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September Weather in Plains, United States

Last updated: June 24, 2025

In Plains, United States, the average temperature in September hovers around 13°C (55°F). However, don’t be surprised by the extremes, as temperatures can dip to a chilly -4°C (25°F) or rise to a balmy 32°C (90°F). Expect about 39 mm (1.5 in) of precipitation over 7 days, and enjoy the average humidity of 62% that accompanies this month’s weather!

September Temperature in Plains

In September in Plains, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -4°C (25°F). This temperature range suggests that travelers should prepare for both warm days and possibly chilly nights.

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

The chart illustrates September temperature patterns in Plains, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plains, September typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec252132395058676655413327
Data source: Temperature data for Plains 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 Plains

In Plains in September, the precipitation amount is 39 mm (1.5 in) over the course of 7 days.

September Precipitation Trends in Plains

The chart displays monthly precipitation patterns in 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 Plains, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6911172858260212739849188
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Plains

In Plains in September, humidity is 62%. With an average temperature of 13°C (55°F), this humidity feels like a cool, crisp embrace that can make outdoor activities refreshing yet somewhat damp, ideal for exploring but requiring a light jacket to stay comfortable.

September Average Humidity in Plains

This chart illustrates the average monthly humidity levels in 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 Plains is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Plains

In Plains 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 Plains.

Maximum UV Index Levels in Plains for September

The chart shows the monthly maximum UV Index (UVI) for 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 Plains typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
Data source: 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 Plains Compares to Other Months

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

This table compares monthly weather conditions in Plains, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)69 mm (2.7 inches)89%low
February Weather-6°C (22°F)111 mm (4.4 inches)89%moderate
March Weather0°C (32°F)72 mm (2.8 inches)87%high
April Weather4°C (39°F)85 mm (3.3 inches)84%high
May Weather10°C (50°F)82 mm (3.2 inches)77%very high
June Weather15°C (58°F)60 mm (2.4 inches)78%very high
July Weather20°C (68°F)21 mm (0.8 inches)77%very high
August Weather19°C (66°F)27 mm (1.1 inches)64%very high
September Weather13°C (55°F)39 mm (1.5 inches)62%high
October Weather5°C (41°F)83 mm (3.3 inches)79%moderate
November Weather0°C (33°F)91 mm (3.6 inches)87%moderate
December Weather-3°C (27°F)88 mm (3.5 inches)90%low

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