nomadseason

September Weather in Plains, United States

Last updated: June 24, 2025

In Plains, United States, the average temperature in September hovers around 26°C (79°F). Expect a range from a cool 12°C (55°F) to a sizzling 37°C (99°F). During this month, precipitation totals about 105 mm (4.1 in) over approximately 10 days, accompanied by a high average humidity of 83%.

September Temperature in Plains

In September in Plains, the average temperature is 26°C (79°F). Maximums can reach 37°C (99°F) and minimums can be as low as 12°C (55°F). Travelers should be prepared for warm days and cooler evenings when visiting during this time.

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 26°C (79°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec505661667479818178705752
Data source: Temperature data for 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 Plains

In Plains in September, the precipitation amount is 105 mm (4.1 in) over the course of 10 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 105 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec97118941169110211311210511561132
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Plains

In Plains in September, humidity is 83%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making travel an exercise in endurance as the air clings to your skin and saps your energy.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
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 Weather10°C (50°F)97 mm (3.8 inches)85%moderate
February Weather13°C (56°F)118 mm (4.6 inches)82%high
March Weather16°C (61°F)94 mm (3.7 inches)80%very high
April Weather19°C (66°F)116 mm (4.6 inches)76%very high
May Weather23°C (74°F)91 mm (3.6 inches)73%extreme
June Weather26°C (79°F)102 mm (4.0 inches)74%extreme
July Weather27°C (82°F)113 mm (4.5 inches)80%extreme
August Weather27°C (81°F)112 mm (4.4 inches)79%extreme
September Weather26°C (79°F)105 mm (4.1 inches)83%very high
October Weather21°C (71°F)115 mm (4.5 inches)77%very high
November Weather14°C (57°F)61 mm (2.4 inches)84%high
December Weather11°C (53°F)132 mm (5.2 inches)88%moderate

Compare Plains's Climate with Cities Worldwide