Weather in Bar Harbor, Maine for September 2026
Until now, September 2026 in Bar Harbor has been nearly identical to the historical average, with a temperature of 21.2 °F (showing only a slight deviation of 0.1 °F).
The forecast for the next days in Bar Harbor predicts temperatures to be around 15 °F, close to the historical average.
In general, the average temperature in Bar Harbor at the beginning of September is 20.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.6 °F by the end of September.
Bar Harbor experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 129.1 mm.
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Bar Harbor Weather September
Temperatures trend during September in Bar Harbor
September weather in Bar Harbor day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 23° /13° | 2.8 mm | 6 | |
| Sept. 2 |  Overcast | 20° /11° | 0 mm | 5 | |
| Sept. 3 |  Sunny | 19° /11° | 104.1 mm | 3 | |
| Sept. 4 |  Cloudy | 20° /12° | 16.2 mm | 3 | |
| Sept. 5 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 6 |  Partly cloudy | 19° /12° | 0.7 mm | 5 | |
| Sept. 7 |  Patchy rain possible | 21° /11° | 11.2 mm | 5 | |
| Sept. 8 | Overcast | 22° /11° | 1.3 mm | 4 | |
| Sept. 9 | Sunny | 19° /9° | 0 mm | 4 | |
| Sept. 10 | Cloudy | 23° /12° | 7.5 mm | 5 | |
| Sept. 11 | Sunny | 23° /9° | 0 mm | 6 | |
| Sept. 12 | Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 20° /11° | 2.6 mm | 3 | |
| Sept. 14 | Partly cloudy | 22° /12° | 0 mm | 5 | |
| Sept. 15 | Sunny | 22° /9° | 0 mm | 6 | |
| Sept. 16 | Sunny | 21° /10° | 0 mm | 5 | |
| Sept. 17 | Overcast | 22° /11° | 1.7 mm | 4 | |
| Sept. 18 | Overcast | 21° /11° | 3.5 mm | 5 | |
| Sept. 19 | Overcast | 20° /10° | 0 mm | 5 | |
| Sept. 20 | Overcast | 15° /8° | 4.2 mm | 4 | |
| Sept. 21 | Sunny | 17° /7° | 2.8 mm | 5.1 | |
| Sept. 22 | Overcast | 15° /6° | 0 mm | 3.7 | |
| Sept. 23 | Sunny | 15° /6° | 0 mm | 4.8 | |
| Sept. 24 | Sunny | 18° /6° | 3.2 mm | 5 | |
| Sept. 25 | Light rain shower | 13° /9° | 26.7 mm | 3 | |
| Sept. 26 | Light rain shower | 13° /11° | 20.7 mm | 3 | |
| Sept. 27 | Patchy rain possible | 11° /10° | 1.4 mm | 3 | |
| Sept. 28 | Sunny | 17° /10° | 0 mm | 5 | |
| Sept. 29 | Overcast | 16° /10° | 0 mm | 4 | |
| Sept. 30 |  Mist | 14° /12° | 3.2 mm | 4 | |
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Bar Harbor in September - FAQ
What are the expected maximum and minimum temperatures in Bar Harbor during September?
How much rainfall should be expected in Bar Harbor during September?
What are the typical wind conditions in Bar Harbor during September?
September rainfall patterns in Bar Harbor
UV exposure in Bar Harbor during September
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Where is Bar Harbor?Get accurate weather forecasts for Bar Harbor, located at latitude 44.388 and longitude -68.204. Stay updated with localized weather information tailored for Bar Harbor.