September Weather in Alden, United States

Last updated: June 24, 2025

In September, the average temperature in Alden, United States is a comfortable 18°C (65°F). However, temperatures can vary significantly, ranging from a chilly 3°C (37°F) to a warm 33°C (91°F). Prepare for some rain, as the area experiences an average precipitation of 124 mm (4.9 in) over about 9 days. With an average humidity of 75%, expect a mix of refreshing breezes and moist air throughout the month.

September Temperature in Alden

In September in Alden, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums falling as low as 3°C (37°F). This makes it an ideal time for travelers who enjoy mild to warm weather, but it's wise to pack for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Alden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alden, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (37°F).

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

September Precipitation in Alden

In Alden in September, the precipitation amount is 124 mm (4.9 in) over the course of 9 days.

September Precipitation Trends in Alden

The chart displays monthly precipitation patterns in Alden, 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 Alden, September typically receives around 124 mm (4.9 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 Alden

In Alden in September, humidity is 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.

September Average Humidity in Alden

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

In Alden 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 Alden.

Maximum UV Index Levels in Alden for September

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

Data source: Alden 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 Alden Compares to Other Months

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

This table compares monthly weather conditions in Alden, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	35 mm (1.4 inches)	82%	moderate
February Weather	-9°C (17°F)	45 mm (1.8 inches)	84%	moderate
March Weather	1°C (34°F)	70 mm (2.8 inches)	80%	moderate
April Weather	7°C (44°F)	86 mm (3.4 inches)	81%	very high
May Weather	15°C (60°F)	145 mm (5.7 inches)	74%	very high
June Weather	22°C (72°F)	138 mm (5.4 inches)	80%	very high
July Weather	23°C (74°F)	104 mm (4.1 inches)	80%	very high
August Weather	21°C (70°F)	110 mm (4.3 inches)	77%	very high
September Weather	18°C (65°F)	124 mm (4.9 inches)	75%	very high
October Weather	9°C (49°F)	98 mm (3.9 inches)	80%	moderate
November Weather	1°C (34°F)	42 mm (1.7 inches)	87%	moderate
December Weather	-4°C (25°F)	41 mm (1.6 inches)	83%	moderate