September Weather in Galena, United States

Last updated: February 24, 2025

In September, Galena, United States, experiences a dynamic climate marked by a maximum temperature of 33°C (91°F) and a comfortable average of 19°C (66°F). The month brings cooler evenings, with lows dropping to 3°C (38°F). Approximately 112 mm (4.4 in) of precipitation falls across 9 days, contributing to a humid environment with an average humidity of 74%. This blend of warmth and moisture sets the stage for a vibrant and lively autumn in this charming town.

September Temperature in Galena

As September rolls into Galena, the temperatures signal a gentle transition from summer's warmth to autumn's embrace. With minimums around 3°C (38°F) and an average temperature of 19°C (66°F), residents experience a refreshing chill in the air, while the maximum can still reach a pleasant 33°C (91°F). This month showcases a delightful balance, allowing for both warm afternoons and cooler evenings, making it ideal for outdoor activities and enjoying the changing foliage. As the month progresses, the hint of cooling temperatures suggests that winter is not far behind, yet September remains a vibrant time for exploration and appreciation of the stunning natural beauty of the region.

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.
JanFebMarAprMayJunJulAugSepOctNovDec222337476172757266523730
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 September, Galena experiences a noteworthy shift in precipitation patterns as it transitions into autumn. With an average rainfall of 112 mm (4.4 in), September marks a significant increase compared to the drier summer months, reflecting a lush landscape as nature prepares for the colder seasons. Rainfall occurs over approximately 9 days, indicating a balanced spread that nurtures the environment without overwhelming it. This uptick follows the wetter spring and summer months, where May peaks at 146 mm (5.8 in), showcasing a gradual decline in precipitation leading into the fall. Observing this trend, September serves as a pivotal month, bridging the gap between summer's warmth and the crispness of autumn, all while providing essential moisture for the region's ecosystems.

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.
JanFebMarAprMayJunJulAugSepOctNovDec5060658814613488951121154543
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Galena

As September arrives in Galena, United States, humidity levels begin to shift, settling at 74%. This marks a subtle decrease from the more humid summer months of July and August, which saw levels dip to 75% and 69%, respectively. The trend suggests a gradual transition into the fall, with humidity levels aligning closely with the spring months, where average values range from 83% to 85%. Interestingly, as the year progresses from September into the cooler months, humidity is poised to rise again, peaking in November at a robust 88%. Overall, September serves as a pivotal point, reflecting an evolving climate as Galena moves from the warmth of summer into the crispness of autumn.

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, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Galena

In September, Galena experiences a UV Index of 8, indicating a very high level of sun exposure. This marks a slight decrease from the peak summer months of June and July, which recorded the highest UV Index at 10. Despite this reduction, the potential for sunburn remains significant, with a recommended burn time of just 15 minutes for unprotected skin. As the days grow shorter and temperatures begin to cool, September still demands caution under the sun, reminding outdoor enthusiasts to stay protected. For more detailed insights, you can check the full information at Galena UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
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.

September Sunshine in Galena

As September unfolds in Galena, the days still bask in ample sunshine, boasting 273 hours of golden rays. This marks a gradual shift from the sun-soaked peak of summer in July, which enjoys a dazzling 361 hours. Throughout the summer months, the sun graces the region with abundant warmth, peaking in July before a slight descent in August. However, September embraces a vibrant transition, holding onto summer's essence while hinting at autumn's arrival. With daylight hours still notably high, residents and visitors alike can relish the lingering warmth and beautiful sunsets, all while the landscape begins to don its autumnal colors. As the year draws to a close, the sunshine hours gradually taper off, reminding us of the cyclical rhythms of nature and the fleeting warmth of the season.

Monthly Sunshine Duration in Galena: September Highlighted

The September sunshine duration represents the total number of hours Galena experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec133h194h234h241h264h328h361h333h273h214h198h189h
Data source: Galena September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Galena During September

As summer transitions into autumn, Galena experiences a notable increase in sunny days during September, boasting a 63% chance of sunshine. This month stands out as the sunniest time of the year, surpassing the averages seen in the preceding months of June and August. With the warm summer climate lingering, September offers a delightful blend of pleasant temperatures and ample sunshine, making it an ideal time for outdoor activities and enjoying the beautiful fall scenery. As the year progresses into October, the likelihood of sunny weather dips to 37%, highlighting September as a precious window of sunny optimism in Galena before the cooler, cloudier months begin to set in.

