nomadseason

September Weather in Plains, United States

Last updated: June 24, 2025

In September, the average temperature in Plains, United States reaches a pleasant 23°C (74°F). However, you can expect a range, with minimums dipping to 2°C (37°F) and maximums soaring to 38°C (100°F). During this time, rainfall totals around 44 mm (1.7 in) spread over 7 days, accompanied by an average humidity level of 71%.

September Temperature in Plains

In September in Plains, the average temperature is 23°C (74°F). The maximum can reach 38°C (100°F), and the minimum can be as low as 2°C (37°F). This variability in temperatures makes Plains an exciting destination for travelers seeking both warmth and the potential for cooler evenings.

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 (74°F), with highs reaching up to 38°C (100°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414555627279818073615145
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 44 mm (1.7 in) spread over a duration 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 44 mm (1.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec181134174146243944461811
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 71%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace that can make outdoor activities feel sticky, but if you're well-hydrated and take breaks in the shade, it offers a pleasant tropical ambiance perfect for exploration.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%75%61%61%67%69%69%66%71%71%82%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121210864
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 Weather5°C (42°F)18 mm (0.7 inches)75%moderate
February Weather7°C (45°F)11 mm (0.4 inches)74%high
March Weather13°C (55°F)34 mm (1.3 inches)61%very high
April Weather17°C (62°F)17 mm (0.7 inches)61%extreme
May Weather22°C (72°F)41 mm (1.6 inches)67%extreme
June Weather26°C (79°F)46 mm (1.8 inches)69%extreme
July Weather27°C (81°F)24 mm (0.9 inches)69%extreme
August Weather27°C (80°F)39 mm (1.5 inches)66%extreme
September Weather23°C (74°F)44 mm (1.7 inches)71%very high
October Weather16°C (62°F)46 mm (1.8 inches)71%very high
November Weather11°C (51°F)18 mm (0.7 inches)82%high
December Weather7°C (45°F)11 mm (0.4 inches)80%moderate

Compare Plains's Climate with Cities Worldwide