September Weather in Lake Michigan Beach, United States

Last updated: February 24, 2025

In September, Lake Michigan Beach experiences a delightful transition in weather, with average temperatures hovering around 20°C (67°F). The month can bring warm days, with maximums peaking at an inviting 32°C (90°F), while cooler evenings dip to a refreshing 6°C (43°F). Visitors may encounter occasional rain, totaling around 75 mm (3.0 in) over 9 days, contributing to the lush surroundings. Combined with a notable humidity level of 79%, this creates a unique coastal atmosphere, perfect for enjoying the scenic beauty and recreational activities that Lake Michigan has to offer.

September Temperature in Lake Michigan Beach

September at Lake Michigan Beach marks a delightful transition into autumn, showcasing milder temperatures that appeal to visitors seeking an outdoor escape. With minimums averaging around 6°C (43°F) and a pleasant average of 20°C (67°F), days are often warm and inviting. As the summer heat begins to wane, the maximum temperatures can still reach up to 32°C (90°F), offering a final taste of summer bliss before the cooler months set in. The gradual shift from the sweltering summer to the crisp fall air creates an ideal atmosphere for beachgoers and nature lovers alike, making it a picturesque time to enjoy the shores of Lake Michigan.

September Weather in Lake Michigan Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lake Michigan Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec282837465870757367554135
Data source: Temperature data for Lake Michigan Beach 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 Lake Michigan Beach

In September, Lake Michigan Beach experiences a modest precipitation total of 75 mm (3.0 in), marking a subtle decrease from the more abundant summer months and aligning closely with August's rainfall. With just 9 days of precipitation, September is one of the drier months, allowing for more sun-soaked days as summer begins to wane. This pattern sets the stage for a significant jump in rainfall in October, which often sees an increase in both precipitation amount and days, as seasonal shifts usher in cooler and wetter conditions. Overall, September serves as a transitional month, where the remnants of summer gradually blend into the early touches of autumn, both in weather and landscape.

September Precipitation Trends in Lake Michigan Beach

The chart displays monthly precipitation patterns in Lake Michigan Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec74737910215113310678751467267
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lake Michigan Beach

As September rolls in at Lake Michigan Beach, humidity levels settle at a comfortable 79%, marking a gradual decline from the high 87% of January through April. This slight dip reflects a transition towards the cooler autumn months, following the summer peak in July when humidity drops to its lowest at 78%. Interestingly, while September experiences higher humidity than the summer months, it remains consistent with August’s 79%. This data suggests that visitors can enjoy the early fall's refreshing breeze without the oppressive humidity that is typical of the earlier months, making it an ideal time for outdoor activities along the picturesque shore.

September Average Humidity in Lake Michigan Beach

This chart illustrates the average monthly humidity levels in Lake Michigan Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lake Michigan Beach

As summer transitions to fall, September at Lake Michigan Beach sees a noticeable dip in UV intensity. With a UV Index of 7, the exposure category shifts to high, requiring careful sun protection during outdoor activities, especially with a burn time of just 25 minutes. This month marks a gradual decrease from the peak summer values, while still signaling that the sun can be quite strong. Overall, visitors should remain vigilant even as the temperatures cool, as the effects of UV radiation linger. For detailed UV forecasts and more information, check out Lake Michigan Beach UV Index.

Maximum UV Index Levels in Lake Michigan Beach for September

The chart shows the monthly maximum UV Index (UVI) for Lake Michigan Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Lake Michigan Beach 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 Lake Michigan Beach

As summer gracefully transitions into autumn, September shines brightly in Lake Michigan Beach, boasting an impressive 290 hours of sunshine. This marks a delightful tapering from the peak 363 hours in July, reflecting the lingering warmth of summer while hinting at the cooler days ahead. The September sunshine provides a perfect backdrop for beachgoers, offering a vibrant atmosphere that showcases nature's beauty before the crisp fall air sets in. With sunshine hours gradually declining from August's 345 hours and continuing downward into October’s 215 hours, September serves as a charming bridge between the exuberance of summer and the serene embrace of autumn, inviting visitors to soak up the last rays of warmth.

Monthly Sunshine Duration in Lake Michigan Beach: September Highlighted

The September sunshine duration represents the total number of hours Lake Michigan Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec89h157h242h252h297h335h363h345h290h215h167h141h
Data source: Lake Michigan Beach September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Lake Michigan Beach During September

September marks a delightful turning point in Lake Michigan Beach, as the likelihood of sunny weather climbs to 56%, making it one of the sunniest months of the year. Following the gradual increase in sunshine throughout the summer, from a modest 38% in May to 47% in August, September's golden rays signal a perfect blend of warmth and outdoor enjoyment. This promising trend of increasing clear skies not only heightens the appeal of the beach but also invites locals and visitors alike to relish the beautiful transition into autumn, showcasing the best that this picturesque coastal gem has to offer. With increasingly favorable weather conditions, September presents an ideal opportunity for sun-seekers to bask in the beauty of Lake Michigan.

