September Weather in Leyden, United States

Last updated: June 24, 2025

In September, the average temperature in Leyden, United States hovers around 17°C (62°F), with a minimum dip to 0°C (32°F) and soaring up to a warm 31°C (88°F). Rainfall can be expected, with an average precipitation of 112 mm (4.4 in) spread over 9 days. Make sure to prepare for the moist air, as the average humidity stands at a comfortable 72%.

September Temperature in Leyden

In September in Leyden, the average temperature is 17°C (62°F). The maximum can reach 31°C (88°F) and the minimum can be as low as 0°C (32°F). It's a great time to travel to Leyden, so be prepared for varying temperatures and pack accordingly!

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

The chart illustrates September temperature patterns in Leyden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Leyden, September typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Leyden

In Leyden in September, the total precipitation amount is 112 mm (4.4 in), occurring over a span of 9 days.

September Precipitation Trends in Leyden

The chart displays monthly precipitation patterns in Leyden, 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 Leyden, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 9 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 Leyden

In Leyden in September humidity is 72%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially heavy on the skin, prompting travelers to seek shade during midday excursions.

September Average Humidity in Leyden

This chart illustrates the average monthly humidity levels in Leyden, 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 Leyden is approximately 72%, 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 Leyden

In Leyden 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 Leyden.

Maximum UV Index Levels in Leyden for September

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

Data source: Leyden 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 Leyden Compares to Other Months

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

This table compares monthly weather conditions in Leyden, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (24°F)	85 mm (3.3 inches)	89%	moderate
February Weather	-3°C (27°F)	101 mm (4.0 inches)	88%	moderate
March Weather	0°C (33°F)	84 mm (3.3 inches)	86%	high
April Weather	7°C (45°F)	151 mm (5.9 inches)	84%	very high
May Weather	14°C (57°F)	108 mm (4.3 inches)	76%	very high
June Weather	19°C (66°F)	102 mm (4.0 inches)	72%	very high
July Weather	22°C (71°F)	169 mm (6.6 inches)	66%	very high
August Weather	21°C (69°F)	126 mm (5.0 inches)	64%	very high
September Weather	17°C (62°F)	112 mm (4.4 inches)	72%	very high
October Weather	11°C (51°F)	173 mm (6.8 inches)	81%	high
November Weather	3°C (37°F)	107 mm (4.2 inches)	87%	moderate
December Weather	-2°C (29°F)	125 mm (4.9 inches)	84%	low