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September Weather in Arapahoe, United States

Last updated: June 24, 2025

In Arapahoe, United States, the average temperature in September hovers around 21°C (70°F), with minimums dipping to 3°C (38°F) and maximums soaring to 36°C (98°F). During this month, expect about 61 mm (2.4 in) of precipitation spread over 5 days, contributing to an average humidity of 70%. Embrace the diverse weather that this month has to offer!

September Temperature in Arapahoe

In September in Arapahoe, the average temperature is 21°C (70°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 3°C (38°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

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

The chart illustrates September temperature patterns in Arapahoe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arapahoe, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (98°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec282842506175787569524233
Data source: Temperature data for Arapahoe 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 Arapahoe

In Arapahoe, in September, the precipitation amount is 61 mm (2.4 in) over the course of 5 days.

September Precipitation Trends in Arapahoe

The chart displays monthly precipitation patterns in Arapahoe, 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 Arapahoe, September typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2019743815257717161581732
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Arapahoe

In Arapahoe in September, humidity is 70%. With an average temperature of 21°C (70°F), this humidity feels like a warm, muggy embrace, making travel slightly uncomfortable, as the air clings to your skin and can leave you feeling sticky and in need of frequent breaks to cool down.

September Average Humidity in Arapahoe

This chart illustrates the average monthly humidity levels in Arapahoe, 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 Arapahoe is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Arapahoe

In Arapahoe 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 Arapahoe.

Maximum UV Index Levels in Arapahoe for September

The chart shows the monthly maximum UV Index (UVI) for Arapahoe 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 Arapahoe typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Arapahoe 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 Arapahoe Compares to Other Months

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

This table compares monthly weather conditions in Arapahoe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)20 mm (0.8 inches)73%moderate
February Weather-2°C (28°F)19 mm (0.8 inches)80%moderate
March Weather5°C (42°F)74 mm (2.9 inches)64%high
April Weather10°C (50°F)38 mm (1.5 inches)64%very high
May Weather16°C (61°F)152 mm (6.0 inches)76%very high
June Weather24°C (75°F)57 mm (2.2 inches)79%extreme
July Weather26°C (79°F)71 mm (2.8 inches)77%extreme
August Weather24°C (75°F)70 mm (2.8 inches)79%very high
September Weather21°C (70°F)61 mm (2.4 inches)70%very high
October Weather11°C (52°F)58 mm (2.3 inches)64%high
November Weather5°C (42°F)17 mm (0.7 inches)75%moderate
December Weather0°C (33°F)32 mm (1.2 inches)78%moderate

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