Percentage of Sunny Days in September in Lake Michigan Beach

The chart illustrates the percentage of sunny days in Lake Michigan Beach 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 Lake Michigan Beach experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec17%22%49%42%38%44%45%47%56%31%32%27%
Data source: Lake Michigan Beach September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Lake Michigan Beach in September

As September arrives at Lake Michigan Beach, the daylight duration begins to taper off, offering approximately 12 hours of sunlight—a gentle decline from the prolonged brightness of summer. This shift marks the transition from the peak of 15 hours in June to the softer glow of autumn, reminiscent of nature's cyclical rhythm. While the days grow shorter, this month still holds onto the warmth of summer, creating a perfect blend for outdoor activities and beach strolls. As the season progresses toward October, the lingering sunlight invites visitors to savor those precious hours before the daylight dwindles further, establishing a serene atmosphere that perfectly encapsulates the changing seasons.

Average Daylight Hours in Lake Michigan Beach for September

The chart illustrates the variation in daylight duration in Lake Michigan Beach throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 29m10h 34m11h 58m13h 23m14h 35m15h 11m14h 52m13h 47m12h 25m11h9h 46m9h 8m
Data source: Lake Michigan Beach daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Lake Michigan Beach

As summer wanes, September brings a refreshing change to Lake Michigan Beach, marked by an increase in average wind speed to 4.0 m/s (9 mph). This slight uptick from the calmest months of June and August, where winds dipped to 3.3 m/s (7 mph) and 2.8 m/s (6 mph), invigorates the shoreline with a brisk, invigorating breeze. Following the warm days of summer, the transition into autumn is accompanied by a sense of renewal as September’s winds prepare the landscape for the gustier months ahead, notably November and December, which can see speeds reaching up to 4.9 m/s (11 mph). The shift in wind patterns not only enhances the natural beauty of the beach but also beckons outdoor enthusiasts to embrace the changing season.

Average September Wind Speed in Lake Michigan Beach

The chart displays monthly wind speed patterns in Lake Michigan Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.84.14.33.73.63.33.32.84.0 m/s3.94.94.7
Data source: Lake Michigan Beach September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Lake Michigan Beach Compares to Other Months

The weather in Lake Michigan Beach 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 Lake Michigan Beach and find detailed weather information for every month.

September and January showcase stark contrasts in weather conditions. In September, temperatures range from a mild 6°C (43°F) at night to a warm 32°C (90°F) during the day, with an average of 20°C (67°F). This month experiences significant humidity at 79% and sees about 75 mm (3.0 in) of precipitation over 9 days. Conversely, January plunges into the cold, with temperatures dipping as low as -25°C (-12°F) and averaging around -2°C (28°F), reaching a maximum of 13°C (55°F). Though January has a similar total precipitation of 74 mm (2.9 in), it encounters more rainy days—13 in total—paired with a higher humidity level of 87%. For a closer look at what to expect, you can explore Lake Michigan Beach weather in January.

September and February present strikingly contrasting weather conditions. In September, temperatures range from a mild 6°C (43°F) at night to a warm 32°C (90°F) during the day, with an average of 20°C (67°F). This month sees a decent amount of rainfall, measuring 75 mm (3.0 in) over 9 days, and boasts a humidity level of 79%. In stark contrast, February is characterized by much colder temperatures, with a minimum of -20°C (-4°F) and a maximum reaching only 16°C (61°F), averaging around -2°C (29°F). Although February has a similar total precipitation of 73 mm (2.9 in), it falls over more days, totaling 13, and features higher humidity at 87%. For a detailed look at the specific conditions during this winter month, check out the Lake Michigan Beach weather in February.

September experiences a more moderate climate, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 32°C (90°F) and an average of 20°C (67°F). It typically sees about 75 mm (3.0 in) of precipitation over approximately 9 days, with humidity levels around 79%. In contrast, March presents a significantly colder atmosphere, with temperatures ranging from a frigid minimum of -14°C (7°F) to a milder maximum of 20°C (68°F), averaging just 3°C (37°F). This month tends to have slightly higher precipitation at 79 mm (3.1 in) over 12 days and greater humidity at 86%. For more specific details about March conditions, you can check Lake Michigan Beach weather in March.

When comparing the weather in September and April, distinct differences emerge. September features a comfortable average temperature of 20°C (67°F) with highs reaching up to 32°C (90°F), while April's averages settle around a cooler 8°C (46°F) and maximums of 26°C (78°F). Precipitation is more frequent in April, with rain occurring on about 14 days, compared to just 9 days in September, resulting in 102 mm (4.0 in) of rain versus September's 75 mm (3.0 in). Additionally, humidity levels are slightly higher in April at 87%, compared to September's 79%. For more specifics on April weather, you can check Lake Michigan Beach weather in April.

