September Weather in Jarrettsville, United States

Last updated: June 24, 2025

In Jarrettsville, United States, the average temperature in September hovers around 21°C (71°F), making it a pleasant destination. However, temperatures can fluctuate, with a minimum of 6°C (44°F) and reaching as high as 33°C (92°F). Expect 116 mm (4.6 in) of precipitation over approximately 10 days, and be prepared for a humid environment with an average humidity of 75%.

September Temperature in Jarrettsville

In September in Jarrettsville, the average temperature is 21°C (71°F). Maximums can reach 33°C (92°F), while minimums can be as low as 6°C (44°F). Overall, it's a great time to travel to Jarrettsville for pleasant weather and diverse temperature variations.

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

The chart illustrates September temperature patterns in Jarrettsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jarrettsville, September typically has an average temperature of 21°C (71°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Jarrettsville

In Jarrettsville in September, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in Jarrettsville

The chart displays monthly precipitation patterns in Jarrettsville, 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 Jarrettsville, September typically receives around 116 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.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Jarrettsville

In Jarrettsville in September, humidity is 75%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel slightly uncomfortable but offering a lush, vibrant atmosphere that invites exploration at a leisurely pace.

September Average Humidity in Jarrettsville

This chart illustrates the average monthly humidity levels in Jarrettsville, 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 Jarrettsville is approximately 75%, 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 Jarrettsville

In Jarrettsville 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 Jarrettsville.

Maximum UV Index Levels in Jarrettsville for September

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

Data source: Jarrettsville 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 Jarrettsville Compares to Other Months

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

This table compares monthly weather conditions in Jarrettsville, 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 (36°F)	63 mm (2.5 inches)	84%	moderate
February Weather	4°C (39°F)	98 mm (3.9 inches)	83%	moderate
March Weather	7°C (45°F)	94 mm (3.7 inches)	83%	high
April Weather	13°C (55°F)	106 mm (4.2 inches)	81%	very high
May Weather	18°C (65°F)	145 mm (5.7 inches)	78%	very high
June Weather	23°C (74°F)	117 mm (4.6 inches)	79%	very high
July Weather	26°C (79°F)	151 mm (6.0 inches)	74%	very high
August Weather	24°C (76°F)	154 mm (6.1 inches)	72%	very high
September Weather	21°C (71°F)	116 mm (4.6 inches)	75%	very high
October Weather	16°C (61°F)	109 mm (4.3 inches)	81%	high
November Weather	8°C (46°F)	88 mm (3.5 inches)	85%	moderate
December Weather	4°C (40°F)	102 mm (4.0 inches)	84%	moderate