September Weather in Sturgeon Bay, United States

Last updated: February 24, 2025

In September, Sturgeon Bay experiences a delightful transition from summer to fall, characterized by a maximum temperature of 29°C (85°F) and an average of 17°C (63°F). With nighttime temperatures dipping to a refreshing 5°C (41°F), this month offers a variety of climate experiences. Visitors can expect 66 mm (2.6 in) of rain over approximately 10 days, contributing to the region's 78% humidity. Overall, September in Sturgeon Bay is a vibrant blend of warmth and refreshing coolness, making it an ideal time for outdoor activities and enjoying the stunning fall foliage.

September Temperature in Sturgeon Bay

September in Sturgeon Bay offers a delightful transition from the warmth of summer to the crispness of fall. With minimum temperatures averaging around 5°C (41°F) and reaching up to a pleasant 29°C (85°F), the month showcases a comfortable average of 17°C (63°F), inviting residents and visitors alike to enjoy outdoor activities. Unlike the preceding months of sweltering heat in July and August, September brings a refreshing coolness, making it ideal for exploring the scenic beauty of the area. As the fleeting warmth lingers, the gradual drop in temperatures signals the approach of autumn, setting the stage for vibrant foliage and cozy gatherings.

September Weather in Sturgeon Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sturgeon Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec222232405264717063513729
Data source: Temperature data for Sturgeon Bay 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 Sturgeon Bay

September in Sturgeon Bay typically sees 66 mm (2.6 in) of precipitation over 10 days, marking a noticeable dip from the summer months. As the region transitions into autumn, this reduction in rainfall complements the gradual cooling temperatures, creating a refreshing atmosphere. Following the wetter months of June and August, where precipitation peaked at 101 mm (4.0 in) and 96 mm (3.8 in) respectively, September's moderate rainfall signals a shift, aligning with a less humid climate. This month effectively bridges the lushness of summer with the crispness of fall, as the early hint of changing seasons begins to paint the landscape in vibrant hues.

September Precipitation Trends in Sturgeon Bay

The chart displays monthly precipitation patterns in Sturgeon Bay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4250589295101909666995356
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sturgeon Bay

In September, Sturgeon Bay experiences a notable rise in humidity, reaching 78%, after the drier summer months. This increase suggests a shift as the warm weather gives way to the crispness of autumn. The trend highlights a significant decrease from the summer peak, with July and August recording the lowest humidity levels at 74% and 73% respectively. As the year progresses into October, humidity levels are expected to climb further, reminiscent of the previous autumn's patterns, which often see moisture levels returning to 84%. Overall, September marks a transitional phase, bridging the dry warmth of summer with the wetter conditions that characterize the fall months.

September Average Humidity in Sturgeon Bay

This chart illustrates the average monthly humidity levels in Sturgeon Bay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sturgeon Bay

As summer transitions into fall in Sturgeon Bay, the UV Index shows a notable shift in September, dropping to 7, which falls into the high exposure category. This marks a change from the intense very high levels experienced in the peak months of May through August, where burn times were only 15 minutes. In September, residents and visitors can enjoy 25 minutes of sun exposure before risking a burn, reminding us that while the days are still warm, the sun's intensity is gradually reducing. As daylight wanes, it's important to stay informed about UV levels, especially with the changing seasons. For more details on UV levels throughout the year, check out the full report on Sturgeon Bay UV Index.

Maximum UV Index Levels in Sturgeon Bay for September

The chart shows the monthly maximum UV Index (UVI) for Sturgeon Bay 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Sturgeon Bay 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 Sturgeon Bay

As summer transitions into autumn, September in Sturgeon Bay remains a vibrant chapter of sunshine, boasting 278 hours of sunlight. This month experiences a notable reduction in daylight compared to the sun-drenched peak of July, which records a whopping 368 hours. Yet, September still shines brighter than the earlier months of the year, presenting a delightful blend of warmth and comfort as the days grow shorter. Following the warm embrace of August with 336 hours, September's light serves as a gentle reminder of summer's lingering presence, while paving the way for the cozy autumnal months ahead. The steady decline from late summer peaks reflects the natural rhythm of the seasons, inviting residents and visitors alike to savor the last glimmers of sunshine before the chill of October settles in.

Monthly Sunshine Duration in Sturgeon Bay: September Highlighted

The September sunshine duration represents the total number of hours Sturgeon Bay 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.
JanFebMarAprMayJunJulAugSepOctNovDec118h201h250h250h310h340h368h336h278h217h176h148h
Data source: Sturgeon Bay September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sturgeon Bay During September

September in Sturgeon Bay offers a promising 55% chance of sunny weather, marking a delightful transition as summer gradually gives way to autumn. This month continues the trend of increased sunshine, with percentages peaking in the warmer months—58% in July and 56% in August—before starting to dip again in October. As days begin to shorten, September remains a beautiful time to enjoy the lingering warmth and radiant skies, making it a wonderful opportunity for outdoor activities and scenic explorations. With the end of summer approaching, this month stands out as one last chance to bask in the sun before autumn sets in.

