nomadseason

September Weather in Plains, United States

Last updated: June 24, 2025

In Plains, United States, the average temperature in September hovers around 23°C (73°F), offering a comfortable climate. However, be prepared for temperature fluctuations, as it can drop to a chilly 4°C (39°F) or soar to a sweltering 40°C (104°F). During this month, you can expect 37 mm (1.5 in) of precipitation over approximately 6 days, with an average humidity level of 79%. Perfect for those who enjoy a mix of sun and a sprinkle of rain!

September Temperature in Plains

In September in Plains, the average temperature is 23°C (73°F), with maximums reaching up to 40°C (104°F) and minimums dropping to as low as 4°C (39°F). This diverse temperature range makes it essential to pack accordingly for your travels, ensuring comfort no matter the weather.

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 23°C (73°F), with highs reaching up to 40°C (104°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec343548556576807873574638
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 37 mm (1.5 in) over the course of 6 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 37 mm (1.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1913634411153435337571026
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 79%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that clings to the skin, making travel feel both invigorating and slightly exhausting as the air wraps around you like a damp blanket.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%77%65%67%81%82%82%84%79%75%79%83%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111211119753
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 Weather1°C (34°F)19 mm (0.8 inches)74%moderate
February Weather2°C (35°F)13 mm (0.5 inches)77%high
March Weather9°C (48°F)63 mm (2.5 inches)65%high
April Weather13°C (55°F)43 mm (1.7 inches)67%very high
May Weather18°C (65°F)111 mm (4.4 inches)81%extreme
June Weather25°C (77°F)53 mm (2.1 inches)82%extreme
July Weather27°C (80°F)43 mm (1.7 inches)82%extreme
August Weather25°C (78°F)53 mm (2.1 inches)84%extreme
September Weather23°C (73°F)37 mm (1.5 inches)79%very high
October Weather14°C (57°F)57 mm (2.2 inches)75%high
November Weather8°C (46°F)10 mm (0.4 inches)79%moderate
December Weather3°C (38°F)26 mm (1.0 inches)83%moderate

Compare Plains's Climate with Cities Worldwide