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September Weather in Galena, United States

Last updated: June 24, 2025

In September, the average temperature in Galena, United States is a warm 23°C (74°F). Expect a minimum of 8°C (46°F) and a pleasant maximum of 35°C (94°F). During this time, precipitation totals around 53 mm (2.1 in) over 6 days, with levels of average humidity reaching 64%. Plan accordingly to make the most of the mild and occasionally wet weather!

September Temperature in Galena

In September in Galena, the average temperature is 23°C (74°F). Maximums can reach 35°C (94°F), and minimums can be as low as 8°C (46°F). This varied climate makes Galena an ideal destination for travelers seeking both warmth and cooler evenings.

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

The chart illustrates September temperature patterns in Galena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Galena, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (94°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec363950566776797773594742
Data source: Temperature data for Galena 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 Galena

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

September Precipitation Trends in Galena

The chart displays monthly precipitation patterns in Galena, 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 Galena, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec86931451671718781125531426864
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Galena

In Galena in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Galena

This chart illustrates the average monthly humidity levels in Galena, 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 Galena is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Galena

In Galena 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 Galena.

Maximum UV Index Levels in Galena for September

The chart shows the monthly maximum UV Index (UVI) for Galena 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 Galena typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810101111109753
Data source: Galena 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 Galena Compares to Other Months

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

This table compares monthly weather conditions in Galena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)86 mm (3.4 inches)81%moderate
February Weather4°C (39°F)93 mm (3.6 inches)78%high
March Weather10°C (50°F)145 mm (5.7 inches)76%very high
April Weather13°C (56°F)167 mm (6.6 inches)78%very high
May Weather19°C (67°F)171 mm (6.7 inches)83%very high
June Weather24°C (76°F)87 mm (3.4 inches)83%extreme
July Weather26°C (80°F)81 mm (3.2 inches)78%extreme
August Weather25°C (77°F)125 mm (4.9 inches)68%very high
September Weather23°C (74°F)53 mm (2.1 inches)64%very high
October Weather15°C (60°F)142 mm (5.6 inches)70%high
November Weather8°C (47°F)68 mm (2.7 inches)83%moderate
December Weather6°C (43°F)64 mm (2.5 inches)87%moderate

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