September Weather in Rio Dell, United States

Last updated: June 24, 2025

In September, the average temperature in Rio Dell, United States hovers around 16°C (61°F), with a wide range that can dip to a chilly 4°C (39°F) or soar to a balmy 36°C (98°F). Expect a modest precipitation of 23 mm (0.9 in) over approximately 3 days, while the average humidity sits at a comfortable 62%. Prepare for a month of delightful weather variations!

September Temperature in Rio Dell

In September in Rio Dell, the average temperature is 16°C (61°F). Maximum temperatures can reach 36°C (98°F), while the minimum can drop to as low as 4°C (39°F). Be prepared for a range of weather conditions as you plan your travels.

September Weather in Rio Dell: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rio Dell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Dell, September typically has an average temperature of 16°C (61°F), with highs reaching up to 36°C (98°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Rio Dell

In Rio Dell in September, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

September Precipitation Trends in Rio Dell

The chart displays monthly precipitation patterns in Rio Dell, 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 Rio Dell, September typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 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 Rio Dell

In Rio Dell in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Rio Dell

This chart illustrates the average monthly humidity levels in Rio Dell, 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 Rio Dell is approximately 62%, 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 Rio Dell

In Rio Dell 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 Rio Dell.

Maximum UV Index Levels in Rio Dell for September

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

Data source: Rio Dell 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 Rio Dell Compares to Other Months

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

This table compares monthly weather conditions in Rio Dell, 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 (45°F)	214 mm (8.4 inches)	86%	moderate
February Weather	7°C (44°F)	201 mm (7.9 inches)	85%	moderate
March Weather	8°C (46°F)	177 mm (7.0 inches)	85%	high
April Weather	10°C (49°F)	101 mm (4.0 inches)	82%	very high
May Weather	12°C (53°F)	65 mm (2.6 inches)	81%	very high
June Weather	15°C (59°F)	16 mm (0.6 inches)	79%	extreme
July Weather	17°C (62°F)	2 mm (0.1 inches)	70%	very high
August Weather	18°C (64°F)	1 mm (0.0 inches)	60%	very high
September Weather	16°C (61°F)	23 mm (0.9 inches)	62%	very high
October Weather	13°C (55°F)	59 mm (2.3 inches)	72%	high
November Weather	9°C (49°F)	128 mm (5.1 inches)	87%	moderate
December Weather	6°C (44°F)	155 mm (6.1 inches)	86%	low