September Weather in Minneapolis, United States

Last updated: February 24, 2025

September in Minneapolis offers a delightful transition into autumn, with daytime temperatures peaking at a warm 33°C (91°F), while evenings cool down to a refreshing 2°C (36°F). The average temperature for the month hovers around a comfortable 18°C (64°F), making it an ideal time for outdoor activities. However, be prepared for 115 mm (4.5 in) of rainfall over 10 days, as humidity levels remain relatively high at 81%. This combination of warmth and moisture creates a vibrant atmosphere, perfect for enjoying the rich tapestry of fall colors that begin to emerge.

September Temperature in Minneapolis

September in Minneapolis marks a significant shift towards the cooler autumn months, with temperatures beginning to reflect the transition away from summer heat. The average temperature settles at 18°C (64°F), showcasing a pleasant warmth during the day, while overnight lows typically dip to 2°C (36°F). This month also presents comfortable highs reaching up to 33°C (91°F), although the crispness in the air hints at the changing seasons. As the days grow shorter and the air turns fresher, September invites residents and visitors alike to enjoy the vibrant hues of fall in a city known for its stunning natural beauty.

September Weather in Minneapolis: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Minneapolis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec161733435971757164483323
Data source: Temperature data for Minneapolis 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 Minneapolis

In September, Minneapolis experiences a notable transition as summer fades into autumn. With 115 mm (4.5 in) of precipitation, it ranks among the wetter months of the year, although it slightly drops from August's peak of 135 mm (5.3 in). Rain graces the city on approximately 10 days, maintaining a balance that supports the lush fall foliage. This month’s precipitation marks a significant presence, sustaining the moisture levels experienced in the late summer while paving the way for the drier conditions that typically follow in October, which sees a decrease to 98 mm (3.9 in). As the air cools, the consistent rainfall in September plays a crucial role in preparing the landscape for the changing seasons.

September Precipitation Trends in Minneapolis

The chart displays monthly precipitation patterns in Minneapolis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2733568712686104136115983550
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Minneapolis

As summer transitions into fall, September in Minneapolis maintains a relative humidity level of 81%, mirroring the conditions of the preceding two months. This slight decrease from the wetter months of January through August reflects a gradual easing of moisture in the air, setting the stage for the crisp autumn days ahead. Despite the overall consistency, the humidity remains comfortably moderate, contributing to the city’s vibrant early fall atmosphere. Interestingly, October sees a slight uptick to 84%, hinting at the return of more humid conditions as the season progresses. Overall, September serves as a pivotal month where residents transition from the warmth of summer to the cooler embrace of autumn, all while enjoying a pleasant balance of humidity.

September Average Humidity in Minneapolis

This chart illustrates the average monthly humidity levels in Minneapolis, 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%90%85%84%78%80%81%81%81%84%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Minneapolis

As summer transitions into fall, September in Minneapolis sees a UV Index of 7, categorizing the sun exposure as high with a burn time of 25 minutes. This shift marks a decrease from the scorching heights reached in July and August, which both boasted a UV Index of 9, indicative of very high exposure levels. While the intensity of UV radiation begins to wane, it’s crucial to remain vigilant, as early autumn sunlight can still pose risks, particularly during midday hours. As you enjoy the crispness of September, don’t forget to check the daily UV levels to stay protected. For more detailed information, visit Minneapolis UV Index.

Maximum UV Index Levels in Minneapolis for September

The chart shows the monthly maximum UV Index (UVI) for Minneapolis 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
Data source: Minneapolis 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 Minneapolis

As summer fades, September brings a warm glow to Minneapolis, delivering 250 hours of sunshine—a delightful continuation of the sunny streak that began in June. This month stands as a vibrant transitional bridge, showcasing a significant drop from the summer peak of 360 hours in July yet still surpassing many earlier months. The evolving trend highlights how the days gradually shorten, but September’s abundant light often yields more pleasant outdoor experiences, allowing residents to savor the last remnants of warmer weather before the chill of autumn sets in. It's a time to bask in the lingering warmth, as the city transitions toward the cozy hues of October and beyond.

Monthly Sunshine Duration in Minneapolis: September Highlighted

The September sunshine duration represents the total number of hours Minneapolis 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.
JanFebMarAprMayJunJulAugSepOctNovDec138h202h235h236h287h347h360h319h250h213h176h169h
Data source: Minneapolis September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Minneapolis During September

As summer transitions into autumn, September in Minneapolis continues to boast an impressive 62% chance of sunny weather, matching the peak sunny days of August. This trend highlights a consistent trajectory of increasing sunshine as the seasons progress from the bleak mid-winter months, where chances of sun linger below 35%. With sunny weather on the rise, September offers a delightful opportunity for outdoor activities, taking advantage of the lingering warmth and clear skies before the chilly embrace of autumn settles in. The month stands out as one of the year's brightest, encouraging residents and visitors alike to savor the sunshine while it lasts.

