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September Weather in Altamont, United States

Last updated: June 24, 2025

In Altamont, United States, the average temperature in September is a mild 16°C (61°F), with a wide range where it can dip to a chilly -1°C (31°F) or soar up to a hot 35°C (96°F). Expect around 25 mm (1.0 in) of precipitation over about 4 days, contributing to an average humidity of 57%. Whether you’re enjoying the cooler days or basking in the warmth, be prepared for a variety of weather!

September Temperature in Altamont

In September in Altamont, 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 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 16°C (61°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec333439455463717061493933
Data source: Temperature data for Altamont generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Altamont

In Altamont in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 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 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec7983715447176625396066
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Altamont

In Altamont in September, humidity is 57%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as the air maintains a comfortable balance, allowing for enjoyable exploration without feeling sticky or overly warm.

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 57%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%87%86%79%80%77%60%57%76%87%88%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3479111111109643
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)79 mm (3.1 inches)87%moderate
February Weather1°C (34°F)83 mm (3.3 inches)87%moderate
March Weather4°C (39°F)71 mm (2.8 inches)87%high
April Weather7°C (46°F)54 mm (2.1 inches)86%very high
May Weather12°C (54°F)46 mm (1.8 inches)79%extreme
June Weather17°C (63°F)17 mm (0.7 inches)80%extreme
July Weather22°C (72°F)6 mm (0.2 inches)77%extreme
August Weather21°C (71°F)6 mm (0.2 inches)60%very high
September Weather16°C (61°F)25 mm (1.0 inches)57%very high
October Weather9°C (49°F)39 mm (1.5 inches)76%high
November Weather4°C (40°F)60 mm (2.4 inches)87%moderate
December Weather1°C (33°F)66 mm (2.6 inches)88%moderate

Compare Altamont's Climate with Cities Worldwide