Percentage of Sunny Days in September in Sturgeon Bay

The chart illustrates the percentage of sunny days in Sturgeon Bay 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 Sturgeon Bay experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec24%31%46%39%45%49%58%56%55%37%43%26%
Data source: Sturgeon Bay September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sturgeon Bay in September

As summer transitions into fall, September in Sturgeon Bay experiences a gentle decline in daylight, with approximately 12 hours of sunshine to enjoy. This month serves as a bridge between the long, bright days of summer—where sunlight peaked at 15 hours in June and July—and the shorter days that follow in October. While the daylight hours are still ample for outdoor activities, they begin to signal the onset of autumn, reminiscent of nature's shifting palette. The gradual decrease in sunlight from the 14 hours in May to 12 hours in September indicates a steady progression toward the cozier months ahead, inviting a reflective pause as the vibrant energy of summer fades.

Average Daylight Hours in Sturgeon Bay for September

The chart illustrates the variation in daylight duration in Sturgeon Bay throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 13m10h 26m11h 57m13h 31m14h 50m15h 30m15h 8m13h 57m12h 27m10h 54m9h 32m8h 50m
Data source: Sturgeon Bay daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Sturgeon Bay

In September, Sturgeon Bay experiences a gentle breeze with an average wind speed of 4.4 m/s (10 mph), marking a slight uptick from the summer months. This increase signals a transition as the region begins to prepare for the crispness of autumn. Compared to the quieter winds of July and August, where speeds dipped to 3.6 m/s (8 mph) and 3.7 m/s (8 mph) respectively, September's conditions bring a refreshing change. Interestingly, this month's winds are just below the spring averages, indicating a harmonious balance between the lingering warmth of summer and the impending chill of fall. As the leaves begin to change, the September winds serve as a reminder of the seasonal shift and the beauty that comes with it.

Average September Wind Speed in Sturgeon Bay

The chart displays monthly wind speed patterns in Sturgeon Bay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.85.24.34.34.13.63.74.4 m/s4.25.45.4
Data source: Sturgeon Bay September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Sturgeon Bay Compares to Other Months

The weather in Sturgeon Bay 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 Sturgeon Bay and find detailed weather information for every month.

Comparing the weather in September and January reveals stark contrasts. September boasts a mild average temperature of 17°C (63°F), with maximum highs reaching up to 29°C (85°F), making it a pleasant time for outdoor activities. Although September experiences more rainfall, with 66 mm (2.6 in) over about 10 days, the humidity levels hover around a comfortable 78%. In contrast, January presents a chilling environment, characterized by an average temperature of -5°C (23°F) and maximums that only hit 7°C (45°F). The precipitation is lower at 42 mm (1.6 in) over just 7 days, but the humidity is slightly higher at 89%, contributing to the icy conditions. For more specific insights into January's weather, you can check Sturgeon Bay weather in January.

September and February present starkly contrasting weather patterns. September boasts a mild climate with temperatures ranging from a cool 5°C (41°F) to a warm 29°C (85°F) and an average of 17°C (63°F). The month experiences relatively high humidity at 78% and receives 66 mm (2.6 in) of precipitation over 10 days. In contrast, February brings frigid temperatures, with a chilling minimum of -28°C (-18°F) and a maximum of just 12°C (54°F), averaging -5°C (22°F). This winter month is characterized by even higher humidity at 90%, yet it records slightly less precipitation at 50 mm (2.0 in) over the same 10 days. For more specific details about the weather during this cold month, visit Sturgeon Bay weather in February.

In September, the weather is notably warmer with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 29°C (85°F), and an average of 17°C (63°F). This month experiences relatively high humidity at 78% and receives about 66 mm (2.6 in) of precipitation over approximately 10 days. In contrast, March is much colder, featuring a temperature range from -21°C (-5°F) to a maximum of 13°C (56°F), with an average of 0°C (32°F). The month sees slightly lower precipitation levels at 58 mm (2.3 in) over 8 days, but the humidity is higher at 87%. For more detailed information about March weather, you can check Sturgeon Bay weather in March.

When comparing the weather in September and April, distinct differences emerge. In September, temperatures generally range from a minimum of 5°C (41°F) to a pleasant average of 17°C (63°F), peaking at a warm 29°C (85°F). In contrast, April is cooler, with temperatures starting as low as -9°C (15°F) and peaking at a maximum of 19°C (66°F), resulting in a much lower average temperature of 5°C (41°F). Additionally, April experiences more precipitation, with 92 mm (3.6 in) over 12 days, compared to September's 66 mm (2.6 in) over 10 days. Humidity levels are also slightly higher in April at 84% versus 78% in September. For more detailed information on weather patterns, you can explore Sturgeon Bay weather in April.