Percentage of Sunny Days in September in Galena

The chart illustrates the percentage of sunny days in Galena throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Galena experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec26%35%43%36%35%51%46%57%63%37%42%39%
Data source: Galena September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Galena in September

As September rolls into Galena, daylight begins its gentle decline, offering about 12 hours of sunlight—a notable decrease from the summer peak of 15 hours in June. This transition reflects the gradual shift from the vibrant warmth of summer to the crispness of autumn, setting the stage for the vibrant foliage and cooler temperatures that follow. After enjoying longer days in May and June, residents now embrace a slightly shorter daylight duration, which still provides ample time to relish the scenic outdoor beauty before winter approaches. The trend emphasizes a rhythmic ebb and flow of sunlight, encapsulating the natural cycle of the seasons in this charming Midwestern town.

Average Daylight Hours in Galena for September

The chart illustrates the variation in daylight duration in Galena throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 27m10h 33m11h 58m13h 24m14h 37m15h 14m14h 54m13h 48m12h 25m10h 59m9h 44m9h 5m
Data source: Galena daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Galena

As the warm embrace of summer fades, September in Galena brings a gentle uptick in wind speed to 3.2 m/s (7 mph), reminiscent of the refreshing breezes that lead us into autumn. This mild increase follows a notably calm summer with July and August averaging just 2.6 m/s (6 mph), highlighting the seasonal shift as temperatures cool and the air begins to stir. Interestingly, this moderate September wind sets the stage for a steady trend into the fall months, with speeds predicted to hold at 3.3 m/s (7 mph) in October and rise further to 3.9 m/s (9 mph) by November. Thus, while September may not be the windiest month of the year, it serves as a precursor to the invigorating gusts that the upcoming season promises.

Average September Wind Speed in Galena

The chart displays monthly wind speed patterns in Galena, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.13.33.93.73.52.92.62.63.2 m/s3.33.93.7
Data source: Galena September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Galena Compares to Other Months

The weather in Galena changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Galena and find detailed weather information for every month.

September and January showcase stark contrasts in weather. In September, temperatures span from a mild low of 3°C (38°F) to a warm high of 33°C (91°F), with an average of 19°C (66°F). The month experiences a moderate level of precipitation at 112 mm (4.4 in) over 9 days and a humidity of 74%. Conversely, January plunges into the depths of winter, with temperatures ranging from a frigid low of -32°C (-26°F) to a maximum of 10°C (50°F), averaging -6°C (22°F). Precipitation is lower at 50 mm (2.0 in) over 8 days, but the humidity is slightly higher at 84%. For a deeper understanding of the conditions in January, check out Galena weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures range from a mild low of 3°C (38°F) to a warm high of 33°C (91°F), with an average of 19°C (66°F). This month sees an average of 112 mm (4.4 in) of precipitation over about nine days, while humidity levels hover around 74%. By contrast, February offers a much colder experience, with temperatures dipping as low as -33°C (-27°F) and only reaching a maximum of 20°C (69°F), averaging -5°C (24°F). Precipitation is lighter in February, totaling 60 mm (2.4 in) across eight days, but the humidity rises to 85%. For more details on February weather, you can check Galena weather in February.

September and March present quite a contrast in weather patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 33°C (91°F), with an average of 19°C (66°F), creating a warm and pleasant atmosphere. The month experiences significant precipitation, totaling 112 mm (4.4 in) over about 9 days, and humidity levels around 74%. In comparison, March is much colder, with temperatures ranging from a frigid -24°C (-11°F) to a milder 23°C (73°F) and an average temperature of only 3°C (37°F). Nonetheless, it has moderate precipitation of 65 mm (2.5 in) over approximately 10 days, and humidity slightly higher at 84%. These contrasting months showcase the transition from the warmth of late summer to the chill of early spring. For more details, check out Galena weather in March.

When comparing the weather in September and April, significant differences emerge in temperature and humidity. September enjoys a warmer range, with minimum temperatures around 3°C (38°F) and maximums reaching up to 33°C (91°F), while April experiences cooler temperatures, with lows dipping to -8°C (18°F) and highs peaking at 27°C (80°F). Although September has a higher average temperature of 19°C (66°F), April's average of 8°C (47°F) is accompanied by increased humidity levels at 83%, compared to September's 74%. Additionally, September sees more precipitation in total but fewer rainy days, with 112 mm (4.4 in) over 9 days, compared to April's 88 mm (3.5 in) across 11 days. For more insights into what to expect, check out Galena weather in April.

