September Weather in Altamont, United States

Last updated: June 24, 2025

In September, the average temperature in Altamont, United States hovers around 18°C (64°F). Expect a minimum chill of 1°C (35°F) and warm highs reaching 32°C (91°F). During this month, you can anticipate 109 mm (4.3 in) of precipitation spread over about 9 days, accompanied by an average humidity level of 72%.

September Temperature in Altamont

In September in Altamont, the average temperature is 18°C (64°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as 1°C (35°F). Overall, it's a great time to visit Altamont, as you can experience a pleasant mix of warm and cooler days perfect for exploring.

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

The chart illustrates September temperature patterns in Altamont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altamont, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Altamont

In Altamont in September, the total precipitation amount is 109 mm (4.3 in) spread over 9 days.

September Precipitation Trends in Altamont

The chart displays monthly precipitation patterns in Altamont, 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 Altamont, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 9 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 Altamont

In Altamont in September, humidity is 72%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as the air clings to your skin, leaving you longing for a refreshing breeze.

September Average Humidity in Altamont

This chart illustrates the average monthly humidity levels in Altamont, 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 Altamont is approximately 72%, 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 Altamont

In Altamont 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 Altamont.

Maximum UV Index Levels in Altamont for September

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

Data source: Altamont 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 Altamont Compares to Other Months

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

This table compares monthly weather conditions in Altamont, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	73 mm (2.9 inches)	89%	moderate
February Weather	-2°C (29°F)	92 mm (3.6 inches)	88%	moderate
March Weather	2°C (35°F)	81 mm (3.2 inches)	86%	high
April Weather	8°C (47°F)	131 mm (5.2 inches)	84%	very high
May Weather	15°C (59°F)	106 mm (4.2 inches)	76%	very high
June Weather	20°C (68°F)	117 mm (4.6 inches)	72%	very high
July Weather	23°C (73°F)	152 mm (6.0 inches)	66%	very high
August Weather	22°C (71°F)	125 mm (4.9 inches)	64%	very high
September Weather	18°C (64°F)	109 mm (4.3 inches)	72%	high
October Weather	12°C (53°F)	148 mm (5.8 inches)	81%	high
November Weather	4°C (39°F)	96 mm (3.8 inches)	87%	moderate
December Weather	-1°C (31°F)	96 mm (3.8 inches)	84%	low