September Weather in Hartley, United States

Last updated: June 24, 2025

In September, the average temperature in Hartley, United States hovers around 19°C (66°F), offering a pleasant climate for outdoor activities. You can expect minimum temperatures to dip to 3°C (38°F) and soar up to a warm 33°C (91°F). Rain may grace your visit with approximately 109 mm (4.3 in) over 9 days, while the average humidity levels at a comfortable 75% keep the air fresh. 🌦️

September Temperature in Hartley

In September in Hartley, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 3°C (38°F). This climate makes Hartley an ideal destination for travelers seeking a mix of warm and cool experiences.

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

The chart illustrates September temperature patterns in Hartley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartley, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Hartley

In Hartley in September, the total precipitation amount is 109 mm (4.3 in) spread over 9 days.

September Precipitation Trends in Hartley

The chart displays monthly precipitation patterns in Hartley, 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 Hartley, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 9 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 Hartley

In Hartley in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

September Average Humidity in Hartley

This chart illustrates the average monthly humidity levels in Hartley, 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 Hartley 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 Hartley

In Hartley 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 Hartley.

Maximum UV Index Levels in Hartley for September

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

Data source: Hartley 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 Hartley Compares to Other Months

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

This table compares monthly weather conditions in Hartley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	28 mm (1.1 inches)	80%	moderate
February Weather	-7°C (19°F)	34 mm (1.3 inches)	84%	moderate
March Weather	2°C (35°F)	69 mm (2.7 inches)	75%	moderate
April Weather	7°C (45°F)	101 mm (4.0 inches)	79%	very high
May Weather	15°C (59°F)	136 mm (5.3 inches)	74%	very high
June Weather	22°C (72°F)	126 mm (5.0 inches)	81%	extreme
July Weather	24°C (75°F)	73 mm (2.9 inches)	82%	very high
August Weather	22°C (71°F)	104 mm (4.1 inches)	80%	very high
September Weather	19°C (66°F)	109 mm (4.3 inches)	75%	very high
October Weather	9°C (49°F)	88 mm (3.5 inches)	77%	moderate
November Weather	2°C (35°F)	31 mm (1.2 inches)	85%	moderate
December Weather	-3°C (27°F)	39 mm (1.5 inches)	83%	moderate