September and May weather exhibit notable contrasts in temperature and precipitation patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 33°C (91°F), with an average of 19°C (66°F), while May sees temperatures dipping lower, with a minimum of -1°C (30°F) and a slightly higher maximum of 34°C (94°F). Precipitation is more frequent in May, occurring on 15 days with a total of 146 mm (5.8 in), compared to September's 112 mm (4.4 in) falling over 9 days. Both months experience high humidity levels, with May at 75% and September at 74%. For a detailed look at the weather in May, you can check out Galena weather in May.

When comparing the weather in September and June, there are notable differences in temperature and precipitation. September sees a wider temperature range, with minimums dropping to 3°C (38°F) and maximums reaching up to 33°C (91°F), while June starts at a higher minimum of 10°C (49°F) and peaks at 34°C (93°F). Both months experience significant rainfall, but September's precipitation is slightly lower at 112 mm (4.4 in) over 9 days compared to June’s 134 mm (5.3 in) over 11 days. Additionally, June has a higher humidity level at 79%, compared to 74% in September. For more specific details about June weather, visit Galena weather in June.

In comparing the weather of September and July, September experiences a broader temperature range, with minimums dropping to 3°C (38°F) and maximums reaching up to 33°C (91°F), while July presents a warmer profile with minimums of 13°C (56°F) and maximums peaking at 35°C (95°F). Although July has an average temperature of 24°C (76°F), September’s average of 19°C (66°F) reflects the gradual transition towards cooler autumn days. Precipitation is slightly higher in September at 112 mm (4.4 in), occurring over 9 days compared to July's 88 mm (3.4 in) spread over 12 days, contributing to a slightly more humid atmosphere in September at 74% compared to July's 75%. For a detailed look at July's conditions, you can check Galena weather in July.

September weather presents a cooler profile compared to August, with minimum temperatures dropping from 12°C (53°F) in August to just 3°C (38°F) in September. However, both months share similar maximum temperatures, peaking at 33°C (91°F). September experiences slightly more precipitation, totaling 112 mm (4.4 in) over 9 days, in contrast to August's 95 mm (3.7 in) over 10 days. Humidity also rises in September, averaging 74% compared to August's 69%. For a closer look at August's climate specifics, you can check out Galena weather in August.

September and October showcase a distinct transition in weather patterns. In September, temperatures range from a mild 3°C (38°F) at night to a warm 33°C (91°F) during the day, with an average of 19°C (66°F). The month sees about 112 mm (4.4 in) of rainfall over 9 days and a humidity level of 74%. Conversely, October experiences a cooler climate, with nighttime temperatures dipping to -4°C (24°F) and a daily average of 11°C (52°F). While the maximum temperature can still reach 30°C (86°F), the month records slightly more rainfall at 115 mm (4.5 in) over 11 days, coupled with increased humidity at 79%. For more detailed insights, you can check Galena weather in October.

September and November display striking contrasts in weather patterns. In September, temperatures range from a mild 19°C (66°F) on average, dipping to a low of 3°C (38°F) and peaking at a warm 33°C (91°F). This month also experiences significant rainfall, with 112 mm (4.4 in) spread over 9 days and a humidity level of 74%. In contrast, November brings colder conditions, with an average temperature plummeting to just 3°C (37°F), a minimum of -15°C (5°F), and a maximum of 22°C (72°F). Precipitation decreases dramatically to 45 mm (1.8 in) over 7 days, yet humidity rises to 88%. For a detailed look at weather conditions in November, you can refer to Galena weather in November.

In September, the weather is significantly warmer, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 33°C (91°F) and an average of 19°C (66°F). This month experiences considerable rainfall, totaling 112 mm (4.4 inches) over approximately 9 days, along with a humidity level of 74%. In contrast, December brings much colder temperatures, with a minimum of -21°C (-6°F) and a maximum of 20°C (68°F), averaging around -1°C (30°F). Precipitation is lower in December at 43 mm (1.7 inches) over about 6 days, and humidity rises to 82%. For more details on the December climate, you can check Galena weather in December.

Compare Galena's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Galena

As summer transitions to autumn, September in Galena offers a unique blend of warm days and cooler nights, providing a stark contrast to the hotter summer months. With an average temperature that teeters between warmth and coolness, this month is characterized by slightly elevated humidity levels, which can make the air feel more intense during the day. Additionally, September brings considerable rainfall, with around a week of precipitation that supports the vibrant fall foliage still to come. For those looking to understand the shifting climate as autumn approaches, this month serves as a beautiful bridge. To delve deeper into the weather patterns throughout the year, visit Galena Climate.