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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 hovers around 17°C (63°F). Expect variations with a minimum of 0°C (33°F) and a peak reaching 32°C (89°F). During this time, the region experiences 115 mm (4.5 in) of precipitation spread over about 10 days, contributing to an average humidity of 81%.

September Temperature in Saint Joseph

In September in Saint Joseph, the average temperature is 17°C (63°F), with maximums reaching 32°C (89°F) and minimums dipping as low as 0°C (33°F). This varied climate makes it essential to pack for both warm and cool conditions when traveling to Saint Joseph 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 17°C (63°F), with highs reaching up to 32°C (89°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec141531415871737063463121
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 115 mm (4.5 in) over a span 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 115 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec192450819569981431151033045
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 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
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-10°C (15°F)19 mm (0.8 inches)87%low
February Weather-10°C (15°F)24 mm (1.0 inches)90%moderate
March Weather0°C (31°F)50 mm (2.0 inches)85%moderate
April Weather5°C (42°F)81 mm (3.2 inches)84%high
May Weather14°C (58°F)95 mm (3.7 inches)78%very high
June Weather21°C (71°F)69 mm (2.7 inches)80%very high
July Weather23°C (74°F)98 mm (3.9 inches)81%very high
August Weather21°C (70°F)143 mm (5.6 inches)81%very high
September Weather17°C (63°F)115 mm (4.5 inches)81%high
October Weather8°C (47°F)103 mm (4.1 inches)84%moderate
November Weather0°C (32°F)29 mm (1.2 inches)88%moderate
December Weather-6°C (22°F)45 mm (1.8 inches)84%low

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