Maine (Bar Harbor)
September
Weather in Maine for September 2025
Your guide to Maine weather in September - trends and predictions
Until now, September 2025 in Maine is slightly cooler than the historical average by -0.8 °F.
Expect cooler weather in the next days in Maine with the forecast suggesting a temperature of 19.3 °F, lower than the historical average.
In general, the average temperature in Maine at the beginning of September is 19.9 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 19.7 °F by the end of September.
With an average of 4 rainy days, Maine experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
20°/12°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
Maine Weather September
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What’s the Weather Like in Maine This September?
Discover the average temperatures and weather trends across Maine’s cities this September.
Temperatures trend during September in Maine
See the weather trend as well as the moving average line
September weather in Maine day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 23° /15° | 4.2 mm | 6 | |
| Sept. 2 |  Partly cloudy | 20° /12° | 0.1 mm | 5 | |
| Sept. 3 |  Sunny | 19° /10° | 0 mm | 5 | |
| Sept. 4 |  Cloudy | 19° /11° | 0 mm | 4 | |
| Sept. 5 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 6 | Partly cloudy | 19° /14° | 0 mm | 5 | |
| Sept. 7 |  Patchy rain possible | 19° /12° | 16.8 mm | 5 | |
| Sept. 8 |  Overcast | 20° /11° | 1 mm | 5 | |
| Sept. 9 | Sunny | 20° /11° | 0 mm | 6 | |
| Sept. 10 | Cloudy | 20° /11° | 0 mm | 5 | |
| Sept. 11 | Sunny | 23° /7° | 0 mm | 6 | |
| Sept. 12 | Partly cloudy | 22° /11° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 22° /11° | 0.1 mm | 5 | |
| Sept. 14 | Partly cloudy | 22° /12° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 21° /9° | 0 mm | 1.3 | |
| Sept. 16 | Partly cloudy | 17° /7° | 0 mm | 1.3 | |
| Sept. 17 |  Mist | 17° /10° | 0 mm | 1.3 | |
| Sept. 18 | Cloudy | 21° /11° | 0 mm | 1.2 | |
| Sept. 19 | Sunny | 20° /11° | 0 mm | 0.1 | |
| Sept. 20 | Sunny | 16° /7° | 0 mm | 4 | |
| Sept. 21 | Sunny | 17° /6° | 0 mm | 4 | |
| Sept. 22 | Sunny | 22° /10° | 0 mm | 5 | |
| Sept. 23 | Sunny | 20° /12° | 0 mm | 5 | |
| Sept. 24 |  Moderate rain | 18° /13° | 8.7 mm | 3 | |
| Sept. 25 | Patchy rain possible | 15° /13° | 3.4 mm | 3 | |
| Sept. 26 | Sunny | 20° /12° | 0 mm | 4 | |
| Sept. 27 | Sunny | 25° /13° | 0 mm | 5 | |
| Sept. 28 | Sunny | 21° /12° | 0 mm | 5 | |
| Sept. 29 | Overcast | 18° /11° | 0 mm | 4 | |
| Sept. 30 | Cloudy | 21° /13° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Maine in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Maine forecast closer to your planned date for the most up-to-date weather information.
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Maine in September - FAQ
What are the expected maximum and minimum temperatures in Maine during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Maine during September?
Moderate rainfall is anticipated in Maine during September, with a total of 62 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Maine during September?
The average wind speed in Maine during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Maine
Explore the daily rainfall trends and prepare for Maines September weather 💧
UV exposure in Maine during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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