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September Weather in Saint Joseph, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Joseph, United States is a warm 27°C (80°F), with temperatures ranging from a cool 12°C (54°F) to a scorching 39°C (103°F). Expect about 88 mm (3.5 in) of precipitation spread across 10 days, contributing to an average humidity of 79%. Whether you're enjoying the sun or seeking shelter from the rain, be prepared for a typical balmy day!

September Temperature in Saint Joseph

In September, in Saint Joseph, the average temperature is 27°C (80°F). Maximums can reach up to 39°C (103°F), while minimums can drop to as low as 12°C (54°F). Be prepared for warm days and cooler nights when traveling during this time.

September Weather in Saint Joseph: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Joseph, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Joseph, September typically has an average temperature of 27°C (80°F), with highs reaching up to 39°C (103°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec505462667580838280705753
Data source: Temperature data for Saint Joseph 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 Saint Joseph

In Saint Joseph in September, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.

September Precipitation Trends in Saint Joseph

The chart displays monthly precipitation patterns in Saint Joseph, 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 Saint Joseph, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1171551201521331231081118811686118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Joseph

In Saint Joseph in September humidity is 79%. With an average temperature of 27°C (80°F), this humidity feels like walking through a warm, dense blanket, making travel feel sluggish and allowing every step to become noticeably heavier.

September Average Humidity in Saint Joseph

This chart illustrates the average monthly humidity levels in Saint Joseph, 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 Saint Joseph is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Joseph

In Saint Joseph 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 Saint Joseph.

Maximum UV Index Levels in Saint Joseph for September

The chart shows the monthly maximum UV Index (UVI) for Saint Joseph 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 Saint Joseph typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121110864
Data source: Saint Joseph 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 Saint Joseph Compares to Other Months

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

This table compares monthly weather conditions in Saint Joseph, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)117 mm (4.6 inches)83%moderate
February Weather12°C (55°F)154 mm (6.1 inches)83%high
March Weather17°C (63°F)120 mm (4.7 inches)80%very high
April Weather19°C (66°F)152 mm (6.0 inches)81%extreme
May Weather24°C (75°F)132 mm (5.2 inches)81%extreme
June Weather27°C (80°F)123 mm (4.9 inches)78%extreme
July Weather28°C (83°F)108 mm (4.3 inches)79%extreme
August Weather28°C (83°F)111 mm (4.4 inches)79%extreme
September Weather27°C (80°F)88 mm (3.5 inches)79%very high
October Weather21°C (70°F)116 mm (4.6 inches)77%very high
November Weather14°C (57°F)86 mm (3.4 inches)85%high
December Weather12°C (54°F)118 mm (4.7 inches)88%moderate

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