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September Weather in Saint Ignatius, United States

Last updated: June 24, 2025

In Saint Ignatius, United States, the average temperature in September hovers around 13°C (55°F). Expect chilly nights with minimums dropping to -3°C (27°F), while warm days can peak at 31°C (89°F). With an average humidity of 67% and precipitation of 45 mm (1.8 in) occurring over approximately 8 days, it's a month of intriguing weather dynamics.

September Temperature in Saint Ignatius

In September in Saint Ignatius, the average temperature is 13°C (55°F). Maximums can reach 31°C (89°F) and minimums can be as low as -3°C (27°F). Be prepared for a wide range of temperatures if you're planning to visit during this time.

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

The chart illustrates September temperature patterns in Saint Ignatius, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Ignatius, September typically has an average temperature of 13°C (55°F), with highs reaching up to 31°C (89°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec232031384957676555403226
Data source: Temperature data for Saint Ignatius 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 Ignatius

In Saint Ignatius in September, the precipitation amount is 45 mm (1.8 in) over the course of 8 days.

September Precipitation Trends in Saint Ignatius

The chart displays monthly precipitation patterns in Saint Ignatius, 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 Ignatius, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec6311470979784213145889484
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Ignatius

In Saint Ignatius in September humidity is 67%. With an average temperature of 13°C (55°F), this humidity feels like a chilly embrace, making travel a bit uncomfortable as the cool air settles in.

September Average Humidity in Saint Ignatius

This chart illustrates the average monthly humidity levels in Saint Ignatius, 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 Ignatius is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%85%80%78%77%66%67%77%89%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Ignatius

In Saint Ignatius 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 Ignatius.

Maximum UV Index Levels in Saint Ignatius for September

The chart shows the monthly maximum UV Index (UVI) for Saint Ignatius 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 Ignatius typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101098532
Data source: Saint Ignatius 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 Ignatius Compares to Other Months

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

This table compares monthly weather conditions in Saint Ignatius, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)63 mm (2.5 inches)93%low
February Weather-7°C (20°F)114 mm (4.5 inches)92%moderate
March Weather0°C (31°F)70 mm (2.8 inches)89%high
April Weather3°C (38°F)97 mm (3.8 inches)85%high
May Weather9°C (49°F)97 mm (3.8 inches)80%very high
June Weather14°C (58°F)84 mm (3.3 inches)78%very high
July Weather19°C (67°F)21 mm (0.8 inches)77%very high
August Weather18°C (65°F)31 mm (1.2 inches)66%very high
September Weather13°C (55°F)45 mm (1.8 inches)67%very high
October Weather5°C (41°F)88 mm (3.5 inches)77%moderate
November Weather0°C (32°F)94 mm (3.7 inches)89%moderate
December Weather-3°C (26°F)84 mm (3.3 inches)95%low

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