nomadseason

September Weather in Fossil, United States

Last updated: June 24, 2025

In Fossil, United States, the average temperature in September hovers around 17°C (63°F). Temperatures can range from a brisk 2°C (35°F) to a sizzling 37°C (99°F). Expect some light rain with an average precipitation of 21 mm (0.8 in) over 4 days. With an average humidity of 59%, the climate is comfortably mild, making it a great time to explore!

September Temperature in Fossil

In September, in Fossil, the average temperature is 17°C (63°F). The maximum can reach 37°C (99°F) and the minimum can be as low as 2°C (35°F). It's advisable to pack for both warm days and cool nights while traveling here during this time.

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

The chart illustrates September temperature patterns in Fossil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fossil, September typically has an average temperature of 17°C (63°F), with highs reaching up to 37°C (99°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec333441485765747363504134
Data source: Temperature data for Fossil generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Fossil

In Fossil in September, the precipitation amount is 21 mm (0.8 in) over a span of 4 days.

September Precipitation Trends in Fossil

The chart displays monthly precipitation patterns in Fossil, 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 Fossil, September typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec5168515133171721355254
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Fossil

In Fossil in September, humidity is 59%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you're prepared for occasional mugginess.

September Average Humidity in Fossil

This chart illustrates the average monthly humidity levels in Fossil, 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 Fossil is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%85%80%82%79%63%59%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fossil

In Fossil 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 Fossil.

Maximum UV Index Levels in Fossil for September

The chart shows the monthly maximum UV Index (UVI) for Fossil 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 Fossil typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101098532
Data source: Fossil 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 Fossil Compares to Other Months

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

This table compares monthly weather conditions in Fossil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)51 mm (2.0 inches)86%low
February Weather1°C (35°F)68 mm (2.7 inches)87%moderate
March Weather5°C (41°F)51 mm (2.0 inches)86%high
April Weather9°C (48°F)51 mm (2.0 inches)85%high
May Weather14°C (57°F)33 mm (1.3 inches)80%very high
June Weather19°C (66°F)17 mm (0.7 inches)82%very high
July Weather23°C (74°F)1 mm (0.0 inches)78%very high
August Weather23°C (74°F)7 mm (0.3 inches)62%very high
September Weather17°C (63°F)21 mm (0.8 inches)59%very high
October Weather10°C (50°F)35 mm (1.4 inches)78%moderate
November Weather5°C (41°F)52 mm (2.0 inches)88%moderate
December Weather1°C (34°F)54 mm (2.1 inches)88%low

Compare Fossil's Climate with Cities Worldwide