nomadseason

September Weather in Saint Paul, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Paul, United States hovers around 26°C (79°F). Expect a minimum of 10°C (51°F) and a maximum soaring to 37°C (99°F). With an average humidity of 65%, you'll feel comfortably warm despite experiencing around 89 mm (3.5 in) of precipitation spread over 8 days.

September Temperature in Saint Paul

In September in Saint Paul, the average temperature is 26°C (79°F). Maximum temperatures can reach 37°C (99°F), while minimums can dip as low as 10°C (51°F). It's a great time to explore Saint Paul with a mix of warm days and cooler evenings.

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 26°C (79°F), with highs reaching up to 37°C (99°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec464960657481848479675651
Data source: Temperature data for Saint Paul generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 89 mm (3.5 in) over a span of 8 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 89 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec64111121138181915595891485873
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Saint Paul

In Saint Paul in September, humidity is 65%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making travel quite sticky and uncomfortable.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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 Weather8°C (47°F)64 mm (2.5 inches)80%moderate
February Weather9°C (49°F)111 mm (4.4 inches)79%high
March Weather15°C (60°F)121 mm (4.8 inches)78%very high
April Weather18°C (65°F)138 mm (5.4 inches)78%very high
May Weather23°C (74°F)180 mm (7.1 inches)81%extreme
June Weather27°C (81°F)91 mm (3.6 inches)78%extreme
July Weather29°C (85°F)55 mm (2.2 inches)73%extreme
August Weather29°C (84°F)95 mm (3.7 inches)66%extreme
September Weather26°C (79°F)89 mm (3.5 inches)65%very high
October Weather20°C (68°F)148 mm (5.8 inches)72%very high
November Weather13°C (56°F)58 mm (2.3 inches)82%high
December Weather11°C (51°F)73 mm (2.9 inches)87%moderate

Compare Saint Paul's Climate with Cities Worldwide