September Weather in Rolla, United States

Last updated: June 24, 2025

In September, the average temperature in Rolla, United States is a comfortable 13°C (56°F). However, be prepared for a range of temperatures, as it can dip to a chilly -2°C (29°F) or soar up to a warm 31°C (87°F). With an average humidity of 73% and approximately 73 mm (2.9 in) of precipitation over 8 days, it's wise to expect a mix of sun and showers during your stay.

September Temperature in Rolla

In September in Rolla, the average temperature is 13°C (56°F). Maximum temperatures can reach 31°C (87°F), while the minimum can drop as low as -2°C (29°F). Be prepared for a range of weather conditions if you're traveling during this time.

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

The chart illustrates September temperature patterns in Rolla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rolla, September typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (87°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Rolla

In Rolla in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Rolla

The chart displays monthly precipitation patterns in Rolla, 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 Rolla, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 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 Rolla

In Rolla in September humidity is 73%. With an average temperature of 13°C (56°F), this humidity feels like a cool, damp embrace that can be quite refreshing yet may require a light jacket for comfort while exploring the outdoors.

September Average Humidity in Rolla

This chart illustrates the average monthly humidity levels in Rolla, 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 Rolla is approximately 73%, 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 Rolla

In Rolla 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 Rolla.

Maximum UV Index Levels in Rolla for September

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

Data source: Rolla 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 Rolla Compares to Other Months

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

This table compares monthly weather conditions in Rolla, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-13°C (8°F)	15 mm (0.6 inches)	92%	low
February Weather	-15°C (5°F)	16 mm (0.6 inches)	90%	moderate
March Weather	-5°C (24°F)	23 mm (0.9 inches)	88%	moderate
April Weather	2°C (36°F)	22 mm (0.9 inches)	81%	very high
May Weather	11°C (53°F)	42 mm (1.7 inches)	74%	very high
June Weather	18°C (65°F)	78 mm (3.1 inches)	72%	very high
July Weather	20°C (69°F)	59 mm (2.3 inches)	74%	very high
August Weather	18°C (65°F)	70 mm (2.8 inches)	76%	very high
September Weather	13°C (56°F)	73 mm (2.9 inches)	73%	high
October Weather	5°C (41°F)	51 mm (2.0 inches)	76%	moderate
November Weather	-4°C (24°F)	26 mm (1.0 inches)	86%	low
December Weather	-10°C (15°F)	23 mm (0.9 inches)	91%	low