September Weather in Ammon, United States

Last updated: June 24, 2025

In September, the average temperature in Ammon, United States hovers around 16°C (61°F). However, be prepared for a temperature range that can dip as low as -1°C (31°F) and soar to a steamy 35°C (96°F). Rainfall is relatively light, with 26 mm (1.0 in) expected over 4 days. On top of that, the average humidity is a comfortable 52%, making it a pleasant time to visit!

September Temperature in Ammon

In September in Ammon, the average temperature is 16°C (61°F). Maximum can reach 35°C (96°F) and minimum can be as low as -1°C (31°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates September temperature patterns in Ammon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ammon, September typically has an average temperature of 16°C (61°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Ammon

In Ammon in September, the precipitation amount is 26 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Ammon

The chart displays monthly precipitation patterns in Ammon, 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 Ammon, September typically receives around 26 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.

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Millimeters (mm) Inches (in)

September Humidity in Ammon

In Ammon in September, humidity is 52%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing yet slightly damp embrace, making it a comfortable climate for exploring outdoor attractions or leisurely strolls through the city.

September Average Humidity in Ammon

This chart illustrates the average monthly humidity levels in Ammon, 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 Ammon 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 Ammon

In Ammon 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 Ammon.

Maximum UV Index Levels in Ammon for September

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

Data source: Ammon 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 Ammon Compares to Other Months

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

This table compares monthly weather conditions in Ammon, 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)	40 mm (1.6 inches)	95%	moderate
February Weather	-3°C (27°F)	48 mm (1.9 inches)	95%	moderate
March Weather	3°C (37°F)	43 mm (1.7 inches)	90%	high
April Weather	7°C (45°F)	55 mm (2.2 inches)	81%	very high
May Weather	12°C (54°F)	58 mm (2.3 inches)	71%	very high
June Weather	18°C (65°F)	31 mm (1.2 inches)	64%	extreme
July Weather	23°C (74°F)	11 mm (0.4 inches)	59%	extreme
August Weather	21°C (71°F)	16 mm (0.6 inches)	49%	very high
September Weather	16°C (61°F)	26 mm (1.0 inches)	52%	very high
October Weather	7°C (45°F)	39 mm (1.5 inches)	69%	high
November Weather	2°C (36°F)	32 mm (1.3 inches)	86%	moderate
December Weather	-4°C (26°F)	41 mm (1.6 inches)	91%	moderate