September Weather in Harristown, United States

Last updated: June 24, 2025

In Harristown, United States, the average temperature in September hovers around 21°C (71°F), with a minimum dipping to 6°C (42°F) and a maximum reaching up to 34°C (93°F). Expect approximately 71 mm (2.8 in) of precipitation spread over 7 days, while the average humidity remains a comfortable 79%. Embrace the warmth and occasional rain as you explore the beauty of this vibrant locale!

September Temperature in Harristown

In September in Harristown, the average temperature is 21°C (71°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 6°C (42°F). This diverse range of temperatures makes it a favorable time for travelers to enjoy outdoor activities and explore the local attractions comfortably.

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

The chart illustrates September temperature patterns in Harristown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harristown, September typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (42°F).

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

September Precipitation in Harristown

In Harristown in September, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.

September Precipitation Trends in Harristown

The chart displays monthly precipitation patterns in Harristown, 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 Harristown, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 7 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 Harristown

In Harristown in September humidity is 79%. With an average temperature of 21°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and exhausting. Travelers should be prepared to hydrate frequently and take breaks in shaded areas to fully enjoy their time exploring.

September Average Humidity in Harristown

This chart illustrates the average monthly humidity levels in Harristown, 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 Harristown is approximately 79%, 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 Harristown

In Harristown 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 Harristown.

Maximum UV Index Levels in Harristown for September

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

Data source: Harristown 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 Harristown Compares to Other Months

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

This table compares monthly weather conditions in Harristown, 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 (29°F)	76 mm (3.0 inches)	84%	moderate
February Weather	0°C (32°F)	76 mm (3.0 inches)	82%	moderate
March Weather	6°C (44°F)	131 mm (5.2 inches)	84%	high
April Weather	11°C (53°F)	132 mm (5.2 inches)	83%	very high
May Weather	19°C (66°F)	149 mm (5.9 inches)	80%	very high
June Weather	24°C (75°F)	112 mm (4.4 inches)	83%	extreme
July Weather	25°C (78°F)	114 mm (4.5 inches)	82%	extreme
August Weather	23°C (74°F)	101 mm (4.0 inches)	82%	very high
September Weather	21°C (71°F)	71 mm (2.8 inches)	79%	very high
October Weather	14°C (58°F)	120 mm (4.7 inches)	79%	high
November Weather	5°C (42°F)	76 mm (3.0 inches)	88%	moderate
December Weather	2°C (36°F)	53 mm (2.1 inches)	87%	moderate