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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 comfortable 22°C (71°F). However, be prepared for a range, as temperatures can dip to a chilly 6°C (44°F) at night and soar to a sweltering 35°C (95°F) during the day. With an average precipitation of 85 mm (3.4 in) over 8 days, and humidity levels at a moderate 72%, it's wise to pack accordingly!

September Temperature in Saint Joseph

In September in Saint Joseph, the average temperature is 22°C (71°F). The maximum can reach 35°C (95°F), while the minimum can drop as low as 6°C (44°F). This makes it an ideal destination for travelers seeking a warm climate with comfortable temperatures during the day and cooler evenings.

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 22°C (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec293045536577797671554336
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 85 mm (3.4 in) over the course of 8 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 85 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4634918218012997106851324737
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 72%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but potentially sticky, urging travelers to stay hydrated and take breaks in the shade.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather-2°C (29°F)46 mm (1.8 inches)80%moderate
February Weather-1°C (31°F)34 mm (1.3 inches)78%moderate
March Weather7°C (45°F)91 mm (3.6 inches)75%high
April Weather12°C (53°F)82 mm (3.2 inches)77%very high
May Weather18°C (65°F)180 mm (7.1 inches)82%very high
June Weather25°C (77°F)129 mm (5.1 inches)83%extreme
July Weather26°C (79°F)97 mm (3.8 inches)81%extreme
August Weather25°C (76°F)106 mm (4.2 inches)78%very high
September Weather22°C (71°F)85 mm (3.4 inches)72%very high
October Weather13°C (56°F)132 mm (5.2 inches)72%high
November Weather6°C (43°F)47 mm (1.8 inches)84%moderate
December Weather2°C (36°F)37 mm (1.4 inches)86%moderate

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