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September Weather in Excel, United States

Last updated: June 24, 2025

In Excel, United States, the average temperature in September hovers around 26°C (79°F), creating a warm atmosphere. However, temperatures can vary significantly, dipping to a minimum of 12°C (54°F) and soaring to a maximum of 39°C (103°F). Expect a total precipitation of 116 mm (4.6 in) over about 12 days, contributing to an average humidity of 79%.

September Temperature in Excel

In September in Excel, the average temperature is 26°C (79°F). Maximums can reach 39°C (103°F), while minimums can drop to as low as 12°C (54°F). Be prepared for warm days and cooler nights when traveling during this month.

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

The chart illustrates September temperature patterns in Excel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Excel, September typically has an average temperature of 26°C (79°F), with highs reaching up to 39°C (103°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec515762667579818178715754
Data source: Temperature data for Excel 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 Excel

In Excel in September, the precipitation amount is 116 mm (4.6 in) over a span of 12 days.

September Precipitation Trends in Excel

The chart displays monthly precipitation patterns in Excel, 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 Excel, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1071101101151111591371261169466141
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Excel

In Excel in September humidity is 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

September Average Humidity in Excel

This chart illustrates the average monthly humidity levels in Excel, 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 Excel is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%79%77%74%70%78%78%79%74%83%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Excel

In Excel 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 Excel.

Maximum UV Index Levels in Excel for September

The chart shows the monthly maximum UV Index (UVI) for Excel 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 Excel typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111111111110864
Data source: Excel 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 Excel Compares to Other Months

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

This table compares monthly weather conditions in Excel, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)106 mm (4.2 inches)83%moderate
February Weather14°C (57°F)110 mm (4.3 inches)82%high
March Weather17°C (62°F)110 mm (4.3 inches)79%very high
April Weather19°C (67°F)115 mm (4.5 inches)77%extreme
May Weather24°C (75°F)111 mm (4.4 inches)74%extreme
June Weather26°C (80°F)159 mm (6.3 inches)70%extreme
July Weather27°C (81°F)137 mm (5.4 inches)78%extreme
August Weather27°C (81°F)126 mm (4.9 inches)78%extreme
September Weather26°C (79°F)116 mm (4.6 inches)79%very high
October Weather22°C (71°F)94 mm (3.7 inches)74%very high
November Weather14°C (58°F)66 mm (2.6 inches)83%high
December Weather12°C (54°F)141 mm (5.6 inches)86%moderate

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