updated: June 24, 2025

In Sistersville, United States, the average temperature in September hovers around 21°C (69°F), offering a pleasant climate. However, be prepared for fluctuations, as temperatures can dip to a minimum of 5°C (41°F) and soar to a maximum of 36°C (97°F). Rainfall is not uncommon, with an average precipitation of 105 mm (4.1 in) spread across 9 days. The air carries an average humidity of 73%, contributing to the region's unique atmospheric charm.

September Temperature in Sistersville

In September in Sistersville, the average temperature is 21°C (69°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 5°C (41°F). This climate makes Sistersville an ideal destination for travelers seeking warm weather, while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Sistersville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sistersville, September typically has an average temperature of 21°C (69°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Sistersville

In Sistersville in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

September Precipitation Trends in Sistersville

The chart displays monthly precipitation patterns in Sistersville, 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 Sistersville, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 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 Sistersville

In Sistersville in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.

September Average Humidity in Sistersville

This chart illustrates the average monthly humidity levels in Sistersville, 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 Sistersville is approximately 73%, 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 Sistersville

In Sistersville 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 Sistersville.

Maximum UV Index Levels in Sistersville for September

The chart shows the monthly maximum UV Index (UVI) for Sistersville 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 Sistersville typically reaches 8, which falls under the very high exposure category.

Data source: Sistersville 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 Sistersville Compares to Other Months

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

This table compares monthly weather conditions in Sistersville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	93 mm (3.7 inches)	88%	moderate
February Weather	3°C (38°F)	128 mm (5.0 inches)	88%	moderate
March Weather	7°C (45°F)	115 mm (4.5 inches)	88%	high
April Weather	12°C (54°F)	148 mm (5.8 inches)	86%	very high
May Weather	18°C (64°F)	141 mm (5.6 inches)	82%	very high
June Weather	22°C (71°F)	170 mm (6.7 inches)	84%	very high
July Weather	24°C (76°F)	126 mm (5.0 inches)	82%	very high
August Weather	23°C (74°F)	100 mm (3.9 inches)	73%	very high
September Weather	21°C (69°F)	105 mm (4.1 inches)	73%	very high
October Weather	15°C (59°F)	114 mm (4.5 inches)	81%	high
November Weather	7°C (44°F)	86 mm (3.4 inches)	89%	moderate
December Weather	4°C (39°F)	118 mm (4.7 inches)	86%	moderate