September Weather in Harbor Springs, United States

Last updated: February 24, 2025

September in Harbor Springs, United States, offers a delightful transition into autumn with temperatures averaging around 17°C (62°F). Visitors can expect maximum daytime highs reaching 26°C (78°F), providing ample opportunity for outdoor activities, while cooler nights can dip to a refreshing 7°C (45°F). Although the month sees about 97 mm (3.8 in) of rainfall over 12 days, the moisture contributes to the vibrant fall foliage and lush landscapes. With an average humidity of 79%, the air feels crisp yet comfortable, making September an ideal time to explore the scenic beauty of this charming lakeside town.

September Temperature in Harbor Springs

As September arrives in Harbor Springs, the weather begins to transition into cooler autumn vibes. The temperatures exhibit a delightful shift, with minimums around 7°C (45°F) and averages rising to 17°C (62°F), making it a refreshing month for outdoor activities. Daytime highs can reach a pleasant 26°C (78°F), inviting visitors to enjoy the last remnants of summer. This pattern sees a gradual cooling from the warmer months of July and August, where the temperatures often hover around the mid-twenties. As nature prepares for the onset of fall, the crisp air and vibrant foliage enhance the charm of the area, making September a perfect time to explore the scenic beauty of Harbor Springs.

September Weather in Harbor Springs: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Harbor Springs, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec242330374758676862513830
Data source: Temperature data for Harbor Springs 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 Harbor Springs

In September, Harbor Springs experiences a moderate precipitation increase as summer transitions into fall. With 97 mm (3.8 in) of rain spread over 12 days, it marks a slight uptick from the drier months of July and August, which saw only 9 days of rainfall each. This uptick is indicative of the region's shifting weather patterns, as cooler temperatures begin to set in, paving the way for a wetter October ahead with an impressive 161 mm (6.4 in) looming. Overall, September serves as a bridge, with its rain nurturing the landscape in preparation for the vibrant autumn foliage, subtly hinting at the changes that the coming months will bring.

September Precipitation Trends in Harbor Springs

The chart displays monthly precipitation patterns in Harbor Springs, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6274629999998992971619993
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harbor Springs

As summer fades into autumn, September humidity in Harbor Springs begins to stabilize at 79%, reflecting a slight increase from the drier months of July and August. Throughout the year, humidity remains high, peaking in the winter months at 91%. The transition from summer's warmth brings a gradual rise from the relative lows earlier in the season; however, September's humidity is still notably lower than the winter averages, hinting at the refreshing yet crisp air of early fall. As the months progress towards October and November, humidity levels climb again, culminating in the moist conditions that characterize the winter season.

September Average Humidity in Harbor Springs

This chart illustrates the average monthly humidity levels in Harbor Springs, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%87%87%82%79%76%76%79%83%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harbor Springs

As summer fades into fall in Harbor Springs, United States, September brings a slight decrease in the UV Index, which stands at 7, indicating a high exposure category. This shift from the peak summer months, where the UV Index hovered around 9, means that while the risk of harm from unprotected sun exposure remains significant, the burn time increases to 25 minutes—a welcome change for those hoping to enjoy the last rays of summer. Overall, the UV Index trends reveal that as the year progresses, exposure levels fluctuate, dropping from a maximum in the summer to more moderate levels by October. For more detailed insights, visit Harbor Springs UV Index.

Maximum UV Index Levels in Harbor Springs for September

The chart shows the monthly maximum UV Index (UVI) for Harbor Springs 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.
JanFebMarAprMayJunJulAugSepOctNovDec245799987532
Data source: Harbor Springs 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 Harbor Springs

As September settles in Harbor Springs, the days start to shorten, yet the sun still shines brightly, offering 278 hours of sunlight—enough to witness the beauty of early autumn. Following the summer's peak in July, with an impressive 362 hours of golden rays, September reflects a gentle decline, marking the transition into fall. The month clings to the last remnants of summer warmth, notably higher than the winter months, which see a stark drop to just 80 hours in January. Overall, September strikes a perfect balance, showcasing the lingering joys of summer while whispering the approach of autumn, making it an ideal time to enjoy the stunning natural scenery of the region.

Monthly Sunshine Duration in Harbor Springs: September Highlighted

The September sunshine duration represents the total number of hours Harbor Springs 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.
JanFebMarAprMayJunJulAugSepOctNovDec80h133h227h239h306h333h362h334h278h193h120h97h
Data source: Harbor Springs September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Harbor Springs During September

September in Harbor Springs boasts a 52% chance of sunny weather, aligning it with the peak summer months of July and August. This trend suggests a delightful transition into autumn, where residents and visitors alike can still relish the warmth and brightness of late summer days. As the chance of sunshine begins to decline in October, September serves as a golden opportunity to enjoy outdoor activities against a backdrop of mild temperatures and vibrant fall foliage. With nearly half the month promising clear skies, it’s an ideal time for those looking to soak up the last rays of summer.

