September Weather in Saint Croix Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Croix Falls, United States hovers around 17°C (63°F). During this time, temperatures can dip as low as 1°C (34°F) or soar up to 32°C (90°F). Expect 102 mm (4.0 in) of precipitation spread over approximately 10 days, while the air carries an average humidity of 81%.

September Temperature in Saint Croix Falls

In September in Saint Croix Falls, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Saint Croix Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Croix Falls, 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 (34°F).

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

September Precipitation in Saint Croix Falls

In Saint Croix Falls in September, the total precipitation amount is 102 mm (4.0 in) falling over the course of 10 days.

September Precipitation Trends in Saint Croix Falls

The chart displays monthly precipitation patterns in Saint Croix Falls, 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 Croix Falls, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 10 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 Croix Falls

In Saint Croix Falls 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 Croix Falls

This chart illustrates the average monthly humidity levels in Saint Croix Falls, 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 Croix Falls 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 Croix Falls

In Saint Croix Falls 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 Croix Falls.

Maximum UV Index Levels in Saint Croix Falls for September

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

Data source: Saint Croix Falls 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 Croix Falls Compares to Other Months

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

This table compares monthly weather conditions in Saint Croix Falls, 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)	22 mm (0.9 inches)	87%	low
February Weather	-9°C (16°F)	33 mm (1.3 inches)	90%	moderate
March Weather	0°C (32°F)	50 mm (2.0 inches)	85%	moderate
April Weather	6°C (43°F)	89 mm (3.5 inches)	84%	high
May Weather	14°C (58°F)	117 mm (4.6 inches)	78%	very high
June Weather	21°C (70°F)	89 mm (3.5 inches)	80%	very high
July Weather	23°C (73°F)	101 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	126 mm (5.0 inches)	81%	very high
September Weather	17°C (63°F)	102 mm (4.0 inches)	81%	high
October Weather	9°C (48°F)	102 mm (4.0 inches)	84%	moderate
November Weather	0°C (32°F)	39 mm (1.5 inches)	88%	moderate
December Weather	-6°C (22°F)	54 mm (2.1 inches)	84%	low