Percentage of Sunny Days in September in Minneapolis

The chart illustrates the percentage of sunny days in Minneapolis 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 Minneapolis experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%33%45%31%41%58%57%62%62%46%39%30%
Data source: Minneapolis September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Minneapolis in September

As September arrives in Minneapolis, daylight begins to wane, reflecting the transition into fall. With 12 hours of daylight, the month presents a gentle decline from the sun-soaked heights of summer, where July and June basked in 15 hours of sunlight each day. This gradual reduction marks a shift from vibrant summer evenings to the coziness of autumn, as the days grow noticeably shorter. Following September, October further decreases daylight to 10 hours, starkly contrasting with the bustling brightness of May and June. This trend highlights nature's cyclical rhythm, where each month prepares the city for the coming changes of the colder seasons ahead.

Average Daylight Hours in Minneapolis for September

The chart illustrates the variation in daylight duration in Minneapolis throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 12m10h 25m11h 57m13h 31m14h 52m15h 32m15h 10m13h 58m12h 27m10h 54m9h 31m8h 48m
Data source: Minneapolis daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Minneapolis

As September arrives in Minneapolis, the average wind speed settles at 3.4 m/s (8 mph), reflecting a slight uptick from the more languid breezes of summer. This gentle increase, reminiscent of the transition into fall, showcases a shift in the air as it begins to cool. Throughout the year, the wind speed fluctuates, peaking in March and November at 3.9 m/s (9 mph), while July tends to be the calmest month with average gusts dipping to 2.7 m/s (6 mph). September's winds, however, are a herald of change, bridging the warmth of summer and the briskness of autumn, creating an inviting atmosphere for those ready to embrace the seasonal shift.

Average September Wind Speed in Minneapolis

The chart displays monthly wind speed patterns in Minneapolis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.03.23.93.53.43.12.73.23.4 m/s3.23.83.7
Data source: Minneapolis September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Minneapolis Compares to Other Months

The weather in Minneapolis 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 Minneapolis and find detailed weather information for every month.

September and January present strikingly different weather patterns. In September, temperatures can range from a cool 2°C (36°F) at night to a warm 33°C (91°F) during the day, with an average of 18°C (64°F). The month experiences a significant amount of precipitation, totaling 115 mm (4.5 in) over about 10 days, and a humidity level of 81%. In contrast, January is characterized by frigid cold, where temperatures can plummet to a minimum of -34°C (-28°F) and barely reach a maximum of 6°C (44°F), with an average of -9°C (17°F). Precipitation in January is much lower, at 27 mm (1.0 in) over just 5 days, while humidity rises slightly to 87%. For more details on January weather, visit Minneapolis weather in January.

September and February exhibit strikingly different weather patterns. In September, temperatures range from a chilly 2°C (36°F) at night to a warm 33°C (91°F) during the day, accompanied by a substantial 115 mm (4.5 in) of precipitation over about 10 days, and humidity levels averaging 81%. In contrast, February brings much harsher conditions, with frigid temperatures dipping as low as -35°C (-31°F) and an average of -8°C (17°F). This month sees significantly less precipitation at 33 mm (1.3 in) over just 6 days, but humidity remains high at 90%. For more detailed information, check out Minneapolis weather in February.

The weather in September is markedly warmer than in March, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 33°C (91°F), while March experiences much colder conditions with minimums dropping to -26°C (-14°F) and maximums reaching only 22°C (72°F). September also sees higher humidity levels at 81%, compared to March's 85%, though the latter's precipitation is lower at 56 mm (2.2 in) over fewer days (7) than September's 115 mm (4.5 in) over 10 days. For more detailed insights on March weather, you can check Minneapolis weather in March.

The weather in September is generally warmer compared to April, with average temperatures ranging from a minimum of 2°C (36°F) to a maximum of 33°C (91°F), while April sees cooler averages, with temperatures dipping as low as -14°C (8°F) and peaking at 28°C (83°F). September also experiences higher humidity at 81%, compared to April's 84%, which can make the warmth feel more intense in the fall month. Precipitation is slightly higher in September, totaling 115 mm (4.5 in) over around 10 days, while April sees 87 mm (3.4 in) of rain across 9 days. For more specific insights into April weather, you can visit Minneapolis weather in April.