Percentage of Sunny Days in September in Harbor Springs

The chart illustrates the percentage of sunny days in Harbor Springs 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 Harbor Springs experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec9%18%39%36%50%44%54%52%52%34%29%15%
Data source: Harbor Springs September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Harbor Springs in September

As summer fades into autumn in Harbor Springs, September brings a gentle decline in daylight, offering approximately 12 hours of sunlit splendor each day. This marks a graceful transition from the longer days of summer, where sunlight extends up to 15 hours in June and July, to the more subdued daylight of autumn and winter. The gradual decrease in daylight hours, which began in August, sets the stage for the cozy, introspective seasons ahead. As nature prepares for its slumber, each day becomes an invitation to savor the beauty of the changing landscape bathed in the golden hues of early fall.

Average Daylight Hours in Harbor Springs for September

The chart illustrates the variation in daylight duration in Harbor Springs throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 9m10h 23m11h 57m13h 33m14h 54m15h 35m15h 13m14h12h 28m10h 52m9h 29m8h 45m
Data source: Harbor Springs daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Harbor Springs

As summer gives way to autumn, September in Harbor Springs brings a refreshing shift in the breeze, with an average wind speed of 5.0 m/s (11 mph). This marks a return to more robust winds after the gentle summer months, as August recorded modest conditions at 4.0 m/s (9 mph). The wind picks up again, reminiscent of early spring when the breezes also flirted around the 5.0 m/s mark. Notably, September’s winds signal a transitional phase, setting the stage for the brisk gusts of October and the invigorating chill of November, which often hovers around 6.2 m/s (14 mph) and climbs higher into December. This gentle increase serves as a reminder that autumn is here, inviting residents and visitors alike to embrace the crisp, invigorating air of the season.

Average September Wind Speed in Harbor Springs

The chart displays monthly wind speed patterns in Harbor Springs, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.15.65.95.04.44.13.84.05.0 m/s4.56.26.8
Data source: Harbor Springs September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Harbor Springs Compares to Other Months

The weather in Harbor Springs 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 Harbor Springs and find detailed weather information for every month.

September and January offer starkly contrasting weather conditions. In September, temperatures range from a cool 7°C (45°F) to a warm 26°C (78°F), with an average of 17°C (62°F). The month sees about 97 mm (3.8 in) of precipitation over 12 days and maintains a relative humidity of 79%. In contrast, January features much harsher cold, with temperatures dipping as low as -19°C (-2°F) and only reaching a max of 7°C (44°F); the average temperature hovers around -4°C (24°F). Although January has slightly less precipitation at 62 mm (2.5 in) over 13 days, the humidity level is higher at 91%, giving the month an even chillier feel. For more detailed information, you can check the Harbor Springs weather in January.

September and February present stark contrasts in weather. In September, temperatures range from a mild 7°C (45°F) at night to a pleasant 26°C (78°F) during the day, with an average temperature of 17°C (62°F). This month sees 97 mm (3.8 in) of precipitation spread over approximately 12 days, accompanied by a humidity level of 79%. In contrast, February brings frigid conditions with temperatures dipping as low as -17°C (2°F) and peaking at just 7°C (44°F), averaging -5°C (24°F). Although February experiences slightly less precipitation at 74 mm (2.9 in), it occurs over 16 days, leading to a higher humidity of 91%. For a more detailed look at February's weather, you can check out Harbor Springs weather in February.

September and March present contrasting weather patterns. In September, temperatures range from a mild 7°C (45°F) at night to a pleasant average of 17°C (62°F) during the day, peaking at 26°C (78°F). The month sees around 97 mm (3.8 in) of rainfall spread over 12 days, coupled with a humidity level of 79%. In striking contrast, March experiences much colder conditions, with nighttime temperatures plummeting to -15°C (5°F) and averaging just -1°C (30°F), while the maximum temperature reaches a modest 14°C (58°F). Precipitation is lighter at 62 mm (2.4 in), also over 12 days, and the humidity is slightly higher at 87%. For more details on March weather, visit Harbor Springs weather in March.

In comparing the weather of September and April, we see distinct differences in temperature and humidity. September enjoys milder temperatures, with a minimum of 7°C (45°F) and an average of 17°C (62°F), peaking at a comfortable 26°C (78°F). In contrast, April is significantly chillier, with temperatures dipping as low as -7°C (20°F) and averaging around 3°C (38°F), with a maximum of just 16°C (61°F). Precipitation levels in both months are similar, with September at 97 mm (3.8 in) and April slightly higher at 99 mm (3.9 in), occurring over approximately the same number of days. Notably, April exhibits a higher humidity level at 87% compared to September's 79%. For more details, you can check Harbor Springs weather in April.

