September Weather in Montvale, United States

Last updated: June 24, 2025

In September, the average temperature in Montvale, United States is a pleasant 21°C (69°F). However, temperatures can fluctuate significantly, ranging from a chilly 3°C (38°F) to a sweltering 35°C (94°F). Expect around 106 mm (4.2 in) of precipitation spread over 10 days, accompanied by an average humidity level of 75%. Whether you're embracing the warmth or braving the chill, be prepared for a mix of weather!

September Temperature in Montvale

In September in Montvale, the average temperature is 21°C (69°F). Maximum can reach 35°C (94°F) and minimum can be as low as 3°C (38°F). This makes Montvale a great destination for travelers looking to enjoy a variety of weather conditions, so pack accordingly!

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

The chart illustrates September temperature patterns in Montvale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montvale, September typically has an average temperature of 21°C (69°F), with highs reaching up to 35°C (94°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Montvale

In Montvale in September, the precipitation amount is 106 mm (4.2 in) over a span of 10 days.

September Precipitation Trends in Montvale

The chart displays monthly precipitation patterns in Montvale, 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 Montvale, September typically receives around 106 mm (4.2 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 Montvale

In Montvale in September, humidity is 75%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace that can make even a short walk feel exhausting for travelers, often leading to a longing for refreshing breezes or air-conditioned retreats.

September Average Humidity in Montvale

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

In Montvale in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Montvale.

Maximum UV Index Levels in Montvale for September

The chart shows the monthly maximum UV Index (UVI) for Montvale 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 Montvale typically reaches 9, which falls under the very high exposure category.

Data source: Montvale 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 Montvale Compares to Other Months

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

This table compares monthly weather conditions in Montvale, 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)	73 mm (2.9 inches)	84%	moderate
February Weather	5°C (41°F)	111 mm (4.4 inches)	84%	high
March Weather	8°C (47°F)	77 mm (3.0 inches)	84%	very high
April Weather	13°C (56°F)	129 mm (5.1 inches)	82%	very high
May Weather	18°C (65°F)	137 mm (5.4 inches)	82%	very high
June Weather	22°C (72°F)	108 mm (4.2 inches)	83%	extreme
July Weather	25°C (77°F)	60 mm (2.4 inches)	79%	very high
August Weather	23°C (75°F)	102 mm (4.0 inches)	77%	very high
September Weather	21°C (69°F)	106 mm (4.2 inches)	75%	very high
October Weather	15°C (60°F)	117 mm (4.6 inches)	81%	high
November Weather	7°C (45°F)	80 mm (3.2 inches)	87%	moderate
December Weather	4°C (40°F)	101 mm (4.0 inches)	85%	moderate