nomadseason

September Weather in Arapahoe, United States

Last updated: June 24, 2025

In Arapahoe, United States, the average temperature in September is a pleasant 25°C (77°F). However, don't be surprised if temperatures swing from a cool 12°C (55°F) to a balmy 33°C (92°F). Expect around 184 mm (7.2 in) of precipitation spread over 14 days, with a high average humidity of 80%. Whether you're basking in the sun or dodging the rain, be prepared for a bit of everything!

September Temperature in Arapahoe

In September in Arapahoe, the average temperature is 25°C (77°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 12°C (55°F). Overall, it’s a great time to visit Arapahoe for warm weather and pleasant days.

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 25°C (77°F), with highs reaching up to 33°C (92°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec475255637177818076685651
Data source: Temperature data for Arapahoe generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Arapahoe

In Arapahoe in September, the total precipitation amount is 184 mm (7.2 in) spread over 14 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 184 mm (7.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec73111721001161611651871847396130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Arapahoe

In Arapahoe in September humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%80%80%81%82%83%83%80%80%83%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109854
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 Weather8°C (47°F)73 mm (2.9 inches)84%moderate
February Weather11°C (52°F)111 mm (4.4 inches)81%high
March Weather13°C (55°F)72 mm (2.8 inches)80%very high
April Weather17°C (63°F)100 mm (3.9 inches)80%very high
May Weather22°C (71°F)116 mm (4.6 inches)81%extreme
June Weather25°C (77°F)161 mm (6.4 inches)82%extreme
July Weather27°C (81°F)165 mm (6.5 inches)83%extreme
August Weather27°C (80°F)187 mm (7.4 inches)82%very high
September Weather25°C (77°F)184 mm (7.2 inches)80%very high
October Weather20°C (69°F)73 mm (2.9 inches)79%very high
November Weather13°C (56°F)96 mm (3.8 inches)83%moderate
December Weather10°C (51°F)130 mm (5.1 inches)84%moderate

Compare Arapahoe's Climate with Cities Worldwide