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September Weather in Highlands Ranch, United States

Last updated: June 24, 2025

In September, the average temperature in Highlands Ranch, United States is a comfortable 17°C (64°F), with a minimum dropping to -2°C (28°F) and a maximum soaring up to 35°C (95°F). Expect about 36 mm (1.4 in) of precipitation over 6 days, and enjoy the fresh air with an average humidity of 65%.

September Temperature in Highlands Ranch

In September in Highlands Ranch, the average temperature is 17°C (64°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as -2°C (28°F). Be prepared for a wide range of temperatures during your travels, and pack accordingly to enjoy your time in Highlands Ranch.

September Weather in Highlands Ranch: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Highlands Ranch, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Highlands Ranch, September typically has an average temperature of 17°C (64°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec272736435365716963463830
Data source: Temperature data for Highlands Ranch 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 Highlands Ranch

In Highlands Ranch in September, the total precipitation amount is 36 mm (1.4 in), which falls over the course of 6 days.

September Precipitation Trends in Highlands Ranch

The chart displays monthly precipitation patterns in Highlands Ranch, 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 Highlands Ranch, September typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2328645711856573736382314
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Highlands Ranch

In Highlands Ranch in September, humidity is 65%. With an average temperature of 17°C (64°F), this humidity feels like a warm embrace, creating an atmosphere that can be both refreshing and slightly sticky, making exploring the sights a balance of comfort and occasional perspiration.

September Average Humidity in Highlands Ranch

This chart illustrates the average monthly humidity levels in Highlands Ranch, 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 Highlands Ranch is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Highlands Ranch

In Highlands Ranch 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 Highlands Ranch.

Maximum UV Index Levels in Highlands Ranch for September

The chart shows the monthly maximum UV Index (UVI) for Highlands Ranch 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 Highlands Ranch typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111212121110754
Data source: Highlands Ranch 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 Highlands Ranch Compares to Other Months

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

This table compares monthly weather conditions in Highlands Ranch, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)23 mm (0.9 inches)88%moderate
February Weather-3°C (27°F)28 mm (1.1 inches)87%high
March Weather2°C (37°F)64 mm (2.5 inches)81%very high
April Weather6°C (44°F)57 mm (2.2 inches)76%extreme
May Weather11°C (53°F)118 mm (4.6 inches)66%extreme
June Weather19°C (66°F)56 mm (2.2 inches)58%extreme
July Weather21°C (71°F)57 mm (2.2 inches)52%extreme
August Weather21°C (69°F)37 mm (1.4 inches)56%extreme
September Weather17°C (64°F)36 mm (1.4 inches)65%very high
October Weather8°C (47°F)38 mm (1.5 inches)76%high
November Weather3°C (38°F)23 mm (0.9 inches)82%moderate
December Weather-1°C (31°F)14 mm (0.6 inches)89%moderate

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