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September Weather in Saint Paul, United States

Last updated: June 24, 2025

In Saint Paul, United States, the average temperature in September hovers around 23°C (74°F), with extremes ranging from a chilly 7°C (45°F) to a warm 34°C (94°F). Expect about 82 mm (3.2 in) of precipitation spread across 7 days, and a comfortable average humidity level of 67%. Enjoy the pleasant weather as you explore this beautiful destination!

September Temperature in Saint Paul

In September, in Saint Paul, the average temperature is 23°C (74°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 7°C (45°F). This makes Saint Paul an ideal destination for travelers seeking a mix of 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 23°C (74°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec353750576878817974604741
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 82 mm (3.2 in) over the course 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 82 mm (3.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6258113114230108104126821334335
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 67%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, making outdoor exploration pleasant yet slightly sticky, perfect for leisurely strolls but requiring occasional breaks for hydration.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35710101111109753
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)62 mm (2.4 inches)77%moderate
February Weather3°C (37°F)58 mm (2.3 inches)76%moderate
March Weather10°C (50°F)113 mm (4.4 inches)71%high
April Weather14°C (57°F)114 mm (4.5 inches)73%very high
May Weather20°C (68°F)230 mm (9.1 inches)83%very high
June Weather26°C (78°F)108 mm (4.2 inches)83%extreme
July Weather27°C (81°F)104 mm (4.1 inches)81%extreme
August Weather26°C (79°F)126 mm (5.0 inches)73%very high
September Weather23°C (74°F)82 mm (3.2 inches)67%very high
October Weather15°C (60°F)133 mm (5.2 inches)72%high
November Weather8°C (47°F)43 mm (1.7 inches)82%moderate
December Weather5°C (42°F)35 mm (1.4 inches)85%moderate

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