nomadseason

September Weather in Napoleon, United States

Last updated: June 24, 2025

In September, the average temperature in Napoleon, United States is a comfortable 19°C (66°F). Expect temperatures to range from a chilly 2°C (36°F) at night up to a warm 33°C (92°F) during the day. With 74 mm (2.9 in) of precipitation spread over 8 days, it's wise to prepare for some rain. The average humidity sits at a brisk 80%, making the air feel a little more refreshing.

September Temperature in Napoleon

In September in Napoleon, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 2°C (36°F). This diverse climate makes Napoleon an ideal destination for travelers looking to experience a range of temperatures and activities.

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

The chart illustrates September temperature patterns in Napoleon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Napoleon, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec262737476070747265543932
Data source: Temperature data for Napoleon 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 Napoleon

In Napoleon in September, the precipitation amount is 74 mm (2.9 in) over a period of 8 days.

September Precipitation Trends in Napoleon

The chart displays monthly precipitation patterns in Napoleon, 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 Napoleon, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec656978921238410165741097554
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Napoleon

In Napoleon in September humidity is 80%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel more strenuous and sticky, which can ultimately dampen the experience of traveling.

September Average Humidity in Napoleon

This chart illustrates the average monthly humidity levels in Napoleon, 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 Napoleon is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Napoleon

In Napoleon 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 Napoleon.

Maximum UV Index Levels in Napoleon for September

The chart shows the monthly maximum UV Index (UVI) for Napoleon 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 Napoleon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24599101097542
Data source: Napoleon 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 Napoleon Compares to Other Months

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

This table compares monthly weather conditions in Napoleon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)65 mm (2.6 inches)88%low
February Weather-3°C (28°F)69 mm (2.7 inches)87%moderate
March Weather3°C (38°F)78 mm (3.1 inches)85%moderate
April Weather8°C (47°F)92 mm (3.6 inches)86%very high
May Weather15°C (60°F)123 mm (4.8 inches)80%very high
June Weather21°C (70°F)84 mm (3.3 inches)80%very high
July Weather24°C (75°F)101 mm (4.0 inches)80%very high
August Weather22°C (72°F)65 mm (2.6 inches)80%very high
September Weather19°C (66°F)74 mm (2.9 inches)80%high
October Weather12°C (54°F)109 mm (4.3 inches)84%moderate
November Weather4°C (39°F)75 mm (3.0 inches)89%moderate
December Weather0°C (33°F)54 mm (2.1 inches)86%low

Compare Napoleon's Climate with Cities Worldwide