Minnesota Weather In September: What To Expect

Oct 23, 2025 by Jhon Lennon 47 views

September in Minnesota marks a transition from the warmth of summer to the cooler temperatures of autumn. For those planning a visit or simply curious about the typical weather conditions, understanding what to expect can greatly enhance your experience. Let's dive into the details of Minnesota's September weather, covering everything from temperatures and precipitation to daylight hours and tips for enjoying the season.

Temperature Averages in Minnesota in September

When considering Minnesota weather in September, temperature is a crucial factor. Generally, you'll notice a significant drop from the heat of July and August. The average high temperatures across the state range from the mid-60s to low 70s Fahrenheit (around 18-23 degrees Celsius). However, keep in mind that these are just averages. Early September might still bring a few days reminiscent of summer, with temperatures climbing into the 80s Fahrenheit (26-30 degrees Celsius). Conversely, as the month progresses, you'll feel a definite chill in the air, especially during the evenings.

Nights in September can be quite cool, with average low temperatures dipping into the 40s and 50s Fahrenheit (4-15 degrees Celsius). This means that packing layers is essential if you plan to be out and about after sunset. Areas in northern Minnesota tend to experience cooler temperatures compared to the southern part of the state. For example, cities like International Falls or Bemidji will likely have lower average temperatures than Minneapolis or Rochester.

It's also worth noting that temperature variations can occur from year to year. Some Septembers might be unusually warm, extending the summer-like conditions, while others might bring an early taste of winter. Checking the local weather forecast closer to your travel dates is always a good idea. Websites like the National Weather Service or AccuWeather provide detailed forecasts that can help you prepare.

Moreover, microclimates within Minnesota can influence local temperatures. Proximity to large bodies of water, such as Lake Superior, can moderate temperatures, keeping coastal areas slightly warmer in the fall. Similarly, urban areas tend to retain more heat compared to rural areas, leading to slightly higher temperatures in cities.

Precipitation and Humidity in September

Beyond temperature, precipitation is another key element of Minnesota weather in September. Rainfall is common, although typically less frequent than in the summer months. On average, Minnesota receives around 3 to 4 inches (75-100 mm) of rain in September. This precipitation is usually spread out over several days, rather than occurring in heavy downpours.

The humidity also begins to decrease in September, making the weather feel more comfortable compared to the muggy days of July and August. Lower humidity levels mean that even when temperatures are moderate, the air feels crisper and more refreshing. This can make outdoor activities more enjoyable, as you're less likely to feel sticky or overheated.

However, it's essential to be prepared for rain. Carrying a light jacket or umbrella is advisable, especially if you plan to spend time outdoors. While September is not typically a month for severe weather, it's always wise to stay informed about the local weather forecast. Occasional thunderstorms can occur, although they are less frequent than in the summer.

The type of precipitation can also vary as the month progresses. Early in September, rain is the most common form of precipitation. But as temperatures drop towards the end of the month, there's a slight chance of seeing the first snowflakes of the season, particularly in northern Minnesota. While significant snowfall is rare in September, a dusting of snow is not entirely out of the question.

Additionally, morning dew is common due to the cooler overnight temperatures. This can make grassy areas damp, so wearing appropriate footwear is a good idea if you plan to go for a walk or hike in the early morning.

Daylight Hours in Minnesota in September

Daylight hours are another significant aspect of Minnesota weather in September. As the month progresses, you'll notice a gradual decrease in the amount of daylight each day. September marks the transition towards shorter days and longer nights, a characteristic of autumn.

At the beginning of September, Minnesota enjoys around 13 hours of daylight. By the end of the month, this has decreased to approximately 11.5 hours. This reduction in daylight hours can impact outdoor activities, especially in the evening. Planning your day accordingly is essential to make the most of the available daylight.

The decreasing daylight also affects the landscape. As the days shorten, trees begin to prepare for winter, triggering the vibrant fall foliage that Minnesota is famous for. September is a prime time for leaf-peeping, as the forests transform into a tapestry of red, orange, and gold.

