September weather forecast
Maine, USA

September in Maine ushers in the heart of fall, presenting a mesmerizing transformation in the landscape. Nights grow noticeably cooler, settling between the mid-40s°F to low 50s°F. Daytimes, while still basking in the remnants of summer warmth, range from the mid-60s°F to lower 70s°F, depending on the specific week and location.

Coastal regions such as Rockland and Kennebunkport, under the moderating influence of the Atlantic, enjoy milder temperatures, especially during the initial weeks of the month. Inland areas, places like Bangor and Presque Isle, experience a more pronounced variation in temperatures, with daytime warmth quickly giving way to cooler evenings.

September is synonymous with fall foliage in Maine, and this month sees the full spectrum of autumnal hues. Forests transform into vast canvases painted with shades of gold, crimson, and amber. This dramatic change in foliage, combined with the crisp air, makes outdoor activities such as hiking and apple picking especially delightful.

While the ocean water begins its descent into cooler temperatures, beaches still see visitors, though mostly for seaside walks and picnics rather than swimming. The declining warmth of the sun combined with the increasing cool breezes is a reminder of the imminent winter.

Rain in September is relatively moderate. While there might be occasional days of steady drizzle, they are interspersed with long stretches of clear, azure skies. These conditions often create an atmospheric contrast, with the bright autumn colors set against the backdrop of deep blue.

Transitioning to October, Maine continues its march into the deeper realms of fall. The temperatures continue to dip, and the colors reach their peak vibrancy, setting the stage for the state's most visually striking month.

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• Portland - September »
  September in Portland reveals a small adjustment in temperature, transitioning from an average high of a pleasant 72.3°F (22.4°C) in August to an enjoyable 66.4°F (19.1°C). In Portland snow does not fall in May through September.
• Lewiston - September »
  The month with the least rainfall in Lewiston is September, when the rain falls for 7.4 days and typically collects 0.67" (17mm) of precipitation. In Lewiston, in September, during 7.4 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.
• Bangor - September »
  In Bangor, in September, it is raining for 10.5 days, with typically 1.93" (49mm) of accumulated precipitation. In Bangor, in September, it is raining for 10.5 days, with typically 1.93" (49mm) of accumulated precipitation.
• South Portland - September »
  The month with the least rainfall in South Portland is September, when the rain falls for 10.2 days and typically collects 1.18" (30mm) of precipitation. The advent of September in South Portland, Maine, brings a subtle shift in temperature, with the average high moving from a pleasant 72.3°F (22.4°C) in August to an enjoyable 66.4°F (19.1°C).
• Auburn - September »
  In September, in Auburn, the rain falls for 7.4 days. September is the month with the least rainfall in Auburn, Maine.
• Biddeford - September »
  On the first day of September in Biddeford, sunrise is at 6:05 am and sunset at 7:18 pm. On the first day of September in Biddeford, sunrise is at 6:05 am and sunset at 7:18 pm.
• Sanford - September »
  In Sanford, Maine, in September, during 9.5 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. September is the month with the least rainfall in Sanford, Maine.
• Brunswick - September »
  The month with the least rainfall in Brunswick is September, when the rain falls for 8.9 days and typically collects 0.75" (19mm) of precipitation. Brunswick observes a small decrease in the average high-temperature with the arrival of September, falling from August's warm 73.4°F (23°C) to a refreshing 67.1°F (19.5°C).
• Scarborough - September »
  In Scarborough, in September, during 9.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. On the last day of September, in Scarborough, sunrise is at 6:37 am and sunset at 6:25 pm EDT.
• Saco - September »
  The month with the least rainfall in Saco is September, when the rain falls for 10.5 days and typically collects 1.34" (34mm) of precipitation. The month with the least rainfall in Saco is September, when the rain falls for 10.5 days and typically collects 1.34" (34mm) of precipitation.
• Augusta - September »
  In Augusta snow does not fall in June through September. On the first day of September in Augusta sunrise is at 6:01 am and sunset at 7:16 pm.
• Westbrook - September »
  The month with the least rainfall in Westbrook is September, when the rain falls for 9.5 days and typically collects 0.79" (20mm) of precipitation. On the first day of September in Westbrook, Maine, sunrise is at 6:05 am and sunset at 7:17 pm.