September Weather in Knottsville, United States

Last updated: June 24, 2025

In September, the average temperature in Knottsville, United States is a pleasant 23°C (73°F). Expect a range between a cool 8°C (46°F) and a warm 35°C (96°F). This month brings about 96 mm (3.8 in) of precipitation, typically spread over 8 days. Additionally, the average humidity sits at a comfortable 71%, making it an inviting time to explore!

September Temperature in Knottsville

In September in Knottsville, the average temperature is 23°C (73°F). The maximum can reach 35°C (96°F) and the minimum can be as low as 8°C (46°F). This makes it an ideal destination for travelers seeking warm weather with a variety of activities, from enjoying sunny days to cooler evenings.

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

The chart illustrates September temperature patterns in Knottsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knottsville, September typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (46°F).

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

September Precipitation in Knottsville

In Knottsville in September, the precipitation amount is 96 mm (3.8 in) over the course of 8 days.

September Precipitation Trends in Knottsville

The chart displays monthly precipitation patterns in Knottsville, 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 Knottsville, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 8 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 Knottsville

In Knottsville in September humidity is 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

September Average Humidity in Knottsville

This chart illustrates the average monthly humidity levels in Knottsville, 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 Knottsville is approximately 71%, 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 Knottsville

In Knottsville 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 Knottsville.

Maximum UV Index Levels in Knottsville for September

The chart shows the monthly maximum UV Index (UVI) for Knottsville 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 Knottsville typically reaches 9, which falls under the very high exposure category.

Data source: Knottsville 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 Knottsville Compares to Other Months

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

This table compares monthly weather conditions in Knottsville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	93 mm (3.7 inches)	87%	moderate
February Weather	5°C (41°F)	136 mm (5.4 inches)	86%	high
March Weather	10°C (50°F)	129 mm (5.1 inches)	86%	high
April Weather	14°C (58°F)	135 mm (5.3 inches)	82%	very high
May Weather	21°C (69°F)	134 mm (5.3 inches)	82%	very high
June Weather	25°C (77°F)	126 mm (5.0 inches)	83%	extreme
July Weather	26°C (80°F)	99 mm (3.9 inches)	80%	very high
August Weather	25°C (78°F)	92 mm (3.6 inches)	74%	very high
September Weather	23°C (73°F)	96 mm (3.8 inches)	71%	very high
October Weather	16°C (62°F)	121 mm (4.8 inches)	78%	high
November Weather	8°C (46°F)	94 mm (3.7 inches)	88%	moderate
December Weather	6°C (42°F)	106 mm (4.2 inches)	88%	moderate