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United States weather

Weather in Bar Harbor, Maine for September 2026

Your guide to Bar Harbor weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Bar Harbor at the beginning of September is 19.9 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 19.3 °C by the end of September.

    • Rain 🌧️

  • Bar Harbor experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 129.1 mm.

    • More

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Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/12°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Bar Harbor Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Moderate rain at times
23°
2
Partly cloudy
20°
3
Sunny
19°
4
Cloudy
19°
5
Sunny
20°
6
Partly cloudy
19°
7
Patchy rain possible
19°
8
Overcast
20°
9
Sunny
20°
10
Cloudy
20°
11
Sunny
23°
12
Partly cloudy
22°
13
Patchy rain possible
22°
14
Partly cloudy
22°
15
Sunny
23°
16
Sunny
21°
17
Overcast
22°
18
Overcast
20°
19
Overcast
22°
20
Overcast
18°
21
Cloudy
18°
22
Cloudy
17°
23
Patchy rain possible
20°
24
Cloudy
17°
25
Patchy rain possible
17°
26
Moderate or heavy rain shower
19°
27
Patchy rain possible
21°
28
Patchy rain possible
19°
29
Overcast
22°
30
Cloudy
20°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Moderate rain at times
Moderate rain at times
 23° /15° 4.2 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 20° /12° 0.1 mm 5
Sept. 3 Sunny
Sunny
 19° /10° 0 mm 5
Sept. 4 Cloudy
Cloudy
 19° /11° 0 mm 4
Sept. 5 Sunny
Sunny
 20° /13° 0 mm 5
Sept. 6 Partly cloudy
Partly cloudy
 19° /14° 0 mm 5
Sept. 7 Patchy rain possible
Patchy rain possible
 19° /12° 16.8 mm 5
Sept. 8 Overcast
Overcast
 20° /11° 1 mm 5
Sept. 9 Sunny
Sunny
 20° /11° 0 mm 6
Sept. 10 Cloudy
Cloudy
 20° /11° 0 mm 5
Sept. 11 Sunny
Sunny
 23° /7° 0 mm 6
Sept. 12 Partly cloudy
Partly cloudy
 22° /11° 0 mm 6
Sept. 13 Patchy rain possible
Patchy rain possible
 22° /11° 0.1 mm 5
Sept. 14 Partly cloudy
Partly cloudy
 22° /12° 0 mm 6
Sept. 15 Sunny
Sunny
 23° /11° 0 mm 6
Sept. 16 Sunny
Sunny
 21° /11° 0 mm 6
Sept. 17 Overcast
Overcast
 22° /10° 0 mm 5
Sept. 18 Overcast
Overcast
 20° /11° 0 mm 5
Sept. 19 Overcast
Overcast
 22° /12° 0 mm 5
Sept. 20 Overcast
Overcast
 18° /10° 0 mm 5
Sept. 21 Cloudy
Cloudy
 18° /10° 0 mm 5
Sept. 22 Cloudy
Cloudy
 17° /11° 0 mm 4
Sept. 23 Patchy rain possible
Patchy rain possible
 20° /13° 3 mm 5
Sept. 24 Cloudy
Cloudy
 17° /13° 0 mm 4
Sept. 25 Patchy rain possible
Patchy rain possible
 17° /11° 32.7 mm 4
Sept. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /13° 64.8 mm 4
Sept. 27 Patchy rain possible
Patchy rain possible
 21° /13° 6.3 mm 6
Sept. 28 Patchy rain possible
Patchy rain possible
 19° /11° 0.1 mm 4
Sept. 29 Overcast
Overcast
 22° /12° 0 mm 6
Sept. 30 Cloudy
Cloudy
 20° /12° 0 mm 5
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 12°. 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 129.1 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 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 💧
Typically, Bar Harbor has 7 rainy days in September with a total of 129.1 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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Location coordinates 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.

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