Maine (Portland)
September
Weather in Maine for September 2026
Your guide to Maine weather in September - trends and predictions
Until now, September 2026 in Maine has been nearly identical to the historical average, with a temperature of 21.5 °F (showing only a slight deviation of 0.4 °F).
The forecast for the upcoming days in Maine predicts a temperature of 15 °F, which is slightly above the historical average.
In general, the average temperature in Maine at the beginning of September is 21.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.4 °F by the end of September.
Maine experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 158.6 mm.
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Temperatures
Rain 🌧️
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23
Dry days
7
Rainy days
0
Snow days
19°/13°
Temperatures
16 km/h
Avg max wind
78 %
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 |  Light rain shower | 22° /15° | 2.6 mm | 4 | |
| Sept. 2 |  Partly cloudy | 19° /14° | 0 mm | 4 | |
| Sept. 3 |  Sunny | 19° /12° | 5.9 mm | 4 | |
| Sept. 4 |  Fog | 23° /14° | 0 mm | 5 | |
| Sept. 5 | Sunny | 22° /15° | 1.1 mm | 6 | |
| Sept. 6 | Mist | 22° /14° | 0.1 mm | 4 | |
| Sept. 7 | Mist | 22° /12° | 9.3 mm | 5 | |
| Sept. 8 | Sunny | 21° /12° | 0.8 mm | 4 | |
| Sept. 9 | Sunny | 20° /11° | 1.3 mm | 4 | |
| Sept. 10 | Partly cloudy | 23° /14° | 4.2 mm | 4 | |
| Sept. 11 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 12 | Partly cloudy | 22° /11° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 20° /14° | 2.8 mm | 4 | |
| Sept. 14 | Patchy rain possible | 20° /14° | 0 mm | 5 | |
| Sept. 15 |  Overcast | 20° /12° | 0 mm | 5 | |
| Sept. 16 | Sunny | 21° /13° | 0 mm | 4 | |
| Sept. 17 | Fog | 19° /13° | 7 mm | 4 | |
| Sept. 18 | Mist | 22° /13° | 0.6 mm | 5 | |
| Sept. 19 | Mist | 18° /12° | 0 mm | 5 | |
| Sept. 20 | Overcast | 15° /12° | 16 mm | 1.3 | |
| Sept. 21 | Overcast | 17° /12° | 0.7 mm | 5 | |
| Sept. 22 | Overcast | 13° /11° | 0 mm | 3.6 | |
| Sept. 23 | Sunny | 13° /10° | 0.1 mm | 5 | |
| Sept. 24 | Overcast | 14° /10° | 0 mm | 4.2 | |
| Sept. 25 | Overcast | 14° /12° | 9.2 mm | 3 | |
| Sept. 26 | Overcast | 18° /14° | 1.2 mm | 4 | |
| Sept. 27 | Overcast | 14° /9° | 0 mm | 4 | |
| Sept. 28 | Patchy rain possible | 13° /11° | 0.1 mm | 4 | |
| Sept. 29 | Sunny | 14° /10° | 0 mm | 4 | |
| Sept. 30 | Light rain shower | 14° /11° | 7.9 mm | 3 | |
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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 19° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Maine during September?
Significant rainfall exceeding 158.6 mm is expected in Maine during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Maine during September?
The average wind speed in Maine during September is 16 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 💧
Typically, Maine has 7 rainy days in September with a total of 158.6 mm of rainfall.
UV exposure in Maine during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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