In comparing the weather of September and May, both months exhibit a maximum temperature of around 26°C (78°F), but September generally enjoys a milder average temperature of 17°C (62°F), compared to May's cooler average of 8°C (47°F). While September experiences a minimum temperature of 7°C (45°F), May can dip to a chilly -2°C (29°F). Both months receive similar amounts of precipitation, with September averaging 97 mm (3.8 in) over 12 days and May slightly edging it out at 99 mm (3.9 in) over just 10 days. Humidity levels are quite high in both months, with September at 79% and May at 82%. For a closer look at May's weather conditions, you can visit Harbor Springs weather in May.

In comparing the weather of September and June, we can see some interesting similarities and differences. September boasts slightly warmer average temperatures, with a minimum of 7°C and a maximum of 26°C, while June has a lower average temperature that ranges from 5°C to 27°C. Both months experience similar levels of precipitation, with September recording 97 mm over 12 days and June slightly higher at 99 mm over 11 days. However, both months share the same humidity level of 79%. For a deeper dive into the specifics of June weather, you can visit Harbor Springs weather in June.

In comparing the weather of September to July, we see notable differences in temperature and humidity. September experiences cooler temperatures, with a minimum of 7°C (45°F) and an average of 17°C (62°F), while July boasts warmer conditions, with a minimum of 12°C (55°F) and an average of 20°C (67°F). Additionally, September is marked by higher precipitation, measuring 97 mm (3.8 in) over 12 days, compared to July's 89 mm (3.5 in) over just 9 days. Humidity levels are also slightly elevated in September at 79%, compared to 75% in July. For a closer look at July's weather specifics, visit Harbor Springs weather in July.

In comparing the weather of September and August, we see a notable shift in temperatures and conditions. September features a lower minimum temperature of 7°C (45°F) compared to August's minimum of 12°C (54°F), resulting in an average temperature of 17°C (62°F) for September, which is slightly cooler than August's average of 20°C (68°F). The maximum temperatures are relatively similar, with September reaching up to 26°C (78°F) and August peaking at 27°C (82°F). Precipitation levels increase slightly in September, with 97 mm (3.8 in) over 12 days, compared to August's 92 mm (3.6 in) which occurred over 9 days, while humidity also sees a small rise to 79% in September from 76% in August. For more detailed August weather data, you can check Harbor Springs weather in August.

September typically offers milder conditions with average temperatures ranging from 7°C (45°F) to a comfortable 26°C (78°F). However, as we transition into October, temperatures drop significantly, with minimums dipping to -1°C (30°F) and an average falling to 11°C (51°F). Additionally, October experiences increased precipitation, totaling 161 mm (6.4 in) over 18 days compared to September's 97 mm (3.8 in) across 12 days. This increase in rainfall and slightly higher humidity of 83% in October signal a shift towards cooler, wetter weather. For more details about October weather, you can visit Harbor Springs weather in October.

September and November present a stark contrast in weather patterns. In September, temperatures range from a minimum of 7°C (45°F) to a maximum of 26°C (78°F), with an average of 17°C (62°F). The month experiences about 97 mm (3.8 in) of precipitation over 12 days, along with a humidity level of 79%. In contrast, November brings cooler conditions, with temperatures dipping to a minimum of -10°C (15°F) and averaging just 3°C (38°F), while the maximum temperature reaches 19°C (67°F). Precipitation in November slightly increases to 99 mm (3.9 in), occurring over 18 days, and humidity rises to 86%. For a more detailed look at what to expect, you can check out Harbor Springs weather in November.

September weather in Harbor Springs is marked by milder conditions, with average temperatures ranging from a minimum of 7°C (45°F) to a warm maximum of 26°C (78°F). The month experiences around 97 mm (3.8 in) of precipitation over 12 days, accompanied by a humidity level of 79%. In contrast, December sees much colder temperatures, with averages hovering around -1°C (30°F) and a noticeable drop to a minimum of -16°C (3°F). Although precipitation remains similar at 93 mm (3.7 in), it occurs more frequently over 17 days, and the humidity rises slightly to 87%. For more detailed insights, you can check Harbor Springs weather in December.

Compare Harbor Springs's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Harbor Springs

As summer gently fades into autumn, September in Harbor Springs presents a delightful blend of warm days and cooler nights, making it stand out from the preceding summer months. The temperature averages a comfortable 17°C (62°F), with occasional peaks around 26°C (78°F), creating an inviting atmosphere for outdoor activities. However, the month also ushers in a noticeable increase in precipitation, with 12 rainy days contributing to the 97 mm (3.8 in) of rainfall, fostering a lush landscape as the leaves begin to change. Coupled with a higher humidity level at 79%, September signals a transitional phase, inviting locals and visitors alike to relish the beauty of the season. For a deeper explore into what to expect throughout the year, visit Harbor Springs Climate.