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September Weather in Stewartville, United States

Last updated: June 24, 2025

In Stewartville, United States, the average temperature in September is a pleasant 18°C (64°F), with minimums dipping to a chilly 1°C (34°F) and highs reaching up to a warm 32°C (91°F). Visitors can expect about 121 mm (4.8 in) of precipitation spread over 9 days, contributing to an average humidity of 75% that enhances the region's lush ambiance.

September Temperature in Stewartville

In September, in Stewartville, the average temperature is 18°C (64°F). Maximums can reach 32°C (91°F) and minimums can drop as low as 1°C (34°F). Travelers should be prepared for a range of temperatures, making layers a wise choice for their visit.

September Weather in Stewartville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Stewartville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stewartville, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec171734445970736964483425
Data source: Temperature data for Stewartville 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 Stewartville

In Stewartville in September, the precipitation amount is 121 mm (4.8 in) over the course of 9 days.

September Precipitation Trends in Stewartville

The chart displays monthly precipitation patterns in Stewartville, 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 Stewartville, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec36476185149134961061211155039
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stewartville

In Stewartville in September, humidity is 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

September Average Humidity in Stewartville

This chart illustrates the average monthly humidity levels in Stewartville, 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 Stewartville is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%80%81%74%81%80%77%75%80%87%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stewartville

In Stewartville 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 Stewartville.

Maximum UV Index Levels in Stewartville for September

The chart shows the monthly maximum UV Index (UVI) for Stewartville 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 Stewartville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35589101098532
Data source: Stewartville 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 Stewartville Compares to Other Months

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

This table compares monthly weather conditions in Stewartville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)36 mm (1.4 inches)82%moderate
February Weather-8°C (18°F)47 mm (1.9 inches)84%moderate
March Weather1°C (34°F)61 mm (2.4 inches)80%moderate
April Weather7°C (44°F)85 mm (3.4 inches)81%very high
May Weather15°C (59°F)149 mm (5.9 inches)74%very high
June Weather21°C (71°F)134 mm (5.3 inches)80%very high
July Weather23°C (73°F)96 mm (3.8 inches)80%very high
August Weather21°C (70°F)106 mm (4.2 inches)77%very high
September Weather18°C (64°F)121 mm (4.8 inches)75%very high
October Weather9°C (48°F)115 mm (4.5 inches)80%moderate
November Weather1°C (34°F)50 mm (2.0 inches)87%moderate
December Weather-4°C (25°F)39 mm (1.5 inches)83%low

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