In September, temperatures range from a cool 2°C (36°F) to a warm 33°C (91°F), with an average of 18°C (64°F). The month sees considerable precipitation, with about 115 mm (4.5 inches) falling over 10 days, and the humidity levels hover around 81%. In contrast, May boasts slightly warmer overall temperatures, with a minimum of 0°C (32°F) and a maximum reaching up to 36°C (97°F), averaging 15°C (59°F). Precipitation in May is a bit higher, totaling 126 mm (5.0 inches) across 12 days, and humidity is slightly lower at 78%. For more details on May weather, you can check out Minneapolis weather in May.

September and June present notable differences in weather patterns. In September, temperatures range from a cooler minimum of 2°C (36°F) to a maximum of 33°C (91°F), with an average of 18°C (64°F). This month also sees higher precipitation, totaling 115 mm (4.5 in) over approximately 10 days, coupled with a humidity level of 81%. In contrast, June offers warmer temperatures, with a minimum of 8°C (47°F) and a maximum of 36°C (97°F), averaging 22°C (72°F). Precipitation is less abundant in June, amounting to 86 mm (3.4 in) across the same number of days, and the humidity remains slightly lower at 80%. For more detailed information, visit Minneapolis weather in June.

When comparing the weather in September to July, notable differences in temperature and precipitation emerge. September features a wider temperature range, with minimums dropping to 2°C (36°F) and maximums reaching up to 33°C (91°F), while the average temperature is a comfortable 18°C (64°F). In contrast, July is consistently warmer, with minimum temperatures at 12°C (54°F), maximums peaking at 35°C (94°F), and an average of 24°C (75°F). Both months experience about 10 days of precipitation; however, September receives slightly more rain, totaling 115 mm (4.5 in) compared to July's 104 mm (4.1 in). Humidity remains constant in both months at 81%, contributing to a similar feel in the air. For more detailed information, check out Minneapolis weather in July.

In comparing the weather of September to that of August, we see notable differences in temperature and precipitation patterns. September experiences a wider range of temperatures, with a minimum of 2°C (36°F), an average of 18°C (64°F), and a maximum reaching 33°C (91°F). In contrast, August has milder minimum and average temperatures, ranging from 11°C (52°F) to 22°C (71°F), while also peaking at 32°C (91°F). Both months have high humidity levels at 81%, but September tends to have slightly less precipitation at 115 mm (4.5 in) over 10 days compared to August's 135 mm (5.3 in) over 12 days. For more detailed insights, check out Minneapolis weather in August.

The transition from September to October brings a noticeable shift in weather patterns. In September, temperatures range from a minimum of 2°C (36°F) to a comfortable average of 18°C (64°F), peaking at 33°C (91°F). However, by October, the temperatures drop significantly, with a minimum of -9°C (16°F) and an average of 9°C (49°F), reaching a maximum of 29°C (85°F). While September experiences more warmth and higher humidity at 81%, October sees a slight increase in humidity to 84% alongside slightly reduced precipitation of 98 mm (3.9 in) over 11 days, compared to September's 115 mm (4.5 in) over 10 days. For more detailed information, you can visit Minneapolis weather in October.

September and November present starkly contrasting weather conditions. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 33°C (91°F), with an average of 18°C (64°F), making it a warmer and more humid month with 81% humidity and 115 mm (4.5 in) of precipitation over approximately 10 days. In contrast, November sees a significant drop in temperature, with lows plunging to -16°C (4°F) and an average temperature of just 1°C (33°F), despite highs reaching a milder 24°C (75°F). November experiences less precipitation at 35 mm (1.4 in) over about 8 days and an increase in humidity to 88%. For more detailed insights, check out Minneapolis weather in November.

September weather in Minneapolis is characterized by a significant temperature range, with minimums around 2°C (36°F) and highs reaching up to 33°C (91°F), creating warm and often muggy days. The month experiences an average of 115 mm (4.5 in) of precipitation over approximately 10 days, indicating a relatively wet environment with a high humidity level of 81%. In contrast, December brings a stark transformation, with temperatures dropping dramatically to a minimum of -26°C (-15°F) and a chilly average of -5°C (23°F). Precipitation decreases to 50 mm (2.0 in) over about 7 days, while humidity remains slightly elevated at 84%. For more insight into the winter climate, you can check Minneapolis weather in December.

Compare Minneapolis's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Minneapolis

September in Minneapolis marks a transition into the crisp embrace of fall, with weather that feels notably different from the sweltering summer months. As temperatures start to dip, the average sits comfortably at a pleasant 18°C (64°F), but there are still days where you might experience a warm maximum of 33°C (91°F). This month also brings about a change in precipitation patterns, with about 10 days of rain contributing to a total of 115 mm (4.5 in) of moisture—providing essential water to the earth as it prepares for winter. The humidity lingers around a high 81%, creating an atmosphere that feels more lush and vibrant while signaling the end of the warmer season. For more detailed insights, explore the comprehensive climate trends at Minneapolis Climate.