nomadseason

September Weather in Stephenville, United States

Last updated: June 24, 2025

In September, the average temperature in Stephenville, United States is a warm 26°C (79°F). While you can enjoy the pleasant warmth, be prepared for temperature variations, with a minimum of 8°C (47°F) and a maximum soaring to 38°C (101°F). During this month, expect about 86 mm (3.4 in) of precipitation spread over 8 days, contributing to an average humidity of 64%. A perfect blend of warmth and a few refreshing showers!

September Temperature in Stephenville

In September in Stephenville, the average temperature is 26°C (79°F). Maximum temperatures can reach as high as 38°C (101°F), while minimums can drop to as low as 8°C (47°F). Be prepared for warm days and cooler evenings when traveling to Stephenville during this month.

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

The chart illustrates September temperature patterns in Stephenville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stephenville, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec474960667482858578675651
Data source: Temperature data for Stephenville 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 Stephenville

In Stephenville in September, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 days.

September Precipitation Trends in Stephenville

The chart displays monthly precipitation patterns in Stephenville, 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 Stephenville, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec42708273109644373861003737
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Stephenville

In Stephenville in September, humidity is 64%. With an average temperature of 26°C (79°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as the air clings to your skin and the heat amplifies.

September Average Humidity in Stephenville

This chart illustrates the average monthly humidity levels in Stephenville, 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 Stephenville is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stephenville

In Stephenville in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Stephenville.

Maximum UV Index Levels in Stephenville for September

The chart shows the monthly maximum UV Index (UVI) for Stephenville 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 Stephenville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Stephenville 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 Stephenville Compares to Other Months

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

This table compares monthly weather conditions in Stephenville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)41 mm (1.6 inches)77%moderate
February Weather9°C (49°F)69 mm (2.7 inches)76%high
March Weather16°C (60°F)82 mm (3.2 inches)74%very high
April Weather19°C (66°F)73 mm (2.9 inches)75%very high
May Weather24°C (75°F)109 mm (4.3 inches)80%extreme
June Weather28°C (82°F)64 mm (2.5 inches)80%extreme
July Weather30°C (86°F)43 mm (1.7 inches)75%extreme
August Weather29°C (85°F)73 mm (2.9 inches)67%extreme
September Weather26°C (79°F)86 mm (3.4 inches)64%very high
October Weather20°C (67°F)100 mm (3.9 inches)70%very high
November Weather14°C (57°F)37 mm (1.5 inches)82%high
December Weather11°C (52°F)37 mm (1.5 inches)85%moderate

Compare Stephenville's Climate with Cities Worldwide