September Weather in Saint Francis, United States

Last updated: June 24, 2025

In Saint Francis, United States, the average temperature in September is a pleasant 21°C (70°F). However, be prepared for a range that can dip to a chilly 2°C (35°F) and soar to a sweltering 39°C (102°F). During this month, expect about 42 mm (1.7 in) of precipitation over 4 days, combined with an average humidity of 82%, making for a warm and potentially humid experience.

September Temperature in Saint Francis

In September in Saint Francis, the average temperature is 21°C (70°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop to as low as 2°C (35°F). Travelers should be prepared for a wide range of temperatures during their visit to Saint Francis in September.

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 21°C (70°F), with highs reaching up to 39°C (102°F) and lows dropping to around 2°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 42 mm (1.7 in) distributed over a span of 4 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 42 mm (1.7 inches) of precipitation spread over approximately 4 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 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

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 82%, 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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, 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	0°C (32°F)	18 mm (0.7 inches)	74%	moderate
February Weather	-1°C (31°F)	15 mm (0.6 inches)	78%	moderate
March Weather	6°C (44°F)	56 mm (2.2 inches)	66%	high
April Weather	10°C (51°F)	41 mm (1.6 inches)	66%	very high
May Weather	16°C (61°F)	104 mm (4.1 inches)	83%	very high
June Weather	23°C (74°F)	53 mm (2.1 inches)	83%	extreme
July Weather	25°C (78°F)	57 mm (2.3 inches)	83%	extreme
August Weather	24°C (75°F)	54 mm (2.1 inches)	86%	very high
September Weather	21°C (70°F)	42 mm (1.7 inches)	82%	very high
October Weather	11°C (52°F)	36 mm (1.4 inches)	75%	high
November Weather	6°C (44°F)	14 mm (0.5 inches)	77%	moderate
December Weather	2°C (36°F)	15 mm (0.6 inches)	82%	moderate