Bar Harbor (ME)
September
Weather in Bar Harbor, Maine for September 2027
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 20.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 18.4 °C by the end of September.
Bar Harbor experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 253.8 mm.
Is September a good time to visit Bar Harbor? check out the best time to travel to Bar Harbor page.
✨ Is September a good time to visit Bar Harbor? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
20°/11°
Temperatures
16 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 |  Light rain | 23° /13° | 2.8 mm | 6 | |
| Sept. 2 |  Overcast | 20° /12° | 0 mm | 5 | |
| Sept. 3 |  Heavy rain | 18° /11° | 104.1 mm | 3 | |
| Sept. 4 |  Moderate rain | 20° /12° | 16.2 mm | 3 | |
| Sept. 5 |  Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 6 |  Partly cloudy | 19° /13° | 0.7 mm | 5 | |
| Sept. 7 | Moderate rain | 21° /11° | 11.2 mm | 5 | |
| Sept. 8 |  Patchy rain possible | 21° /11° | 1.3 mm | 4 | |
| Sept. 9 | Sunny | 19° /10° | 0 mm | 4 | |
| Sept. 10 | Light rain | 23° /13° | 7.5 mm | 5 | |
| Sept. 11 | Sunny | 23° /9° | 0 mm | 6 | |
| Sept. 12 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 13 | Light rain | 20° /11° | 2.6 mm | 3 | |
| Sept. 14 | Partly cloudy | 21° /12° | 0 mm | 5 | |
| Sept. 15 | Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 16 | Sunny | 20° /10° | 0 mm | 5 | |
| Sept. 17 | Patchy rain possible | 21° /11° | 1.7 mm | 4 | |
| Sept. 18 | Light rain | 21° /12° | 3.5 mm | 5 | |
| Sept. 19 | Overcast | 20° /11° | 0 mm | 5 | |
| Sept. 20 | Overcast | 17° /9° | 0.5 mm | 3 | |
| Sept. 21 |  Cloudy | 18° /9° | 0 mm | 4 | |
| Sept. 22 | Cloudy | 17° /10° | 0 mm | 4 | |
| Sept. 23 | Patchy rain possible | 19° /11° | 2 mm | 4 | |
| Sept. 24 | Cloudy | 17° /11° | 0 mm | 4 | |
| Sept. 25 | Moderate rain | 18° /11° | 21.8 mm | 3 | |
| Sept. 26 | Heavy rain | 19° /13° | 45.4 mm | 3 | |
| Sept. 27 | Light rain | 19° /13° | 5.8 mm | 4 | |
| Sept. 28 | Moderate rain | 17° /11° | 16.7 mm | 3 | |
| Sept. 29 | Moderate rain | 19° /12° | 10.1 mm | 4 | |
| Sept. 30 | Cloudy | 20° /12° | 0 mm | 4 | |
| Next | |||||
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 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bar Harbor during September?
Significant rainfall exceeding 253.8 mm is expected in Bar Harbor during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Bar Harbor during September?
The average wind speed in Bar Harbor during September is 16 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 💧
Typically, Bar Harbor has 7 rainy days in September with a total of 253.8 mm of rainfall.
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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