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September Weather in Imperial, United States

Last updated: June 24, 2025

In September, the average temperature in Imperial, United States hovers around 20°C (68°F). Expect a range, with minimums dipping to 5°C (41°F) and maximums soaring to 34°C (94°F). Rainfall is moderate, with 122 mm (4.8 in) expected over about 9 days, contributing to an average humidity of 77%.

September Temperature in Imperial

In September in Imperial, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (94°F) and minimums can drop as low as 5°C (41°F). This varied climate makes it a great time for travelers to experience both warm days and cooler evenings, perfect for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Imperial, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Imperial, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec313541516270757368574236
Data source: Temperature data for Imperial 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 Imperial

In Imperial in September, the precipitation amount is 122 mm (4.8 in) over a span of 9 days.

September Precipitation Trends in Imperial

The chart displays monthly precipitation patterns in Imperial, 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 Imperial, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec92118104130136137137821221249299
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Imperial

In Imperial in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

September Average Humidity in Imperial

This chart illustrates the average monthly humidity levels in Imperial, 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 Imperial is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Imperial

In Imperial 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 Imperial.

Maximum UV Index Levels in Imperial for September

The chart shows the monthly maximum UV Index (UVI) for Imperial 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 Imperial typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Imperial 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 Imperial Compares to Other Months

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

This table compares monthly weather conditions in Imperial, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)92 mm (3.6 inches)88%moderate
February Weather1°C (35°F)118 mm (4.6 inches)88%moderate
March Weather5°C (42°F)104 mm (4.1 inches)87%high
April Weather11°C (52°F)130 mm (5.1 inches)87%very high
May Weather17°C (63°F)136 mm (5.4 inches)81%very high
June Weather21°C (70°F)137 mm (5.4 inches)83%very high
July Weather24°C (75°F)137 mm (5.4 inches)82%very high
August Weather23°C (73°F)82 mm (3.2 inches)76%very high
September Weather20°C (68°F)122 mm (4.8 inches)77%very high
October Weather14°C (57°F)123 mm (4.9 inches)82%high
November Weather6°C (42°F)92 mm (3.6 inches)89%moderate
December Weather2°C (36°F)99 mm (3.9 inches)86%low

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