nomadseason

September Weather in Union City, United States

Last updated: June 24, 2025

The average temperature in Union City, United States during September is a warm 24°C (75°F). Expect temperatures to vary, with a minimum of 11°C (51°F) and a maximum reaching 36°C (96°F). This month also brings 111 mm (4.4 in) of precipitation over 8 days, contributing to an average humidity level of 82%.

September Temperature in Union City

In September in Union City, the average temperature is 24°C (75°F). Maximums can reach 36°C (96°F) and minimums can be as low as 11°C (51°F). It's an ideal time for travelers to enjoy a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Union City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Union City, September typically has an average temperature of 24°C (75°F), with highs reaching up to 36°C (96°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec465257627177807975665349
Data source: Temperature data for Union 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 Union City

In Union City in September, the precipitation amount is 111 mm (4.4 in) spread over 8 days.

September Precipitation Trends in Union City

The chart displays monthly precipitation patterns in Union 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 Union City, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1011341171169111511113711111379136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Union City

In Union City in September, humidity is 82%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making travel feel sticky and heavy on the skin, often requiring more frequent breaks and hydration.

September Average Humidity in Union City

This chart illustrates the average monthly humidity levels in Union 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 Union City is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%81%81%81%83%81%82%78%86%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Union City

In Union 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 Union City.

Maximum UV Index Levels in Union City for September

The chart shows the monthly maximum UV Index (UVI) for Union 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 Union City typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47811111111109864
Data source: Union 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 Union City Compares to Other Months

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

This table compares monthly weather conditions in Union City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)101 mm (4.0 inches)86%moderate
February Weather11°C (52°F)134 mm (5.3 inches)84%high
March Weather14°C (57°F)117 mm (4.6 inches)83%very high
April Weather17°C (63°F)116 mm (4.6 inches)81%extreme
May Weather22°C (71°F)90 mm (3.6 inches)81%extreme
June Weather25°C (77°F)115 mm (4.5 inches)81%extreme
July Weather26°C (80°F)111 mm (4.4 inches)83%extreme
August Weather26°C (79°F)137 mm (5.4 inches)81%very high
September Weather24°C (75°F)111 mm (4.4 inches)82%very high
October Weather19°C (67°F)113 mm (4.4 inches)78%very high
November Weather11°C (53°F)79 mm (3.1 inches)86%high
December Weather9°C (49°F)136 mm (5.3 inches)89%moderate

Compare Union City's Climate with Cities Worldwide