In September, temperatures range from a cool 5°C (41°F) to a warm 29°C (85°F), averaging around 17°C (63°F), while May experiences slightly cooler temperatures ranging from 0°C (32°F) to a maximum of 25°C (77°F), with an average of 11°C (53°F). September sees less precipitation with 66 mm (2.6 in) over approximately 10 days, compared to May's 95 mm (3.8 in) over 11 days. Humidity levels are quite similar in both months, with September at 78% and May slightly lower at 77%. For more details on May weather, check out Sturgeon Bay weather in May.

When comparing the weather in September and June, we see some notable differences despite their similar maximum temperatures of 29°C (85°F). September experiences a temperature range from a cooler minimum of 5°C (41°F) to an average of 17°C (63°F), while June's temperatures start slightly higher with a minimum of 7°C (45°F) and an average of 18°C (64°F). In terms of precipitation, June is wetter with 101 mm (4.0 in) falling over 12 days compared to September's 66 mm (2.6 in) over 10 days. Furthermore, September has a bit more humidity at 78% compared to June's 75%. For more detailed information, check out Sturgeon Bay weather in June.

September weather is generally cooler than July, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 29°C (85°F) and an average of 17°C (63°F). In contrast, July boasts warmer temperatures, starting at a minimum of 13°C (57°F), peaking at 31°C (89°F), and averaging 22°C (72°F). While September experiences around 66 mm (2.6 in) of precipitation over 10 days, July sees slightly more rain at 90 mm (3.6 in) across 11 days. Humidity in September is higher at 78%, compared to July's 74%. For a closer look at July's weather specifics, visit Sturgeon Bay weather in July.

When comparing the weather in September to August, we see a notable shift in temperatures and precipitation patterns. September experiences cooler temperatures, with a minimum of 5°C (41°F) and an average of 17°C (63°F), whereas August enjoys milder conditions with a minimum of 12°C (53°F) and an average of 21°C (70°F). Both months share the same maximum temperature of 29°C (85°F), but September tends to have higher humidity at 78% compared to August's 73%. In terms of rainfall, September has 66 mm (2.6 in) of precipitation over 10 days, which is slightly less than August's 96 mm (3.8 in) recorded over the same number of days. For a more detailed look, check out Sturgeon Bay weather in August.

September typically showcases warmer weather, with average temperatures around 17°C (63°F) and highs reaching up to 29°C (85°F). In contrast, October sees a significant drop in temperatures, averaging only 11°C (51°F) and peaking at 23°C (74°F). While September experiences about 66 mm (2.6 in) of precipitation over 10 days, October is wetter, with 99 mm (3.9 in) of rainfall across 12 days. The humidity levels also rise slightly from September's 78% to October's 84%, making the air feel a bit more damp. For more detailed insights, check out Sturgeon Bay weather in October.

September and November present a stark contrast in weather conditions. In September, temperatures range from a mild 5°C (41°F) at night to a warm 29°C (85°F) during the day, with an average of 17°C (63°F). This month experiences around 66 mm (2.6 in) of precipitation over approximately 10 days, coupled with a humidity level of 78%. In contrast, November sees much colder temperatures, with a minimum of -10°C (14°F), an average of 3°C (37°F), and a maximum of 19°C (67°F). The month has lower precipitation levels at 53 mm (2.1 in) over about 7 days, but a higher humidity of 89%. For more details on November weather, visit Sturgeon Bay weather in November.

September and December present stark contrasts in weather conditions. September boasts a milder climate with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 29°C (85°F), accompanied by an average of 17°C (63°F). This month experiences about 66 mm (2.6 in) of precipitation over 10 days, and humidity levels sit at 78%. In contrast, December brings frigid temperatures, with lows plummeting to -23°C (-9°F) and a maximum of only 15°C (59°F), averaging at -2°C (29°F). Precipitation in December is slightly lower at 56 mm (2.2 in) over 8 days, and humidity levels rise to 87%. For more details on December weather conditions, check out Sturgeon Bay weather in December.

Compare Sturgeon Bay's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Sturgeon Bay

September in Sturgeon Bay heralds the transition from summer warmth to the crispness of autumn, making it a unique month in the weather calendar. With temperatures often reaching pleasantly warm highs while also dipping noticeably at night, this month strikes a captivating balance. Unlike the peak summer months, September brings increased humidity and the potential for light rain, appearing on about a third of the days. The overall atmosphere shifts, inviting those who appreciate a mix of sun and cool breezes to enjoy the scenic beauty of the area. If you're keen to understand more about the weather patterns throughout the year, be sure to explore Sturgeon Bay Climate.