When comparing the weather in September and May, several notable differences emerge. September tends to be warmer overall, with average temperatures around 20°C (67°F) and a maximum of 32°C (90°F), while May sees cooler averages of 14°C (58°F) and peaks at 33°C (91°F). However, May experiences more precipitation, totaling 151 mm (5.9 in) over 14 days compared to September's 75 mm (3.0 in) across 9 days. Humidity is slightly higher in May at 82%, compared to September's 79%. For those interested in what May has to offer, you can learn more about Lake Michigan Beach weather in May.

When comparing the weather in September to that of June, we can see some notable differences. September experiences a wider temperature range with minimums dipping to 6°C (43°F) and maximums reaching 32°C (90°F), while June sees a slightly narrower range with minimums around 10°C (51°F) and maximums peaking at 31°C (89°F). In terms of precipitation, June is quite a bit wetter, averaging 133 mm (5.3 in) over 12 days compared to September's 75 mm (3.0 in) over 9 days. Humidity levels remain similar, with September at 79% and June at 81%. For a more detailed look at June conditions, you can check Lake Michigan Beach weather in June.

When comparing the weather in September and July, notable differences emerge. September features a wider temperature range, with minimums plummeting to 6°C (43°F) but averaging 20°C (67°F) during the day, while July maintains a milder minimum temperature of 16°C (60°F) and an average of 24°C (75°F). Both months experience maximum temperatures peaking at 32°C (90°F). However, September brings less precipitation, totaling 75 mm (3.0 in) over 9 days, in contrast to July's 106 mm (4.2 in) across 12 days. Humidity levels remain similar, at 79% in September and slightly lower at 78% in July. For a detailed look at July conditions, you can check Lake Michigan Beach weather in July.

In comparing the weather patterns of September and August, September showcases a broader temperature range, with minimums dropping to 6°C (43°F) and maximums reaching as high as 32°C (90°F), compared to August's milder minimum of 12°C (53°F) and a maximum of 31°C (89°F). While September's average temperature is slightly lower at 20°C (67°F), its precipitation level remains close to that of August, with 75 mm (3.0 in) over 9 days compared to August's 78 mm (3.1 in) across 11 days. Both months maintain a consistent humidity of 79%, indicating a similarly humid atmosphere. For specific conditions in August, you can refer to Lake Michigan Beach weather in August.

September and October exhibit notable differences in weather patterns. September offers a wide temperature range, with a minimum of 6°C (43°F) and maximum of 32°C (90°F), and an average of 20°C (67°F), making it generally warmer and conducive for outdoor activities. However, October sees a decrease in average temperatures, dropping to a minimum of 2°C (36°F) and an average of 13°C (56°F), with a maximum of 28°C (82°F). Additionally, October experiences significantly higher precipitation, totaling 146 mm (5.7 in) over 16 days, compared to September’s 75 mm (3.0 in) over 9 days. Humidity also rises slightly, enhancing the chill in the air. For those interested in what to expect in October, Lake Michigan Beach weather in October offers more detailed insights.

September and November present a stark contrast in weather patterns. In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 32°C (90°F), with an average of 20°C (67°F). The month witnesses about 75 mm (3.0 in) of precipitation over 9 days, combined with a humidity level of 79%. In contrast, November experiences much colder temperatures, with a minimum dipping to -8°C (17°F) and an average of only 5°C (42°F), while the maximum reaches 22°C (72°F). Although precipitation is slightly lower at 72 mm (2.8 in), it occurs over a greater number of days—12 in total—and humidity rises to 87%. For a closer look at November conditions, you can explore Lake Michigan Beach weather in November.

In September, the weather is characterized by warm temperatures, with averages around 20°C (67°F) and a maximum of 32°C (90°F), making it a great time for outdoor activities. In contrast, December brings a significant drop in temperature, averaging just 2°C (35°F) and plummeting to a minimum of -17°C (1°F). While September typically experiences 75 mm (3.0 in) of precipitation over 9 days, December follows closely with 67 mm (2.6 in) over 11 days, and a higher humidity of 86%. This dramatic shift highlights the stark seasonal changes experienced in this region. For more details about the weather during this month, you can check out Lake Michigan Beach weather in December.

Compare Lake Michigan Beach's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Lake Michigan Beach

As summer's warmth begins to wane in September, Lake Michigan Beach experiences a delightful transition, with temperatures ranging from pleasantly mild to comfortably warm. This month stands out with notably higher humidity, creating a lush atmosphere perfect for outdoor activities, even as occasional rainfall brings some refreshing breaks. Unlike the scorching peaks of summer or the crisp chill of fall, September offers a unique blend of seasonal charm, inviting visitors to enjoy the serene beauty of the beach before autumn fully sets in. For a deeper dive into what to expect throughout the year, check out the detailed insights on Lake Michigan Beach Climate.