September Weather in Saint Francis, United States

Last updated: June 24, 2025

In Saint Francis, United States, the average temperature in September hovers around 18°C (65°F). However, be prepared for a range of conditions, as temperatures can dip to a chilly 1°C (35°F) or soar to a sizzling 38°C (101°F). During this month, expect about 59 mm (2.3 in) of precipitation over approximately 6 days. Additionally, the average humidity is a comfortable 72%, making it a dynamic time to experience the local climate.

September Temperature in Saint Francis

In September in Saint Francis, the average temperature is 18°C (65°F), with maximums reaching 38°C (101°F) and minimums dropping as low as 1°C (35°F). Travelers should prepare for a wide range of temperatures and pack accordingly.

September Weather in Saint Francis: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Francis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Francis, September typically has an average temperature of 18°C (65°F), with highs reaching up to 38°C (101°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Saint Francis

In Saint Francis in September, the precipitation amount is 59 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in Saint Francis

The chart displays monthly precipitation patterns in Saint Francis, 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 Saint Francis, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 6 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 Saint Francis

In Saint Francis in September humidity is 72%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace, making traveling somewhat uncomfortable as the air clings to your skin and the heat can be stifling, yet it's perfect for enjoying leisurely strolls under the shade.

September Average Humidity in Saint Francis

This chart illustrates the average monthly humidity levels in Saint Francis, 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 Saint Francis 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 Saint Francis

In Saint Francis 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 Saint Francis.

Maximum UV Index Levels in Saint Francis for September

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

Data source: Saint Francis 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 Saint Francis Compares to Other Months

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

This table compares monthly weather conditions in Saint Francis, 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 (25°F)	20 mm (0.8 inches)	74%	moderate
February Weather	-6°C (22°F)	23 mm (0.9 inches)	79%	moderate
March Weather	2°C (36°F)	61 mm (2.4 inches)	65%	high
April Weather	6°C (43°F)	62 mm (2.4 inches)	69%	very high
May Weather	13°C (56°F)	115 mm (4.5 inches)	75%	very high
June Weather	21°C (71°F)	61 mm (2.4 inches)	84%	extreme
July Weather	24°C (76°F)	72 mm (2.8 inches)	84%	very high
August Weather	22°C (72°F)	54 mm (2.1 inches)	83%	very high
September Weather	18°C (65°F)	59 mm (2.3 inches)	72%	very high
October Weather	8°C (47°F)	52 mm (2.0 inches)	68%	moderate
November Weather	3°C (38°F)	17 mm (0.7 inches)	75%	moderate
December Weather	-2°C (29°F)	32 mm (1.3 inches)	73%	moderate