September Weather in Saint Francis, United States

Last updated: June 24, 2025

In Saint Francis, United States, the average temperature in September reaches a comfortable 17°C (63°F). However, temperatures can vary significantly, dipping to a chilly 1°C (33°F) at night and soaring up to a warm 32°C (90°F) during the day. The month sees 108 mm (4.3 in) of precipitation over approximately 11 days, contributing to a relatively high average humidity of 81%.

September Temperature in Saint Francis

In September in Saint Francis, the average temperature is 17°C (63°F), with maximums reaching as high as 32°C (90°F) and minimums dropping to as low as 1°C (33°F). This variation makes it an ideal time for travelers to enjoy a range of outdoor activities, from warm sunny days to cooler evenings.

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 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (33°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 108 mm (4.3 in) over the course of 11 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 108 mm (4.3 inches) of precipitation spread over approximately 11 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 Saint Francis

In Saint Francis in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

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 81%, 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 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 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 7, which falls under the 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	-9°C (15°F)	20 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	29 mm (1.1 inches)	90%	moderate
March Weather	0°C (32°F)	51 mm (2.0 inches)	85%	moderate
April Weather	6°C (42°F)	95 mm (3.7 inches)	84%	high
May Weather	15°C (58°F)	104 mm (4.1 inches)	78%	very high
June Weather	21°C (71°F)	74 mm (2.9 inches)	80%	very high
July Weather	23°C (74°F)	102 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	136 mm (5.3 inches)	81%	very high
September Weather	17°C (63°F)	108 mm (4.3 inches)	81%	high
October Weather	9°C (48°F)	105 mm (4.1 inches)	84%	moderate
November Weather	0°C (32°F)	34 mm (1.4 inches)	88%	moderate
December Weather	-6°C (22°F)	49 mm (1.9 inches)	84%	low