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September Weather in Stapleton, United States

Last updated: June 24, 2025

In Stapleton, United States, the average temperature in September is a comfortable 19°C (66°F). However, temperatures can vary significantly, with a minimum of 1°C (34°F) and a maximum soaring to 36°C (97°F). Expect about 53 mm (2.1 in) of precipitation spread over 6 days, contributing to an average humidity level of 70%.

September Temperature in Stapleton

In September in Stapleton, the average temperature is 19°C (66°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 1°C (34°F). Visitors should be prepared for a wide range of temperatures, making it essential to pack both warm and cool clothing.

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

The chart illustrates September temperature patterns in Stapleton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stapleton, September typically has an average temperature of 19°C (66°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec262438465771757266483830
Data source: Temperature data for Stapleton 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 Stapleton

In Stapleton in September, the precipitation amount is 53 mm (2.1 in) over a span of 6 days.

September Precipitation Trends in Stapleton

The chart displays monthly precipitation patterns in Stapleton, 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 Stapleton, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1622704813080807253522631
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stapleton

In Stapleton in September humidity is 70%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket enveloping you, making travel a bit sticky and prompting frequent breaks for water as you explore the sights.

September Average Humidity in Stapleton

This chart illustrates the average monthly humidity levels in Stapleton, 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 Stapleton 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 Stapleton

In Stapleton 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 Stapleton.

Maximum UV Index Levels in Stapleton for September

The chart shows the monthly maximum UV Index (UVI) for Stapleton 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 Stapleton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568101111109643
Data source: Stapleton 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 Stapleton Compares to Other Months

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

This table compares monthly weather conditions in Stapleton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)16 mm (0.6 inches)73%moderate
February Weather-4°C (25°F)22 mm (0.9 inches)80%moderate
March Weather3°C (39°F)70 mm (2.7 inches)64%high
April Weather8°C (46°F)48 mm (1.9 inches)64%very high
May Weather14°C (58°F)130 mm (5.1 inches)76%very high
June Weather22°C (72°F)80 mm (3.1 inches)79%extreme
July Weather24°C (76°F)80 mm (3.1 inches)77%extreme
August Weather22°C (73°F)72 mm (2.8 inches)79%very high
September Weather19°C (66°F)53 mm (2.1 inches)70%very high
October Weather9°C (48°F)52 mm (2.1 inches)64%high
November Weather3°C (39°F)26 mm (1.0 inches)75%moderate
December Weather-1°C (30°F)31 mm (1.2 inches)78%moderate

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