September Weather in Blackfoot, United States

Last updated: June 24, 2025

In September, the average temperature in Blackfoot, United States is a pleasant 17°C (63°F). However, temperatures can swing dramatically, ranging from a chilly 0°C (32°F) to a sweltering 36°C (97°F). Expect about 25 mm (1.0 in) of precipitation over 4 days, with an average humidity of 52% to keep the atmosphere comfortable.

September Temperature in Blackfoot

In September in Blackfoot, the average temperature is 17°C (63°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 0°C (32°F). This makes Blackfoot an ideal destination for travelers looking to enjoy a diverse climate during their visit.

September Weather in Blackfoot: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Blackfoot, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blackfoot, September typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (97°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Blackfoot

In Blackfoot in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Blackfoot

The chart displays monthly precipitation patterns in Blackfoot, 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 Blackfoot, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 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 Blackfoot

In Blackfoot in September, humidity is 52%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it comfortable for traveling as long as you stay hydrated and take short breaks to enjoy the scenery.

September Average Humidity in Blackfoot

This chart illustrates the average monthly humidity levels in Blackfoot, 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 Blackfoot is approximately 52%, 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 Blackfoot

In Blackfoot 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 Blackfoot.

Maximum UV Index Levels in Blackfoot for September

The chart shows the monthly maximum UV Index (UVI) for Blackfoot 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 Blackfoot typically reaches 9, which falls under the very high exposure category.

Data source: Blackfoot 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 Blackfoot Compares to Other Months

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

This table compares monthly weather conditions in Blackfoot, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	39 mm (1.5 inches)	95%	moderate
February Weather	-3°C (27°F)	50 mm (2.0 inches)	95%	moderate
March Weather	3°C (37°F)	44 mm (1.7 inches)	90%	high
April Weather	7°C (45°F)	51 mm (2.0 inches)	81%	very high
May Weather	12°C (55°F)	55 mm (2.2 inches)	71%	very high
June Weather	19°C (66°F)	28 mm (1.1 inches)	64%	extreme
July Weather	24°C (75°F)	12 mm (0.5 inches)	59%	extreme
August Weather	22°C (72°F)	15 mm (0.6 inches)	49%	very high
September Weather	17°C (63°F)	25 mm (1.0 inches)	52%	very high
October Weather	8°C (46°F)	37 mm (1.4 inches)	69%	high
November Weather	2°C (36°F)	29 mm (1.1 inches)	86%	moderate
December Weather	-3°C (26°F)	40 mm (1.6 inches)	91%	moderate