nomadseason

September Weather in The Plains, United States

Last updated: June 24, 2025

In September, the average temperature in The Plains, United States hovers around 21°C (70°F). However, temperatures can vary significantly, dipping to a chilly 6°C (42°F) at their lowest and soaring up to a sweltering 36°C (98°F) at their peak. Expect approximately 96 mm (3.8 in) of precipitation over 8 days, while the average humidity lingers around 73%.

September Temperature in The Plains

In September in The Plains, the average temperature is 21°C (70°F), with maximums reaching 36°C (98°F) and minimums dipping as low as 6°C (42°F). Be sure to pack both light clothing and warmer layers to accommodate these temperature fluctuations during your travels.

September Weather in The Plains: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in The Plains, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In The Plains, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (98°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec343845546572777570594439
Data source: Temperature data for The Plains 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 The Plains

In The Plains in September, the precipitation amount is 96 mm (3.8 in) over the course of 8 days.

September Precipitation Trends in The Plains

The chart displays monthly precipitation patterns in The Plains, 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 The Plains, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec871231151341351451071229710683116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in The Plains

In The Plains in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in The Plains

This chart illustrates the average monthly humidity levels in The Plains, 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 The Plains 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 The Plains

In The Plains 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 The Plains.

Maximum UV Index Levels in The Plains for September

The chart shows the monthly maximum UV Index (UVI) for The Plains 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 The Plains typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: The Plains 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 The Plains Compares to Other Months

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

This table compares monthly weather conditions in The Plains, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)87 mm (3.4 inches)88%moderate
February Weather3°C (38°F)123 mm (4.8 inches)88%moderate
March Weather7°C (45°F)115 mm (4.5 inches)88%high
April Weather12°C (54°F)134 mm (5.3 inches)86%very high
May Weather18°C (65°F)135 mm (5.3 inches)82%very high
June Weather22°C (72°F)145 mm (5.7 inches)84%very high
July Weather25°C (77°F)107 mm (4.2 inches)82%very high
August Weather24°C (75°F)122 mm (4.8 inches)73%very high
September Weather21°C (70°F)96 mm (3.8 inches)73%very high
October Weather15°C (59°F)106 mm (4.2 inches)81%high
November Weather7°C (44°F)83 mm (3.3 inches)89%moderate
December Weather4°C (39°F)116 mm (4.6 inches)86%moderate

Compare The Plains's Climate with Cities Worldwide