Bar Harbor (ME)
September
Weather in Bar Harbor, Maine for September 2025
Your guide to Bar Harbor weather in September - trends and predictions
In general, the average temperature in Bar Harbor at the beginning of September is 20.7 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.7 °F by the end of September.
With an average of 5 rainy days, Bar Harbor experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
20°/12°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
Bar Harbor Weather September
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Temperatures trend during September in Bar Harbor
See the weather trend as well as the moving average line
September weather in Bar Harbor day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 20° /16° | 8.4 mm | 5 | |
| Sept. 2 |  Partly cloudy | 20° /12° | 0.1 mm | 6 | |
| Sept. 3 |  Sunny | 19° /9° | 0 mm | 5 | |
| Sept. 4 |  Cloudy | 23° /11° | 0 mm | 5 | |
| Sept. 5 | Sunny | 23° /13° | 0 mm | 6 | |
| Sept. 6 | Partly cloudy | 19° /11° | 0 mm | 5 | |
| Sept. 7 |  Patchy rain possible | 21° /12° | 0.1 mm | 5 | |
| Sept. 8 |  Overcast | 18° /11° | 0 mm | 4 | |
| Sept. 9 | Sunny | 18° /10° | 0 mm | 5 | |
| Sept. 10 | Cloudy | 19° /11° | 0 mm | 4 | |
| Sept. 11 | Sunny | 21° /8° | 0 mm | 6 | |
| Sept. 12 | Partly cloudy | 23° /12° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 24° /12° | 0.2 mm | 5 | |
| Sept. 14 | Partly cloudy | 23° /12° | 0 mm | 6 | |
| Sept. 15 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 16 | Sunny | 22° /12° | 0 mm | 6 | |
| Sept. 17 | Overcast | 25° /12° | 0 mm | 6 | |
| Sept. 18 | Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 19 | Overcast | 23° /13° | 0 mm | 5 | |
| Sept. 20 | Overcast | 18° /14° | 0 mm | 4 | |
| Sept. 21 | Cloudy | 18° /14° | 0 mm | 4 | |
| Sept. 22 | Cloudy | 17° /13° | 0 mm | 4 | |
| Sept. 23 | Patchy rain possible | 17° /12° | 1 mm | 4 | |
| Sept. 24 | Cloudy | 17° /11° | 0 mm | 4 | |
| Sept. 25 | Patchy rain possible | 16° /11° | 0.3 mm | 4 | |
| Sept. 26 | Moderate or heavy rain shower | 13° /10° | 39 mm | 3 | |
| Sept. 27 | Patchy rain possible | 20° /13° | 12.6 mm | 5 | |
| Sept. 28 | Patchy rain possible | 19° /13° | 0.2 mm | 4 | |
| 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 Bar Harbor 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 Bar Harbor forecast closer to your planned date for the most up-to-date weather information.
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Bar Harbor in September - FAQ
What are the expected maximum and minimum temperatures in Bar Harbor 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 Bar Harbor during September?
Moderate rainfall is anticipated in Bar Harbor during September, with a total of 61.9 mm spread over approximately 5 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Bar Harbor during September?
The average wind speed in Bar Harbor during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Bar Harbor
Explore the daily rainfall trends and prepare for Bar Harbors September weather 💧
UV exposure in Bar Harbor during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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