September Weather in Vernonia, United States

Last updated: June 24, 2025

In September, the average temperature in Vernonia, United States is a pleasant 16°C (60°F), with fluctuations ranging from a chilly 4°C (40°F) to a balmy 34°C (93°F). Expect about 79 mm (3.1 in) of precipitation over 9 days, and enjoy an average humidity level of 71% throughout the month.

September Temperature in Vernonia

In September in Vernonia, the average temperature is 16°C (60°F). Maximums can reach 34°C (93°F), while minimums can drop to as low as 4°C (40°F). This makes it a great time for travelers to enjoy a variety of outdoor activities, so be sure to pack for both warm and cool weather when visiting.

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

The chart illustrates September temperature patterns in Vernonia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vernonia, September typically has an average temperature of 16°C (60°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Vernonia

In Vernonia in September, the precipitation amount is 79 mm (3.1 in) spread over 9 days.

September Precipitation Trends in Vernonia

The chart displays monthly precipitation patterns in Vernonia, 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 Vernonia, September typically receives around 79 mm (3.1 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 Vernonia

In Vernonia in September, humidity is 71%. With an average temperature of 16°C (60°F), this humidity feels like a warm, damp embrace, making outdoor activities slightly uncomfortable but still manageable for travelers who enjoy a refreshing change in climate.

September Average Humidity in Vernonia

This chart illustrates the average monthly humidity levels in Vernonia, 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 Vernonia is approximately 71%, 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 Vernonia

In Vernonia in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Vernonia.

Maximum UV Index Levels in Vernonia for September

The chart shows the monthly maximum UV Index (UVI) for Vernonia 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 Vernonia typically reaches 7, which falls under the high exposure category.

Data source: Vernonia 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 Vernonia Compares to Other Months

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

This table compares monthly weather conditions in Vernonia, 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 (40°F)	194 mm (7.6 inches)	85%	low
February Weather	4°C (39°F)	180 mm (7.1 inches)	84%	moderate
March Weather	6°C (43°F)	152 mm (6.0 inches)	85%	moderate
April Weather	9°C (48°F)	132 mm (5.2 inches)	83%	high
May Weather	12°C (54°F)	72 mm (2.9 inches)	83%	very high
June Weather	15°C (59°F)	62 mm (2.5 inches)	83%	very high
July Weather	17°C (63°F)	10 mm (0.4 inches)	82%	very high
August Weather	18°C (65°F)	10 mm (0.4 inches)	74%	very high
September Weather	16°C (60°F)	79 mm (3.1 inches)	71%	high
October Weather	10°C (50°F)	119 mm (4.7 inches)	81%	moderate
November Weather	7°C (44°F)	176 mm (6.9 inches)	87%	moderate
December Weather	4°C (39°F)	206 mm (8.1 inches)	87%	low