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United States weather

Weather in Bar Harbor, Maine for September 2025

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

    Temperatures

  • Until now, September 2025 in Bar Harbor is slightly cooler than the historical average by -0.8 °F.

  • Expect cooler weather in the next days in Bar Harbor with the forecast suggesting a temperature of 19.3 °F, lower than the historical average.

  • In general, the average temperature in Bar Harbor at the beginning of September is 19.9 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 19.7 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Bar Harbor experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
26
Dry days
Average rainy days
4
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
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
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
Partly cloudy
21°
16
Partly cloudy
17°
17
Mist
17°
18
Cloudy
21°
19
Sunny
20°
20
Sunny
16°
21
Sunny
17°
22
Sunny
22°
23
Sunny
20°
24
Moderate rain
18°
25
Patchy rain possible
15°
26
Sunny
20°
27
Sunny
25°
28
Sunny
21°
29
Overcast
18°
30
Cloudy
21°

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 Partly cloudy
Partly cloudy
 21° /9° 0 mm 1.3
Sept. 16 Partly cloudy
Partly cloudy
 17° /7° 0 mm 1.3
Sept. 17 Mist
Mist
 17° /10° 0 mm 1.3
Sept. 18 Cloudy
Cloudy
 21° /11° 0 mm 1.2
Sept. 19 Sunny
Sunny
 20° /11° 0 mm 0.1
Sept. 20 Sunny
Sunny
 16° /7° 0 mm 4
Sept. 21 Sunny
Sunny
 17° /6° 0 mm 4
Sept. 22 Sunny
Sunny
 22° /10° 0 mm 5
Sept. 23 Sunny
Sunny
 20° /12° 0 mm 5
Sept. 24 Moderate rain
Moderate rain
 18° /13° 8.7 mm 3
Sept. 25 Patchy rain possible
Patchy rain possible
 15° /13° 3.4 mm 3
Sept. 26 Sunny
Sunny
 20° /12° 0 mm 4
Sept. 27 Sunny
Sunny
 25° /13° 0 mm 5
Sept. 28 Sunny
Sunny
 21° /12° 0 mm 5
Sept. 29 Overcast
Overcast
 18° /11° 0 mm 4
Sept. 30 Cloudy
Cloudy
 21° /13° 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?
Moderate rainfall is anticipated in Bar Harbor during September, with a total of 62 mm spread over approximately 4 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 ☀️

Quick links

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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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