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September Weather in Saint Paul, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Paul, United States hovers around 20°C (68°F), with a minimum dipping to 5°C (41°F) and a maximum soaring to 32°C (90°F). Expect 118 mm (4.6 in) of precipitation spread over 11 days, accompanied by an average humidity of 68%.

September Temperature in Saint Paul

In September in Saint Paul, the average temperature is 20°C (68°F). Maximums can reach 32°C (90°F), and minimums can dip as low as 5°C (41°F). This variety in temperatures makes it a great time for travelers to enjoy both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Saint Paul, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Paul, September typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec364146546469737167584440
Data source: Temperature data for Saint Paul 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 Paul

In Saint Paul in September, the precipitation amount is 118 mm (4.6 in) over the course of 11 days.

September Precipitation Trends in Saint Paul

The chart displays monthly precipitation patterns in Saint Paul, 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 Paul, September typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9116412615512914911413111812877122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Paul

In Saint Paul in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Saint Paul

This chart illustrates the average monthly humidity levels in Saint Paul, 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 Paul is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Paul

In Saint Paul 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 Paul.

Maximum UV Index Levels in Saint Paul for September

The chart shows the monthly maximum UV Index (UVI) for Saint Paul 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 Paul typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Saint Paul 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 Paul Compares to Other Months

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

This table compares monthly weather conditions in Saint Paul, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)91 mm (3.6 inches)87%moderate
February Weather5°C (42°F)164 mm (6.4 inches)87%high
March Weather8°C (47°F)126 mm (5.0 inches)86%very high
April Weather12°C (54°F)155 mm (6.1 inches)84%very high
May Weather18°C (64°F)129 mm (5.1 inches)83%extreme
June Weather21°C (69°F)149 mm (5.8 inches)83%extreme
July Weather23°C (73°F)114 mm (4.5 inches)79%extreme
August Weather22°C (71°F)131 mm (5.1 inches)66%very high
September Weather20°C (68°F)118 mm (4.6 inches)68%very high
October Weather14°C (58°F)127 mm (5.0 inches)78%high
November Weather7°C (44°F)77 mm (3.0 inches)89%moderate
December Weather4°C (40°F)122 mm (4.8 inches)86%moderate

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