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September Weather in St. Paul, Canada

Last updated: June 18, 2025

In September, the average temperature in St. Paul, Canada hovers around 10°C (50°F), creating a refreshing yet varied climate. Temperatures can dip as low as -4°C (25°F) and soar up to 28°C (83°F), offering a wide range of weather experiences. Expect about 40 mm (1.6 in) of precipitation over 7 days, along with an average humidity level of 73%, making this month a unique blend of cool breezes and potential showers.

September Temperature in St. Paul

In September in St. Paul, the average temperature is 10°C (50°F). Maximums can reach 28°C (83°F), and minimums can be as low as -4°C (25°F). This variability makes it essential to pack for both warm and cold weather when traveling to St. Paul during this month.

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

The chart illustrates September temperature patterns in St. Paul, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Paul, September typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec9521345259636050362113
Data source: Temperature data for St. 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 St. Paul

In St. Paul in September, the precipitation amount is 40 mm (1.6 in) over a span of 7 days.

September Precipitation Trends in St. Paul

The chart displays monthly precipitation patterns in St. 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 St. Paul, September typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1716243346114975640303018
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St. Paul

In St. Paul in September, humidity is 73%. With an average temperature of 10°C (50°F), this humidity feels like a chilly, damp embrace, making it essential to layer your clothing while traveling, as the moisture in the air can quickly chill you to the bone.

September Average Humidity in St. Paul

This chart illustrates the average monthly humidity levels in St. 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 St. Paul is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%92%88%80%73%71%80%78%73%78%82%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St. Paul

In St. Paul in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in St. Paul, you can refer to this Hourly UV Index in St. Paul.

Maximum UV Index Levels in St. Paul for September

The chart shows the monthly maximum UV Index (UVI) for St. 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 St. Paul typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec134578876321
Data source: St. 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 St. Paul Compares to Other Months

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

This table compares monthly weather conditions in St. Paul, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-13°C (9°F)17 mm (0.7 inches)89%low
February Weather-15°C (5°F)16 mm (0.6 inches)92%moderate
March Weather-6°C (21°F)24 mm (0.9 inches)88%moderate
April Weather1°C (34°F)33 mm (1.3 inches)80%moderate
May Weather11°C (52°F)46 mm (1.8 inches)73%high
June Weather15°C (60°F)114 mm (4.5 inches)71%very high
July Weather17°C (63°F)97 mm (3.8 inches)80%very high
August Weather16°C (61°F)56 mm (2.2 inches)78%high
September Weather10°C (50°F)40 mm (1.6 inches)73%high
October Weather2°C (36°F)30 mm (1.2 inches)78%moderate
November Weather-6°C (21°F)29 mm (1.2 inches)82%low
December Weather-11°C (13°F)18 mm (0.7 inches)92%low

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