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September Weather in Stewart, United States

Last updated: June 24, 2025

In September, the average temperature in Stewart, United States is a pleasant 18°C (64°F). Expect a minimum chill of 1°C (34°F) and the occasional warm day reaching up to 33°C (92°F). With an average humidity of 81%, be prepared for a bit of moisture in the air. Travelers should anticipate about 112 mm (4.4 in) of precipitation spread over 10 days during this month.

September Temperature in Stewart

In September in Stewart, the average temperature is 18°C (64°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of temperatures, making it an ideal time for exploring the great outdoors.

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

The chart illustrates September temperature patterns in Stewart, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stewart, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec151532435972747064483323
Data source: Temperature data for Stewart 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 Stewart

In Stewart in September, the total precipitation amount is 112 mm (4.4 in) over the course of 10 days.

September Precipitation Trends in Stewart

The chart displays monthly precipitation patterns in Stewart, 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 Stewart, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec2426577711798110142112972939
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stewart

In Stewart in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Stewart

This chart illustrates the average monthly humidity levels in Stewart, 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 Stewart is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stewart

In Stewart in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Stewart.

Maximum UV Index Levels in Stewart for September

The chart shows the monthly maximum UV Index (UVI) for Stewart 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 Stewart typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3557910997532
Data source: Stewart 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 Stewart Compares to Other Months

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

This table compares monthly weather conditions in Stewart, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)24 mm (0.9 inches)87%moderate
February Weather-9°C (15°F)26 mm (1.0 inches)90%moderate
March Weather0°C (32°F)57 mm (2.2 inches)85%moderate
April Weather6°C (43°F)77 mm (3.0 inches)84%high
May Weather15°C (59°F)117 mm (4.6 inches)78%very high
June Weather22°C (72°F)98 mm (3.8 inches)80%very high
July Weather23°C (74°F)110 mm (4.3 inches)81%very high
August Weather21°C (70°F)142 mm (5.6 inches)81%very high
September Weather18°C (64°F)112 mm (4.4 inches)81%high
October Weather9°C (48°F)97 mm (3.8 inches)84%moderate
November Weather1°C (33°F)29 mm (1.1 inches)88%moderate
December Weather-5°C (23°F)39 mm (1.6 inches)84%low

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