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September Weather in American Fork, United States

Last updated: June 24, 2025

In September, the average temperature in American Fork, United States is a comfortable 17°C (62°F). However, be prepared for some fluctuations, as temperatures can dip to as low as -5°C (23°F) and soar up to 34°C (93°F). Expect a bit of rain with an average precipitation of 35 mm (1.4 in) spread over 5 days. The average humidity sits at a moderate 46%, making it a pleasant time to visit!

September Temperature in American Fork

In September in American Fork, the average temperature is 17°C (62°F). Maximums can reach 34°C (93°F) while minimums can drop as low as -5°C (23°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

September Weather in American Fork: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in American Fork, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In American Fork, September typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec242735415166747262453524
Data source: Temperature data for American Fork 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 American Fork

In American Fork in September, the precipitation amount is 35 mm (1.4 in) over a span of 5 days.

September Precipitation Trends in American Fork

The chart displays monthly precipitation patterns in American Fork, 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 American Fork, September typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec707774686421202735454560
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in American Fork

In American Fork in September, humidity is 46%. With an average temperature of 17°C (62°F), this humidity feels like a refreshing breeze, making it comfortable for exploring the local attractions and enjoying outdoor activities.

September Average Humidity in American Fork

This chart illustrates the average monthly humidity levels in American Fork, 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 American Fork is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%84%75%62%56%44%37%46%67%84%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in American Fork

In American Fork 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 American Fork.

Maximum UV Index Levels in American Fork for September

The chart shows the monthly maximum UV Index (UVI) for American Fork 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 American Fork typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46911111212119753
Data source: American Fork 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 American Fork Compares to Other Months

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

This table compares monthly weather conditions in American Fork, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)70 mm (2.8 inches)91%moderate
February Weather-3°C (27°F)77 mm (3.0 inches)92%high
March Weather2°C (35°F)74 mm (2.9 inches)84%very high
April Weather5°C (42°F)68 mm (2.7 inches)74%extreme
May Weather11°C (51°F)64 mm (2.5 inches)62%extreme
June Weather19°C (66°F)21 mm (0.8 inches)56%extreme
July Weather24°C (75°F)20 mm (0.8 inches)44%extreme
August Weather22°C (72°F)27 mm (1.1 inches)37%extreme
September Weather17°C (62°F)35 mm (1.4 inches)46%very high
October Weather7°C (45°F)45 mm (1.8 inches)67%high
November Weather2°C (35°F)45 mm (1.8 inches)84%moderate
December Weather-4°C (24°F)60 mm (2.3 inches)88%moderate

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