September Weather in De Smet, United States

Last updated: June 24, 2025

In September, the average temperature in De Smet, United States is a mild 17°C (64°F), with a range that can dip to a cool 2°C (35°F) or soar to a warm 33°C (92°F). Expect about 95 mm (3.7 in) of precipitation spread over 9 days, while the average humidity sits at a comfortable 77%. Enjoy the dynamic weather that this month brings!

September Temperature in De Smet

In September in De Smet, the average temperature is 17°C (64°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 2°C (35°F). Be prepared for a wide range of temperatures, making it essential to pack both light clothing for the warmer days and warmer layers for cooler evenings.

September Weather in De Smet: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in De Smet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In De Smet, September typically has an average temperature of 17°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in De Smet

In De Smet in September, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in De Smet

The chart displays monthly precipitation patterns in De Smet, 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 De Smet, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 9 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 De Smet

In De Smet in September, humidity is 77%. With an average temperature of 17°C (64°F), this humidity feels like a warm embrace, making traveling somewhat uncomfortable as the air can feel thick and heavy, causing sweat to linger on your skin and making you long for a refreshing breeze.

September Average Humidity in De Smet

This chart illustrates the average monthly humidity levels in De Smet, 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 De Smet is approximately 77%, 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 De Smet

In De Smet 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 De Smet.

Maximum UV Index Levels in De Smet for September

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

Data source: De Smet 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 De Smet Compares to Other Months

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

This table compares monthly weather conditions in De Smet, 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 (16°F)	20 mm (0.8 inches)	81%	moderate
February Weather	-9°C (16°F)	18 mm (0.7 inches)	85%	moderate
March Weather	0°C (32°F)	55 mm (2.2 inches)	76%	moderate
April Weather	5°C (42°F)	78 mm (3.1 inches)	79%	very high
May Weather	14°C (57°F)	87 mm (3.4 inches)	76%	very high
June Weather	21°C (71°F)	78 mm (3.1 inches)	81%	very high
July Weather	23°C (74°F)	91 mm (3.6 inches)	82%	very high
August Weather	21°C (71°F)	97 mm (3.8 inches)	82%	very high
September Weather	17°C (64°F)	95 mm (3.7 inches)	77%	very high
October Weather	8°C (46°F)	79 mm (3.1 inches)	76%	moderate
November Weather	1°C (34°F)	22 mm (0.9 inches)	84%	moderate
December Weather	-4°C (25°F)	30 mm (1.2 inches)	81%	low