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September Weather in Alta, United States

Last updated: June 24, 2025

In September, the average temperature in Alta, United States is a pleasant 19°C (67°F). Expect minimum temperatures to dip as low as 3°C (38°F), while maximums can soar to 34°C (93°F). Rain lovers will appreciate the 105 mm (4.1 in) of precipitation spread over 9 days, accompanied by an average humidity of 75%. Enjoy the diverse climate this month has to offer!

September Temperature in Alta

In September in Alta, the average temperature is 19°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (38°F). This climate makes it an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Alta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alta, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec212137466073757266503628
Data source: Temperature data for Alta 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 Alta

In Alta in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

September Precipitation Trends in Alta

The chart displays monthly precipitation patterns in Alta, 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 Alta, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec2640718814012766108105963441
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alta

In Alta in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Alta

This chart illustrates the average monthly humidity levels in Alta, 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 Alta is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%84%75%79%74%81%82%80%75%77%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alta

In Alta 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 Alta.

Maximum UV Index Levels in Alta for September

The chart shows the monthly maximum UV Index (UVI) for Alta 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 Alta typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35589111098533
Data source: Alta 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 Alta Compares to Other Months

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

This table compares monthly weather conditions in Alta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)26 mm (1.0 inches)80%moderate
February Weather-6°C (21°F)40 mm (1.6 inches)84%moderate
March Weather3°C (37°F)71 mm (2.8 inches)75%moderate
April Weather8°C (46°F)88 mm (3.5 inches)79%very high
May Weather16°C (60°F)140 mm (5.5 inches)74%very high
June Weather23°C (73°F)127 mm (5.0 inches)81%extreme
July Weather24°C (76°F)66 mm (2.6 inches)82%very high
August Weather22°C (72°F)108 mm (4.2 inches)80%very high
September Weather19°C (67°F)105 mm (4.1 inches)75%very high
October Weather10°C (50°F)96 mm (3.8 inches)77%moderate
November Weather2°C (36°F)34 mm (1.3 inches)85%moderate
December Weather-2°C (28°F)41 mm (1.6 inches)83%moderate

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