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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 21°C (70°F). You'll experience a range where the minimum dips to 6°C (43°F) and the maximum rises to 33°C (93°F). With an average precipitation of 78 mm (3.1 in) spread over about 7 days, expect moderate rain, complemented by an average humidity level of 69%. Plan accordingly for a mix of warm days and cooler evenings!

September Temperature in Saint Paul

In September in Saint Paul, the average temperature is 21°C (70°F). Maximums can reach 33°C (93°F), while minimums can dip as low as 6°C (43°F). It's an ideal time for travelers to enjoy a mix of warm days and cooler evenings, perfect for exploring the area comfortably.

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 21°C (70°F), with highs reaching up to 33°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec313543536573767470584237
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 total precipitation amount is 78 mm (3.1 in) over a duration of 7 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 78 mm (3.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec811031401131361151098878979796
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 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
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 Weather-1°C (31°F)81 mm (3.2 inches)87%moderate
February Weather1°C (35°F)103 mm (4.1 inches)85%moderate
March Weather6°C (44°F)140 mm (5.5 inches)86%high
April Weather12°C (53°F)113 mm (4.4 inches)84%very high
May Weather18°C (65°F)136 mm (5.4 inches)79%very high
June Weather23°C (73°F)114 mm (4.5 inches)82%extreme
July Weather25°C (77°F)109 mm (4.3 inches)79%very high
August Weather23°C (74°F)88 mm (3.5 inches)70%very high
September Weather21°C (70°F)78 mm (3.1 inches)69%very high
October Weather15°C (58°F)97 mm (3.8 inches)76%high
November Weather6°C (43°F)97 mm (3.8 inches)88%moderate
December Weather3°C (37°F)96 mm (3.8 inches)87%moderate

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