nomadseason

September Weather in Junction City, United States

Last updated: June 24, 2025

In September, the average temperature in Junction City, United States is a pleasant 18°C (65°F). However, temperatures can vary significantly, ranging from a chilly 0°C (32°F) to a scorching 37°C (99°F). Visitors can expect about 14 mm (0.5 in) of precipitation over 3 days, with an average humidity of 62%.

September Temperature in Junction City

In September in Junction City, the average temperature is 18°C (65°F). Maximum temperatures can reach 37°C (99°F), while the minimum can drop as low as 0°C (32°F). It's advisable to pack layers to ensure comfort regardless of the temperature fluctuations during your travel.

September Weather in Junction City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Junction City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Junction City, September typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (99°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec373942485665747365544437
Data source: Temperature data for Junction City 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 Junction City

In Junction City in September, the precipitation amount is 14 mm (0.5 in) over the course of 3 days.

September Precipitation Trends in Junction City

The chart displays monthly precipitation patterns in Junction City, 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 Junction City, September typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec16715712880571524144999121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Junction City

In Junction City in September, humidity is 62%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet mildly sticky, perfect for leisurely strolls but a bit challenging for vigorous excursions.

September Average Humidity in Junction City

This chart illustrates the average monthly humidity levels in Junction City, 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 Junction City is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Junction City

In Junction City 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 Junction City.

Maximum UV Index Levels in Junction City for September

The chart shows the monthly maximum UV Index (UVI) for Junction City 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 Junction City typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
Data source: Junction City 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 Junction City Compares to Other Months

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

This table compares monthly weather conditions in Junction City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)167 mm (6.6 inches)86%moderate
February Weather4°C (39°F)157 mm (6.2 inches)85%moderate
March Weather5°C (42°F)128 mm (5.1 inches)85%high
April Weather9°C (49°F)80 mm (3.2 inches)82%very high
May Weather13°C (56°F)57 mm (2.2 inches)81%extreme
June Weather18°C (65°F)15 mm (0.6 inches)79%extreme
July Weather23°C (74°F)2 mm (0.1 inches)70%extreme
August Weather23°C (73°F)4 mm (0.2 inches)60%very high
September Weather18°C (65°F)14 mm (0.5 inches)62%very high
October Weather12°C (54°F)49 mm (1.9 inches)72%high
November Weather7°C (45°F)99 mm (3.9 inches)87%moderate
December Weather3°C (37°F)121 mm (4.8 inches)86%moderate

Compare Junction City's Climate with Cities Worldwide