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September Weather in Galena, United States

Last updated: June 24, 2025

In September, the average temperature in Galena, United States reaches a pleasant 24°C (75°F). However, temperatures can vary significantly, with a minimum of 7°C (44°F) and a maximum of 35°C (96°F). Expect about 84 mm (3.3 in) of precipitation spread over 6 days, contributing to an average humidity of 64%. Whether you're exploring the sights or enjoying the local cuisine, be prepared for a mix of warm days and refreshing showers!

September Temperature in Galena

In September in Galena, the average temperature is 24°C (75°F), with maximums reaching up to 35°C (96°F) and minimums dropping as low as 7°C (44°F). This range makes it a perfect time for travelers to enjoy a mix of warm days 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 24°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec373951576878817874604843
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 84 mm (3.3 in) accumulated over the course 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 84 mm (3.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec786813913320692102110841355650
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 average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor exploration both refreshing and a little sticky, perfect for leisurely strolls and shaded cafes but with a need for frequent water breaks.

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.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather3°C (37°F)78 mm (3.1 inches)81%moderate
February Weather4°C (39°F)68 mm (2.7 inches)78%high
March Weather11°C (51°F)139 mm (5.5 inches)76%high
April Weather14°C (58°F)133 mm (5.2 inches)78%very high
May Weather20°C (68°F)206 mm (8.1 inches)83%very high
June Weather25°C (78°F)92 mm (3.6 inches)83%extreme
July Weather27°C (81°F)102 mm (4.0 inches)78%extreme
August Weather26°C (79°F)110 mm (4.3 inches)68%very high
September Weather24°C (75°F)84 mm (3.3 inches)64%very high
October Weather16°C (60°F)135 mm (5.3 inches)70%high
November Weather9°C (48°F)56 mm (2.2 inches)83%moderate
December Weather6°C (43°F)49 mm (1.9 inches)87%moderate

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