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September Weather in Mount Morris, United States

Last updated: June 24, 2025

In September, the average temperature in Mount Morris, United States hovers around 20°C (68°F), with fluctuations ranging from a brisk 5°C (41°F) to a warm 33°C (91°F). Prepare for 114 mm (4.5 in) of precipitation over about 10 days, while the average humidity sits at a comfortable 73%. Enjoy this blend of warmth and moisture as you explore!

September Temperature in Mount Morris

In September in Mount Morris, the average temperature is 20°C (68°F). Maximums can reach 33°C (91°F) and minimums can be as low as 5°C (41°F). Be prepared for a range of temperatures and pack accordingly to enjoy your travels!

September Weather in Mount Morris: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mount Morris, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Morris, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec323743536370747368584337
Data source: Temperature data for Mount Morris 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 Mount Morris

In Mount Morris in September, the precipitation amount is 114 mm (4.5 in) over a period of 10 days.

September Precipitation Trends in Mount Morris

The chart displays monthly precipitation patterns in Mount Morris, 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 Mount Morris, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8713411813515016913711211411686124
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mount Morris

In Mount Morris in September, humidity is 73%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities somewhat sticky, yet the atmosphere remains pleasant for leisurely strolls and sightseeing.

September Average Humidity in Mount Morris

This chart illustrates the average monthly humidity levels in Mount Morris, 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 Mount Morris is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mount Morris

In Mount Morris 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 Mount Morris.

Maximum UV Index Levels in Mount Morris for September

The chart shows the monthly maximum UV Index (UVI) for Mount Morris 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 Mount Morris typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
Data source: Mount Morris 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 Mount Morris Compares to Other Months

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

This table compares monthly weather conditions in Mount Morris, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)87 mm (3.4 inches)88%moderate
February Weather3°C (37°F)134 mm (5.3 inches)88%moderate
March Weather6°C (43°F)118 mm (4.6 inches)88%high
April Weather11°C (53°F)135 mm (5.3 inches)86%very high
May Weather17°C (63°F)150 mm (5.9 inches)82%very high
June Weather21°C (70°F)169 mm (6.6 inches)84%very high
July Weather24°C (75°F)137 mm (5.4 inches)82%very high
August Weather23°C (73°F)112 mm (4.4 inches)73%very high
September Weather20°C (68°F)114 mm (4.5 inches)73%very high
October Weather14°C (58°F)116 mm (4.6 inches)81%high
November Weather6°C (43°F)86 mm (3.4 inches)89%moderate
December Weather3°C (38°F)124 mm (4.9 inches)86%moderate

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