Photographers and nature enthusiasts often appreciate the soft, golden light that characterizes September days. The angle of the sun is lower, creating long shadows and warm hues that enhance the beauty of the natural surroundings. This makes it an ideal time for capturing stunning landscapes and outdoor portraits.

Furthermore, the reduced daylight hours can influence your body's natural rhythms. Some people may experience increased tiredness or changes in mood as the days shorten. Ensuring you get enough sleep and exposure to natural light during the day can help mitigate these effects.

Activities to Enjoy in Minnesota in September

Despite the changing weather, September is a fantastic time to enjoy a wide range of activities in Minnesota. The cooler temperatures and vibrant fall colors create a picturesque backdrop for outdoor adventures.

Hiking and Biking: With comfortable temperatures and stunning scenery, September is perfect for hiking and biking. Trails throughout the state offer opportunities to explore forests, lakes, and parks. Popular destinations include the North Shore of Lake Superior, Itasca State Park, and the many regional and local parks.
Leaf Peeping: As mentioned earlier, September is prime time for viewing the fall foliage. Scenic drives along the state's highways and byways offer breathtaking views of the colorful landscapes. Consider visiting areas like the Mississippi River Valley or the Brainerd Lakes area for exceptional fall color displays.
Apple Picking: Many apple orchards across Minnesota open their doors in September, offering visitors the chance to pick their own apples. This is a fun and family-friendly activity that allows you to enjoy the fresh air and harvest the fruits of the season.
Festivals and Events: September is a month filled with festivals and events celebrating the harvest season. From county fairs to art festivals, there's always something happening in communities throughout the state. Check local event listings to find activities that interest you.
Fishing: Fishing remains a popular activity in September, as many species are active and biting. The cooler temperatures can make for more comfortable fishing conditions, and the fall colors add to the enjoyment of being on the water.
Camping: For those who enjoy the outdoors, September offers excellent camping opportunities. The cooler nights make for cozy campfires, and the lack of mosquitoes is a welcome relief compared to the summer months. Be sure to book your campsite in advance, as popular locations can fill up quickly.

Tips for Dressing and Packing for September in Minnesota

Dressing appropriately for Minnesota weather in September requires a bit of planning, as the temperatures can vary significantly throughout the day. Here are some tips to help you pack and dress for your visit:

Layers: The key to staying comfortable in September is to dress in layers. Start with a base layer of lightweight clothing, such as a t-shirt or long-sleeved shirt. Add a mid-layer, like a fleece jacket or sweater, and top it off with an outer layer, such as a waterproof jacket or windbreaker.
Long-Sleeved Shirts and Sweaters: Pack a variety of long-sleeved shirts and sweaters to accommodate different temperature ranges. These are essential for staying warm during cooler evenings and mornings.
Waterproof Jacket: A waterproof jacket is a must-have for September, as rain is common. Choose a lightweight jacket that can be easily packed away when not needed.
Comfortable Pants: Opt for comfortable pants, such as jeans or chinos, that can be worn for a variety of activities. Consider packing a pair of lightweight hiking pants if you plan to do a lot of outdoor exploring.
Closed-Toe Shoes: Closed-toe shoes are essential for September, as they will protect your feet from the cooler temperatures and any potential rain. Choose comfortable shoes that are suitable for walking and hiking.
Socks: Pack a variety of socks, including both lightweight and thicker socks, to accommodate different types of footwear and temperature conditions.
Hat and Gloves: While not always necessary, a hat and gloves can be useful for cooler evenings and mornings, especially if you plan to be outdoors for extended periods.
Sunglasses and Sunscreen: Even though the days are shorter, the sun can still be strong. Protect your skin and eyes by wearing sunglasses and sunscreen.

Conclusion

In conclusion, Minnesota weather in September is characterized by a transition from summer to autumn, with cooler temperatures, decreasing humidity, and vibrant fall colors. While rainfall is common, it is typically less frequent than in the summer months. Dressing in layers and being prepared for changing conditions are essential for enjoying all that Minnesota has to offer in September. Whether you're hiking through colorful forests, picking apples at a local orchard, or attending a fall festival, September in Minnesota is a time of beauty and adventure. So, pack your bags, embrace the changing season, and get ready to experience the magic of Minnesota in September!